ArcadeIndex

Find web games from a natural-language query plus optional filters (genre, mood, session length, players, quality, content rating, difficulty, inputs). Phrases like 'for kids', '2 player', 'under 10 minutes', 'not a shooter', 'easy' or 'chill' are turned into filters (echoed as interpreted_filters); explicit params win. 'like {title}' or 'similar to {title}' naming a game in the catalog returns that game's games_like results (anchor is set). Returns only published, playable games verified within the last 8 days (listing-only games with include_listing_only=true; plays=here or plays=developer_site picks one kind). content_rating_max defaults to teen. Zero results is a success with code NO_MATCHES and up to 3 executed relaxations whose args you can call again (with the tool named in tool, when set). Quote match_reasons and link play_url; render 'via ArcadeIndex' per the attribution block.

Full details of one game by id or {slug}-{id}. Aliased ids resolve to the canonical game (requested_id is set). Also returns listing-only, stale or suspect games: do NOT present play_url as instantly playable unless play_ready is true. Errors: NOT_FOUND (unknown, unavailable or not public), GONE (delisted).

Games trending over the last day or week (genre scope when genre is set). trending_basis says whether play data or the recency fallback was used. Returns only published, playable games verified within the last 8 days (listing-only games with include_listing_only=true; plays=here or plays=developer_site picks one kind). content_rating_max defaults to teen. Zero results is a success with code NO_MATCHES and up to 3 executed relaxations whose args you can call again (with the tool named in tool, when set). Quote match_reasons and link play_url; render 'via ArcadeIndex' per the attribution block.

Games similar to an anchor game, ordered by similarity, each with similarity_reasons. Returns only published, playable games verified within the last 8 days (listing-only games with include_listing_only=true; plays=here or plays=developer_site picks one kind). content_rating_max defaults to teen. Zero results is a success with code NO_MATCHES and up to 3 executed relaxations whose args you can call again (with the tool named in tool, when set). Quote match_reasons and link play_url; render 'via ArcadeIndex' per the attribution block.

One random eligible game for 'surprise me' flows; pass seed for a deterministic pick. Never returns Mature games. Zero eligible games gives game: null with code NO_MATCHES and relaxations.

Games published in the last 30 days, newest first. Returns only published, playable games verified within the last 8 days (listing-only games with include_listing_only=true; plays=here or plays=developer_site picks one kind). content_rating_max defaults to teen. Zero results is a success with code NO_MATCHES and up to 3 executed relaxations whose args you can call again (with the tool named in tool, when set). Quote match_reasons and link play_url; render 'via ArcadeIndex' per the attribution block.

Play an ArcadeIndex game right inside the chat. Pass game_id (an id, {slug}-{id}, or a game's url from search_games, trending, games_like or new_games results) or query (the top search hit is played; a game that only plays on its developer's site comes back as link_out). Hosts that support MCP Apps show a player with Next game and More like this (mode player); some chat apps do not allow the game frame yet, and then the player offers the game on arcadeindex.io in a new tab, so do not tell the user the game is running in the chat unless they say so. Games that cannot be framed here (listing-only, not checked in the last 8 days, Mature, or a site the chat app does not allow) return mode link_out with link_out.url and the reason: give the user that link. Hosts without MCP Apps get the same data as text: link play_url. Errors: NOT_FOUND, INVALID_ARGUMENT.