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API · /chesspuzzles-api

Chess Puzzles API

healthy 3,518 Subscribers

Serve chess tactics puzzles on demand: a random puzzle (optionally constrained by theme and rating), a single puzzle by id, full search and filtering by tactic theme and difficulty rating, and the complete list of available themes. Every puzzle includes the starting position as FEN, the full solution as UCI moves, the side to move, the difficulty rating, popularity and play count, theme and opening tags and a direct link to train it on Lichess. Built on a curated 20,000-puzzle sample of the open Lichess puzzle database (CC0) spanning 73 themes and ratings from roughly 400 to 3100. Every endpoint accepts input via the query string or the request body and returns lean JSON. Pure server-side data (no third-party upstream), so responses are instant and always available. Ideal for chess apps, training tools, "puzzle of the day" features and games.

#chess #puzzles #tactics #games #lichess #training #data
api.oanor.com/chesspuzzles-api
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Machine-readable spec so AI agents can integrate this API.

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

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
72 ms
Server probes · 24h
Subscribers
3,518
active
Total calls
12
last 7 days
status Full status page → · 12 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 18,000 calls / month
  • 3 requests / second
  • Hard cap (429 above quota, no overage)
  • 18,000 calls/month, 3 req/s
  • Random, search, single puzzle & themes — FEN + solution + Lichess link
  • No credit card
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Basic

€3.50 /month

  • 220,000 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 220,000 requests/month, 8 req/s
  • All endpoints, full theme & rating filtering
  • Commercial use included
  • Email support
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Pro

€11.00 /month

  • 1,800,000 calls / month
  • 25 requests / second
  • Hard cap (429 above quota, no overage)
  • 1,800,000 requests/month, 25 req/s
  • High throughput for chess apps & training tools
  • Priority email support
  • Commercial use allowed
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Mega

€31.00 /month

  • 9,000,000 calls / month
  • 60 requests / second
  • Hard cap (429 above quota, no overage)
  • 9,000,000 requests/month, 60 req/s
  • Highest throughput for production chess products
  • Priority support
  • Commercial use allowed
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Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Chess Puzzles API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Chess Puzzles API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Chess Puzzles 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 Chess Puzzles API cost?
Chess Puzzles API has a free tier with 100 calls / month. Paid plans start at €3.50 / 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 Chess Puzzles API GDPR-compliant?
All requests to Chess Puzzles 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/chesspuzzles-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/chesspuzzles-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/chesspuzzles-api/SOME_PATH");
curl_setopt($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/chesspuzzles-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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