All openings with a given ECO code
API · /chessopenings-api
Chess Openings API
The Encyclopaedia of Chess Openings (ECO) as an API — 3,161 named chess openings and variations with their ECO code (A00–E99), full name, family/variation and the exact move sequence (PGN and a clean move list). Search openings by name, ECO code or ECO volume; list every opening under a code (e.g. B20 → 27 Sicilian lines); pick a random opening; and — the killer feature — identify which opening a game is in from a sequence of moves (e.g. "1. e4 c5 2. Nf3" → Sicilian Defense). Ideal for chess apps, game analysis, training tools, bots and trivia. Open data from the lichess-org/chess-openings project.
API health
healthy- Uptime
- 100.00%
- Server probes · 24h
- Avg latency
- 125 ms
- Server probes · 24h
- Subscribers
- 4,815
- active
- Total calls
- 110
- last 7 days
Pricing
Pick a tier — billed monthly, cancel anytime.
Free
Free
- 3,600 calls / month
- 2 requests / second
- Hard cap (429 above quota, no overage)
- 3,600 calls/month
- 2 req/sec
- Search + ECO + identify
- No credit card
Starter
€4.30 /month
- 49,500 calls / month
- 8 requests / second
- Hard cap (429 above quota, no overage)
- 49.5k calls/month
- 8 req/sec
- Move-identify + random
- Email support
Pro
€12.50 /month
- 243,000 calls / month
- 20 requests / second
- Hard cap (429 above quota, no overage)
- 243k calls/month
- 20 req/sec
- Chess apps / analysis / bots
- Priority support
Mega
€33.80 /month
- 1,205,000 calls / month
- 50 requests / second
- Hard cap (429 above quota, no overage)
- 1.2M calls/month
- 50 req/sec
- Chess platform
- Dedicated SLA
Built by
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Frequently asked questions
Quick answers about pricing, quotas, and integration.
How do I get an API key for Chess Openings API?
What's the rate limit for Chess Openings API?
How much does Chess Openings API cost?
Can I cancel my subscription anytime?
Is Chess Openings API GDPR-compliant?
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/chessopenings-api/SOME_PATH \
-H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/chessopenings-api/SOME_PATH", {
headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/chessopenings-api/SOME_PATH");
curl_setopt($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/chessopenings-api/SOME_PATH",
headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())
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