#engine

Lichess as an API — the open-source chess platform, returned as clean JSON, no key. Look up any player's profile (titles, ratings across bullet, blitz, rapid and classical, game counts, country, FIDE rating), their rating history per variant and online status; pull the top players for any performance type; fetch a user's recent games with openings, clocks, results and full move lists; get a Stockfish cloud evaluation of any position by FEN (best lines, centipawn or mate scores); serve the daily puzzle or any puzzle by id (with solution and themes); and list current, upcoming and finished tournaments. Live data straight from lichess.org. Distinct from Chess.com player stats: Lichess is its own platform with cloud engine analysis, a puzzle database and arena tournaments — ideal for chess apps, coaching tools, analysis boards, bots and leaderboards. 9 data endpoints. Authenticated with an x-oanor-key; fair-use rate limits per plan.

api.oanor.com/lichess-api

Internal-combustion engine maths as an API, computed locally and deterministically. The displacement endpoint computes an engine's swept volume from the bore, the stroke and the number of cylinders, V = (π/4)·bore²·stroke per cylinder, in cubic centimetres, litres and cubic inches, and classifies the bore-to-stroke geometry as oversquare, square or undersquare. The compression endpoint relates the compression ratio and the clearance volume, CR = (swept + clearance)/clearance — give the clearance to get the ratio or the ratio to get the clearance — and, with a boost pressure, estimates the effective compression ratio of a forced-induction engine. The power-to-weight endpoint computes the power-to-weight ratio in horsepower per tonne, kilowatts per tonne and watts per kilogram, the weight per horsepower, and, with a displacement, the specific output in horsepower per litre. Bore and stroke are in millimetres, volumes in cc, weight in kilograms and power in horsepower or kilowatts. Everything is computed locally and deterministically, so it is instant and private. Ideal for automotive, motorsport, motorcycle and engine-builder app developers, build-spec and tuning tools, and mechanical education. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is engine geometry and tuning; for EPA fuel-economy data use a fuel-economy API and for tyre sizes a tyre-calculator API.

api.oanor.com/engine-api