Prediction market APIs compared
The markets' own APIs, the data providers built on top of them and the open-source clients, side by side: what data each one gives, how far back it goes, how it is delivered and what it costs. Every fact comes from the provider's own documentation, pricing page or repository, read on 6 November 2026.
- markets with their own API
- 26
- markets with their own API
- independent data providers
- 42
- independent data providers
- with a free tier
- 41
- with a free tier
- with historical data
- 42
- with historical data
2 APIs match. Show all
The markets' own APIs
Run by the exchange itself. Usually free to read, with a key or a wallet signature to trade. Open a row for sign-in, rate limits and links.
| Market | Prices | Order books | Trades | History | Wallets | Trading | Delivery | Free | Paid from | Details |
|---|---|---|---|---|---|---|---|---|---|---|
| Novig | Prices: yes | Order books: yes | Trades: yes | History: not stated | Wallets: yes | Trading: yes | RESTWebSocket | ? | – | |
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Data providers
Independent services that collect, clean and resell market data, often across several exchanges and further back than the exchanges keep. Open a row for what each plan includes.
| Provider | Prices | Order books | Trades | History | Wallets | Trading | Delivery | Free | Paid from | Details |
|---|---|---|---|---|---|---|---|---|---|---|
| PredictefyPolymarket, Polymarket US +14 | Prices: yes | Order books: yes | Trades: yes | History: yes | Wallets: yes | Trading: yes | RESTWebSocketMCPSQL | Yes | $48.88 a month | |
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Quick answers
- Does Polymarket have a public API, and is it free?
- Yes. Polymarket publishes its own API (REST, WebSocket, GraphQL). Reading public market data is free and needs no API key. Its rate limits and sign-in methods are in the table on this page.
- Does Kalshi have a public API, and is it free?
- Yes. Kalshi publishes its own API (REST, WebSocket, MCP). Reading public market data is free and needs no API key. Its rate limits and sign-in methods are in the table on this page.
- Where can I get historical prediction market data?
- 42 of the APIs here offer historical data, but only 5 state an exact start date; the earliest is Probalytics, from 2 October 2020. Use the "Historical data" filter to see them all.
- Which prediction market data providers have a free tier?
- 27 of the independent providers state a free tier or free use: 0xArchive, Adanos Software, Adjacent, Bravado, DepthFeed, KalshiSpy and 21 more. Limits differ; each row gives them.
- How much does prediction market data cost?
- The cheapest published plans range from $10 a month (outcometick) to $200 a month (Prediction Labs). What each plan includes differs, so compare the data and history columns too.
- Which prediction market APIs work with AI agents?
- 24 offer an MCP server that AI assistants can call directly: Kalshi, Limitless, Hunch, 0xArchive, Adjacent, Bravado and 18 more.
Nobody pays to be listed or for their position. A tick means the provider's own pages say it offers that data; a dash means they do not say. Using or reselling a market's data is governed by that market's own terms, whoever supplies it. Prices and limits change, so the provider's own page is the one that counts. Missing an API? Add it for free, or browse every data feed and API in the directory.
Every profile is built from the product's own pages, and Vultax keeps a dated copy of each one. How the directory is made. Companies already listed can manage their profile.