Steam Deck rating for a game: Verified, Playable, Unsupported, or Unknown.

Resolve a Steam vanity/custom-URL name (or profile URL) to a SteamID64.

Get profile + current status for one or more Steam users.

Get a user's Steam community level (the XP-based account level).

Get VAC / game / community / economy ban status for a user.

List a user's Steam friends, enriched with name and current status.

List which of a user's friends own (or are playing) a specific game — "who can I play X with" (about friends' libraries, not store search).

List the games a user owns, with total and recent hours played.

List games a user has played in the last two weeks, with hours.

Get a user's achievement progress for a specific game.

Get the achievement and stat definitions for a game (not user-specific).

Get the global unlock percentage (rarity) of each achievement in a game.

Get a user's in-game STATS for a specific game (kills, wins, distance, etc.).

Show a player's RAREST unlocked achievements in a game (by global unlock %).

Look up a game's appid by its title — when you already know the name and need its ID (not for discovery, recommendations, or buy decisions).

Get comprehensive store details for a game — the best 'tell me about X' tool.

List a game's DLC (add-ons), optionally with live prices and sale status.

Get a game's top community tags (Souls-like, Roguelike, Cozy, …) by weight.

Discover games by criteria — tags, max price, on-sale, platform — optionally personalized to a user's taste; for filter-based search, not "games like X" (use steam_recommend for that).

Get the review score and sample reviews for a game (lifetime and/or recent).

List games currently ON SALE (featured specials) on the Steam store.

List a Steam storefront section: top sellers, new releases, or coming soon.

Get a user's Steam wishlist, optionally with live prices and sale status.

Get the number of players currently in-game for a title (live concurrency).

Get recent news/update posts for a game (patch notes, announcements).

Get a user's badges and the XP breakdown behind their Steam level.

Get store details for a Steam package (a sub/bundle of one or more games).

Compare two users' libraries: shared games and who has played each more.

Analyze a whole game library: backlog, playtime distribution, abandoned games.

Decide whether to buy ONE specific game — price, recent + lifetime reviews, tags, Metacritic, and taste match in one call; for evaluating a single known game, not finding new ones.

Recommend games similar to a seed game ("like Hades") or to a user's taste, explaining the shared tags; for "games like X" / "what should I play" (for filtered search use steam_discover).

Find co-op games the host and their friends all own — for game night.

Compare a game's price across regions (each in its own local currency).

Get metadata for a Steam Workshop item (mod, map, guide, collection, …).

List the Steam groups (communities/clans) a user belongs to.

List a user's Steam inventory — game items or generic Community items.

Get the Community Market price for a single item, with rarity and condition.