Quickstart

npm install @polymarket/clob-client ethers

import { ClobClient } from "@polymarket/clob-client";
import { Wallet } from "ethers"; // v5.8.0

const HOST = "https://clob.polymarket.com";
const CHAIN_ID = 137; // Polygon mainnet
const signer = new Wallet(process.env.PRIVATE_KEY);

// Create or derive user API credentials
const tempClient = new ClobClient(HOST, CHAIN_ID, signer);
const apiCreds = await tempClient.createOrDeriveApiKey();

// See 'Signature Types' note below
const signatureType = 0;

// Initialize trading client
const client = new ClobClient(
  HOST, 
  CHAIN_ID, 
  signer, 
  apiCreds, 
  signatureType
);

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

// Place a limit order in one step
const response = await client.createAndPostOrder({
  tokenID: "YOUR_TOKEN_ID", // Get from Gamma API
  price: 0.65, // Price per share
  size: 10, // Number of shares
  side: Side.BUY, // or SELL
});

console.log(`Order placed! ID: ${response.orderID}`);

// 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`);

import { ClobClient, Side } from "@polymarket/clob-client";
import { Wallet } from "ethers";

async function trade() {
  const HOST = "https://clob.polymarket.com";
  const CHAIN_ID = 137; // Polygon mainnet
  const signer = new Wallet(process.env.PRIVATE_KEY);

  const tempClient = new ClobClient(HOST, CHAIN_ID, signer);
  const apiCreds = await tempClient.createOrDeriveApiKey();

  const signatureType = 0;

  const client = new ClobClient(
    HOST,
    CHAIN_ID,
    signer,
    apiCreds,
    signatureType
  );

  const response = await client.createAndPostOrder({
    tokenID: "YOUR_TOKEN_ID",
    price: 0.65,
    size: 10,
    side: Side.BUY,
  });

  console.log(`Order placed! ID: ${response.orderID}`);
}

trade();