{"id":2857,"date":"2026-05-07T10:00:00","date_gmt":"2026-05-07T10:00:00","guid":{"rendered":"https:\/\/oddspapi.io\/blog\/?p=2857"},"modified":"2026-04-11T17:06:41","modified_gmt":"2026-04-11T17:06:41","slug":"prediction-market-api-2026-stack","status":"publish","type":"post","link":"https:\/\/oddspapi.io\/blog\/prediction-market-api-2026-stack\/","title":{"rendered":"Prediction Market API 2026: Every Exchange & Onchain Venue Compared"},"content":{"rendered":"

The Prediction Market Stack in 2026: Every Exchange and Onchain Market Worth Integrating<\/h2>\n

Five years ago, “prediction market” meant Augur, PredictIt, and a long wait list for Betfair’s partner API. Today there are at least fifteen venues with live liquidity, and they’re split across four different architectures \u2014 regulated US exchanges, UK\/EU exchanges, crypto P2P books, and onchain CLOB markets. Integrating all of them one by one is a multi-quarter engineering project. Most people don’t finish it; they ship against two or three, call it good, and leave the rest of the market invisible to their model.<\/p>\n

This post is the map. Every venue worth knowing about, what architecture it runs on, how you actually get its data, and \u2014 for the thirteen of them that live behind OddsPapi \u2014 how to pull them with one HTTP request instead of fifteen.<\/p>\n

The Short Version (Comparison Table)<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Venue<\/th>\nType<\/th>\nCurrency<\/th>\nAuth (Direct)<\/th>\nOddsPapi Slug<\/th>\nBest For<\/th>\n<\/tr>\n<\/thead>\n
Pinnacle<\/strong><\/td>\nSharp sportsbook<\/td>\nFiat \/ Crypto<\/td>\nAccount + partner API<\/td>\npinnacle<\/code><\/td>\nNo-vig fair value baseline<\/td>\n<\/tr>\n
Betfair Exchange<\/strong><\/td>\nUK exchange<\/td>\nGBP \/ EUR<\/td>\n\u00a3299 + SSL certs + session tokens<\/td>\nbetfair-ex<\/code><\/td>\nDeepest exchange liquidity globally<\/td>\n<\/tr>\n
Matchbook<\/strong><\/td>\nUK exchange<\/td>\nGBP \/ EUR \/ USD<\/td>\nKYC account + session tokens<\/td>\nmatchbook<\/code><\/td>\nSharper US sports, lowest commission<\/td>\n<\/tr>\n
SX Bet<\/strong><\/td>\nCrypto P2P exchange<\/td>\nUSDC on Polygon<\/td>\nEIP-712 + wallet<\/td>\nsx.bet<\/code><\/td>\nNon-KYC crypto exchange with deep soccer\/MLB books<\/td>\n<\/tr>\n
Prophet Exchange<\/strong><\/td>\nUS-regulated P2P<\/td>\nUSD<\/td>\nUS-state account + B2B partnership<\/td>\nprophetx<\/code><\/td>\nSharpest legal US P2P prices, no bet limiting<\/td>\n<\/tr>\n
4casters Exchange<\/strong><\/td>\nAsian exchange<\/td>\nCrypto \/ fiat<\/td>\nAgent-only account<\/td>\n4casters<\/code><\/td>\nIndependent second exchange for Betfair comparison<\/td>\n<\/tr>\n
Fair999 \/ Orbit \/ Piwi247 \/ Sharp Exchange<\/strong><\/td>\nBetfair clones (Asian agent network)<\/td>\nCredit line via agent<\/td>\nHong Kong \/ Macau agent relationship<\/td>\nfair999-ex<\/code> \/ orbitx<\/code> \/ piwi247-ex<\/code> \/ sharpxch<\/code> (all resolve to betfair-ex<\/code>)<\/td>\nAlready in your Betfair data \u2014 these mirror the same liquidity<\/td>\n<\/tr>\n
Polymarket<\/strong><\/td>\nOnchain CLOB<\/td>\nUSDC on Polygon<\/td>\nEIP-712 + Polygon wallet<\/td>\npolymarket<\/code><\/td>\nOnchain-native events (politics, culture, crypto)<\/td>\n<\/tr>\n
Limitless Exchange<\/strong><\/td>\nOnchain binary<\/td>\nUSDC on Base<\/td>\nEIP-712 + Base wallet<\/td>\nlimitless-ex<\/code><\/td>\nBinary yes\/no markets, Base L2<\/td>\n<\/tr>\n
Myriad Markets<\/strong><\/td>\nOnchain binary<\/td>\nCrypto (onchain)<\/td>\nEIP-712 + wallet<\/td>\nmyriad<\/code><\/td>\nNon-KYC onchain binaries, low overround<\/td>\n<\/tr>\n
Kalshi<\/strong><\/td>\nUS-regulated exchange<\/td>\nUSD<\/td>\nCFTC-licensed account + API key<\/td>\nkalshi<\/code><\/td>\nOnly CFTC-regulated event-contract market in the US<\/td>\n<\/tr>\n
Predict.fun<\/strong><\/td>\nOnchain CLOB<\/td>\nUSDC on BNB Chain<\/td>\nEIP-712 + BNB wallet + Discord-issued API key<\/td>\nNot on OddsPapi<\/td>\nKalshi-mirrored event markets, BNB Chain native<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n

That’s fifteen venues across four architectures. Twelve of them are on OddsPapi behind a single query parameter. The thirteenth, Predict.fun, needs a direct integration \u2014 we covered that one separately<\/a>.<\/p>\n

Architecture #1: Sharp Sportsbooks (The Baseline)<\/h2>\n

A prediction-market model doesn’t make sense in isolation \u2014 you need a “true price” to compare onchain numbers against. Pinnacle<\/strong> is the closest thing. Its lines are generated by a quant model, it doesn’t limit winning bettors, and its no-vig implied probability is the reference point every other venue gets benchmarked against.<\/p>\n

Include Pinnacle in every query. If your Polymarket number and Pinnacle’s no-vig fair value agree, the onchain market is priced efficiently and there’s nothing to do. If they disagree by more than the combined transaction cost of both venues, you have a potential edge.<\/p>\n

r = requests.get(\n    \"https:\/\/api.oddspapi.io\/v4\/odds\",\n    params={\n        \"apiKey\": API_KEY,\n        \"fixtureId\": fixture_id,\n        \"bookmakers\": \"pinnacle\",\n    },\n)\npin = r.json()[\"bookmakerOdds\"][\"pinnacle\"]<\/code><\/pre>\n
That’s the entire Pinnacle integration. Pinnacle’s own B2B API is a separate partner product with a negotiated contract; OddsPapi fronts it with a free-tier API key.<\/p>\n
Architecture #2: Traditional Exchanges (Betfair, Matchbook)<\/h2>\n
Two UK-licensed P2P exchanges, both with real ladder depth, both running classic “session token + account required” auth flows if you go direct. Betfair<\/strong> is the bigger book by volume; Matchbook<\/strong> is the sharper book on US sports and runs the tighter commission (1.5% vs Betfair’s 2\u20135% scale).<\/p>\n
Four of the five Asian exchanges (Fair999, Orbit, Piwi247, Sharp Exchange) are clones<\/em> of Betfair Exchange \u2014 they share the same order book, mediated through an agent network. When you pull betfair-ex<\/code> from OddsPapi you’re already getting the data those venues trade against. The one exception is 4casters<\/strong>, which runs its own independent ladder. Pull all three in one call to get the full UK+Asia exchange stack:<\/p>\n
r = requests.get(\n    \"https:\/\/api.oddspapi.io\/v4\/odds\",\n    params={\n        \"apiKey\": API_KEY,\n        \"fixtureId\": fixture_id,\n        \"bookmakers\": \"betfair-ex,matchbook,4casters\",\n    },\n)\nbooks = r.json()[\"bookmakerOdds\"]\n\nfor slug, book in books.items():\n    market = book.get(\"markets\", {}).get(\"101\", {})\n    home = market.get(\"outcomes\", {}).get(\"101\", {}).get(\"players\", {}).get(\"0\", {})\n    meta = home.get(\"exchangeMeta\") or {}\n    # Both shapes: {back\/lay} for 4casters, {availableToBack\/Lay} for Betfair\/Matchbook\n    back_list = meta.get(\"back\") or meta.get(\"availableToBack\") or []\n    lay_list = meta.get(\"lay\") or meta.get(\"availableToLay\") or []\n    best_back = back_list[0][\"price\"] if back_list else home.get(\"price\")\n    best_lay = lay_list[0][\"price\"] if lay_list else None\n    print(f\"{slug:12} back {best_back} \/ lay {best_lay}\")<\/code><\/pre>\n
Architecture #3: P2P Sportsbook Exchanges (SX Bet, ProphetX)<\/h2>\n
Not quite traditional exchanges, not onchain prediction markets either \u2014 a third category of peer-to-peer sports books where the venue matches bettors but doesn’t provide the order book infrastructure of a Betfair-style ladder. Both publish a best-price-per-side rather than full ladder depth, and both are worth pulling alongside sportsbook data.<\/p>\n