@marketmaster/sdk

Official JavaScript/TypeScript SDK for the MarketMaster prediction-market data API — live edges, arbitrage spreads, market snapshots, and the whale feed across Kalshi and Polymarket.

Install

npm install @marketmaster/sdk

Quickstart

import { MarketMaster } from "@marketmaster/sdk";

const mm = new MarketMaster({ apiKey: process.env.MM_API_KEY }); // mmk_live_...

const { edges } = await mm.edges({ platform: "kalshi", min_edge: 5, limit: 10 });
const { opportunities } = await mm.arbitrage({ min_spread: 2 });
const { trades } = await mm.whales({ min: 10000 });
const one = await mm.market("kalshi", "PRES-2028-DEM");
const me  = await mm.status();

Methods

| Method | Endpoint | Options | |---|---|---| | edges(opts) | GET /v1/edges | platform, category, min_edge, limit, offset | | markets(opts) | GET /v1/markets | source, category, limit, offset | | market(source, id) | GET /v1/market | — | | arbitrage(opts) | GET /v1/arbitrage | min_spread, limit, offset | | whales(opts) | GET /v1/whales | source, min, limit, offset | | status() | GET /v1/status | — |

Auto-pagination

for await (const edge of mm.paginate("edges", { platform: "polymarket" }, "edges")) {
  console.log(edge.market_title, edge.edge_pct);
}

Errors

Failed requests throw MarketMasterError with .status, .code, and .retryAfter (on 429s).

Get a key at https://marketmaster.live/dashboard · Full docs: https://marketmaster.live/developers