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Some API operations require a cryptographic signature from your wallet. The examples below show how to generate one using a private key or an injected browser wallet (e.g. MetaMask).

​
Private key signing example

import { Wallet } from "ethers";

const wallet = new Wallet(process.env.SX_PRIVATE_KEY);

const domain = {
  name: "CancelOrderSportX",
  version: "1.0",
  chainId: 4162, // Mainnet — use 79479957 for testnet
};

const types = {
  Details: [
    { name: "message", type: "string" },
    { name: "orders", type: "string[]" },
  ],
};

const value = {
  message: "Are you sure you want to cancel these orders",
  orders: [
    "0x550128e997978495eeae503c13e2e30243d747e969c65e1a0b565c609e097506",
  ],
};

const signature = await wallet.signTypedData(domain, types, value);
Here we use a private key directly which is the most straightforward way to sign data and does not require access to an authenticated node. It’s also the fastest.

​
Injected provider signing example

import { BrowserProvider } from "ethers";

const provider = new BrowserProvider(window.ethereum);
const signer = await provider.getSigner();

const domain = {
  name: "CancelOrderSportX",
  version: "1.0",
  chainId: 4162, // Mainnet — use 79479957 for testnet
};

const types = {
  Details: [
    { name: "message", type: "string" },
    { name: "orders", type: "string[]" },
  ],
};

const value = {
  message: "Are you sure you want to cancel these orders",
  orders: [
    "0x550128e997978495eeae503c13e2e30243d747e969c65e1a0b565c609e097506",
  ],
};

const signature = await signer.signTypedData(domain, types, value);
Here we use ethers.js and show an example with MetaMask — any injected provider that exposes eth_signTypedData_v4 will work.
This signing scheme uses the EIP-712 typed data standard.
Last modified on March 26, 2026