pmwallets

pmwallets — Node.js SDK for PMWallets

Official Node.js / TypeScript client for PMWallets: the Polymarket smart-money leaderboard computed from the Polygon chain, and the real-time fills of the Polymarket wallets you follow — delivered in order, exactly once, with every gap replayed.

中文说明 · Python SDK: pmwallets-python · Ready-to-run copy-trading bot built on it: polymarket-copy-trading-bot

Install

npm install pmwallets     # Node.js ≥ 20

Create an API key on pmwallets.com/keys.

Usage

import { PmwClient, FillStream, FileStateStore, verifyWebhook } from 'pmwallets';

const pmw = new PmwClient({ apiKey: process.env.PMW_API_KEY! });

// who is making money on Polymarket, and how
const board = await pmw.leaderboard({ minWinLo: 0.55, minEligible: 30, style: 'taker', status: 'active', limit: 50 });

// follow one (billed per entity per hour; 402 = balance too low, 409 = dormant)
await pmw.subscribe({ entityId: board.rows[0].entityId, channels: ['ws'] });

// every fill of every entity you follow
const stream = new FillStream({
  client: pmw,
  store: new FileStateStore('./stream.json'),    // a restart resumes exactly where it stopped
  onFill: async (fill, { source }) => console.log(source, fill.side, fill.price, fill.tokenId),
  onEvent: (e) => e.type === 'fatal' && console.error(e.error.message),   // e.g. another bot already holds the stream
  // takeover: true,   // replace whichever API client holds this account's stream (it stops with `replaced`)
});
await stream.start();

What is in it

PmwClient	leaderboard, entities, address unlocks, subscriptions, fills replay (fills, fillsSince), trade-history exports
FillStream	WebSocket with reconnect and keep-alive; detects missed frames by session/seq and replays them from the last fill delivered; de-duplicates by eventId; anchors behind the chain head on first start; persisted cursor
verifyWebhook(rawBody, signature, secret)	checks x-pmw-signature (HMAC-SHA256 of the raw body)

One stream per account:

• An API-key connection takes priority over the pmwallets.com feed page (the page never takes the stream from it).
• Between two API connections the first one keeps the stream. A second one — another key of the same account, or the same bot started twice — is refused: blocked, then fatal, and the stream stops. Pass takeover: true to replace the holder instead; the holder gets replaced, then fatal, and stops (it does not fight back).
• A FillStream identifies itself with a random clientId, so its own reconnects after a network drop replace its own dead connection without needing takeover.
• When the server restarts it closes the socket with 1012; the stream reconnects at once (event restarting) and replays anything it missed. HTTPS_PROXY: pass wsOptions: { agent } for the WebSocket and set a global fetch dispatcher.

PMWallets' servers are in the United Kingdom. A consumer that also trades on Polymarket should run from Ireland (AWS eu-west-1): Polymarket does not accept API orders from the UK, the US and several EU countries.

Trade-history exports

A purchase is access to files: one zstd-compressed CSV per wallet per UTC day, downloadable at once and again later.

const order = await client.createExport({ entityIds: ['0x…'], from: '2026-09-01', to: '2026-09-30' });
const { files } = await client.exportFiles(String(order.id));
for (const f of files) {
  const bytes = await client.downloadExportFile(f.wallet, f.day); // .csv.zst
}

exportFileUrl(wallet, day) returns the short-lived link instead; the API key is never sent to the storage host.

Resources

• Polymarket smart-money leaderboard — profitable Polymarket traders scored from the Polygon chain, with win-rate confidence intervals
• Polymarket copy trading guide — which wallets are worth following and how to get their fills in time
• How to learn from Polymarket smart money — reading a trader's record: confidence intervals, maker vs taker, market specialism
• PMWallets API documentation — WebSocket and webhook fill push, fills replay, trade-history exports
• Measured fill-push latency — block-to-push p50 / p95, published live
• Ways to follow Polymarket wallets, compared — official leaderboard, free trackers, SQL dashboards
• FAQ · 中文站

License

MIT