diff --git a/proto/cerc/auction/v1/auction.proto b/proto/cerc/auction/v1/auction.proto
index 7de8647..4720cc9 100644
--- a/proto/cerc/auction/v1/auction.proto
+++ b/proto/cerc/auction/v1/auction.proto
@@ -53,7 +53,7 @@ message Auction {
 
   string id = 1;
 
-  // Auction's kind (vickrey | service_provider)
+  // Auction's kind (vickrey | provider)
   string kind = 2 [
     (gogoproto.moretags) = "json:\"kind\" yaml:\"kind\""
   ];
@@ -101,7 +101,7 @@ message Auction {
     (gogoproto.moretags) = "json:\"minimum_bid\" yaml:\"minimum_bid\""
   ];
 
-  // Addresses of the winners (one for vickrey and can be multiple for service_provider)
+  // Addresses of the winners (one for vickrey auctions and can be multiple for provider auctions)
   repeated string winner_addresses = 11;
 
   // Winning bids, i.e., the best bids
diff --git a/proto/cerc/auction/v1/tx.proto b/proto/cerc/auction/v1/tx.proto
index ec02f77..b454551 100644
--- a/proto/cerc/auction/v1/tx.proto
+++ b/proto/cerc/auction/v1/tx.proto
@@ -77,7 +77,7 @@ message MsgCreateAuction {
   string signer = 6
       [ (gogoproto.moretags) = "json:\"signer\" yaml:\"signer\"" ];
 
-  // Auction's kind (vickrey | service_provider)
+  // Auction's kind (vickrey | provider)
   string kind = 7 [
     (gogoproto.moretags) = "json:\"kind\" yaml:\"kind\""
   ];
diff --git a/src/auction.test.ts b/src/auction.test.ts
index 0278b00..1f743df 100644
--- a/src/auction.test.ts
+++ b/src/auction.test.ts
@@ -71,7 +71,6 @@ const createAuctionTests = () => {
       commitFee,
       revealFee,
       minimumBid,
-      kind: 'vickrey',
       signer: auctionCreatorAccount.address
     },
     auctionCreatorAccount.privateKey, fee);
@@ -174,13 +173,12 @@ const createSPAuctionTests = () => {
       amount: '100000000'
     };
 
-    const auction = await registry.createServiceProviderAuction({
+    const auction = await registry.createProviderAuction({
       commitsDuration,
       revealsDuration,
       commitFee,
       revealFee,
       signer: auctionCreatorAccount.address,
-      kind: 'service_provider',
       maxPrice,
       numProviders: 3
     },
diff --git a/src/index.ts b/src/index.ts
index 8e2d825..b172584 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -23,6 +23,7 @@ import {
 import {
   MessageMsgCommitBid,
   MessageMsgRevealBid,
+  MsgCreateProviderAuction,
   MsgCreateVickreyAuction
 } from './types/cerc/auction/message';
 import { MessageMsgSendCoins } from './types/cosmos/bank/message';
@@ -508,8 +509,7 @@ export class Registry {
     commitFee,
     revealFee,
     minimumBid,
-    signer,
-    kind
+    signer
   }: MsgCreateVickreyAuction,
   privateKey: string,
   fee: StdFee | number = DEFAULT_GAS_ESTIMATION_MULTIPLIER): Promise<MsgCreateAuctionResponse> {
@@ -524,7 +524,7 @@ export class Registry {
       revealFee,
       minimumBid,
       signer,
-      kind,
+      'vickrey',
       undefined,
       0,
       fee,
@@ -532,16 +532,15 @@ export class Registry {
     );
   }
 
-  async createServiceProviderAuction ({
+  async createProviderAuction ({
     commitsDuration,
     revealsDuration,
     commitFee,
     revealFee,
     signer,
-    kind,
     maxPrice,
     numProviders
-  }: MsgCreateAuction,
+  }: MsgCreateProviderAuction,
   privateKey: string,
   fee: StdFee | number = DEFAULT_GAS_ESTIMATION_MULTIPLIER): Promise<MsgCreateAuctionResponse> {
     const account = new Account(Buffer.from(privateKey, 'hex'));
@@ -555,7 +554,7 @@ export class Registry {
       revealFee,
       undefined,
       signer,
-      kind,
+      'provider',
       maxPrice,
       numProviders,
       fee,
diff --git a/src/proto/cerc/auction/v1/auction.ts b/src/proto/cerc/auction/v1/auction.ts
index ce70564..d9c7c8e 100644
--- a/src/proto/cerc/auction/v1/auction.ts
+++ b/src/proto/cerc/auction/v1/auction.ts
@@ -24,7 +24,7 @@ export interface Params {
 /** Auction represents a sealed-bid on-chain auction */
 export interface Auction {
   id: string;
-  /** Auction's kind (vickrey | service_provider) */
+  /** Auction's kind (vickrey | provider) */
   kind: string;
   status: string;
   /** Address of the creator of the auction */
@@ -43,7 +43,7 @@ export interface Auction {
   revealFee?: Coin;
   /** Minimum acceptable bid amount for a valid commit */
   minimumBid?: Coin;
-  /** Addresses of the winners (one for vickrey and can be multiple for service_provider) */
+  /** Addresses of the winners (one for vickrey auctions and can be multiple for provider auctions) */
   winnerAddresses: string[];
   /** Winning bids, i.e., the best bids */
   winningBids: Coin[];
diff --git a/src/proto/cerc/auction/v1/tx.ts b/src/proto/cerc/auction/v1/tx.ts
index 0e5bc74..c576c51 100644
--- a/src/proto/cerc/auction/v1/tx.ts
+++ b/src/proto/cerc/auction/v1/tx.ts
@@ -21,7 +21,7 @@ export interface MsgCreateAuction {
   minimumBid?: Coin;
   /** Address of the signer */
   signer: string;
-  /** Auction's kind (vickrey | service_provider) */
+  /** Auction's kind (vickrey | provider) */
   kind: string;
   /** Maximum acceptable bid amount (for service provider auctions) */
   maxPrice?: Coin;
diff --git a/src/types/cerc/auction/message.ts b/src/types/cerc/auction/message.ts
index a620cb1..72ac7d8 100644
--- a/src/types/cerc/auction/message.ts
+++ b/src/types/cerc/auction/message.ts
@@ -46,11 +46,20 @@ export interface MessageMsgRevealBid {
 }
 
 export interface MsgCreateVickreyAuction {
-  commitsDuration?: Duration;
-  revealsDuration?: Duration;
-  commitFee?: Coin;
-  revealFee?: Coin;
-  minimumBid?: Coin;
+  commitsDuration: Duration;
+  revealsDuration: Duration;
+  commitFee: Coin;
+  revealFee: Coin;
+  minimumBid: Coin;
+  signer: string;
+}
+
+export interface MsgCreateProviderAuction {
+  commitsDuration: Duration;
+  revealsDuration: Duration;
+  commitFee: Coin;
+  revealFee: Coin;
+  maxPrice: Coin;
+  numProviders: number;
   signer: string;
-  kind: string;
 }