diff --git a/packages/codegen/src/templates/fill-template.handlebars b/packages/codegen/src/templates/fill-template.handlebars
index 15e634c2..5a6b1eab 100644
--- a/packages/codegen/src/templates/fill-template.handlebars
+++ b/packages/codegen/src/templates/fill-template.handlebars
@@ -8,11 +8,10 @@ import yargs from 'yargs';
 import { hideBin } from 'yargs/helpers';
 import debug from 'debug';
 import { PubSub } from 'apollo-server-express';
-import { getDefaultProvider } from 'ethers';
 
 import { getCache } from '@vulcanize/cache';
 import { EthClient } from '@vulcanize/ipld-eth-client';
-import { getConfig, fillBlocks, JobQueue, DEFAULT_CONFIG_PATH } from '@vulcanize/util';
+import { getConfig, fillBlocks, JobQueue, DEFAULT_CONFIG_PATH, getCustomProvider } from '@vulcanize/util';
 
 import { Database } from './database';
 import { Indexer } from './indexer';
@@ -71,7 +70,7 @@ export const main = async (): Promise<any> => {
     cache
   });
 
-  const ethProvider = getDefaultProvider(rpcProviderEndpoint);
+  const ethProvider = getCustomProvider(rpcProviderEndpoint);
 
   // Note: In-memory pubsub works fine for now, as each watcher is a single process anyway.
   // Later: https://www.apollographql.com/docs/apollo-server/data/subscriptions/#production-pubsub-libraries
diff --git a/packages/codegen/src/templates/job-runner-template.handlebars b/packages/codegen/src/templates/job-runner-template.handlebars
index c1f6c804..9fa01d76 100644
--- a/packages/codegen/src/templates/job-runner-template.handlebars
+++ b/packages/codegen/src/templates/job-runner-template.handlebars
@@ -7,7 +7,6 @@ import 'reflect-metadata';
 import yargs from 'yargs';
 import { hideBin } from 'yargs/helpers';
 import debug from 'debug';
-import { getDefaultProvider } from 'ethers';
 
 import { getCache } from '@vulcanize/cache';
 import { EthClient } from '@vulcanize/ipld-eth-client';
@@ -18,7 +17,8 @@ import {
   QUEUE_BLOCK_PROCESSING,
   QUEUE_EVENT_PROCESSING,
   JobQueueConfig,
-  DEFAULT_CONFIG_PATH
+  DEFAULT_CONFIG_PATH,
+  getCustomProvider
 } from '@vulcanize/util';
 
 import { Indexer } from './indexer';
@@ -106,7 +106,7 @@ export const main = async (): Promise<any> => {
     cache
   });
 
-  const ethProvider = getDefaultProvider(rpcProviderEndpoint);
+  const ethProvider = getCustomProvider(rpcProviderEndpoint);
   const indexer = new Indexer(db, ethClient, postgraphileClient, ethProvider);
 
   assert(jobQueueConfig, 'Missing job queue config');
diff --git a/packages/codegen/src/templates/server-template.handlebars b/packages/codegen/src/templates/server-template.handlebars
index ed588f74..80817762 100644
--- a/packages/codegen/src/templates/server-template.handlebars
+++ b/packages/codegen/src/templates/server-template.handlebars
@@ -13,11 +13,10 @@ import { hideBin } from 'yargs/helpers';
 import debug from 'debug';
 import 'graphql-import-node';
 import { createServer } from 'http';
-import { getDefaultProvider } from 'ethers';
 
 import { getCache } from '@vulcanize/cache';
 import { EthClient } from '@vulcanize/ipld-eth-client';
-import { DEFAULT_CONFIG_PATH, getConfig, JobQueue, KIND_ACTIVE } from '@vulcanize/util';
+import { DEFAULT_CONFIG_PATH, getConfig, JobQueue, KIND_ACTIVE, getCustomProvider } from '@vulcanize/util';
 
 import { createResolvers } from './resolvers';
 import { Indexer } from './indexer';
@@ -68,7 +67,7 @@ export const main = async (): Promise<any> => {
     cache
   });
 
-  const ethProvider = getDefaultProvider(rpcProviderEndpoint);
+  const ethProvider = getCustomProvider(rpcProviderEndpoint);
 
   const indexer = new Indexer(db, ethClient, postgraphileClient, ethProvider);
 
diff --git a/packages/erc20-watcher/src/fill.ts b/packages/erc20-watcher/src/fill.ts
index 21ce258d..dbb098a7 100644
--- a/packages/erc20-watcher/src/fill.ts
+++ b/packages/erc20-watcher/src/fill.ts
@@ -8,11 +8,10 @@ import yargs from 'yargs';
 import { hideBin } from 'yargs/helpers';
 import debug from 'debug';
 import { PubSub } from 'apollo-server-express';
-import { getDefaultProvider } from 'ethers';
 
 import { getCache } from '@vulcanize/cache';
 import { EthClient } from '@vulcanize/ipld-eth-client';
-import { getConfig, fillBlocks, JobQueue, DEFAULT_CONFIG_PATH } from '@vulcanize/util';
+import { getConfig, fillBlocks, JobQueue, DEFAULT_CONFIG_PATH, getCustomProvider } from '@vulcanize/util';
 
 import { Database } from './database';
 import { Indexer } from './indexer';
@@ -68,7 +67,7 @@ export const main = async (): Promise<any> => {
     cache
   });
 
-  const ethProvider = getDefaultProvider(rpcProviderEndpoint);
+  const ethProvider = getCustomProvider(rpcProviderEndpoint);
 
   // Note: In-memory pubsub works fine for now, as each watcher is a single process anyway.
   // Later: https://www.apollographql.com/docs/apollo-server/data/subscriptions/#production-pubsub-libraries
diff --git a/packages/erc20-watcher/src/indexer.ts b/packages/erc20-watcher/src/indexer.ts
index ea195ea5..b4e4ce12 100644
--- a/packages/erc20-watcher/src/indexer.ts
+++ b/packages/erc20-watcher/src/indexer.ts
@@ -90,7 +90,7 @@ export class Indexer {
     let result: ValueResult;
 
     if (this._serverMode === ETH_CALL_MODE) {
-      const value = await fetchTokenTotalSupply(this._ethProvider, token);
+      const value = await fetchTokenTotalSupply(this._ethProvider, blockHash, token);
 
       result = { value };
     } else {
@@ -179,7 +179,7 @@ export class Indexer {
     let result: ValueResult;
 
     if (this._serverMode === ETH_CALL_MODE) {
-      const value = await fetchTokenName(this._ethProvider, token);
+      const value = await fetchTokenName(this._ethProvider, blockHash, token);
 
       result = { value };
     } else {
@@ -195,7 +195,7 @@ export class Indexer {
     let result: ValueResult;
 
     if (this._serverMode === ETH_CALL_MODE) {
-      const value = await fetchTokenSymbol(this._ethProvider, token);
+      const value = await fetchTokenSymbol(this._ethProvider, blockHash, token);
 
       result = { value };
     } else {
@@ -211,7 +211,7 @@ export class Indexer {
     let result: ValueResult;
 
     if (this._serverMode === ETH_CALL_MODE) {
-      const value = await fetchTokenDecimals(this._ethProvider, token);
+      const value = await fetchTokenDecimals(this._ethProvider, blockHash, token);
 
       result = { value };
     } else {
diff --git a/packages/erc20-watcher/src/job-runner.ts b/packages/erc20-watcher/src/job-runner.ts
index aa68e8fd..4c272b63 100644
--- a/packages/erc20-watcher/src/job-runner.ts
+++ b/packages/erc20-watcher/src/job-runner.ts
@@ -7,7 +7,6 @@ import 'reflect-metadata';
 import yargs from 'yargs';
 import { hideBin } from 'yargs/helpers';
 import debug from 'debug';
-import { getDefaultProvider } from 'ethers';
 
 import { getCache } from '@vulcanize/cache';
 import { EthClient } from '@vulcanize/ipld-eth-client';
@@ -18,7 +17,8 @@ import {
   QUEUE_BLOCK_PROCESSING,
   QUEUE_EVENT_PROCESSING,
   JobQueueConfig,
-  DEFAULT_CONFIG_PATH
+  DEFAULT_CONFIG_PATH,
+  getCustomProvider
 } from '@vulcanize/util';
 
 import { Indexer } from './indexer';
@@ -100,7 +100,7 @@ export const main = async (): Promise<any> => {
     cache
   });
 
-  const ethProvider = getDefaultProvider(rpcProviderEndpoint);
+  const ethProvider = getCustomProvider(rpcProviderEndpoint);
   const indexer = new Indexer(db, ethClient, ethProvider, mode);
 
   assert(jobQueueConfig, 'Missing job queue config');
diff --git a/packages/erc20-watcher/src/server.ts b/packages/erc20-watcher/src/server.ts
index 9c9a992e..c4a6cd89 100644
--- a/packages/erc20-watcher/src/server.ts
+++ b/packages/erc20-watcher/src/server.ts
@@ -11,11 +11,10 @@ import { hideBin } from 'yargs/helpers';
 import debug from 'debug';
 import 'graphql-import-node';
 import { createServer } from 'http';
-import { getDefaultProvider } from 'ethers';
 
 import { getCache } from '@vulcanize/cache';
 import { EthClient } from '@vulcanize/ipld-eth-client';
-import { DEFAULT_CONFIG_PATH, getConfig, JobQueue, KIND_ACTIVE } from '@vulcanize/util';
+import { DEFAULT_CONFIG_PATH, getConfig, getCustomProvider, JobQueue, KIND_ACTIVE } from '@vulcanize/util';
 
 import typeDefs from './schema';
 
@@ -63,7 +62,7 @@ export const main = async (): Promise<any> => {
     cache
   });
 
-  const ethProvider = getDefaultProvider(rpcProviderEndpoint);
+  const ethProvider = getCustomProvider(rpcProviderEndpoint);
 
   // Note: In-memory pubsub works fine for now, as each watcher is a single process anyway.
   // Later: https://www.apollographql.com/docs/apollo-server/data/subscriptions/#production-pubsub-libraries
diff --git a/packages/erc20-watcher/src/utils/index.ts b/packages/erc20-watcher/src/utils/index.ts
index 16797629..7ca865b4 100644
--- a/packages/erc20-watcher/src/utils/index.ts
+++ b/packages/erc20-watcher/src/utils/index.ts
@@ -10,18 +10,18 @@ import ERC20SymbolBytesABI from '../artifacts/ERC20SymbolBytes.json';
 import ERC20NameBytesABI from '../artifacts/ERC20NameBytes.json';
 import { StaticTokenDefinition } from './static-token-definition';
 
-export const fetchTokenSymbol = async (ethProvider: BaseProvider, tokenAddress: string): Promise<string> => {
+export const fetchTokenSymbol = async (ethProvider: BaseProvider, blockHash: string, tokenAddress: string): Promise<string> => {
   const contract = new Contract(tokenAddress, abi, ethProvider);
   const contractSymbolBytes = new Contract(tokenAddress, ERC20SymbolBytesABI, ethProvider);
   let symbolValue = 'unknown';
 
   // Try types string and bytes32 for symbol.
   try {
-    const result = await contract.symbol();
+    const result = await contract.symbol({ blockTag: blockHash });
     symbolValue = result;
   } catch (error) {
     try {
-      const result = await contractSymbolBytes.symbol();
+      const result = await contractSymbolBytes.symbol({ blockTag: blockHash });
 
       // For broken pairs that have no symbol function exposed.
       if (!isNullEthValue(result)) {
@@ -42,18 +42,18 @@ export const fetchTokenSymbol = async (ethProvider: BaseProvider, tokenAddress:
   return symbolValue;
 };
 
-export const fetchTokenName = async (ethProvider: BaseProvider, tokenAddress: string): Promise<string> => {
+export const fetchTokenName = async (ethProvider: BaseProvider, blockHash: string, tokenAddress: string): Promise<string> => {
   const contract = new Contract(tokenAddress, abi, ethProvider);
   const contractNameBytes = new Contract(tokenAddress, ERC20NameBytesABI, ethProvider);
   let nameValue = 'unknown';
 
   // Try types string and bytes32 for name.
   try {
-    const result = await contract.name();
+    const result = await contract.name({ blockTag: blockHash });
     nameValue = result;
   } catch (error) {
     try {
-      const result = await contractNameBytes.name();
+      const result = await contractNameBytes.name({ blockTag: blockHash });
 
       // For broken pairs that have no name function exposed.
       if (!isNullEthValue(result)) {
@@ -74,12 +74,12 @@ export const fetchTokenName = async (ethProvider: BaseProvider, tokenAddress: st
   return nameValue;
 };
 
-export const fetchTokenTotalSupply = async (ethProvider: BaseProvider, tokenAddress: string): Promise<bigint> => {
+export const fetchTokenTotalSupply = async (ethProvider: BaseProvider, blockHash: string, tokenAddress: string): Promise<bigint> => {
   const contract = new Contract(tokenAddress, abi, ethProvider);
   let totalSupplyValue = null;
 
   try {
-    const result = await contract.totalSupply();
+    const result = await contract.totalSupply({ blockTag: blockHash });
     totalSupplyValue = result.toString();
   } catch (error) {
     totalSupplyValue = 0;
@@ -88,14 +88,14 @@ export const fetchTokenTotalSupply = async (ethProvider: BaseProvider, tokenAddr
   return BigInt(totalSupplyValue);
 };
 
-export const fetchTokenDecimals = async (ethProvider: BaseProvider, tokenAddress: string): Promise<bigint> => {
+export const fetchTokenDecimals = async (ethProvider: BaseProvider, blockHash: string, tokenAddress: string): Promise<bigint> => {
   const contract = new Contract(tokenAddress, abi, ethProvider);
 
   // Try types uint8 for decimals.
   let decimalValue = null;
 
   try {
-    const result = await contract.decimals();
+    const result = await contract.decimals({ blockTag: blockHash });
     decimalValue = result.toString();
   } catch (error) {
     // Try with the static definition.
diff --git a/packages/uni-info-watcher/src/fill.ts b/packages/uni-info-watcher/src/fill.ts
index 2edc88cd..09cce804 100644
--- a/packages/uni-info-watcher/src/fill.ts
+++ b/packages/uni-info-watcher/src/fill.ts
@@ -7,11 +7,10 @@ import 'reflect-metadata';
 import yargs from 'yargs';
 import { hideBin } from 'yargs/helpers';
 import debug from 'debug';
-import { getDefaultProvider } from 'ethers';
 
 import { getCache } from '@vulcanize/cache';
 import { EthClient } from '@vulcanize/ipld-eth-client';
-import { getConfig, fillBlocks, JobQueue, DEFAULT_CONFIG_PATH } from '@vulcanize/util';
+import { getConfig, fillBlocks, JobQueue, DEFAULT_CONFIG_PATH, getCustomProvider } from '@vulcanize/util';
 import { Client as UniClient } from '@vulcanize/uni-watcher';
 import { Client as ERC20Client } from '@vulcanize/erc20-watcher';
 
@@ -72,7 +71,7 @@ export const main = async (): Promise<any> => {
 
   const uniClient = new UniClient(uniWatcher);
   const erc20Client = new ERC20Client(tokenWatcher);
-  const ethProvider = getDefaultProvider(rpcProviderEndpoint);
+  const ethProvider = getCustomProvider(rpcProviderEndpoint);
 
   // Note: In-memory pubsub works fine for now, as each watcher is a single process anyway.
   // Later: https://www.apollographql.com/docs/apollo-server/data/subscriptions/#production-pubsub-libraries
diff --git a/packages/uni-info-watcher/src/job-runner.ts b/packages/uni-info-watcher/src/job-runner.ts
index 77149d3b..1c8d1e00 100644
--- a/packages/uni-info-watcher/src/job-runner.ts
+++ b/packages/uni-info-watcher/src/job-runner.ts
@@ -7,7 +7,6 @@ import 'reflect-metadata';
 import yargs from 'yargs';
 import { hideBin } from 'yargs/helpers';
 import debug from 'debug';
-import { getDefaultProvider } from 'ethers';
 
 import { Client as ERC20Client } from '@vulcanize/erc20-watcher';
 import { Client as UniClient } from '@vulcanize/uni-watcher';
@@ -20,7 +19,8 @@ import {
   QUEUE_EVENT_PROCESSING,
   JobRunner as BaseJobRunner,
   JobQueueConfig,
-  DEFAULT_CONFIG_PATH
+  DEFAULT_CONFIG_PATH,
+  getCustomProvider
 } from '@vulcanize/util';
 
 import { Indexer } from './indexer';
@@ -122,7 +122,7 @@ export const main = async (): Promise<any> => {
   });
 
   const erc20Client = new ERC20Client(tokenWatcher);
-  const ethProvider = getDefaultProvider(rpcProviderEndpoint);
+  const ethProvider = getCustomProvider(rpcProviderEndpoint);
 
   const indexer = new Indexer(db, uniClient, erc20Client, ethClient, ethProvider, mode);
 
diff --git a/packages/uni-info-watcher/src/server.ts b/packages/uni-info-watcher/src/server.ts
index c15d38ea..f9c78808 100644
--- a/packages/uni-info-watcher/src/server.ts
+++ b/packages/uni-info-watcher/src/server.ts
@@ -11,12 +11,11 @@ import { hideBin } from 'yargs/helpers';
 import debug from 'debug';
 import 'graphql-import-node';
 import { createServer } from 'http';
-import { getDefaultProvider } from 'ethers';
 
 import { Client as ERC20Client } from '@vulcanize/erc20-watcher';
 import { Client as UniClient } from '@vulcanize/uni-watcher';
 import { EthClient } from '@vulcanize/ipld-eth-client';
-import { DEFAULT_CONFIG_PATH, getConfig, JobQueue } from '@vulcanize/util';
+import { DEFAULT_CONFIG_PATH, getConfig, getCustomProvider, JobQueue } from '@vulcanize/util';
 import { getCache } from '@vulcanize/cache';
 
 import typeDefs from './schema';
@@ -77,7 +76,7 @@ export const main = async (): Promise<any> => {
 
   const uniClient = new UniClient(uniWatcher);
   const erc20Client = new ERC20Client(tokenWatcher);
-  const ethProvider = getDefaultProvider(rpcProviderEndpoint);
+  const ethProvider = getCustomProvider(rpcProviderEndpoint);
   const indexer = new Indexer(db, uniClient, erc20Client, ethClient, ethProvider, mode);
 
   assert(jobQueueConfig, 'Missing job queue config');
diff --git a/packages/uni-watcher/src/chain-pruning.test.ts b/packages/uni-watcher/src/chain-pruning.test.ts
index 1400232b..95d1e8a2 100644
--- a/packages/uni-watcher/src/chain-pruning.test.ts
+++ b/packages/uni-watcher/src/chain-pruning.test.ts
@@ -6,9 +6,8 @@ import { expect, assert } from 'chai';
 import { AssertionError } from 'assert';
 import 'mocha';
 import _ from 'lodash';
-import { getDefaultProvider } from 'ethers';
 
-import { getConfig, JobQueue, JobRunner, JOB_KIND_PRUNE } from '@vulcanize/util';
+import { getConfig, getCustomProvider, JobQueue, JobRunner, JOB_KIND_PRUNE } from '@vulcanize/util';
 import { getCache } from '@vulcanize/cache';
 import { EthClient } from '@vulcanize/ipld-eth-client';
 import { insertNDummyBlocks, removeEntities } from '@vulcanize/util/test';
@@ -62,7 +61,7 @@ describe('chain pruning', () => {
       cache
     });
 
-    const ethProvider = getDefaultProvider(rpcProviderEndpoint);
+    const ethProvider = getCustomProvider(rpcProviderEndpoint);
 
     indexer = new Indexer(db, ethClient, postgraphileClient, ethProvider);
     assert(indexer, 'Could not create indexer object.');
diff --git a/packages/uni-watcher/src/fill.ts b/packages/uni-watcher/src/fill.ts
index 10f7e6b3..70b38fd5 100644
--- a/packages/uni-watcher/src/fill.ts
+++ b/packages/uni-watcher/src/fill.ts
@@ -8,11 +8,10 @@ import yargs from 'yargs';
 import { hideBin } from 'yargs/helpers';
 import debug from 'debug';
 import { PubSub } from 'apollo-server-express';
-import { getDefaultProvider } from 'ethers';
 
 import { getCache } from '@vulcanize/cache';
 import { EthClient } from '@vulcanize/ipld-eth-client';
-import { getConfig, fillBlocks, JobQueue, DEFAULT_CONFIG_PATH } from '@vulcanize/util';
+import { getConfig, fillBlocks, JobQueue, DEFAULT_CONFIG_PATH, getCustomProvider } from '@vulcanize/util';
 
 import { Database } from './database';
 import { Indexer } from './indexer';
@@ -73,7 +72,7 @@ export const main = async (): Promise<any> => {
     cache
   });
 
-  const ethProvider = getDefaultProvider(rpcProviderEndpoint);
+  const ethProvider = getCustomProvider(rpcProviderEndpoint);
 
   // Note: In-memory pubsub works fine for now, as each watcher is a single process anyway.
   // Later: https://www.apollographql.com/docs/apollo-server/data/subscriptions/#production-pubsub-libraries
diff --git a/packages/uni-watcher/src/job-runner.ts b/packages/uni-watcher/src/job-runner.ts
index 2a793ef0..9f4c2f80 100644
--- a/packages/uni-watcher/src/job-runner.ts
+++ b/packages/uni-watcher/src/job-runner.ts
@@ -7,7 +7,6 @@ import 'reflect-metadata';
 import yargs from 'yargs';
 import { hideBin } from 'yargs/helpers';
 import debug from 'debug';
-import { getDefaultProvider } from 'ethers';
 
 import { getCache } from '@vulcanize/cache';
 import { EthClient } from '@vulcanize/ipld-eth-client';
@@ -18,7 +17,8 @@ import {
   QUEUE_BLOCK_PROCESSING,
   QUEUE_EVENT_PROCESSING,
   JobQueueConfig,
-  DEFAULT_CONFIG_PATH
+  DEFAULT_CONFIG_PATH,
+  getCustomProvider
 } from '@vulcanize/util';
 
 import { Indexer } from './indexer';
@@ -122,7 +122,7 @@ export const main = async (): Promise<any> => {
     cache
   });
 
-  const ethProvider = getDefaultProvider(rpcProviderEndpoint);
+  const ethProvider = getCustomProvider(rpcProviderEndpoint);
 
   const indexer = new Indexer(db, ethClient, postgraphileClient, ethProvider);
 
diff --git a/packages/uni-watcher/src/server.ts b/packages/uni-watcher/src/server.ts
index 9b72972f..463591a2 100644
--- a/packages/uni-watcher/src/server.ts
+++ b/packages/uni-watcher/src/server.ts
@@ -11,11 +11,10 @@ import { hideBin } from 'yargs/helpers';
 import debug from 'debug';
 import 'graphql-import-node';
 import { createServer } from 'http';
-import { getDefaultProvider } from 'ethers';
 
 import { getCache } from '@vulcanize/cache';
 import { EthClient } from '@vulcanize/ipld-eth-client';
-import { DEFAULT_CONFIG_PATH, getConfig, JobQueue } from '@vulcanize/util';
+import { DEFAULT_CONFIG_PATH, getConfig, getCustomProvider, JobQueue } from '@vulcanize/util';
 
 import typeDefs from './schema';
 
@@ -68,7 +67,7 @@ export const main = async (): Promise<any> => {
     cache
   });
 
-  const ethProvider = getDefaultProvider(rpcProviderEndpoint);
+  const ethProvider = getCustomProvider(rpcProviderEndpoint);
 
   // Note: In-memory pubsub works fine for now, as each watcher is a single process anyway.
   // Later: https://www.apollographql.com/docs/apollo-server/data/subscriptions/#production-pubsub-libraries
diff --git a/packages/util/src/config.ts b/packages/util/src/config.ts
index 02146d7d..0dbdbbd5 100644
--- a/packages/util/src/config.ts
+++ b/packages/util/src/config.ts
@@ -8,12 +8,13 @@ import path from 'path';
 import toml from 'toml';
 import debug from 'debug';
 import { ConnectionOptions } from 'typeorm';
-import { getDefaultProvider } from 'ethers';
 
 import { BaseProvider } from '@ethersproject/providers';
 import { Config as CacheConfig, getCache } from '@vulcanize/cache';
 import { EthClient } from '@vulcanize/ipld-eth-client';
 
+import { getCustomProvider } from './index';
+
 const log = debug('vulcanize:config');
 
 export interface JobQueueConfig {
@@ -99,7 +100,7 @@ export const getResetConfig = async (config: Config): Promise<{
     cache
   });
 
-  const ethProvider = getDefaultProvider(rpcProviderEndpoint);
+  const ethProvider = getCustomProvider(rpcProviderEndpoint);
 
   return {
     dbConfig,
diff --git a/packages/util/src/index.ts b/packages/util/src/index.ts
index 5bf59da0..bab67ee7 100644
--- a/packages/util/src/index.ts
+++ b/packages/util/src/index.ts
@@ -7,6 +7,7 @@ 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 { DEFAULT_CONFIG_PATH } from './constants';
 import { Config } from './config';
@@ -84,3 +85,32 @@ export const getResetYargs = (): yargs.Argv => {
       }
     });
 };
+
+export const getCustomProvider = (network?: providers.Network | string, options?: any): providers.BaseProvider => {
+  const provider = getDefaultProvider(network, options);
+  provider.formatter = new CustomFormatter();
+  return provider;
+};
+
+class CustomFormatter extends providers.Formatter {
+  blockTag (blockTag: any): string {
+    if (blockTag == null) { return 'latest'; }
+
+    if (blockTag === 'earliest') { return '0x0'; }
+
+    if (blockTag === 'latest' || blockTag === 'pending') {
+      return blockTag;
+    }
+
+    if (typeof (blockTag) === 'number' || utils.isHexString(blockTag)) {
+      // Return value if hex string is of block hash length.
+      if (utils.isHexString(blockTag) && utils.hexDataLength(blockTag) === 32) {
+        return blockTag;
+      }
+
+      return utils.hexValue(<number | string>blockTag);
+    }
+
+    throw new Error('invalid blockTag');
+  }
+}