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API · /codeforces-api

Codeforces API

healthy 4,064 Subscribers

Codeforces as an API — the largest competitive-programming platform, running regular rated rounds for hundreds of thousands of programmers worldwide. This API wraps the official Codeforces API into a clean, predictable JSON service. /v1/user looks up one or many competitors' profiles — current and maximum rating with the corresponding rank/title (from newbie through grandmaster to legendary grandmaster), contribution score, country, city, organization, registration date and avatar. /v1/rating returns a competitor's full rating history, contest by contest, with the old and new rating, the rating change and the rank achieved in each round — ideal for plotting a rating curve. /v1/contests lists upcoming and past contests, filterable by phase (BEFORE for the schedule of upcoming rounds, FINISHED for the archive), each with start time, duration and type. /v1/problems searches the entire Codeforces problemset by tag (dp, graphs, greedy, math, implementation, data structures and dozens more) and by difficulty-rating range, returning each problem's contest id, index, name, difficulty rating and tags with a direct link. Ratings range from ~800 to 3500+. Ideal for competitive-programming dashboards, rating trackers, training and problem-recommendation tools, and Discord/Telegram bots for CP communities. Data from the official Codeforces API, free to use. The service is resilient to Codeforces' concurrency rate-limit (automatic retry with backoff).

#codeforces #competitive-programming #algorithms #programming-contests #developer-tools #ratings #problemset
api.oanor.com/codeforces-api
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Machine-readable spec so AI agents can integrate this API.

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

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

Codeforces API — live data on the oanor API marketplace

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
378 ms
Server probes · 24h
Subscribers
4,064
active
Total calls
133
last 7 days
status Full status page → · 21 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 1,000 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 1000 calls/month
  • 2 req/sec
  • Profiles, ratings, contests & problems
  • No credit card
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Starter

€8.00 /month

  • 30,000 calls / month
  • 5 requests / second
  • Hard cap (429 above quota, no overage)
  • 30k calls/month
  • 5 req/sec
  • Full rating history
  • Email support
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Pro

€24.00 /month

  • 130,000 calls / month
  • 12 requests / second
  • Hard cap (429 above quota, no overage)
  • 130k calls/month
  • 12 req/sec
  • Problemset search & dashboards
  • Priority support
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Mega

€64.00 /month

  • 520,000 calls / month
  • 35 requests / second
  • Hard cap (429 above quota, no overage)
  • 520k calls/month
  • 35 req/sec
  • High-volume bots & trackers
  • Dedicated SLA
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Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Codeforces API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Codeforces API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Codeforces 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 Codeforces API cost?
Codeforces API has a free tier with 100 calls / month. Paid plans start at €8.00 / 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 Codeforces API GDPR-compliant?
All requests to Codeforces 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.

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Code snippets

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curl https://api.oanor.com/codeforces-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/codeforces-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/codeforces-api/SOME_PATH");
curl_setopt($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/codeforces-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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