Open Source Prediction Market Tools

OddsPipe

A cross-venue data API with matched markets, confidence scores and spread analysis.

Polyrama is a real-time prediction-market terminal for Polymarket and Kalshi. It combines live odds, cross-venue market search, public-wallet analytics, trader leaderboards, whale and mispricing signals, dashboard state, historical backtests, REST API access, and an open-source MCP server for AI agents. The MCP exposes research and paper-trading tools only; it does not place live orders.

The Overround

The Overround compares the same event across Kalshi, Polymarket and a panel of nine US sportsbooks, normalises the prices so they can be read against each other, and shows which venue is cheapest to back a given side. It also publishes the overround on each market, the sum of what it costs to back every outcome at each venue, so you can see what the house is charging before you trade. Every market gets its own page carrying the full field, the settlement source and the contract terms. Free, no account, and the underlying data is available as unauthenticated JSON.

Coinverse

Are you ready to take your trading to the next level? Experience the power of a prediction market with Coinverse! Join us now! #Coinverse #TradingRevolution #JoinNow

socialpredict

The open prediction market engine for everyone SocialPredict lets anyone – individuals, classrooms, companies, and even governments – tap into the power of prediction markets.

Prediction Hunt / Prediction.com

Prediction Hunt now redirects to Prediction.com, which compares prediction-market prices and provides a normalized data API.

Whales Market

Track and analyze whale activity in prediction markets.

Polygun

Sophisticated automated trading bot for position mirroring.

PolyCop

AI Agent interface and MCP server for prediction markets.

polyinsiders

Exclusive community for alpha and trading signals.

polyagentleague

Competitive AI agent leaderboards.

Building tools & community resources to bring Polymarket into everyday lexicon

No-code playground for building & sharing AI agents

Real-time Polymarket Data Access

Bet on the news with your friends

Deep AI research & API layer for prediction markets

Data on all Polymarket traders, markets, positions, and trades

Algorithms for prediction markets

Prediction market protocol on Polkadot with categorical and scalar markets.

Pioneer decentralized prediction market protocol and oracle on Ethereum.

Futarchy-based governance protocol on Solana using prediction markets for decision-making.

Normalized prediction-market data with historical trades, order books and streaming access.

Polymarket API

Official market-discovery, order-book and market-data interfaces for Polymarket.

Kalshi API

Official public REST data for Kalshi events, markets and order books.