Steam Charts API
Live Steam concurrent-player counts and the most-played-games charts, with no key. This reads Valve's own public Steam charts and player-count endpoints and returns clean JSON: how many people are playing any game on Steam right now (by app id, with the game name resolved from the Steam store), the live leaderboard of the most-played games ranked by current concurrent players with today's peaks, and the most-played chart with week-over-week movement (current rank, last week's rank and the change). The live-engagement / player-activity layer for gaming dashboards, analytics, esports and games-market tools. Distinct from the Steam store reader, the SteamSpy ownership reader, the review-sentiment reader and the Steam Market price reader — this is the live "who is playing what right now" data. Live from Steam; short cache only.
api.oanor.com/steamcharts-api