Compare prediction-market data
Neutral, factual explainers comparing prediction market data providers, event contract data, and traditional market data. Each page states what the alternatives are and what differs, without ranking vendors.
Venue, data provider, index provider
Three roles get conflated. A venue lists and settles contracts and owns the terms. A data provider distributes market data from one or more venues. An index provider defines a methodology and calculates a benchmark. It publishes the result with the rules and the audit trail. Adjacent is an index and data provider. It does not accept orders or hold customer funds.
Explainers
- Prediction market data providers and APIs for funds — Adjacent provides prediction market data for funds, data teams and AI agents. It includes normalized Kalshi and Polymarket market data, 149 indices, 1,514 reference rates and formal methodologies. Delivery is a free REST API and an MCP server. The public tier needs no key and is delayed 15 minutes. Licensed real-time access is available for funds and index licensees.
- Event-contract data and traditional market data — A factual comparison of prediction-market data and traditional market data. It covers how event-contract data can be organized.
- Kalshi and Polymarket data shapes — A neutral guide to Kalshi and Polymarket data. It covers venues, event contracts, and cross-platform market data.
Sources
Page last reviewed: 2026-09-24.