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API · /odds-api

Betting Odds API

healthy 4,545 Subscribers

Betting-odds maths as an API, computed locally and deterministically. The convert endpoint translates a price between every format used by bookmakers — decimal (European), fractional (UK), American (moneyline) and the implied probability — give it any one and it returns all the others, with the implied probability that the odds represent (1 ÷ decimal). The payout endpoint computes the profit and total return for a stake at given decimal or American odds. The parlay endpoint combines several decimal-odds selections into one accumulator by multiplying them, returning the combined odds, the implied probability and the payout for a stake — every leg must win, so the payout grows fast while the probability shrinks. Decimal odds are the total return per unit staked, American odds are at least +100 for an underdog or −100 or lower for a favourite, and fractional odds look like 5/2. Everything is computed locally and deterministically, so it is instant and private. Ideal for sports-betting, fantasy, odds-comparison and gaming app developers, bet-slip and value tools, and probability education. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is odds conversion; for probability distributions use a probability API.

#odds #betting #sports #parlay #probability #utilities
api.oanor.com/odds-api
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Machine-readable spec so AI agents can integrate this API.

/api/odds-api/openapi.json
/api/odds-api/llms.txt

Discovery: GET /api/index.json lists every API.

Betting Odds API — live data on the oanor API marketplace

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
89 ms
Server probes · 24h
Subscribers
4,545
active
Total calls
76
last 7 days
status Full status page → · 12 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 3,000 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • Convert between decimal, American, fractional, Hong Kong and implied formats
  • Single-bet implied-probability lookups
  • Deterministic, instant local compute
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Starter

€4.00 /month

  • 40,000 calls / month
  • 5 requests / second
  • Hard cap (429 above quota, no overage)
  • All odds-format conversions
  • Implied probability and vig/margin removal
  • Parlay payout and combined-odds calculator
  • For tipster sites and small betting tools
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Pro

€12.00 /month

  • 250,000 calls / month
  • 15 requests / second
  • Hard cap (429 above quota, no overage)
  • High-volume parlay and round-robin payout maths
  • Batch conversion of multiple prices per call
  • No-vig fair-odds and edge calculations
  • Suited for odds-comparison and betting-tracker apps
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Mega

€39.00 /month

  • 1,544,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • Bulk odds processing at scale
  • Full parlay, teaser and probability suite
  • Highest throughput for production betting platforms
  • Priority compute for real-time UI refresh
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Related APIs

Other APIs with overlapping tags.

SX Bet Sports Prediction Market API — oanor API marketplace

SX Bet Sports Prediction Market API

Live data for SX Bet, the on-chain sports prediction & betting exchange on SX Network, with no key. List the active sports-betting markets (moneyline, spread, total) with their two named outcomes, teams, league, sport and game time; get the supported sports; the active leagues with event counts; and the active fixtures (upcoming games) for any league. The peer-to-peer sports-prediction layer for odds dashboards, fixture monitors and sports-data apps — distinct from Polymarket, Kalshi and Limitless. Covers 29 sports across 100+ live markets.

api.oanor.com/sxbet-api

 Limitless Prediction Market API — oanor API marketplace

Limitless Prediction Market API

Live data for Limitless Exchange, the on-chain prediction market on Base, with no key. List the active markets with each market's title, live YES/NO implied-probability prices (0–1), traded volume, deadline and category tags; pull a single-market detail by slug; and get the full tag list. Prices are the live market-implied odds for each binary outcome, settled in USDC — distinct from Polymarket and Kalshi. Ideal for odds dashboards, event monitors and crypto-native sentiment analytics across 900+ live markets.

api.oanor.com/limitless-api

 Polymarket API — oanor API marketplace

Polymarket API

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

 Craps Odds API — oanor API marketplace

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

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Betting Odds API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Betting Odds API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Betting Odds 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 Betting Odds API cost?
Betting Odds API has a free tier with 100 calls / month. Paid plans start at €4.00 / 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 Betting Odds API GDPR-compliant?
All requests to Betting Odds 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/odds-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/odds-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/odds-api/SOME_PATH");
curl_setopt($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/odds-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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