Codeforces API
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).
api.oanor.com/codeforces-api
