Quick Start

Get gasless transactions working in your game.

1. Create an account

Go to sorted.fund and sign up.

2. Create a project

In the dashboard, create a project. You'll get:

• A Project ID — identifies your game
• A Deposit Address — where you send funds to cover gas

3. Get an API key

Go to API Keys and generate one. Save it — you won't see it again.

sk_sorted_abc123...

4. Add contracts to your allowlist

Go to Allowlist and add your contract addresses and function selectors.

Example for a mint function:

Field	Value
Contract	0xYourContract...
Selector	0x40c10f19

Finding function selectors

The selector is the first 4 bytes of the keccak256 hash of the function signature.

// Using ethers.js
const iface = new ethers.Interface(abi);
const selector = iface.getFunction('mint').selector;
// Returns: "0x40c10f19"

5. Fund your gas tank

Send testnet tokens to your project's deposit address. The dashboard shows your balance.

6. Integrate the API

When a user triggers an on-chain action, call our API:

const response = await fetch('https://sorted-backend.onrender.com/sponsor/authorize', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Authorization': 'Bearer YOUR_API_KEY'
  },
  body: JSON.stringify({
    projectId: 'your-project-id',
    user: '0xUserAddress',
    target: '0xYourContract',
    selector: '0x40c10f19',
    estimatedGas: 100000,
    chainId: 14601
  })
});

const { paymasterAndData, signature } = await response.json();

7. Submit the transaction

Use the returned paymasterAndData in your UserOperation and submit to a bundler.

Coming soon

Our SDK will handle steps 6-7 automatically. For now, see API Reference for full details.

Test it

Try the Live Demo to see a gasless transaction execute on Sonic testnet.

Next steps

• How It Works — Understand the flow
• API Reference — Full endpoint documentation