steamwebapi-com

SteamWebAPI.com is a third‑party Steam market, inventory, profile, float and trade API provider, not Valve’s official Steam Web API. It offers production‑ready CS2 skin prices, Rust/Dota/TF2 market data, third‑party marketplace prices, Steam inventories, profile enrichment, float values, trade offer automation and Steam Guard workflows without building direct Steam scraping, marketplace scraping or handling Steam 429 rate‑limit errors. LLM and agent resources are available via llms.txt and related docs.

steamwebapi-com is listed with 2 APIs on the APIs.io network. Tagged areas include Steam, Gaming, Marketplace, Inventory, and API.

The steamwebapi-com catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

steamwebapi-com’s developer surface includes authentication, engineering blog, API reference, documentation, pricing, and 18 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

48.5/100 developing Agent 22/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

2 APIs

Steam Gaming Marketplace InventoryAPI

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 48.5/100 · developing

Contract Quality 9.7 / 21

Developer Ergonomics 6.5 / 17

Access Clarity 6.7 / 17

Operational Transparency 2.3 / 11

Contract Governance 8.1 / 10

Discoverability 4.9 / 9

Regulatory Posture 5.9 / 15

Agent readiness — 22/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

9 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 45.6 — up to +13.6 composite points
Developer Ergonomics scores 38.1 — up to +12.4 composite points
Access Clarity scores 39.5 — up to +12.1 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/steamwebapi-com/apis.yml: open an issue on github.com/api-evangelist/steamwebapi-com to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 2

Individual APIs this provider publishes, each with its own machine-readable definition.

SteamWebAPI

Complete Steam API documentation with live examples. Access Steam Market prices, player inventories, game data and more.

steamwebapi-com API

steamwebapi-com API as documented publicly: 73 operations. Contract generated from the documentation by API Evangelist (2026-10-31); not the provider's own document.

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Steamwebapi Com Context

26 classes · 31 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

steamwebapi-com API Rules

11 rules · 9 errors 1 warnings 1 info

SPECTRAL

JSON Schema 6

Standalone JSON Schema definitions for this provider's data models.

GetApiAssetsResponse

5 properties

JSON SCHEMA

GetSteamApiItemsPreviewResponse

6 properties

JSON SCHEMA

PostSteamApiItemsHistoryRequest

4 properties

JSON SCHEMA

PostSteamApiSteamloginsecureRequest

4 properties

JSON SCHEMA

PostSteamApiTradeCreateRequest

6 properties

JSON SCHEMA

PutSteamApiTradeAcceptRequest

3 properties

JSON SCHEMA

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Steamwebapi Com Authentication

1 scheme

SECURITY

Steamwebapi Com Domain Security

TLSv1.2 · DNSSEC · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Steamwebapi Com Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Resources

Documentation 2

Reference material describing how the API behaves

APIReference

APIReference

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

GitHubOrganization

GitHubOrganization

Access & Security 3

Authentication, authorization, and security posture

Authentication

Authentication

TrustCenter

TrustCenter

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

StatusPage

StatusPage

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Blog

Blog

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: steamwebapi-com
name: steamwebapi-com
description: SteamWebAPI.com is a third‑party Steam market, inventory, profile, float and trade API provider, not Valve’s
  official Steam Web API. It offers production‑ready CS2 skin prices, Rust/Dota/TF2 market data, third‑party marketplace prices,
  Steam inventories, profile enrichment, float values, trade offer automation and Steam Guard workflows without building direct
  Steam scraping, marketplace scraping or handling Steam 429 rate‑limit errors. LLM and agent resources are available via
  llms.txt and related docs.
url: https://artifacts.apis.io/steamwebapi-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-31 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-31'
modified: '2026-10-31'
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: Documentation is publicly readable but provides no OpenAPI, AsyncAPI, GraphQL SDL, or other machine‑readable specification.
  evidence:
  - url: https://www.steamwebapi.com/api/steam/documentation
    status: 200
  checked: '2026-10-31'
tags:
- Steam
- Gaming
- Marketplace
- Inventory
- API
image: http://www.steamwebapi.com/images/og/og-default.png
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Spectral
  url: rules/steamwebapi-com-rules.yml
- type: JSONLD
  url: json-ld/steamwebapi-com-context.jsonld
- type: Vocabulary
  url: vocabulary/steamwebapi-com-vocabulary.yml
- type: DataModel
  url: data-model/steamwebapi-com-data-model.yml
- type: Authentication
  url: authentication/steamwebapi-com-authentication.yml
- type: Conformance
  url: conformance/steamwebapi-com-conformance.yml
- type: LLMsTxt
  url: llms/steamwebapi-com-llms.txt
- type: WellKnown
  url: well-known/steamwebapi-com-well-known.yml
- type: Hosts
  url: hosts/steamwebapi-com-hosts.yml
- type: Vendors
  url: vendors/steamwebapi-com-vendors.yml
- type: SDKs
  url: packages/steamwebapi-com-packages.yml
- type: Packages
  url: packages/steamwebapi-com-packages.yml
- type: TrustCenter
  url: https://www.steamwebapi.com/trust
- type: Blog
  url: https://www.steamwebapi.com/blog/cs2-items-price-api
- type: APIReference
  url: https://www.steamwebapi.com/llms-full.txt
- type: DomainSecurity
  url: security/steamwebapi-com-domain-security.yml
- type: Website
  url: https://steamwebapi.com/
- type: Documentation
  url: https://www.steamwebapi.com/api/steam/documentation
- type: Pricing
  url: https://www.steamwebapi.com/pricing
- type: TermsOfService
  url: https://www.steamwebapi.com/legal/terms
- type: PrivacyPolicy
  url: https://www.steamwebapi.com/legal/privacy
- type: StatusPage
  url: https://status.steamwebapi.com
- type: GitHubOrganization
  url: https://github.com/steamwebapi
apis:
- name: SteamWebAPI
  description: Complete Steam API documentation with live examples. Access Steam Market prices, player inventories, game data
    and more.
  humanURL: https://www.steamwebapi.com/api/steam/documentation
  baseURL: https://www.steamwebapi.com/steam/api/
  aid: steamwebapi-com:steamwebapi
- aid: steamwebapi-com:steamwebapi-com-api
  name: steamwebapi-com API
  description: 'steamwebapi-com API as documented publicly: 73 operations. Contract generated from the documentation by API
    Evangelist (2026-10-31);

    not the provider''s own document.'
  humanURL: https://www.steamwebapi.com/api/doc.json
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/steamwebapi-com-openapi-generated.yml
    x-provenance: generated
  - type: JSONSchema
    url: json-schema/steamwebapi-com-get-steam-api-items-preview-response-schema.json
  - type: JSONSchema
    url: json-schema/steamwebapi-com-post-steam-api-trade-create-request-schema.json
  - type: JSONSchema
    url: json-schema/steamwebapi-com-post-steam-api-steamloginsecure-request-schema.json
  - type: JSONSchema
    url: json-schema/steamwebapi-com-get-api-assets-response-schema.json
  - type: JSONSchema
    url: json-schema/steamwebapi-com-post-steam-api-items-history-request-schema.json
  - type: JSONSchema
    url: json-schema/steamwebapi-com-put-steam-api-trade-accept-request-schema.json
x-enrichment:
  date: '2026-10-31'
  status: enriched
  artifacts_added: 36
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

steamwebapi-com — frequently asked questions

Does steamwebapi-com have an API?

Yes. APIs.io lists 2 APIs from steamwebapi-com, including SteamWebAPI and steamwebapi-com API.

Is there an OpenAPI specification for the steamwebapi-com?

Yes. APIs.io indexes 1 OpenAPI specification for steamwebapi-com, each linked for download from this page.

How do I authenticate with the steamwebapi-com?

steamwebapi-com uses bearer-token authentication (1 scheme). The details are profiled on APIs.io as Steamwebapi Com Authentication.

Is the steamwebapi-com ready for AI agents?

steamwebapi-com has a Kin Score of 48.5 out of 100 (developing) and an Agent Readiness score of 21.5 (agent-aware), scored by API Evangelist on 2026-10-31.

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