Prediction market data, APIs and SDKs

PolyEdge supplies Polymarket trade-stream and on-chain analytics interfaces for developers and trading systems. The product describes address- and topic-filtered streams, trader analytics and SDKs. Personal and Builder subscriptions have materially different reuse terms.

• Free and paid
• Polymarket

PolyBackTest provides historical Polymarket crypto up/down order books and strategy backtesting. Its plans distinguish data-window length, request throughput, shared or dedicated infrastructure and a separate AI workflow. An access window is not a guarantee that every market has complete historical capture.

• Paid or fee-based
• Polymarket

0xArchive supplies current and historical trading data for Hyperliquid and Lighter. Developers and researchers can query its archive, replay past activity or purchase files for analysis. Its scope includes Hyperliquid HIP-4 outcome markets alongside perpetuals, spot and HIP-3 instruments.

• Free and paid
• Hyperliquid
• Lighter

Marketlens provides Polymarket historical order books and a Python backtesting workflow. Its product describes tick-level replay, simulated queue position, latency, fills and fees, alongside market-data APIs and an MCP interface.

• Free and paid
• Polymarket

Bravado provides prediction-market infrastructure for developers. Its current product combines historical and live market data, wallet and position information, execution, and market-resolution workflows. REST-style APIs and WebSocket streams serve application and bot integrations.

• Free and paid
• Polymarket

Duel Duck lets communities create or join prediction duels on Solana. Participants stake on an outcome, the creator calls the result, and winners share the pool after applicable fees. Its developer API supports fixed-ticket and stake-range participation models.

PolyOrderbooks provides historical Polymarket order-book data for crypto and sports markets through REST, a Python SDK and MCP. Its pricing page distinguishes a short free history window, paid data windows and separately priced Backtest AI.

• Free and paid
• Polymarket

TickFoundry sells historical market data for Polymarket, Kalshi and Hyperliquid through downloads and REST. Its plans distinguish order-book depth, the view-only Lab, ongoing collection and downloadable historical backfill.

• Free and paid
• Polymarket
• Kalshi
• Hyperliquid

Predexon provides prediction-market data through REST and WebSockets, including order-book tick history, market data and wallet analytics. The product names Polymarket, Kalshi, Opinion, Limitless and Predict.fun; coverage and endpoint access vary.

• Free and paid
• Polymarket
• Kalshi

Predictefy offers normalized prediction-market data, matched markets and execution workflows through an API, SDK, CLI and MCP. Its documentation distinguishes venue-specific capabilities, paper trading and optional live execution. One interface does not imply identical support at every venue.

• Free and paid

Polymarket provides event-contract markets and developer interfaces for discovery, order books, data and execution. Its international polymarket.com service is separate from Polymarket US; the international site currently directs US visitors to the US product and offers a view-only path.

• Free and paid
• Polymarket

DepthFeed provides data or programmatic research tools.

• Free and paid
• Polymarket
• Kalshi

Poly Helper is a Chrome and Brave extension that adds crypto, stock, sport and news information within the Polymarket interface.

• Free option
• Polymarket

Kalshi operates an event-contract exchange and provides developer interfaces for market data and trading. Its documentation separates prediction contracts from perpetual futures, and its account guide describes age, identity-verification and jurisdiction conditions.

• Paid or fee-based
• Kalshi

NautilusTrader is an open-source algorithmic trading engine with Python strategy development and a Rust-native core. It supports market-data catalogues, configurable event-driven backtests and live trading adapters. Its open-source engine, institutional support and planned hosted products have different access models.

Adanos provides ticker-level sentiment data assembled from Reddit, X, news, Polymarket and crypto discussion. Its API exposes measures such as a buzz score, bullish share and trends for research or application development.

• Free and paid
• Polymarket

Resolved Markets provides data or programmatic research tools.

• Free and paid
• Polymarket

LazyEdge provides tools for developers.

• Token access
• Polymarket
• Kalshi

OddsRelay provides tools for developers.

• Paid or fee-based

outcometick provides data or programmatic research tools.

• Polymarket

Scanverity Intelligence provides tools for developers.

• Polymarket

OddsPipe provides data or programmatic research tools.

• Free and paid
• Polymarket
• Kalshi

PMXT provides a unified interface for prediction-market data and trading through a public software repository, SDKs and a hosted service. Its README distinguishes hosted credentials and signing infrastructure from a self-hosted path using venue-native credentials. Supported reads and writes differ by venue and mode.

• Free option
• Polymarket
• Kalshi

Agara presents an on-chain prediction-market interface with Yes and No outcomes. Its public app includes crypto-price and regional geopolitical events; its own description characterises the system as self-custodial.