diff --git a/src/wallet/utils/TxError.ts b/src/wallet/utils/TxError.ts
new file mode 100644
index 00000000..d1291497
--- /dev/null
+++ b/src/wallet/utils/TxError.ts
@@ -0,0 +1,31 @@
+// custom class to allow dApps to handle errors in a more user-friendly way
+export class TxError extends Error {
+    private data: any;
+
+    constructor(message: string, data: any = null) {
+        super(message);
+        this.data = data;
+    }
+
+    public static async normalize<T>(promise: Promise<T>): Promise<T> {
+        try {
+            return await promise;
+        } catch (err) {
+            if (typeof err === "string") {
+              throw new TxError(err);
+            }
+            if (err instanceof Error) {
+              throw err as TxError;
+            }
+            throw new TxError("Unknown error", err);
+        }
+    }
+
+    public getMessage(): string {
+        return this.message;
+    }
+
+    public getData(): any {
+        return this.data;
+    }
+}
\ No newline at end of file
diff --git a/src/wallet/wallets/keplr/KeplrExtension.ts b/src/wallet/wallets/keplr/KeplrExtension.ts
index 241f273e..dde4a3fb 100644
--- a/src/wallet/wallets/keplr/KeplrExtension.ts
+++ b/src/wallet/wallets/keplr/KeplrExtension.ts
@@ -20,6 +20,7 @@ import {
   SignArbitraryResponse,
   UnsignedTx,
 } from "../ConnectedWallet";
+import { TxError } from "cosmes/wallet/utils/TxError";
 
 export class KeplrExtension extends ConnectedWallet {
   private readonly ext: Keplr;
@@ -55,7 +56,7 @@ export class KeplrExtension extends ConnectedWallet {
   }
 
   public async signArbitrary(data: string): Promise<SignArbitraryResponse> {
-    const res = await this.normaliseError(
+    const res = await TxError.normalize(
       this.ext.signArbitrary(this.chainId, this.address, data)
     );
     return {
@@ -86,12 +87,12 @@ export class KeplrExtension extends ConnectedWallet {
     };
     let txRaw: TxRaw;
     if (this.useAmino) {
-      const { signed, signature } = await this.normaliseError(
+      const { signed, signature } = await TxError.normalize(
         this.ext.signAmino(this.chainId, this.address, tx.toStdSignDoc(params))
       );
       txRaw = tx.toSignedAmino(signed, signature.signature);
     } else {
-      const { signed, signature } = await this.normaliseError(
+      const { signed, signature } = await TxError.normalize(
         this.ext.signDirect(this.chainId, this.address, tx.toSignDoc(params))
       );
       txRaw = tx.toSignedDirect(signed, signature.signature);
@@ -99,25 +100,4 @@ export class KeplrExtension extends ConnectedWallet {
 
     return RpcClient.broadcastTx(this.rpc, txRaw);
   }
-
-  /**
-   * Returns the result of the `promise` if it resolves successfully, normalising
-   * any errors thrown into a standard `Error` instance.
-   *
-   * It is best to wrap all wallet API calls with this function as some wallets
-   * throw raw strings instead of actual `Error` instances.
-   */
-  private async normaliseError<T>(promise: Promise<T>): Promise<T> {
-    try {
-      return await promise;
-    } catch (err) {
-      if (typeof err === "string") {
-        throw new Error(err);
-      }
-      if (err instanceof Error) {
-        throw err;
-      }
-      throw new Error("Unknown error: " + JSON.stringify(err));
-    }
-  }
-}
+}
\ No newline at end of file