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Playground demo key · api.reefapi.com
post/steam-games/v1/most_played1 credit

Official Steam most-played chart — live concurrent player count + 24h peak per game (the only keyless source of all-time/period peak). Optionally enrich rows with names.

Working example
Parameters
request preview
curl -X POST https://api.reefapi.com/steam-games/v1/most_played \
  -H "x-api-key: $REEF_KEY" \
  -H "content-type: application/json" \
  -d '{"count":"5"}'

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Playground · ReefAPI