diff --git a/packages/erc20-watcher/src/entity/Allowance.ts b/packages/erc20-watcher/src/entity/Allowance.ts
index 06bb510f..76d9e92b 100644
--- a/packages/erc20-watcher/src/entity/Allowance.ts
+++ b/packages/erc20-watcher/src/entity/Allowance.ts
@@ -3,6 +3,7 @@
 //
 
 import { Entity, PrimaryGeneratedColumn, Column, Index } from 'typeorm';
+import { bigintTransformer } from '@vulcanize/util';
 
 @Entity()
 @Index(['blockHash', 'blockNumber', 'token', 'owner', 'spender'], { unique: true })
@@ -25,7 +26,7 @@ export class Allowance {
   @Column('varchar', { length: 42 })
   spender!: string;
 
-  @Column('numeric')
+  @Column('numeric', { transformer: bigintTransformer })
   value!: bigint;
 
   @Column('text', { nullable: true })
diff --git a/packages/erc20-watcher/src/entity/Balance.ts b/packages/erc20-watcher/src/entity/Balance.ts
index 636329ff..5d8d8588 100644
--- a/packages/erc20-watcher/src/entity/Balance.ts
+++ b/packages/erc20-watcher/src/entity/Balance.ts
@@ -3,6 +3,7 @@
 //
 
 import { Entity, PrimaryGeneratedColumn, Column, Index } from 'typeorm';
+import { bigintTransformer } from '@vulcanize/util';
 
 @Entity()
 @Index(['blockHash', 'blockNumber', 'token', 'owner'], { unique: true })
@@ -22,7 +23,7 @@ export class Balance {
   @Column('varchar', { length: 42 })
   owner!: string;
 
-  @Column('numeric')
+  @Column('numeric', { transformer: bigintTransformer })
   value!: bigint;
 
   @Column('text', { nullable: true })
diff --git a/packages/uni-info-watcher/package.json b/packages/uni-info-watcher/package.json
index fab00960..a1abe19a 100644
--- a/packages/uni-info-watcher/package.json
+++ b/packages/uni-info-watcher/package.json
@@ -14,8 +14,8 @@
     "apollo-server-express": "^2.25.0",
     "apollo-type-bigint": "^0.1.3",
     "debug": "^4.3.1",
-    "decimal.js": "^10.3.1",
     "express": "^4.17.1",
+    "graphql": "^15.5.0",
     "graphql-import-node": "^0.0.4",
     "graphql-request": "^3.4.0",
     "json-bigint": "^1.0.0",
diff --git a/packages/uni-info-watcher/src/entity/Bundle.ts b/packages/uni-info-watcher/src/entity/Bundle.ts
index 6572acb4..073054cb 100644
--- a/packages/uni-info-watcher/src/entity/Bundle.ts
+++ b/packages/uni-info-watcher/src/entity/Bundle.ts
@@ -3,8 +3,7 @@
 //
 
 import { Entity, PrimaryColumn, Column } from 'typeorm';
-import Decimal from 'decimal.js';
-import { decimalTransformer } from '@vulcanize/util';
+import { graphDecimalTransformer, GraphDecimal } from '@vulcanize/util';
 
 @Entity()
 export class Bundle {
@@ -18,6 +17,6 @@ export class Bundle {
   @Column('integer')
   blockNumber!: number;
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  ethPriceUSD!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  ethPriceUSD!: GraphDecimal
 }
diff --git a/packages/uni-info-watcher/src/entity/Burn.ts b/packages/uni-info-watcher/src/entity/Burn.ts
index 6ce0d97e..3454418a 100644
--- a/packages/uni-info-watcher/src/entity/Burn.ts
+++ b/packages/uni-info-watcher/src/entity/Burn.ts
@@ -3,8 +3,7 @@
 //
 
 import { Entity, PrimaryColumn, Column, ManyToOne } from 'typeorm';
-import Decimal from 'decimal.js';
-import { decimalTransformer } from '@vulcanize/util';
+import { bigintTransformer, graphDecimalTransformer, GraphDecimal } from '@vulcanize/util';
 
 import { Transaction } from './Transaction';
 import { Pool } from './Pool';
@@ -25,8 +24,8 @@ export class Burn {
   @ManyToOne(() => Transaction, transaction => transaction.burns, { onDelete: 'CASCADE' })
   transaction!: Transaction
 
-  @Column('bigint')
-  timestamp!: BigInt;
+  @Column('numeric', { transformer: bigintTransformer })
+  timestamp!: bigint;
 
   @ManyToOne(() => Pool, { onDelete: 'CASCADE' })
   pool!: Pool
@@ -43,21 +42,21 @@ export class Burn {
   @Column('varchar', { length: 42 })
   origin!: string
 
-  @Column('bigint')
+  @Column('numeric', { transformer: bigintTransformer })
   amount!: bigint
 
-  @Column('numeric', { transformer: decimalTransformer })
-  amount0!: Decimal
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  amount0!: GraphDecimal
 
-  @Column('numeric', { transformer: decimalTransformer })
-  amount1!: Decimal
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  amount1!: GraphDecimal
 
-  @Column('numeric', { transformer: decimalTransformer })
-  amountUSD!: Decimal
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  amountUSD!: GraphDecimal
 
-  @Column('bigint')
+  @Column('numeric', { transformer: bigintTransformer })
   tickLower!: bigint
 
-  @Column('bigint')
+  @Column('numeric', { transformer: bigintTransformer })
   tickUpper!: bigint
 }
diff --git a/packages/uni-info-watcher/src/entity/Factory.ts b/packages/uni-info-watcher/src/entity/Factory.ts
index a4e62d7b..4c8cdd71 100644
--- a/packages/uni-info-watcher/src/entity/Factory.ts
+++ b/packages/uni-info-watcher/src/entity/Factory.ts
@@ -2,9 +2,8 @@
 // Copyright 2021 Vulcanize, Inc.
 //
 
-import Decimal from 'decimal.js';
 import { Entity, Column, PrimaryColumn } from 'typeorm';
-import { decimalTransformer } from '@vulcanize/util';
+import { graphDecimalTransformer, GraphDecimal, bigintTransformer } from '@vulcanize/util';
 
 @Entity()
 export class Factory {
@@ -18,32 +17,32 @@ export class Factory {
   @Column('integer')
   blockNumber!: number;
 
-  @Column('bigint', { default: BigInt(0) })
+  @Column('numeric', { default: BigInt(0), transformer: bigintTransformer })
   poolCount!: bigint;
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  totalValueLockedETH!: Decimal;
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  totalValueLockedETH!: GraphDecimal;
 
-  @Column('bigint', { default: BigInt(0) })
+  @Column('numeric', { default: BigInt(0), transformer: bigintTransformer })
   txCount!: bigint;
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  totalValueLockedUSD!: Decimal;
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  totalValueLockedUSD!: GraphDecimal;
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  totalVolumeUSD!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  totalVolumeUSD!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  totalVolumeETH!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  totalVolumeETH!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  totalFeesUSD!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  totalFeesUSD!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  totalFeesETH!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  totalFeesETH!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  untrackedVolumeUSD!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  untrackedVolumeUSD!: GraphDecimal
 
   // TODO: Add remaining fields when they are used.
 }
diff --git a/packages/uni-info-watcher/src/entity/Mint.ts b/packages/uni-info-watcher/src/entity/Mint.ts
index 70d39cb0..43edde87 100644
--- a/packages/uni-info-watcher/src/entity/Mint.ts
+++ b/packages/uni-info-watcher/src/entity/Mint.ts
@@ -3,8 +3,7 @@
 //
 
 import { Entity, PrimaryColumn, Column, ManyToOne } from 'typeorm';
-import Decimal from 'decimal.js';
-import { decimalTransformer } from '@vulcanize/util';
+import { graphDecimalTransformer, GraphDecimal, bigintTransformer } from '@vulcanize/util';
 
 import { Transaction } from './Transaction';
 import { Pool } from './Pool';
@@ -25,8 +24,8 @@ export class Mint {
   @ManyToOne(() => Transaction, transaction => transaction.mints, { onDelete: 'CASCADE' })
   transaction!: Transaction
 
-  @Column('bigint')
-  timestamp!: BigInt;
+  @Column('numeric', { transformer: bigintTransformer })
+  timestamp!: bigint;
 
   @ManyToOne(() => Pool, { onDelete: 'CASCADE' })
   pool!: Pool
@@ -46,21 +45,21 @@ export class Mint {
   @Column('varchar', { length: 42 })
   origin!: string
 
-  @Column('bigint')
+  @Column('numeric', { transformer: bigintTransformer })
   amount!: bigint
 
-  @Column('numeric', { transformer: decimalTransformer })
-  amount0!: Decimal
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  amount0!: GraphDecimal
 
-  @Column('numeric', { transformer: decimalTransformer })
-  amount1!: Decimal
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  amount1!: GraphDecimal
 
-  @Column('numeric', { transformer: decimalTransformer })
-  amountUSD!: Decimal
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  amountUSD!: GraphDecimal
 
-  @Column('bigint')
+  @Column('numeric', { transformer: bigintTransformer })
   tickLower!: bigint
 
-  @Column('bigint')
+  @Column('numeric', { transformer: bigintTransformer })
   tickUpper!: bigint
 }
diff --git a/packages/uni-info-watcher/src/entity/Pool.ts b/packages/uni-info-watcher/src/entity/Pool.ts
index 7bcff430..10c4f372 100644
--- a/packages/uni-info-watcher/src/entity/Pool.ts
+++ b/packages/uni-info-watcher/src/entity/Pool.ts
@@ -2,9 +2,8 @@
 // Copyright 2021 Vulcanize, Inc.
 //
 
-import Decimal from 'decimal.js';
 import { Entity, PrimaryColumn, Column, ManyToOne } from 'typeorm';
-import { decimalTransformer } from '@vulcanize/util';
+import { graphDecimalTransformer, GraphDecimal, bigintTransformer } from '@vulcanize/util';
 
 import { Token } from './Token';
 
@@ -26,59 +25,59 @@ export class Pool {
   @ManyToOne(() => Token, { onDelete: 'CASCADE' })
   token1!: Token;
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  token0Price!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  token0Price!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  token1Price!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  token1Price!: GraphDecimal
 
-  @Column('numeric')
+  @Column('numeric', { transformer: bigintTransformer })
   feeTier!: bigint
 
-  @Column('numeric', { default: BigInt(0) })
+  @Column('numeric', { default: BigInt(0), transformer: bigintTransformer })
   sqrtPrice!: bigint
 
-  @Column('bigint', { nullable: true })
+  @Column('numeric', { nullable: true, transformer: bigintTransformer })
   tick!: bigint | null
 
-  @Column('numeric', { default: BigInt(0) })
+  @Column('numeric', { default: BigInt(0), transformer: bigintTransformer })
   liquidity!: bigint
 
-  @Column('numeric', { default: BigInt(0) })
+  @Column('numeric', { default: BigInt(0), transformer: bigintTransformer })
   feeGrowthGlobal0X128!: bigint
 
-  @Column('numeric', { default: BigInt(0) })
+  @Column('numeric', { default: BigInt(0), transformer: bigintTransformer })
   feeGrowthGlobal1X128!: bigint
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  totalValueLockedUSD!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  totalValueLockedUSD!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  totalValueLockedToken0!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  totalValueLockedToken0!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  totalValueLockedToken1!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  totalValueLockedToken1!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  totalValueLockedETH!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  totalValueLockedETH!: GraphDecimal
 
-  @Column('bigint', { default: BigInt(0) })
+  @Column('numeric', { default: BigInt(0), transformer: bigintTransformer })
   txCount!: bigint;
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  volumeToken0!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  volumeToken0!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  volumeToken1!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  volumeToken1!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  volumeUSD!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  volumeUSD!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  untrackedVolumeUSD!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  untrackedVolumeUSD!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  feesUSD!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  feesUSD!: GraphDecimal
 
   // TODO: Add remaining fields when they are used.
 }
diff --git a/packages/uni-info-watcher/src/entity/PoolDayData.ts b/packages/uni-info-watcher/src/entity/PoolDayData.ts
index f77ba9d2..47f3729a 100644
--- a/packages/uni-info-watcher/src/entity/PoolDayData.ts
+++ b/packages/uni-info-watcher/src/entity/PoolDayData.ts
@@ -2,9 +2,8 @@
 // Copyright 2021 Vulcanize, Inc.
 //
 
-import Decimal from 'decimal.js';
 import { Entity, PrimaryColumn, Column, ManyToOne } from 'typeorm';
-import { decimalTransformer } from '@vulcanize/util';
+import { graphDecimalTransformer, GraphDecimal, bigintTransformer } from '@vulcanize/util';
 
 import { Pool } from './Pool';
 
@@ -26,56 +25,56 @@ export class PoolDayData {
   @ManyToOne(() => Pool, { onDelete: 'CASCADE' })
   pool!: Pool;
 
-  @Column('numeric', { transformer: decimalTransformer })
-  high!: Decimal;
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  high!: GraphDecimal;
 
-  @Column('numeric', { transformer: decimalTransformer })
-  low!: Decimal;
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  low!: GraphDecimal;
 
-  @Column('numeric', { transformer: decimalTransformer })
-  open!: Decimal;
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  open!: GraphDecimal;
 
-  @Column('numeric', { transformer: decimalTransformer })
-  close!: Decimal;
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  close!: GraphDecimal;
 
-  @Column('numeric', { default: BigInt(0) })
+  @Column('numeric', { default: BigInt(0), transformer: bigintTransformer })
   sqrtPrice!: bigint
 
-  @Column('bigint', { nullable: true })
+  @Column('numeric', { nullable: true, transformer: bigintTransformer })
   tick!: bigint | null
 
-  @Column('numeric', { default: BigInt(0) })
+  @Column('numeric', { default: BigInt(0), transformer: bigintTransformer })
   liquidity!: bigint
 
-  @Column('numeric', { default: BigInt(0) })
+  @Column('numeric', { default: BigInt(0), transformer: bigintTransformer })
   feeGrowthGlobal0X128!: bigint
 
-  @Column('numeric', { default: BigInt(0) })
+  @Column('numeric', { default: BigInt(0), transformer: bigintTransformer })
   feeGrowthGlobal1X128!: bigint
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  token0Price!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  token0Price!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  token1Price!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  token1Price!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  tvlUSD!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  tvlUSD!: GraphDecimal
 
-  @Column('numeric', { default: BigInt(0) })
+  @Column('numeric', { default: BigInt(0), transformer: bigintTransformer })
   txCount!: bigint
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  volumeToken0!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  volumeToken0!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  volumeToken1!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  volumeToken1!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  volumeUSD!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  volumeUSD!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  feesUSD!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  feesUSD!: GraphDecimal
 
   // TODO: Add remaining fields when they are used.
 }
diff --git a/packages/uni-info-watcher/src/entity/PoolHourData.ts b/packages/uni-info-watcher/src/entity/PoolHourData.ts
index 77e920f8..ac91893a 100644
--- a/packages/uni-info-watcher/src/entity/PoolHourData.ts
+++ b/packages/uni-info-watcher/src/entity/PoolHourData.ts
@@ -2,9 +2,8 @@
 // Copyright 2021 Vulcanize, Inc.
 //
 
-import Decimal from 'decimal.js';
 import { Entity, PrimaryColumn, Column, ManyToOne } from 'typeorm';
-import { decimalTransformer } from '@vulcanize/util';
+import { graphDecimalTransformer, GraphDecimal, bigintTransformer } from '@vulcanize/util';
 
 import { Pool } from './Pool';
 
@@ -26,56 +25,56 @@ export class PoolHourData {
   @ManyToOne(() => Pool, { onDelete: 'CASCADE' })
   pool!: Pool;
 
-  @Column('numeric', { transformer: decimalTransformer })
-  high!: Decimal;
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  high!: GraphDecimal;
 
-  @Column('numeric', { transformer: decimalTransformer })
-  low!: Decimal;
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  low!: GraphDecimal;
 
-  @Column('numeric', { transformer: decimalTransformer })
-  open!: Decimal;
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  open!: GraphDecimal;
 
-  @Column('numeric', { transformer: decimalTransformer })
-  close!: Decimal;
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  close!: GraphDecimal;
 
-  @Column('numeric', { default: BigInt(0) })
+  @Column('numeric', { default: BigInt(0), transformer: bigintTransformer })
   sqrtPrice!: bigint
 
-  @Column('bigint', { nullable: true })
+  @Column('numeric', { nullable: true, transformer: bigintTransformer })
   tick!: bigint | null
 
-  @Column('numeric', { default: BigInt(0) })
+  @Column('numeric', { default: BigInt(0), transformer: bigintTransformer })
   liquidity!: bigint
 
-  @Column('numeric', { default: BigInt(0) })
+  @Column('numeric', { default: BigInt(0), transformer: bigintTransformer })
   feeGrowthGlobal0X128!: bigint
 
-  @Column('numeric', { default: BigInt(0) })
+  @Column('numeric', { default: BigInt(0), transformer: bigintTransformer })
   feeGrowthGlobal1X128!: bigint
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  token0Price!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  token0Price!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  token1Price!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  token1Price!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  tvlUSD!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  tvlUSD!: GraphDecimal
 
-  @Column('numeric', { default: BigInt(0) })
+  @Column('numeric', { default: BigInt(0), transformer: bigintTransformer })
   txCount!: bigint
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  volumeToken0!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  volumeToken0!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  volumeToken1!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  volumeToken1!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  volumeUSD!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  volumeUSD!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  feesUSD!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  feesUSD!: GraphDecimal
 
   // TODO: Add remaining fields when they are used.
 }
diff --git a/packages/uni-info-watcher/src/entity/Position.ts b/packages/uni-info-watcher/src/entity/Position.ts
index f2784854..ef4a4a06 100644
--- a/packages/uni-info-watcher/src/entity/Position.ts
+++ b/packages/uni-info-watcher/src/entity/Position.ts
@@ -3,8 +3,7 @@
 //
 
 import { Entity, PrimaryColumn, Column, ManyToOne } from 'typeorm';
-import Decimal from 'decimal.js';
-import { decimalTransformer } from '@vulcanize/util';
+import { graphDecimalTransformer, GraphDecimal, bigintTransformer } from '@vulcanize/util';
 
 import { Pool } from './Pool';
 import { Token } from './Token';
@@ -24,35 +23,35 @@ export class Position {
   @Column('integer')
   blockNumber!: number;
 
-  @Column('bigint')
+  @Column('numeric', { transformer: bigintTransformer })
   feeGrowthInside0LastX128!: bigint
 
-  @Column('bigint')
+  @Column('numeric', { transformer: bigintTransformer })
   feeGrowthInside1LastX128!: bigint
 
-  @Column('bigint', { default: BigInt(0) })
+  @Column('numeric', { default: BigInt(0), transformer: bigintTransformer })
   liquidity!: bigint
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  depositedToken0!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  depositedToken0!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  depositedToken1!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  depositedToken1!: GraphDecimal
 
   @Column('varchar', { length: 42, default: ADDRESS_ZERO })
   owner!: string
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  withdrawnToken0!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  withdrawnToken0!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  withdrawnToken1!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  withdrawnToken1!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  collectedFeesToken0!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  collectedFeesToken0!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  collectedFeesToken1!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  collectedFeesToken1!: GraphDecimal
 
   @ManyToOne(() => Pool, { onDelete: 'CASCADE' })
   pool!: Pool
diff --git a/packages/uni-info-watcher/src/entity/PositionSnapshot.ts b/packages/uni-info-watcher/src/entity/PositionSnapshot.ts
index 676012ee..515344ef 100644
--- a/packages/uni-info-watcher/src/entity/PositionSnapshot.ts
+++ b/packages/uni-info-watcher/src/entity/PositionSnapshot.ts
@@ -3,8 +3,7 @@
 //
 
 import { Entity, PrimaryColumn, Column, ManyToOne } from 'typeorm';
-import Decimal from 'decimal.js';
-import { decimalTransformer } from '@vulcanize/util';
+import { graphDecimalTransformer, GraphDecimal, bigintTransformer } from '@vulcanize/util';
 
 import { Pool } from './Pool';
 import { Transaction } from './Transaction';
@@ -23,38 +22,38 @@ export class PositionSnapshot {
   @Column('integer')
   blockNumber!: number;
 
-  @Column('bigint')
-  timestamp!: BigInt;
+  @Column('numeric', { transformer: bigintTransformer })
+  timestamp!: bigint;
 
-  @Column('bigint')
+  @Column('numeric', { transformer: bigintTransformer })
   feeGrowthInside0LastX128!: bigint
 
-  @Column('bigint')
+  @Column('numeric', { transformer: bigintTransformer })
   feeGrowthInside1LastX128!: bigint
 
-  @Column('bigint', { default: BigInt(0) })
+  @Column('numeric', { default: BigInt(0), transformer: bigintTransformer })
   liquidity!: bigint
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  depositedToken0!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  depositedToken0!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  depositedToken1!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  depositedToken1!: GraphDecimal
 
   @Column('varchar', { length: 42, default: ADDRESS_ZERO })
   owner!: string
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  withdrawnToken0!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  withdrawnToken0!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  withdrawnToken1!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  withdrawnToken1!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  collectedFeesToken0!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  collectedFeesToken0!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  collectedFeesToken1!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  collectedFeesToken1!: GraphDecimal
 
   @ManyToOne(() => Pool, { onDelete: 'CASCADE' })
   pool!: Pool
diff --git a/packages/uni-info-watcher/src/entity/Swap.ts b/packages/uni-info-watcher/src/entity/Swap.ts
index b72e2aeb..d9507028 100644
--- a/packages/uni-info-watcher/src/entity/Swap.ts
+++ b/packages/uni-info-watcher/src/entity/Swap.ts
@@ -3,8 +3,7 @@
 //
 
 import { Entity, PrimaryColumn, Column, ManyToOne } from 'typeorm';
-import Decimal from 'decimal.js';
-import { decimalTransformer } from '@vulcanize/util';
+import { graphDecimalTransformer, GraphDecimal, bigintTransformer } from '@vulcanize/util';
 
 import { Transaction } from './Transaction';
 import { Pool } from './Pool';
@@ -25,8 +24,8 @@ export class Swap {
   @ManyToOne(() => Transaction, transaction => transaction.swaps, { onDelete: 'CASCADE' })
   transaction!: Transaction
 
-  @Column('bigint')
-  timestamp!: BigInt;
+  @Column('numeric', { transformer: bigintTransformer })
+  timestamp!: bigint;
 
   @ManyToOne(() => Pool, { onDelete: 'CASCADE' })
   pool!: Pool
@@ -46,18 +45,18 @@ export class Swap {
   @Column('varchar', { length: 42 })
   recipient!: string
 
-  @Column('numeric', { transformer: decimalTransformer })
-  amount0!: Decimal
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  amount0!: GraphDecimal
 
-  @Column('numeric', { transformer: decimalTransformer })
-  amount1!: Decimal
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  amount1!: GraphDecimal
 
-  @Column('numeric', { transformer: decimalTransformer })
-  amountUSD!: Decimal
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  amountUSD!: GraphDecimal
 
-  @Column('bigint')
+  @Column('numeric', { transformer: bigintTransformer })
   tick!: bigint
 
-  @Column('bigint')
+  @Column('numeric', { transformer: bigintTransformer })
   sqrtPriceX96!: bigint
 }
diff --git a/packages/uni-info-watcher/src/entity/Tick.ts b/packages/uni-info-watcher/src/entity/Tick.ts
index c9acf996..f2bff619 100644
--- a/packages/uni-info-watcher/src/entity/Tick.ts
+++ b/packages/uni-info-watcher/src/entity/Tick.ts
@@ -3,8 +3,7 @@
 //
 
 import { Entity, PrimaryColumn, Column, ManyToOne } from 'typeorm';
-import Decimal from 'decimal.js';
-import { decimalTransformer } from '@vulcanize/util';
+import { graphDecimalTransformer, GraphDecimal, bigintTransformer } from '@vulcanize/util';
 
 import { Pool } from './Pool';
 
@@ -20,8 +19,8 @@ export class Tick {
   @Column('integer')
   blockNumber!: number;
 
-  @Column('bigint')
-  tickIdx!: BigInt;
+  @Column('numeric', { transformer: bigintTransformer })
+  tickIdx!: bigint;
 
   @ManyToOne(() => Pool, { onDelete: 'CASCADE' })
   pool!: Pool
@@ -29,15 +28,15 @@ export class Tick {
   @Column('varchar', { length: 42 })
   poolAddress!: string
 
-  @Column('numeric', { transformer: decimalTransformer })
-  price0!: Decimal
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  price0!: GraphDecimal
 
-  @Column('numeric', { transformer: decimalTransformer })
-  price1!: Decimal
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  price1!: GraphDecimal
 
-  @Column('bigint', { default: 0 })
+  @Column('numeric', { default: 0, transformer: bigintTransformer })
   liquidityGross!: bigint
 
-  @Column('bigint', { default: 0 })
+  @Column('numeric', { default: 0, transformer: bigintTransformer })
   liquidityNet!: bigint
 }
diff --git a/packages/uni-info-watcher/src/entity/Token.ts b/packages/uni-info-watcher/src/entity/Token.ts
index 74954db5..5dbaac19 100644
--- a/packages/uni-info-watcher/src/entity/Token.ts
+++ b/packages/uni-info-watcher/src/entity/Token.ts
@@ -2,9 +2,8 @@
 // Copyright 2021 Vulcanize, Inc.
 //
 
-import Decimal from 'decimal.js';
 import { Entity, PrimaryColumn, Column, ManyToMany, JoinTable } from 'typeorm';
-import { decimalTransformer } from '@vulcanize/util';
+import { graphDecimalTransformer, GraphDecimal, bigintTransformer } from '@vulcanize/util';
 
 import { Pool } from './Pool';
 
@@ -26,35 +25,35 @@ export class Token {
   @Column('varchar')
   name!: string;
 
-  @Column('numeric', { transformer: decimalTransformer })
-  totalSupply!: Decimal;
+  @Column('numeric', { transformer: bigintTransformer })
+  totalSupply!: bigint;
 
-  @Column('bigint')
+  @Column('numeric', { transformer: bigintTransformer })
   decimals!: bigint;
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  derivedETH!: Decimal;
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  derivedETH!: GraphDecimal;
 
-  @Column('bigint', { default: BigInt(0) })
+  @Column('numeric', { default: BigInt(0), transformer: bigintTransformer })
   txCount!: bigint;
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  totalValueLocked!: Decimal;
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  totalValueLocked!: GraphDecimal;
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  totalValueLockedUSD!: Decimal;
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  totalValueLockedUSD!: GraphDecimal;
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  volume!: Decimal;
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  volume!: GraphDecimal;
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  volumeUSD!: Decimal;
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  volumeUSD!: GraphDecimal;
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  untrackedVolumeUSD!: Decimal;
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  untrackedVolumeUSD!: GraphDecimal;
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  feesUSD!: Decimal;
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  feesUSD!: GraphDecimal;
 
   @ManyToMany(() => Pool)
   @JoinTable()
diff --git a/packages/uni-info-watcher/src/entity/TokenDayData.ts b/packages/uni-info-watcher/src/entity/TokenDayData.ts
index b82b0553..f5b794a1 100644
--- a/packages/uni-info-watcher/src/entity/TokenDayData.ts
+++ b/packages/uni-info-watcher/src/entity/TokenDayData.ts
@@ -3,8 +3,7 @@
 //
 
 import { Entity, PrimaryColumn, Column, ManyToOne } from 'typeorm';
-import Decimal from 'decimal.js';
-import { decimalTransformer } from '@vulcanize/util';
+import { graphDecimalTransformer, GraphDecimal } from '@vulcanize/util';
 
 import { Token } from './Token';
 
@@ -26,36 +25,36 @@ export class TokenDayData {
   @ManyToOne(() => Token, { onDelete: 'CASCADE' })
   token!: Token
 
-  @Column('numeric', { transformer: decimalTransformer })
-  high!: Decimal;
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  high!: GraphDecimal;
 
-  @Column('numeric', { transformer: decimalTransformer })
-  low!: Decimal;
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  low!: GraphDecimal;
 
-  @Column('numeric', { transformer: decimalTransformer })
-  open!: Decimal;
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  open!: GraphDecimal;
 
-  @Column('numeric', { transformer: decimalTransformer })
-  close!: Decimal;
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  close!: GraphDecimal;
 
-  @Column('numeric', { transformer: decimalTransformer })
-  priceUSD!: Decimal
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  priceUSD!: GraphDecimal
 
-  @Column('numeric', { transformer: decimalTransformer })
-  totalValueLocked!: Decimal
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  totalValueLocked!: GraphDecimal
 
-  @Column('numeric', { transformer: decimalTransformer })
-  totalValueLockedUSD!: Decimal
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  totalValueLockedUSD!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  volumeUSD!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  volumeUSD!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  volume!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  volume!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  untrackedVolumeUSD!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  untrackedVolumeUSD!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  feesUSD!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  feesUSD!: GraphDecimal
 }
diff --git a/packages/uni-info-watcher/src/entity/TokenHourData.ts b/packages/uni-info-watcher/src/entity/TokenHourData.ts
index 9565d843..53c8f32f 100644
--- a/packages/uni-info-watcher/src/entity/TokenHourData.ts
+++ b/packages/uni-info-watcher/src/entity/TokenHourData.ts
@@ -3,8 +3,7 @@
 //
 
 import { Entity, PrimaryColumn, Column, ManyToOne } from 'typeorm';
-import Decimal from 'decimal.js';
-import { decimalTransformer } from '@vulcanize/util';
+import { graphDecimalTransformer, GraphDecimal } from '@vulcanize/util';
 
 import { Token } from './Token';
 
@@ -26,36 +25,36 @@ export class TokenHourData {
   @ManyToOne(() => Token, { onDelete: 'CASCADE' })
   token!: Token
 
-  @Column('numeric', { transformer: decimalTransformer })
-  high!: Decimal;
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  high!: GraphDecimal;
 
-  @Column('numeric', { transformer: decimalTransformer })
-  low!: Decimal;
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  low!: GraphDecimal;
 
-  @Column('numeric', { transformer: decimalTransformer })
-  open!: Decimal;
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  open!: GraphDecimal;
 
-  @Column('numeric', { transformer: decimalTransformer })
-  close!: Decimal;
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  close!: GraphDecimal;
 
-  @Column('numeric', { transformer: decimalTransformer })
-  priceUSD!: Decimal
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  priceUSD!: GraphDecimal
 
-  @Column('numeric', { transformer: decimalTransformer })
-  totalValueLocked!: Decimal
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  totalValueLocked!: GraphDecimal
 
-  @Column('numeric', { transformer: decimalTransformer })
-  totalValueLockedUSD!: Decimal
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  totalValueLockedUSD!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  volumeUSD!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  volumeUSD!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  volume!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  volume!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  untrackedVolumeUSD!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  untrackedVolumeUSD!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  feesUSD!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  feesUSD!: GraphDecimal
 }
diff --git a/packages/uni-info-watcher/src/entity/Transaction.ts b/packages/uni-info-watcher/src/entity/Transaction.ts
index 7b756cc3..a1ccfefa 100644
--- a/packages/uni-info-watcher/src/entity/Transaction.ts
+++ b/packages/uni-info-watcher/src/entity/Transaction.ts
@@ -2,9 +2,8 @@
 // Copyright 2021 Vulcanize, Inc.
 //
 
-import Decimal from 'decimal.js';
 import { Entity, PrimaryColumn, Column, OneToMany } from 'typeorm';
-import { decimalTransformer } from '@vulcanize/util';
+import { graphDecimalTransformer, GraphDecimal, bigintTransformer } from '@vulcanize/util';
 
 import { Mint } from './Mint';
 import { Burn } from './Burn';
@@ -22,11 +21,11 @@ export class Transaction {
   @Column('integer')
   blockNumber!: number;
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  ethPriceUSD!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  ethPriceUSD!: GraphDecimal
 
-  @Column('bigint')
-  timestamp!: BigInt;
+  @Column('numeric', { transformer: bigintTransformer })
+  timestamp!: bigint;
 
   @OneToMany(() => Mint, mint => mint.transaction)
   mints!: Mint[];
diff --git a/packages/uni-info-watcher/src/entity/UniswapDayData.ts b/packages/uni-info-watcher/src/entity/UniswapDayData.ts
index 6d89cef2..e2409d49 100644
--- a/packages/uni-info-watcher/src/entity/UniswapDayData.ts
+++ b/packages/uni-info-watcher/src/entity/UniswapDayData.ts
@@ -3,8 +3,7 @@
 //
 
 import { Entity, PrimaryColumn, Column } from 'typeorm';
-import Decimal from 'decimal.js';
-import { decimalTransformer } from '@vulcanize/util';
+import { graphDecimalTransformer, GraphDecimal, bigintTransformer } from '@vulcanize/util';
 
 @Entity()
 export class UniswapDayData {
@@ -21,18 +20,18 @@ export class UniswapDayData {
   @Column('integer')
   date!: number
 
-  @Column('numeric', { transformer: decimalTransformer })
-  tvlUSD!: Decimal
+  @Column('numeric', { transformer: graphDecimalTransformer })
+  tvlUSD!: GraphDecimal
 
-  @Column('numeric', { default: 0, transformer: decimalTransformer })
-  volumeUSD!: Decimal
+  @Column('numeric', { default: 0, transformer: graphDecimalTransformer })
+  volumeUSD!: GraphDecimal
 
-  @Column('bigint')
+  @Column('numeric', { transformer: bigintTransformer })
   txCount!: bigint;
 
-  @Column('numeric', { transformer: decimalTransformer, default: 0 })
-  volumeETH!: Decimal
+  @Column('numeric', { transformer: graphDecimalTransformer, default: 0 })
+  volumeETH!: GraphDecimal
 
-  @Column('numeric', { transformer: decimalTransformer, default: 0 })
-  feesUSD!: Decimal
+  @Column('numeric', { transformer: graphDecimalTransformer, default: 0 })
+  feesUSD!: GraphDecimal
 }
diff --git a/packages/uni-info-watcher/src/indexer.ts b/packages/uni-info-watcher/src/indexer.ts
index 4c004acf..f65769ed 100644
--- a/packages/uni-info-watcher/src/indexer.ts
+++ b/packages/uni-info-watcher/src/indexer.ts
@@ -11,14 +11,13 @@ import { providers, utils } from 'ethers';
 import { Client as UniClient } from '@vulcanize/uni-watcher';
 import { Client as ERC20Client } from '@vulcanize/erc20-watcher';
 import { EthClient } from '@vulcanize/ipld-eth-client';
-import { IndexerInterface, Indexer as BaseIndexer, QueryOptions, OrderDirection, BlockHeight, Relation } from '@vulcanize/util';
+import { IndexerInterface, Indexer as BaseIndexer, QueryOptions, OrderDirection, BlockHeight, Relation, GraphDecimal } from '@vulcanize/util';
 
 import { findEthPerToken, getEthPriceInUSD, getTrackedAmountUSD, sqrtPriceX96ToTokenPrices, WHITELIST_TOKENS } from './utils/pricing';
 import { updatePoolDayData, updatePoolHourData, updateTokenDayData, updateTokenHourData, updateUniswapDayData } from './utils/interval-updates';
 import { Token } from './entity/Token';
 import { convertTokenToDecimal, loadTransaction, safeDiv } from './utils';
 import { createTick } from './utils/tick';
-import Decimal from 'decimal.js';
 import { Position } from './entity/Position';
 import { Database } from './database';
 import { Event } from './entity/Event';
@@ -874,12 +873,12 @@ export class Indexer implements IndexerInterface {
       let amount0Abs = amount0;
       let amount1Abs = amount1;
 
-      if (amount0.lt(new Decimal(0))) {
-        amount0Abs = amount0.times(new Decimal('-1'));
+      if (amount0.lt(new GraphDecimal(0))) {
+        amount0Abs = amount0.times(new GraphDecimal('-1'));
       }
 
-      if (amount1.lt(new Decimal(0))) {
-        amount1Abs = amount1.times(new Decimal('-1'));
+      if (amount1.lt(new GraphDecimal(0))) {
+        amount1Abs = amount1.times(new GraphDecimal('-1'));
       }
 
       const amount0ETH = amount0Abs.times(token0.derivedETH);
@@ -889,12 +888,12 @@ export class Indexer implements IndexerInterface {
 
       // Get amount that should be tracked only - div 2 because cant count both input and output as volume.
       const trackedAmountUSD = await getTrackedAmountUSD(this._db, dbTx, amount0Abs, token0, amount1Abs, token1, this._isDemo);
-      const amountTotalUSDTracked = trackedAmountUSD.div(new Decimal('2'));
+      const amountTotalUSDTracked = trackedAmountUSD.div(new GraphDecimal('2'));
       const amountTotalETHTracked = safeDiv(amountTotalUSDTracked, bundle.ethPriceUSD);
-      const amountTotalUSDUntracked = amount0USD.plus(amount1USD).div(new Decimal('2'));
+      const amountTotalUSDUntracked = amount0USD.plus(amount1USD).div(new GraphDecimal('2'));
 
-      const feesETH = amountTotalETHTracked.times(pool.feeTier.toString()).div(new Decimal('1000000'));
-      const feesUSD = amountTotalUSDTracked.times(pool.feeTier.toString()).div(new Decimal('1000000'));
+      const feesETH = amountTotalETHTracked.times(pool.feeTier.toString()).div(new GraphDecimal('1000000'));
+      const feesUSD = amountTotalUSDTracked.times(pool.feeTier.toString()).div(new GraphDecimal('1000000'));
 
       // Global updates.
       factory.txCount = BigInt(factory.txCount) + BigInt(1);
diff --git a/packages/uni-info-watcher/src/resolvers.ts b/packages/uni-info-watcher/src/resolvers.ts
index f4b2ba05..0fda3f06 100644
--- a/packages/uni-info-watcher/src/resolvers.ts
+++ b/packages/uni-info-watcher/src/resolvers.ts
@@ -5,8 +5,9 @@
 import assert from 'assert';
 import BigInt from 'apollo-type-bigint';
 import debug from 'debug';
+import { GraphQLScalarType } from 'graphql';
 
-import { BlockHeight, OrderDirection } from '@vulcanize/util';
+import { BlockHeight, GraphDecimal, OrderDirection } from '@vulcanize/util';
 
 import { Indexer } from './indexer';
 import { Burn } from './entity/Burn';
@@ -35,6 +36,19 @@ export const createResolvers = async (indexer: Indexer, eventWatcher: EventWatch
   return {
     BigInt: new BigInt('bigInt'),
 
+    BigDecimal: new GraphQLScalarType({
+      name: 'BigDecimal',
+      description: 'BigDecimal custom scalar type',
+      parseValue (value) {
+        // value from the client
+        return new GraphDecimal(value);
+      },
+      serialize (value: GraphDecimal) {
+        // value sent to the client
+        return value.toFixed();
+      }
+    }),
+
     ChainIndexingStatus: {
       __resolveType: () => {
         return 'EthereumIndexingStatus';
diff --git a/packages/uni-info-watcher/src/utils/index.ts b/packages/uni-info-watcher/src/utils/index.ts
index 55fe7c01..9bec032f 100644
--- a/packages/uni-info-watcher/src/utils/index.ts
+++ b/packages/uni-info-watcher/src/utils/index.ts
@@ -2,16 +2,17 @@
 // Copyright 2021 Vulcanize, Inc.
 //
 
-import Decimal from 'decimal.js';
 import { BigNumber } from 'ethers';
 import { QueryRunner } from 'typeorm';
 
+import { GraphDecimal } from '@vulcanize/util';
+
 import { Transaction as TransactionEntity } from '../entity/Transaction';
 import { Database } from '../database';
 import { Block, Transaction } from '../events';
 
-export const exponentToBigDecimal = (decimals: bigint): Decimal => {
-  let bd = new Decimal(1);
+export const exponentToBigDecimal = (decimals: bigint): GraphDecimal => {
+  let bd = new GraphDecimal(1);
 
   for (let i = 0; BigNumber.from(decimals).gte(i); i++) {
     bd = bd.times(10);
@@ -20,12 +21,12 @@ export const exponentToBigDecimal = (decimals: bigint): Decimal => {
   return bd;
 };
 
-export const convertTokenToDecimal = (tokenAmount: bigint, exchangeDecimals: bigint): Decimal => {
+export const convertTokenToDecimal = (tokenAmount: bigint, exchangeDecimals: bigint): GraphDecimal => {
   if (exchangeDecimals === BigInt(0)) {
-    return new Decimal(tokenAmount.toString());
+    return new GraphDecimal(tokenAmount.toString());
   }
 
-  return (new Decimal(tokenAmount.toString())).div(exponentToBigDecimal(exchangeDecimals));
+  return (new GraphDecimal(tokenAmount.toString())).div(exponentToBigDecimal(exchangeDecimals));
 };
 
 export const loadTransaction = async (db: Database, dbTx: QueryRunner, event: { block: Block, tx: Transaction }): Promise<TransactionEntity> => {
@@ -44,21 +45,21 @@ export const loadTransaction = async (db: Database, dbTx: QueryRunner, event: {
 };
 
 // Return 0 if denominator is 0 in division.
-export const safeDiv = (amount0: Decimal, amount1: Decimal): Decimal => {
+export const safeDiv = (amount0: GraphDecimal, amount1: GraphDecimal): GraphDecimal => {
   if (amount1.isZero()) {
-    return new Decimal(0);
+    return new GraphDecimal(0);
   } else {
     return amount0.div(amount1);
   }
 };
 
-export const bigDecimalExponated = (value: Decimal, power: bigint): Decimal => {
+export const bigDecimalExponated = (value: GraphDecimal, power: bigint): GraphDecimal => {
   if (power === BigInt(0)) {
-    return new Decimal(1);
+    return new GraphDecimal(1);
   }
 
   const negativePower = power > BigInt(0);
-  let result = (new Decimal(0)).plus(value);
+  let result = (new GraphDecimal(0)).plus(value);
   const powerAbs = BigNumber.from(power).abs();
 
   for (let i = BigNumber.from(1); i.lt(powerAbs); i = i.add(1)) {
@@ -66,7 +67,7 @@ export const bigDecimalExponated = (value: Decimal, power: bigint): Decimal => {
   }
 
   if (negativePower) {
-    result = safeDiv(new Decimal(1), result);
+    result = safeDiv(new GraphDecimal(1), result);
   }
 
   return result;
diff --git a/packages/uni-info-watcher/src/utils/pricing.ts b/packages/uni-info-watcher/src/utils/pricing.ts
index 6a77419e..8350a615 100644
--- a/packages/uni-info-watcher/src/utils/pricing.ts
+++ b/packages/uni-info-watcher/src/utils/pricing.ts
@@ -3,10 +3,11 @@
 //
 
 import assert from 'assert';
-import Decimal from 'decimal.js';
 import { BigNumber } from 'ethers';
 import { QueryRunner } from 'typeorm';
 
+import { GraphDecimal } from '@vulcanize/util';
+
 import { exponentToBigDecimal, safeDiv } from '.';
 import { Database } from '../database';
 import { Token } from '../entity/Token';
@@ -43,30 +44,30 @@ export const WHITELIST_TOKENS: string[] = [
   '0x7fc66500c84a76ad7e9c93437bfc5ac33e2ddae9' // AAVE
 ];
 
-const MINIMUM_ETH_LOCKED = new Decimal(52);
+const MINIMUM_ETH_LOCKED = new GraphDecimal(52);
 const Q192 = 2 ** 192;
 
 // Constants used in demo.
 const ETH_PRICE_IN_USD = '3200.00';
 
-export const sqrtPriceX96ToTokenPrices = (sqrtPriceX96: bigint, token0: Token, token1: Token): Decimal[] => {
-  const num = new Decimal((sqrtPriceX96 * sqrtPriceX96).toString());
-  const denom = new Decimal(Q192.toString());
+export const sqrtPriceX96ToTokenPrices = (sqrtPriceX96: bigint, token0: Token, token1: Token): GraphDecimal[] => {
+  const num = new GraphDecimal((sqrtPriceX96 * sqrtPriceX96).toString());
+  const denom = new GraphDecimal(Q192.toString());
 
   const price1 = num
     .div(denom)
     .times(exponentToBigDecimal(token0.decimals))
     .div(exponentToBigDecimal(token1.decimals));
 
-  const price0 = safeDiv(new Decimal('1'), price1);
+  const price0 = safeDiv(new GraphDecimal('1'), price1);
 
   return [price0, price1];
 };
 
-export const getEthPriceInUSD = async (db: Database, dbTx: QueryRunner, block: Block, isDemo: boolean): Promise<Decimal> => {
+export const getEthPriceInUSD = async (db: Database, dbTx: QueryRunner, block: Block, isDemo: boolean): Promise<GraphDecimal> => {
   if (isDemo) {
     // For demo purpose in local development.
-    const ethPriceInUSD = new Decimal(ETH_PRICE_IN_USD);
+    const ethPriceInUSD = new GraphDecimal(ETH_PRICE_IN_USD);
     return ethPriceInUSD;
   }
 
@@ -76,7 +77,7 @@ export const getEthPriceInUSD = async (db: Database, dbTx: QueryRunner, block: B
   if (usdcPool) {
     return usdcPool.token0Price;
   } else {
-    return new Decimal(0);
+    return new GraphDecimal(0);
   }
 };
 
@@ -84,16 +85,16 @@ export const getEthPriceInUSD = async (db: Database, dbTx: QueryRunner, block: B
  * Search through graph to find derived Eth per token.
  * @todo update to be derived ETH (add stablecoin estimates)
  **/
-export const findEthPerToken = async (db: Database, dbTx: QueryRunner, token: Token, isDemo: boolean): Promise<Decimal> => {
+export const findEthPerToken = async (db: Database, dbTx: QueryRunner, token: Token, isDemo: boolean): Promise<GraphDecimal> => {
   if (token.id === WETH_ADDRESS || isDemo) {
-    return new Decimal(1);
+    return new GraphDecimal(1);
   }
 
   const whiteList = token.whitelistPools;
   // For now just take USD from pool with greatest TVL.
   // Need to update this to actually detect best rate based on liquidity distribution.
-  let largestLiquidityETH = new Decimal(0);
-  let priceSoFar = new Decimal(0);
+  let largestLiquidityETH = new GraphDecimal(0);
+  let priceSoFar = new GraphDecimal(0);
 
   for (let i = 0; i < whiteList.length; ++i) {
     const poolAddress = whiteList[i].id;
@@ -139,12 +140,12 @@ export const findEthPerToken = async (db: Database, dbTx: QueryRunner, token: To
 export const getTrackedAmountUSD = async (
   db: Database,
   dbTx: QueryRunner,
-  tokenAmount0: Decimal,
+  tokenAmount0: GraphDecimal,
   token0: Token,
-  tokenAmount1: Decimal,
+  tokenAmount1: GraphDecimal,
   token1: Token,
   isDemo: boolean
-): Promise<Decimal> => {
+): Promise<GraphDecimal> => {
   const bundle = await db.getBundle(dbTx, { id: '1' });
   assert(bundle);
   const price0USD = token0.derivedETH.times(bundle.ethPriceUSD);
@@ -158,14 +159,14 @@ export const getTrackedAmountUSD = async (
 
   // Take double value of the whitelisted token amount.
   if (WHITELIST_TOKENS.includes(token0.id) && !WHITELIST_TOKENS.includes(token1.id)) {
-    return tokenAmount0.times(price0USD).times(new Decimal('2'));
+    return tokenAmount0.times(price0USD).times(new GraphDecimal('2'));
   }
 
   // Take double value of the whitelisted token amount.
   if (!WHITELIST_TOKENS.includes(token0.id) && WHITELIST_TOKENS.includes(token1.id)) {
-    return tokenAmount1.times(price1USD).times(new Decimal('2'));
+    return tokenAmount1.times(price1USD).times(new GraphDecimal('2'));
   }
 
   // Neither token is on white list, tracked amount is 0.
-  return new Decimal(0);
+  return new GraphDecimal(0);
 };
diff --git a/packages/uni-info-watcher/src/utils/tick.ts b/packages/uni-info-watcher/src/utils/tick.ts
index 25092dd3..5a38b3cc 100644
--- a/packages/uni-info-watcher/src/utils/tick.ts
+++ b/packages/uni-info-watcher/src/utils/tick.ts
@@ -2,9 +2,10 @@
 // Copyright 2021 Vulcanize, Inc.
 //
 
-import Decimal from 'decimal.js';
 import { QueryRunner } from 'typeorm';
 
+import { GraphDecimal } from '@vulcanize/util';
+
 import { Pool } from '../entity/Pool';
 import { Database } from '../database';
 import { bigDecimalExponated, safeDiv } from '.';
@@ -19,10 +20,10 @@ export const createTick = async (db: Database, dbTx: QueryRunner, tickId: string
   tick.poolAddress = pool.id;
 
   // 1.0001^tick is token1/token0.
-  const price0 = bigDecimalExponated(new Decimal('1.0001'), tickIdx);
+  const price0 = bigDecimalExponated(new GraphDecimal('1.0001'), tickIdx);
 
   tick.price0 = price0;
-  tick.price1 = safeDiv(new Decimal(1), price0);
+  tick.price1 = safeDiv(new GraphDecimal(1), price0);
 
   return db.saveTick(dbTx, tick, block);
 };
diff --git a/packages/uni-info-watcher/test/utils.ts b/packages/uni-info-watcher/test/utils.ts
index 63733ca2..ae80bdee 100644
--- a/packages/uni-info-watcher/test/utils.ts
+++ b/packages/uni-info-watcher/test/utils.ts
@@ -4,10 +4,9 @@
 
 import { expect } from 'chai';
 import { ethers } from 'ethers';
-import Decimal from 'decimal.js';
 import _ from 'lodash';
 
-import { OrderDirection } from '@vulcanize/util';
+import { OrderDirection, GraphDecimal } from '@vulcanize/util';
 import { insertNDummyBlocks } from '@vulcanize/util/test';
 
 import { Database } from '../src/database';
@@ -102,7 +101,7 @@ export const checkTokenHourData = async (client: Client, tokenAddress: string):
   const hourStartUnix = hourIndex * 3600;
   const tokenData = await client.getToken(tokenAddress);
   const bundles = await client.getBundles(1);
-  const tokenPrice = new Decimal(tokenData.token.derivedETH).times(bundles[0].ethPriceUSD);
+  const tokenPrice = new GraphDecimal(tokenData.token.derivedETH).times(bundles[0].ethPriceUSD);
 
   expect(tokenID).to.be.equal(tokenAddress);
   expect(periodStartUnix).to.be.equal(hourStartUnix);
@@ -203,7 +202,7 @@ export const insertDummyToken = async (db: Database, block: Block, token?: Token
     token.symbol = 'TEST';
     token.name = 'TestToken';
     token.id = tokenAddress;
-    token.totalSupply = new Decimal(0);
+    token.totalSupply = BigInt(0);
     token.decimals = BigInt(0);
   }
 
diff --git a/packages/util/index.ts b/packages/util/index.ts
index 8512ee36..1f394723 100644
--- a/packages/util/index.ts
+++ b/packages/util/index.ts
@@ -12,3 +12,4 @@ export * from './src/events';
 export * from './src/types';
 export * from './src/indexer';
 export * from './src/job-runner';
+export * from './src/graph-decimal';
diff --git a/packages/util/package.json b/packages/util/package.json
index 48f60b4e..8647301c 100644
--- a/packages/util/package.json
+++ b/packages/util/package.json
@@ -6,6 +6,7 @@
   "dependencies": {
     "@vulcanize/solidity-mapper": "^0.1.0",
     "debug": "^4.3.1",
+    "decimal.js": "^10.3.1",
     "ethers": "^5.2.0",
     "fs-extra": "^10.0.0",
     "pg-boss": "^6.1.0",
@@ -15,9 +16,10 @@
     "@types/fs-extra": "^9.0.11",
     "@typescript-eslint/eslint-plugin": "^4.25.0",
     "@typescript-eslint/parser": "^4.25.0",
+    "@uniswap/v3-periphery": "1.0.0",
     "@vulcanize/cache": "^0.1.0",
     "@vulcanize/ipld-eth-client": "^0.1.0",
-    "@uniswap/v3-periphery": "1.0.0",
+    "apollo-server-express": "^2.25.0",
     "eslint": "^7.27.0",
     "eslint-config-semistandard": "^15.0.1",
     "eslint-config-standard": "^16.0.3",
@@ -26,11 +28,9 @@
     "eslint-plugin-promise": "^5.1.0",
     "eslint-plugin-standard": "^5.0.0",
     "hardhat": "^2.3.0",
-    "typeorm": "^0.2.32",
-    "typeorm-naming-strategies": "^2.0.0",
     "lodash": "^4.17.21",
-    "apollo-server-express": "^2.25.0",
-    "decimal.js": "^10.3.1"
+    "typeorm": "^0.2.32",
+    "typeorm-naming-strategies": "^2.0.0"
   },
   "scripts": {
     "lint": "eslint .",
diff --git a/packages/util/src/graph-decimal.ts b/packages/util/src/graph-decimal.ts
new file mode 100644
index 00000000..0bca9a8c
--- /dev/null
+++ b/packages/util/src/graph-decimal.ts
@@ -0,0 +1,210 @@
+//
+// Copyright 2021 Vulcanize, Inc.
+//
+
+import Decimal from 'decimal.js';
+
+// Constant used in function digitsToString.
+const LOG_BASE = 7;
+
+// Customize Decimal according the limits of IEEE-754 decimal128.
+// Reference: https://github.com/graphprotocol/graph-node/blob/v0.24.2/graph/src/data/store/scalar.rs#L42
+const MIN_EXP = -6143;
+const MAX_EXP = 6144;
+const PRECISION = 34;
+const _GraphDecimal = Decimal.clone({ precision: PRECISION });
+
+// Wrapper class around Decimal.
+export class GraphDecimal {
+  value: Decimal;
+
+  constructor (n: Decimal.Value) {
+    // Apply precision to the input value using toSignificantDigits().
+    this.value = new _GraphDecimal(n).toSignificantDigits();
+  }
+
+  toString (): string {
+    this._checkOutOfRange(this);
+
+    return this.value.toString();
+  }
+
+  toFixed (): string {
+    this._checkOutOfRange(this);
+
+    return this.value.toFixed();
+  }
+
+  plus (n: Decimal.Value | GraphDecimal): GraphDecimal {
+    this._checkOutOfRange(this);
+    const param = this._checkOutOfRange(n);
+
+    return new GraphDecimal(this.value.plus(param));
+  }
+
+  add (n: Decimal.Value | GraphDecimal): GraphDecimal {
+    this._checkOutOfRange(this);
+    const param = this._checkOutOfRange(n);
+
+    return new GraphDecimal(this.value.add(param));
+  }
+
+  minus (n: Decimal.Value | GraphDecimal): GraphDecimal {
+    this._checkOutOfRange(this);
+    const param = this._checkOutOfRange(n);
+
+    return new GraphDecimal(this.value.minus(param));
+  }
+
+  sub (n: Decimal.Value | GraphDecimal): GraphDecimal {
+    this._checkOutOfRange(this);
+    const param = this._checkOutOfRange(n);
+
+    return new GraphDecimal(this.value.sub(param));
+  }
+
+  times (n: Decimal.Value | GraphDecimal): GraphDecimal {
+    this._checkOutOfRange(this);
+    const param = this._checkOutOfRange(n);
+
+    return new GraphDecimal(this.value.times(param));
+  }
+
+  mul (n: Decimal.Value | GraphDecimal): GraphDecimal {
+    this._checkOutOfRange(this);
+    const param = this._checkOutOfRange(n);
+
+    return new GraphDecimal(this.value.mul(param));
+  }
+
+  dividedBy (n: Decimal.Value | GraphDecimal): GraphDecimal {
+    this._checkOutOfRange(this);
+    const param = this._checkOutOfRange(n);
+
+    return new GraphDecimal(this.value.dividedBy(param));
+  }
+
+  div (n: Decimal.Value | GraphDecimal): GraphDecimal {
+    this._checkOutOfRange(this);
+    const param = this._checkOutOfRange(n);
+
+    return new GraphDecimal(this.value.div(param));
+  }
+
+  isZero (): boolean {
+    this._checkOutOfRange(this);
+
+    return this.value.isZero();
+  }
+
+  lessThan (n: Decimal.Value | GraphDecimal): boolean {
+    this._checkOutOfRange(this);
+    const param = this._checkOutOfRange(n);
+
+    return this.value.lessThan(param);
+  }
+
+  lt (n: Decimal.Value | GraphDecimal): boolean {
+    this._checkOutOfRange(this);
+    const param = this._checkOutOfRange(n);
+
+    return this.value.lt(param);
+  }
+
+  greaterThan (n: Decimal.Value | GraphDecimal): boolean {
+    this._checkOutOfRange(this);
+    const param = this._checkOutOfRange(n);
+
+    return this.value.lessThan(param);
+  }
+
+  gt (n: Decimal.Value | GraphDecimal): boolean {
+    this._checkOutOfRange(this);
+    const param = this._checkOutOfRange(n);
+
+    return this.value.lessThan(param);
+  }
+
+  comparedTo (n: Decimal.Value | GraphDecimal): number {
+    this._checkOutOfRange(this);
+    const param = this._checkOutOfRange(n);
+
+    return this.value.comparedTo(param);
+  }
+
+  cmp (n: Decimal.Value | GraphDecimal): number {
+    this._checkOutOfRange(this);
+    const param = this._checkOutOfRange(n);
+
+    return this.value.cmp(param);
+  }
+
+  /**
+   * Function to check and throw an error if a given value has exponent out of the specified range (MIN_EXP to MAX_EXP).
+   * @param n A Decimal value to check the range for.
+   * @returns A Decimal.Value instance.
+   */
+  private _checkOutOfRange (n: Decimal.Value | GraphDecimal): Decimal.Value {
+    let exp;
+
+    // Return n.value if n is an instance of GraphDecimal.
+    if (n instanceof GraphDecimal) {
+      n = n.value;
+      exp = _getGraphExp(n.d, n.e);
+    } else {
+      const decimal = new Decimal(n);
+      exp = _getGraphExp(decimal.d, decimal.e);
+    }
+
+    if (exp < MIN_EXP || exp > MAX_EXP) {
+      throw new Error(`Big decimal exponent '${exp}' is outside the '${MIN_EXP}' to '${MAX_EXP}' range`);
+    }
+
+    return n;
+  }
+}
+
+// Get exponent from Decimal d and e according to format in graph-node.
+function _getGraphExp (d: any, e: number): number {
+  const digits = _digitsToString(d);
+  const exp = e - digits.length + 1;
+
+  return exp;
+}
+
+// Get digits in a string from an array of digit numbers (Decimal().d)
+// https://github.com/MikeMcl/decimal.js/blob/master/decimal.mjs#L2516
+function _digitsToString (d: any) {
+  let i, k, ws;
+  const indexOfLastWord = d.length - 1;
+  let str = '';
+  let w = d[0];
+
+  if (indexOfLastWord > 0) {
+    str += w;
+    for (i = 1; i < indexOfLastWord; i++) {
+      ws = d[i] + '';
+      k = LOG_BASE - ws.length;
+      if (k) str += _getZeroString(k);
+      str += ws;
+    }
+
+    w = d[i];
+    ws = w + '';
+    k = LOG_BASE - ws.length;
+    if (k) str += _getZeroString(k);
+  } else if (w === 0) {
+    return '0';
+  }
+
+  // Remove trailing zeros of last w.
+  for (; w % 10 === 0;) w /= 10;
+
+  return str + w;
+}
+
+function _getZeroString (k: any) {
+  let zs = '';
+  for (; k--;) zs += '0';
+  return zs;
+}
diff --git a/packages/util/src/misc.ts b/packages/util/src/misc.ts
index bab67ee7..57ff8b48 100644
--- a/packages/util/src/misc.ts
+++ b/packages/util/src/misc.ts
@@ -3,15 +3,16 @@
 //
 
 import assert from 'assert';
-import Decimal from 'decimal.js';
 import { ValueTransformer } from 'typeorm';
 import yargs from 'yargs';
 import { hideBin } from 'yargs/helpers';
 import { utils, getDefaultProvider, providers } from 'ethers';
+import Decimal from 'decimal.js';
 
 import { DEFAULT_CONFIG_PATH } from './constants';
 import { Config } from './config';
 import { JobQueue } from './job-queue';
+import { GraphDecimal } from './graph-decimal';
 
 /**
  * Method to wait for specified time.
@@ -19,6 +20,26 @@ import { JobQueue } from './job-queue';
  */
 export const wait = async (time: number): Promise<void> => new Promise(resolve => setTimeout(resolve, time));
 
+/**
+ * Transformer used by typeorm entity for GraphDecimal type fields.
+ */
+export const graphDecimalTransformer: ValueTransformer = {
+  to: (value?: GraphDecimal) => {
+    if (value) {
+      return value.toFixed();
+    }
+
+    return value;
+  },
+  from: (value?: string) => {
+    if (value) {
+      return new GraphDecimal(value);
+    }
+
+    return value;
+  }
+};
+
 /**
  * Transformer used by typeorm entity for Decimal type fields.
  */