diff --git a/src/contractClients/acpContractClient.ts b/src/contractClients/acpContractClient.ts
index 1f8d676..4af3794 100644
--- a/src/contractClients/acpContractClient.ts
+++ b/src/contractClients/acpContractClient.ts
@@ -386,6 +386,10 @@ class AcpContractClient extends BaseAcpContractClient {
     return this.sessionKeyClient.signTypedData({ typedData });
   }
 
+  async signMessage(message: string): Promise<Hex> {
+    return await this.sessionKeyClient.signMessage({ message });
+  }
+
   async sendTransaction(request: TransactionRequest): Promise<Hex> {
     return await this.sessionKeyClient.sendTransaction(request, {
       paymasterAndData: "0x",
diff --git a/src/contractClients/acpContractClientV2.ts b/src/contractClients/acpContractClientV2.ts
index 374116d..d3bcdd4 100644
--- a/src/contractClients/acpContractClientV2.ts
+++ b/src/contractClients/acpContractClientV2.ts
@@ -383,6 +383,10 @@ class AcpContractClientV2 extends BaseAcpContractClient {
     return await this.sessionKeyClient.signTypedData({ typedData });
   }
 
+  async signMessage(message: string): Promise<Hex> {
+    return await this.sessionKeyClient.signMessage({ message });
+  }
+
   async sendTransaction(request: TransactionRequest): Promise<Hex> {
     return await this.sessionKeyClient.sendTransaction(request, {
       paymasterAndData: "0x",
diff --git a/src/contractClients/baseAcpContractClient.ts b/src/contractClients/baseAcpContractClient.ts
index 89785ca..b5232ad 100644
--- a/src/contractClients/baseAcpContractClient.ts
+++ b/src/contractClients/baseAcpContractClient.ts
@@ -605,6 +605,8 @@ abstract class BaseAcpContractClient {
 
   abstract signTypedData(typedData: SignTypedDataParameters): Promise<Hex>;
 
+  abstract signMessage(message: string): Promise<Hex>;
+
   abstract sendTransaction(request: TransactionRequest): Promise<Hex>;
 }