# Sign a Smart Contract Call with Axiome Connect

Axiome Connect allows you to securely **sign smart contract calls** from external applications using either an authorization code or a QR code.

This is useful for integrating web apps, bots, or scripts with your wallet in a secure and interactive way.

***

### **Step 1: Prepare the JSON Payload**

Create a JSON object describing the smart contract call you want to sign. Here's an example for a token swap:

```json
{
  "type": "cosmwasm_execute",
  "network": "axiome-devnet",
  "contract_addr": "axm14hj2tavq8fpesdwxxcu44rty3hh90vhujrvcmstl4zr3txmfvw9sletw5k",
  "funds": [
    {
      "denom": "uaxm",
      "amount": "1000000"
    }
  ],
  "msg": {
    "swap": {
      "input_token": "Token1",
      "input_amount": "1000000",
      "min_output": "800000"
    }
  },
  "memo": "test memo"
}
```

***

### **Step 2: Encode to Base64 and Prefix**

Encode the JSON as a Base64 string (without line breaks or padding), then prefix it with `axiomesign://`.

Example in JavaScript:

```javascript
const payload = { /* your JSON here */ };
const base64 = Buffer.from(JSON.stringify(payload)).toString('base64');
const finalString = `axiomesign://${base64}`;
console.log(finalString);
```

***

### **Step 3: Use Axiome Connect**

You have **two options** to sign the transaction:

#### **Option 1: Paste the string**

Paste the `axiomesign://...` string into the input field of **Axiome Connect** in your Axiome Wallet app (starting from version 2.1.12 in iOS and 2.0.56 in Android)

Press **Connect** — your app will decode the payload and ask you to **sign** the transaction.

***

#### **Option 2: Scan a QR Code**

You can also encode the `axiomesign://...` string into a **QR code** and scan it directly from the Axiome Connect mobile app.

> You can use any QR generator — just make sure the encoded string starts with `axiomesign://` and contains the full base64-encoded payload.

***

**Notes**

* `contract_addr` must be a valid CosmWasm contract address on the selected network.
* `funds` is optional if the contract call doesn’t require tokens.
* `memo` is optional and can be used for tagging or tracking.
* The app will preview the decoded message before signing.