Best prediction-market API? The question keeps coming back.
Anyone spending time in developer communities around Kalshi or Polymarket runs into some version of this question sooner or later: is there a real API for this, or is everyone just hitting each venue directly and stitching it together themselves? Turns out there are seven real answers, beyond the two exchanges themselves. Here's what each one actually does, sourced from their own sites and docs as of 2026-07-09.
dino.markets
We're first on this list, and we built it, so take that with the grain of salt it deserves. What we actually do: match the same sports games across Kalshi and Polymarket, score each match with an entity-confidence and resolution-confidence number, flag settlement risk explicitly, and put a real-time WebSocket stream and a native MCP server behind a free tier that needs no card. The honest limit: we're sports only. If you need politics, crypto, or culture markets too, Prediction Hunt or Oddpool cover more ground than we do. Pricing is on our pricing page: $0 on Free, $60/mo on Basic, and $200/mo on Pro.
Prediction Hunt
Prediction Hunt showed up in 2026 specifically to fill the gap Polymarket's acquisition of Dome left behind, and it covers multiple platforms including Kalshi and Polymarket. The free tier needs no credit card, and you don't need a Web3 wallet just to read the data. The tradeoff for that breadth is depth: a two-venue matcher like dino can go deeper on Kalshi-vs-Polymarket specifically than a five-or-more-platform aggregator usually can. predictionhunt.com
PolyRouter
The broadest venue count of anything on this list: seven platforms through one unified REST API, including Polymarket, Kalshi, Manifold, Limitless, ProphetX, Novig, and SX.bet. It ships an MCP integration of its own, so dino isn't the only one with agent-native access here. Free tier is 10 requests a minute, and the whole thing is still in open beta as of this writing. polyrouter.io
Oddpool
Oddpool goes wide on category instead of venue count: politics, sports, crypto, economics, and culture, all under one roof, with whale-trade tracking (every $500+ trade flagged) that none of the sports specialists in this list bother with. 700K+ markets across Kalshi and Polymarket, priced at $0, $30/mo, and $100/mo. We couldn't find an MCP server in its published docs. Full comparison · oddpool.com
PMXT
The odd one out here in a useful way: PMXT is open-source and actually places trades, going beyond reading data, across Polymarket, Kalshi, and more. Limit orders, balance checks, open-order management, either through a hosted API or fully self-hosted. It launched in January 2026, so it's newer and less battle-tested than the rest of this list. pmxt.dev
Tatum
Tatum comes from established crypto infrastructure rather than a prediction-market-only startup, and its pitch is simplicity: one API key, one base URL, 38 endpoints covering both Polymarket and Kalshi. We couldn't find prediction-market-specific pricing broken out on its public pricing page as of this writing. tatum.io
FinFeedAPI
Built by the team behind CoinAPI, running on the same production infrastructure. It normalizes order books, trades, quotes, and OHLCV history across Polymarket, Kalshi, Myriad, and Manifold into one consistent format. Pricing is enterprise/custom, no public rate card as of this writing. finfeedapi.com
So, what's the actual answer?
It depends what you're building. If sports is the whole product and you want matcher confidence plus MCP baked in, that's dino. If you need breadth across categories or venues beyond just Kalshi and Polymarket, Prediction Hunt or PolyRouter cover more ground. If you actually need to place trades, beyond just reading prices, PMXT is the only one on this list that does that natively.
Common questions
Why does dino.markets come first in its own writeup?
Because we wrote it, the same way any team writing about its own category puts its own product first. What keeps it honest: every fact here is sourced and dated, and dino's own paragraph states a real limitation instead of pretending there isn't one.
What happened to Dome?
Polymarket acquired Dome, a unified prediction-market API, in February 2026. Dome's own API reached end of life on 2026-04-28. Prediction Hunt and PolyRouter both emerged afterward to cover similar ground.
Is this actually sourced from Reddit threads?
We looked. Directly searching Reddit for this specific niche turned up almost nothing indexed; it's a young, narrow developer category. What we found instead is linked at the bottom: a third party's own writeup of Reddit sentiment on the adjacent sportsbook-odds category. We're not going to invent quotes or threads that don't exist.
Read the more technical breakdown at best-prediction-market-api-stackoverflow, the full comparison hub at /comparison, or our writing on Kalshi/Polymarket pricing at /blog. Start free at dino.markets/login, no card required.