diff --git a/features/keychain/api/index.d.ts b/features/keychain/api/index.d.ts
index 79d1519..216b2da 100644
--- a/features/keychain/api/index.d.ts
+++ b/features/keychain/api/index.d.ts
@@ -37,6 +37,7 @@ export interface KeychainApi {
     signBuffer(params: { data: Buffer } & KeySource): Promise<Buffer>
     signBuffer(params: { data: Buffer; enc: 'der' } & KeySource): Promise<Buffer>
     signSchnorr(params: { data: Buffer; tweak?: Buffer } & KeySource): Promise<Buffer>
+    signSchnorrZ(params: { data: Buffer } & KeySource): Promise<Buffer>
   }
 }
 
diff --git a/features/keychain/api/index.js b/features/keychain/api/index.js
index ce82827..8706ade 100644
--- a/features/keychain/api/index.js
+++ b/features/keychain/api/index.js
@@ -19,6 +19,7 @@ const createKeychainApi = ({ keychain }) => {
       secp256k1: {
         signBuffer: keychain.secp256k1.signBuffer,
         signSchnorr: keychain.secp256k1.signSchnorr,
+        signSchnorrZ: keychain.secp256k1.signSchnorrZ,
       },
     },
   }