matchwire.win — Mapped Prediction Markets (Kalshi, Polymarket, Predict.fun) MCP server

matchwire.win

Mapped prediction-market data for Node.js and Python. One client, no dependencies: matchwire.win returns one row per game, matched across Kalshi, Polymarket US, Polymarket International and Predict.fun, with each venue's own market id left intact — the pieces you need to compare a Kalshi API market with its Polymarket API twin without owning a reconciliation job.

Market types are matched too: winners, spreads and handicaps, totals and props. The line is part of the match, so over 45.5 is never confused with over 48.5.

Mapping only — no prices, no order books. Prices come from each venue; this library tells you which market on which venue is the same game.

import { Matchwire } from 'matchwire.win';

const mw = new Matchwire({ apiKey: process.env.MATCHWIRE_API_KEY });

const { rows, seq } = await mw.rows({ sport: 'nfl', venue: ['kalshi', 'poly'] });
const game = rows.find((r) => r.listings.length > 1);
console.log(game.name, game.listings.map((l) => `${l.venue}:${l.marketId}`));

<!-- Verified against the live API on 2026-09-30. -->

• Zero dependencies. One src/ directory on the global fetch. Nothing installs alongside it.
• Node.js 18+, ESM and CommonJS, hand-written TypeScript declarations.
• Typed errors — a 429 is distinguishable from a 401 invalid_key in code, not by string matching.
• Deltas and streaming — since= for changed rows and tombstones, or the same updates over SSE.
• MCP included — the same tools an AI agent gets from https://api.matchwire.win/mcp.
• MIT licensed.

Install

npm install matchwire.win      # Node.js — zero dependencies
pip install matchwire.win      # Python 3.9+ — standard library only

Get a key at matchwire.win — plans start at $99/month with a 14-day trial on Starter.

Quickstart

Save as quickstart.mjs and run node quickstart.mjs (Needs MATCHWIREAPIKEY in the environment):

import { Matchwire } from 'matchwire.win';

const mw = new Matchwire({ apiKey: process.env.MATCHWIRE_API_KEY });

const status = await mw.status();
console.log(`${status.store.events} games, ${status.store.bound} bound listings`);

const { sports } = await mw.sports();
console.log(sports.slice(0, 5).map((s) => `${s.sport} ${s.events}`));

const { rows } = await mw.rows({ sport: 'nfl', limit: 3 });
for (const row of rows) {
  console.log(row.name, row.status, row.listings.map((l) => l.venue).join('+'));
}

The repository ships the same thing with formatting and error handling: node examples/quickstart.mjs.

API

Filters

sport, venue, type, league, status accept a value or a comma list; they combine. since= switches to a delta (changed rows plus tombstones).

• venue= kalshi · poly (Polymarket US) · polyintl (Polymarket International) · predictfun
• type= winner · total · handicap · map_winner · score · event
• status= scheduled · live · ended
• sport= a sport name (baseball, not mlb) or a group id from sports()

Shortened. The full README is on GitHub.