Adjacent
Market indices
Prediction-market indices and reference rates.
OpenWorlds Alternatives (2026)
Compare the top 5 platforms similar to OpenWorlds. Match on features, US legality, and crypto support to find the right fit for your trading style.
Ranked by shared features with OpenWorlds. Last updated November 2026.
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Betfair exchange APIs and historical data.
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Onchain market data API documentation.
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Developer library
A shared API for prediction-market data and trading.
About OpenWorlds
OpenWorlds is an AI lab building personal trading agents for markets. Users can trade with public agents or create their own to discover and evaluate opportunities; in September 2026 it announced a partnership with Polymarket to bring agents to prediction markets.
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