Steam
Steam is Valve's PC gaming platform and digital distribution storefront. Valve exposes the Steamworks Web API at https://api.steampowered.com/ — a constellation of HTTP interfaces for games, players, friends, achievements, items, the economy, leaderboards, remote storage, and the Steam Workshop. A subset of read-only interfaces are public (with a Steam Web API key); the full Steamworks set requires a publisher account and partner-restricted methods. There is no per-call fee for the Steamworks Web API itself; Valve monetizes through a $100 Steam Direct submission fee per product and a revenue share on store sales.
Limited machine-readable signal and partial portal coverage — documentation a human can read, but little a machine or agent can consume without scraping.
API Evangelist profiles Steam the way a machine reads it — 37 machine-readable artifacts across 1 API, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Steam scores 35.0/100 (thin), with a separate agent-readiness read of 23/100 (agent aware). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-08 · rubric v0.20.0
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</a>More shapes, themes and sizes → · Score as JSON · How badges work
How we profile Steam
Each block below is one kind of artifact we hold for Steam. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 25
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
ISteamNews
ISteamNews exposes per-game news feeds via GetNewsForApp. Path pattern http://api.steampowered.com/ISteamNews/
ISteamUserStats
ISteamUserStats provides global achievement percentages, schema for game stats and achievements, and per-user achievement / stats retrieval (GetGlobalAchievementPercentagesForAp...
ISteamUser
ISteamUser exposes player profile, friend list, and ban-status endpoints (GetPlayerSummaries, GetFriendList, GetPlayerBans, ResolveVanityURL).
ISteamUserAuth
ISteamUserAuth issues and validates Steam session tickets (AuthenticateUserTicket, AuthenticateUser) used by partner servers to verify a connecting player's Steam identity.
ISteamApps
ISteamApps exposes catalog and server queries (GetAppList, GetServersAtAddress, UpToDateCheck) used to enumerate Steam applications and validate version state.
ISteamCommunity
ISteamCommunity provides restricted access to Steam Community features (e.g., ReportAbuse) for trusted partners.
ISteamEconomy
ISteamEconomy is a secondary economy-system interface (GetAssetClassInfo, GetAssetPrices, FinalizeAssetTransaction) used to look up asset metadata and pricing for in-game items.
IGameInventory
IGameInventory is the primary inventory-economy interface used by partner servers to manipulate item ownership (AddItem, ConsumeItem, GetUserInventory, GetItemDefArchive).
IInventoryService
IInventoryService is the modern Steam Inventory Service interface used to add/remove/exchange items, manage definitions, and query inventories at scale.
ISteamGameServer
ISteamGameServer issues and manages persistent Game Server Login Tokens (GSLTs) used by dedicated game servers to authenticate to Steam.
ISteamRemoteStorage
ISteamRemoteStorage exposes Steam Cloud and UGC (user-generated content) storage endpoints — fetching files, retrieving UGC details, and listing published files.
ISteamLeaderboards
ISteamLeaderboards manages per-app leaderboards — creation, score upload/reset, and entry retrieval.
IPlayerService
IPlayerService exposes player-centric endpoints (GetOwnedGames, GetRecentlyPlayedGames, GetSteamLevel, GetBadges, IsPlayingSharedGame).
IGameNotificationsService
IGameNotificationsService delivers turn-based and prompt-style in-game notifications to players (UpdateNotificationSettings, UserCreateSession).
ISteamWebAPIUtil
ISteamWebAPIUtil provides helper endpoints — GetServerInfo (Steam server time/version) and GetSupportedAPIList (interfaces and methods callable by the API key).
IPublishedFileService
IPublishedFileService manages Steam Workshop / UGC published files — query, vote, change visibility, manage tags and previews.
IBroadcastService
IBroadcastService exposes Steam game-broadcast metadata and stream-discovery endpoints used for in-app broadcast lookups.
Steam Store API
An unofficial-but-widely-used set of storefront endpoints (https://store.steampowered.com/api/) returns app details, package details, currency conversion, and feature lists. Use...
ISteamCheckout
ISteamCheckout is the partner-only interface used to initiate, authorize, and finalize in-game microtransaction purchases through Steam Checkout.
ISteamMicroTxn
ISteamMicroTxn / ISteamMicroTxnSandbox handle the full microtransaction lifecycle — InitTxn, FinalizeTxn, GetReport, RefundTxn, QueryTxn — used by F2P and live-service titles.
ISteamDeepLinkService
ISteamDeepLinkService creates and resolves time-limited deep links into the Steam client and store, useful for marketing campaigns and partner referrals.
Steam IPlayerService API
The IPlayerService API from Steam — 3 operation(s) for iplayerservice.
Steam ISteamNews API
The ISteamNews API from Steam — 1 operation(s) for isteamnews.
Steam ISteamUser API
The ISteamUser API from Steam — 4 operation(s) for isteamuser.
Steam ISteamUserStats API
The ISteamUserStats API from Steam — 3 operation(s) for isteamuserstats.
Scroll within the panel for all 25 ·
Open Collections 6
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTIONSteamworks Web IPlayerService API
OPEN COLLECTIONSteamworks Web IPlayerService ISteamNews API
OPEN COLLECTIONSteamworks Web IPlayerService ISteamUser API
OPEN COLLECTIONSteamworks Web IPlayerService ISteamUserStats API
OPEN COLLECTIONSteamworks Web API
OPEN COLLECTIONPricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.
Published pricing tiers and plan structures.
Steam Plans Pricing
PLANSRate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Steam Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Steam Finops
FINOPSSecurity Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Steam — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 3
Portal, sign-up, and the first successful call
Documentation 5
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Build 2
SDKs, sample code, and the tooling you integrate with
Access & Security 3
Authentication, authorization, and security posture
Operate 6
Status, limits, changes, and where to get help
Commercial 5
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
Other 2
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/steam · machine-readable index on apis.io
This is an independent, third-party profile of Steam, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
info@apievangelist.com
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