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Library for interacting with the serum dex




npm (scoped) Build Status

Serum JS Client Library

JavaScript client library for interacting with the Project Serum DEX.


Using npm:

npm install @solana/web3.js @project-serum/serum

Using yarn:

yarn add @solana/web3.js @project-serum/serum


import { Account, Connection, PublicKey } from '@solana/web3.js';
import { Market } from '@project-serum/serum';

let connection = new Connection('');
let marketAddress = new PublicKey('...');
let programAddress = new PublicKey("...");
let market = await Market.load(connection, marketAddress, {}, programAddress);

// Fetching orderbooks
let bids = await market.loadBids(connection);
let asks = await market.loadAsks(connection);
// L2 orderbook data
for (let [price, size] of bids.getL2(20)) {
  console.log(price, size);
// Full orderbook data
for (let order of asks) {
    order.side, // 'buy' or 'sell'

// Placing orders
let owner = new Account('...');
let payer = new PublicKey('...'); // spl-token account
await market.placeOrder(connection, {
  side: 'buy', // 'buy' or 'sell'
  price: 123.45,
  size: 17.0,
  orderType: 'limit', // 'limit', 'ioc', 'postOnly'

// Retrieving open orders by owner
let myOrders = await market.loadOrdersForOwner(connection, owner.publicKey);

// Cancelling orders
for (let order of myOrders) {
  await market.cancelOrder(connection, owner, order);

// Retrieving fills
for (let fill of await market.loadFills(connection)) {
  console.log(fill.orderId, fill.price, fill.size, fill.side);

// Settle funds
for (let openOrders of await market.findOpenOrdersAccountsForOwner(
)) {
  if (openOrders.baseTokenFree > 0 || openOrders.quoteTokenFree > 0) {
    // spl-token accounts to which to send the proceeds from trades
    let baseTokenAccount = new PublicKey('...');
    let quoteTokenAccount = new PublicKey('...');

    await market.settleFunds(