One market in full
API · /polymarket-api
Polymarket API
healthy
3,929 Subscribers
Live prediction-market data from Polymarket, the largest real-money prediction market, via its public Gamma API. On Polymarket people trade shares in the outcome of real-world events, so each market's price is a live, money-backed probability. Get the most active markets, each with its outcomes and their implied probabilities, the best bid and ask, the traded volume and the liquidity. Read one market in full, including its description and resolution date. Pull the biggest events — an event groups related markets, like a championship with one market per team — with their total volume and market count. Get one event with every sub-market and its current probability, the whole field at a glance. Live, no key, nothing stored. Distinct from sports-betting-odds and price-feed APIs — this is Polymarket's money-backed event probabilities and its markets. Perfect for forecasting, trading-signal, news and analytics apps.
api.oanor.com/polymarket-api
API health
healthy- Uptime
- 100.00%
- Server probes · 24h
- Avg latency
- 291 ms
- Server probes · 24h
- Subscribers
- 3,929
- active
- Total calls
- 8
- last 7 days
Pricing
Pick a tier — billed monthly, cancel anytime.
Free
Free
- 9,000 calls / month
- 3 requests / second
- Hard cap (429 above quota, no overage)
- 9k calls/month
- 3 req/sec
- Markets + market + events + event
- No credit card
Starter
€10.00 /month
- 158,000 calls / month
- 6 requests / second
- Hard cap (429 above quota, no overage)
- 158k calls/month
- 6 req/sec
- Email support
Pro
€28.00 /month
- 890,000 calls / month
- 15 requests / second
- Hard cap (429 above quota, no overage)
- 890k calls/month
- 15 req/sec
- Priority support
Business
€67.00 /month
- 4,850,000 calls / month
- 40 requests / second
- Hard cap (429 above quota, no overage)
- 4.85M calls/month
- 40 req/sec
- Dedicated SLA
Built by
Related APIs
Other APIs with overlapping tags.
Manifold API
Live prediction-market and forecaster data from Manifold, the largest play-money prediction market and forecasting community, via its public API. On Manifold anyone can create a market and everyone trades with mana, the platform's play-money, so each market's price is a crowd-sourced probability and every trader has a track record. Search markets and get each one's question, current probability, mana volume, unique-bettor count, liquidity and creator. Read one market in full, with its description and close time. See the top holders of a market — who is forecasting which way and how much mana they have invested. Read a forecaster's profile: their mana balance, all-time profit and how many markets they have created. Live, no key, nothing stored. Distinct from real-money prediction-market and sports-odds APIs — this is Manifold's community markets, their crowd probabilities and their forecasters. Perfect for forecasting, trading-signal, research and community apps.
api.oanor.com/manifold-api
Craps Odds API
Craps odds maths as an API, computed locally and deterministically and exactly — the dice probabilities behind the table, derived from the 36 ways two dice fall, not pulled from a chart. The come-out endpoint gives the come-out roll: the pass line wins on a 7 or 11 (8 of 36, 22.2 %), loses on craps 2, 3 or 12 (4 of 36, 11.1 %), and otherwise sets a point (24 of 36, 66.7 %). The point endpoint gives the odds of making a point before a seven — probability = ways(point) ÷ (ways(point) + 6) — so a 6 or 8 makes 45.5 % of the time and a 4 or 10 only 33.3 %, with the TRUE odds (2:1, 3:2, 6:5) the free odds bet behind the line pays at zero house edge. The bet endpoint gives the house edge of the main bets: the line bets at 1.41 % (pass) and 1.36 % (don't) and place 6/8 at 1.52 % are the table's best, while place 4/10 (6.67 %), the field and proposition bets like any seven (16.67 %) bleed you. Everything is computed locally and deterministically, so it is instant and exact. Ideal for craps and casino-game apps, gambling-education and odds tools, game-design back-ends, and probability teaching. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 compute endpoints. Educational — not betting advice; back the line with free odds.
api.oanor.com/craps-api
Lottery Odds API
Lottery combinatorics as an API, computed locally and deterministically and exactly — the real odds behind a ticket, the maths the jackpot poster never shows. The odds endpoint gives the jackpot odds of a pick-N game as the number of possible tickets, C(pool, picks), times the bonus-ball pool if there is one: a 6/49 game is 1 in 13,983,816, a 5/69-plus-1/26 Powerball-style game is 1 in 292,201,338, and every single line is equally unlikely. The match-odds endpoint gives the chance of matching exactly k of the main numbers — a prize tier — from the hypergeometric formula C(picks, k)·C(pool−picks, picks−k) ÷ C(pool, picks), so matching 3 of 6 in a 6/49 game is about 1 in 57. The expected-value endpoint turns a jackpot and ticket price into the expected value and the break-even jackpot (price × the odds), the threshold a jackpot must clear before a ticket is even theoretically worth it — before a shared jackpot, lump-sum and tax pull it back under. Everything is computed locally and deterministically, so it is instant and exact. Ideal for lottery and odds apps, gambling-education and responsible-play tools, probability teaching, and game back-ends. Pure local computation — no key, no third-party service, instant. Exact combinatorics. Live, nothing stored. 3 compute endpoints. Educational — not gambling advice; the odds are always against you.
api.oanor.com/lottery-api
Roulette Odds API
Roulette odds maths as an API, computed locally and deterministically and exactly — the payout, the true probability and the house edge behind every bet, the numbers a fair game tells you and a casino would rather you ignore. The payout endpoint gives a bet's payout, winning numbers, win probability and house edge for a European (single-zero) or American (double-zero) wheel: a straight-up number pays 35 to 1 but wins only 1 in 37, an edge of 2.70 % European or 5.26 % American, the same on almost every bet because the payout simply ignores the zeros. The expected-value endpoint turns a stake into its expected value — stake × (win probability × (payout + 1) − 1), always negative and equal to minus the stake times the house edge — so €10 on a single number on a European wheel is worth −€0.27 every spin. The martingale endpoint exposes the doubling system: total risked = base × (2^steps − 1), the bet that explodes after a losing streak, and the bust probability — proof on the maths that no progression beats the zero. Everything is computed locally and deterministically, so it is instant and exact. Ideal for casino-game and odds apps, gambling-education and responsible-play tools, game-design back-ends, and probability teaching. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 compute endpoints. Educational — not betting advice; the house always wins long-run.
api.oanor.com/roulette-api
Frequently asked questions
Quick answers about pricing, quotas, and integration.
How do I get an API key for Polymarket API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Polymarket API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Polymarket API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does Polymarket API cost?
Polymarket API has a free tier with 100 calls / month. Paid plans start at €10.00 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is Polymarket API GDPR-compliant?
All requests to Polymarket API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.
Pick an endpoint from the list on the left to see its details and try it.
Code snippets
Sign up to get an API key, then call any path under your slug.
curl https://api.oanor.com/polymarket-api/SOME_PATH \
-H "x-oanor-key: oanor_test_..."const res = await fetch("https://api.oanor.com/polymarket-api/SOME_PATH", {
headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();$ch = curl_init("https://api.oanor.com/polymarket-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);import requests
r = requests.get(
"https://api.oanor.com/polymarket-api/SOME_PATH",
headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())Ratings
Sign in to rate.
No reviews yet.
Discussion
Ask questions, share usage tips, get answers from the provider and other developers. Public — anyone can read.
Sign in to start a thread or reply.
Sign inNew thread
📌 Pinned
🔒 Locked
·
·
·
-
Provider answer
🔒 This thread is locked — no new replies.
-
·
- No threads yet — start the discussion.
Support
Private 1:1 support with the provider — billing questions, integration issues, account problems. Only you and the provider team can see these threads.
Sign in to open a support ticket.
Sign inOpen new ticket
Describe what you need help with. The provider team gets an email and replies on the ticket page.
-
·
Urgent - No tickets yet for this API.