Quickstart

npm install @polymarket/clob-client-v2 viem

import { ClobClient, SignatureTypeV2 } from "@polymarket/clob-client-v2";
import { createWalletClient, http } from "viem";
import { privateKeyToAccount } from "viem/accounts";

const HOST = "https://clob.polymarket.com";
const CHAIN_ID = 137; // Polygon mainnet
const account = privateKeyToAccount(process.env.PRIVATE_KEY as `0x${string}`);
const signer = createWalletClient({ account, transport: http() });
const depositWalletAddress = process.env.DEPOSIT_WALLET_ADDRESS!;

// Derive API credentials
const tempClient = new ClobClient({ host: HOST, chain: CHAIN_ID, signer });
const apiCreds = await tempClient.createOrDeriveApiKey();

// Initialize trading client
const client = new ClobClient({
  host: HOST,
  chain: CHAIN_ID,
  signer,
  creds: apiCreds,
  signatureType: SignatureTypeV2.POLY_1271,
  funderAddress: depositWalletAddress,
});

import { Side, OrderType } from "@polymarket/clob-client-v2";

const response = await client.createAndPostOrder(
  {
    tokenID: "YOUR_TOKEN_ID",
    price: 0.5,
    size: 10,
    side: Side.BUY,
  },
  {
    tickSize: "0.01",
    negRisk: false, // Set to true for multi-outcome markets
  },
  OrderType.GTC,
);

console.log("Order ID:", response.orderID);
console.log("Status:", response.status);

// View all open orders
const openOrders = await client.getOpenOrders();
console.log(`You have ${openOrders.length} open orders`);

// View your trade history
const trades = await client.getTrades();
console.log(`You've made ${trades.length} trades`);

// Cancel an order
await client.cancelOrder(response.orderID);