diff --git a/packages/core-sdk/src/erc1155/mixin.ts b/packages/core-sdk/src/erc1155/mixin.ts
index 4b2807188..5566a6386 100644
--- a/packages/core-sdk/src/erc1155/mixin.ts
+++ b/packages/core-sdk/src/erc1155/mixin.ts
@@ -7,7 +7,7 @@ export class ERC1155Mixin extends BaseCoreSDK {
   /* -------------------------------------------------------------------------- */
   public async erc1155BalanceOf(
     args: Omit<Parameters<typeof balanceOf>[0], "web3Lib">
-  ): Promise<ReturnType<typeof balanceOf>> {
+  ): ReturnType<typeof balanceOf> {
     return balanceOf({ web3Lib: this._web3Lib, ...args });
   }
 }
diff --git a/packages/core-sdk/src/erc20/mixin.ts b/packages/core-sdk/src/erc20/mixin.ts
index 62f79fd5c..69f3c7779 100644
--- a/packages/core-sdk/src/erc20/mixin.ts
+++ b/packages/core-sdk/src/erc20/mixin.ts
@@ -15,43 +15,43 @@ export class ERC20Mixin extends BaseCoreSDK {
   /* -------------------------------------------------------------------------- */
   public async erc20Approve(
     args: Omit<Parameters<typeof approve>[0], "web3Lib">
-  ): Promise<ReturnType<typeof approve>> {
+  ): ReturnType<typeof approve> {
     return approve({ web3Lib: this._web3Lib, ...args });
   }
 
   public async erc20GetAllowance(
     args: Omit<Parameters<typeof getAllowance>[0], "web3Lib">
-  ): Promise<ReturnType<typeof getAllowance>> {
+  ): ReturnType<typeof getAllowance> {
     return getAllowance({ web3Lib: this._web3Lib, ...args });
   }
 
   public async erc20GetDecimals(
     args: Omit<Parameters<typeof getDecimals>[0], "web3Lib">
-  ): Promise<ReturnType<typeof getDecimals>> {
+  ): ReturnType<typeof getDecimals> {
     return getDecimals({ web3Lib: this._web3Lib, ...args });
   }
 
   public async erc20GetSymbol(
     args: Omit<Parameters<typeof getSymbol>[0], "web3Lib">
-  ): Promise<ReturnType<typeof getSymbol>> {
+  ): ReturnType<typeof getSymbol> {
     return getSymbol({ web3Lib: this._web3Lib, ...args });
   }
 
   public async erc20GetName(
     args: Omit<Parameters<typeof getName>[0], "web3Lib">
-  ): Promise<ReturnType<typeof getName>> {
+  ): ReturnType<typeof getName> {
     return getName({ web3Lib: this._web3Lib, ...args });
   }
 
   public async erc20EnsureAllowance(
     args: Omit<Parameters<typeof ensureAllowance>[0], "web3Lib">
-  ): Promise<ReturnType<typeof ensureAllowance>> {
+  ): ReturnType<typeof ensureAllowance> {
     return ensureAllowance({ web3Lib: this._web3Lib, ...args });
   }
 
   public async erc20BalanceOf(
     args: Omit<Parameters<typeof balanceOf>[0], "web3Lib">
-  ): Promise<ReturnType<typeof balanceOf>> {
+  ): ReturnType<typeof balanceOf> {
     return balanceOf({ web3Lib: this._web3Lib, ...args });
   }
 }
diff --git a/packages/core-sdk/src/erc721/mixin.ts b/packages/core-sdk/src/erc721/mixin.ts
index 120f8bc64..32ba148c7 100644
--- a/packages/core-sdk/src/erc721/mixin.ts
+++ b/packages/core-sdk/src/erc721/mixin.ts
@@ -7,19 +7,19 @@ export class ERC721Mixin extends BaseCoreSDK {
   /* -------------------------------------------------------------------------- */
   public async erc721BalanceOf(
     args: Omit<Parameters<typeof balanceOf>[0], "web3Lib">
-  ): Promise<ReturnType<typeof balanceOf>> {
+  ): ReturnType<typeof balanceOf> {
     return balanceOf({ web3Lib: this._web3Lib, ...args });
   }
 
   public async erc721OwnerOf(
     args: Omit<Parameters<typeof ownerOf>[0], "web3Lib">
-  ): Promise<ReturnType<typeof ownerOf>> {
+  ): ReturnType<typeof ownerOf> {
     return ownerOf({ web3Lib: this._web3Lib, ...args });
   }
 
   public async erc721TokenOfOwnerByIndex(
     args: Omit<Parameters<typeof tokenOfOwnerByIndex>[0], "web3Lib">
-  ): Promise<ReturnType<typeof tokenOfOwnerByIndex>> {
+  ): ReturnType<typeof tokenOfOwnerByIndex> {
     return tokenOfOwnerByIndex({ web3Lib: this._web3Lib, ...args });
   }
 }