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Playground demo key · api.reefapi.com
post/steam-games/v1/similar_games1 credit

recommended similar games (appids) via /recommended/morelike

Working example
Parameters

Steam application id (the number in a store URL, e.g. 730 = CS2).

How many items to return (1-50). Clamped to range. (1–50)

request preview
curl -X POST https://api.reefapi.com/steam-games/v1/similar_games \
  -H "x-api-key: $REEF_KEY" \
  -H "content-type: application/json" \
  -d '{"appid":"1245620","count":"6"}'

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