diff --git a/packages/proto-signing/src/index.ts b/packages/proto-signing/src/index.ts
index ebc91f1a..2585de8f 100644
--- a/packages/proto-signing/src/index.ts
+++ b/packages/proto-signing/src/index.ts
@@ -3,5 +3,5 @@ export { cosmosField } from "./decorator";
 export { Registry } from "./registry";
 export { DirectSecp256k1Wallet } from "./directsecp256k1wallet";
 export { decodePubkey, encodePubkey } from "./pubkey";
-export { OfflineDirectSigner, OfflineSigner } from "./signer";
+export { isOfflineDirectSigner, OfflineDirectSigner, OfflineSigner } from "./signer";
 export { makeAuthInfoBytes, makeSignBytes, makeSignDoc } from "./signing";
diff --git a/packages/proto-signing/src/signer.ts b/packages/proto-signing/src/signer.ts
index a5aca75b..424eeae8 100644
--- a/packages/proto-signing/src/signer.ts
+++ b/packages/proto-signing/src/signer.ts
@@ -20,3 +20,7 @@ export interface OfflineDirectSigner {
 }
 
 export type OfflineSigner = OfflineAminoSigner | OfflineDirectSigner;
+
+export function isOfflineDirectSigner(signer: OfflineSigner): signer is OfflineDirectSigner {
+  return (signer as any).signDirect !== undefined;
+}
diff --git a/packages/proto-signing/types/index.d.ts b/packages/proto-signing/types/index.d.ts
index ebc91f1a..2585de8f 100644
--- a/packages/proto-signing/types/index.d.ts
+++ b/packages/proto-signing/types/index.d.ts
@@ -3,5 +3,5 @@ export { cosmosField } from "./decorator";
 export { Registry } from "./registry";
 export { DirectSecp256k1Wallet } from "./directsecp256k1wallet";
 export { decodePubkey, encodePubkey } from "./pubkey";
-export { OfflineDirectSigner, OfflineSigner } from "./signer";
+export { isOfflineDirectSigner, OfflineDirectSigner, OfflineSigner } from "./signer";
 export { makeAuthInfoBytes, makeSignBytes, makeSignDoc } from "./signing";
diff --git a/packages/proto-signing/types/signer.d.ts b/packages/proto-signing/types/signer.d.ts
index dc2d9e98..2037b89a 100644
--- a/packages/proto-signing/types/signer.d.ts
+++ b/packages/proto-signing/types/signer.d.ts
@@ -16,3 +16,4 @@ export interface OfflineDirectSigner {
   ) => Promise<DirectSignResponse>;
 }
 export declare type OfflineSigner = OfflineAminoSigner | OfflineDirectSigner;
+export declare function isOfflineDirectSigner(signer: OfflineSigner): signer is OfflineDirectSigner;