Build on every prediction market

Trade, analyze, and build products across 10+ prediction markets — with a single SDK.

Get API Key Docs

import pmxt from 'pmxtjs';

// Initialize the universal client
const api = new pmxt.Polymarket({ pmxtApiKey: process.env.PMXT_API_KEY });

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prediction markets

years of historical data

What you can build

The same SDK powers trading bots, analytics platforms, and market research tools.

Cross-market arbitrage

Find price discrepancies across venues in real-time. The matching engine links identical markets across Polymarket, Kalshi, Limitless, and more.

See it live — 0xinsider.com/arbitrage

Historical backtesting

3+ years of OHLCV data across every major prediction market. Backtest strategies before risking capital.

View OHLCV docs

Multi-venue trading

Trade on Polymarket, Kalshi, Limitless, and more — from one codebase. No per-venue integration work.

Matched markets

Automatically find the same event across different venues. Compare prices and see where the same market trades.

Smart order router

Coming soon

Never overpay on a trade. The router scans 10+ venues, finds the best prices, and splits your order for optimal execution — so every dollar goes further.

PMXT

Built with PMXT

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Calibrated

Scores economists, investors, and public figures on prediction accuracy — using Polymarket and Kalshi as ground truth.

calibrated.fyi

CCXT for prediction markets.

Read the docs GitHub