Stainless website screenshot

Stainless

Stainless is a New York-based developer-tools company that turns an OpenAPI specification into a portfolio of high-quality, idiomatic SDKs, reference documentation, MCP servers, CLIs, and Terraform providers. The platform was founded by veterans of Stripe, Heroku, and Twilio with the explicit goal of bringing Stripe-quality developer experience to any API, and is used by AI-platform and infrastructure companies including OpenAI, Anthropic, Google DeepMind, Cloudflare, Modern Treasury, Perplexity, Replicate, LangChain, Beeper, and Runway. Stainless supports nine target languages today (TypeScript, Python, Go, Java, Kotlin, Ruby, PHP, C#, plus a CLI) and publishes generated code under the Apache 2.0 license into customer-owned GitHub repositories. The company exposes its own platform as a REST API at api.stainless.com (v0), with endpoints for managing organizations, projects, branches, builds, and the current user, plus a build-compare endpoint and matching client libraries. Stainless also ships the Stainless Studio (web-based config UI), the Stainless CLI, a Language Server, GitHub member sync, breaking-change detection, SSO, audit logs, and integrations with documentation hosts (Bump.sh, GitBook, Mintlify, ReadMe).

Stainless publishes 5 APIs on the APIs.io network, including Build Target Outputs API, Builds API, Orgs API, and 2 more. Tagged areas include SDK Generation, OpenAPI, API Tooling, Developer Experience, and MCP.

Stainless’ developer surface includes authentication, documentation, API reference, pricing, engineering blog, changelog, CLI, and 16 more developer resources.

41.3/100 thin ▬ flat Agent 31/100 agent aware Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1
AccessFreeSelf serve⚡ Free to try
6 APIs
SDK GenerationOpenAPIAPI ToolingDeveloper ExperienceMCPModel Context ProtocolDocumentationCode GenerationTerraform ProviderAPI ReferenceDevToolsAPI First

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1
Composite quality — 41.3/100 · thin
Contract Quality 13.6 / 25
Developer Ergonomics 7.0 / 20
Commercial Clarity 7.9 / 20
Operational Transparency 5.5 / 13
Governance 0.0 / 12
Discoverability 7.4 / 10
Agent readiness — 31/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/stainless-api: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 6

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

Stainless Platform API

The Stainless Platform API is a REST API for programmatically managing Stainless projects, branches, and SDK builds. It exposes the same primitives that power the Stainless Stud...

Stainless Build Target Outputs API

The Build Target Outputs API from Stainless — 1 operation(s) for build target outputs.

Stainless Builds API

The Builds API from Stainless — 4 operation(s) for builds.

Stainless Orgs API

The Orgs API from Stainless — 2 operation(s) for orgs.

Stainless Projects API

The Projects API from Stainless — 9 operation(s) for projects.

Stainless User API

The User API from Stainless — 1 operation(s) for user.

Open Collections 1

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Stainless Platform API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Rate Limits 1

Documented rate limits and quota policies.

Stainless Api Rate Limits

2 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Security Posture 3

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

Stainless Api Authentication

http · 1 scheme

SECURITY

Stainless Api Domain Security

TLSv1.3 · DMARC

SECURITY

Stainless Api Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Stainless Api Agentic Access

22 operations · 10 acting · 1 human-in-the-loop

22 operations · 10 acting

AGENTIC

Resources

Documentation 2

Reference material describing how the API behaves

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

Build 4

SDKs, sample code, and the tooling you integrate with

Access & Security 3

Authentication, authorization, and security posture

Operate 2

Status, limits, changes, and where to get help

Commercial 1

Pricing, plans, and the legal terms of use

Company 5

The organization behind the API

Other 4

Properties that don't map to a standard resource type

Source (apis.yml)

apis.yml Raw ↑
aid: stainless-api
name: Stainless
description: Stainless is a New York-based developer-tools company that turns an OpenAPI specification into a portfolio of
  high-quality, idiomatic SDKs, reference documentation, MCP servers, CLIs, and Terraform providers. The platform was founded
  by veterans of Stripe, Heroku, and Twilio with the explicit goal of bringing Stripe-quality developer experience to any
  API, and is used by AI-platform and infrastructure companies including OpenAI, Anthropic, Google DeepMind, Cloudflare, Modern
  Treasury, Perplexity, Replicate, LangChain, Beeper, and Runway. Stainless supports nine target languages today (TypeScript,
  Python, Go, Java, Kotlin, Ruby, PHP, C#, plus a CLI) and publishes generated code under the Apache 2.0 license into customer-owned
  GitHub repositories. The company exposes its own platform as a REST API at api.stainless.com (v0), with endpoints for managing
  organizations, projects, branches, builds, and the current user, plus a build-compare endpoint and matching client libraries.
  Stainless also ships the Stainless Studio (web-based config UI), the Stainless CLI, a Language Server, GitHub member sync,
  breaking-change detection, SSO, audit logs, and integrations with documentation hosts (Bump.sh, GitBook, Mintlify, ReadMe).
type: Index
accessModel:
  pricing: free
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Free · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
position: Provider
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/stainless-api.png
tags:
- SDK Generation
- OpenAPI
- API Tooling
- Developer Experience
- MCP
- Model Context Protocol
- Documentation
- Code Generation
- Terraform Provider
- API Reference
- DevTools
- API First
url: https://raw.githubusercontent.com/api-evangelist/stainless-api/refs/heads/main/apis.yml
created: '2026-05-23'
modified: '2026-05-23'
specificationVersion: '0.20'
apis:
- aid: stainless-api:stainless-platform-api
  name: Stainless Platform API
  description: The Stainless Platform API is a REST API for programmatically managing Stainless projects, branches, and SDK
    builds. It exposes the same primitives that power the Stainless Studio web UI and CLI, allowing customers to create and
    update projects, manage branches that track different OpenAPI versions, trigger and inspect builds across the nine supported
    languages, compare two builds, and read organization and current-user information. The API is served from api.stainless.com
    under the v0 namespace and is consumed via official Stainless client libraries in TypeScript, Python, Go, Java, Kotlin,
    Ruby, PHP, and C#, plus the Stainless CLI.
  humanURL: https://www.stainless.com/docs/api-reference
  baseURL: https://api.stainless.com/v0
  tags:
  - SDK Generation
  - OpenAPI
  - Builds
  - Projects
  - Branches
  - Developer Platform
  properties:
  - type: Documentation
    url: https://www.stainless.com/docs
  - type: APIReference
    url: https://www.stainless.com/docs/api-reference
  - type: GettingStarted
    url: https://www.stainless.com/docs/get-started
  - type: GitHubOrganization
    url: https://github.com/stainless-api
  - type: TypeScriptSDK
    url: https://github.com/stainless-api/stainless-node
  - type: PythonSDK
    url: https://github.com/stainless-api/stainless-python
  - type: GoSDK
    url: https://github.com/stainless-api/stainless-go
  - type: JavaSDK
    url: https://github.com/stainless-api/stainless-java
  - type: KotlinSDK
    url: https://github.com/stainless-api/stainless-kotlin
  - type: RubySDK
    url: https://github.com/stainless-api/stainless-ruby
  - type: CLI
    url: https://github.com/stainless-api/stainless-cli
  - type: MCPFront
    url: https://github.com/stainless-api/mcp-front
  features:
  - name: Project Management
    description: Create, list, retrieve, and update Stainless projects via REST.
  - name: Branch Management
    description: Create, list, and delete branches that track OpenAPI versions.
  - name: Build Lifecycle
    description: Trigger SDK builds, list builds, retrieve build status, and inspect output.
  - name: Build Comparison
    description: Compare two builds to surface diffs across generated SDKs.
  - name: Organization and User
    description: Read organization membership and current-user information.
  - name: Multi-Language SDKs
    description: Official client libraries in nine languages plus a CLI.
  - name: GitHub Publishing
    description: Generated SDKs are published into customer-owned GitHub repositories.
  - name: Breaking Change Detection
    description: Surface breaking changes between builds before publishing.
  useCases:
  - name: Automated SDK Pipelines
    description: Wire Stainless builds into CI to ship SDKs on every API release.
  - name: API-Spec-Driven Documentation
    description: Generate reference docs and MCP servers from the same OpenAPI source.
  - name: Multi-Spec Coordination
    description: Manage multiple OpenAPI specs (e.g., per service) under one platform.
  - name: Enterprise Governance
    description: Use SSO, audit logs, and member sync for regulated environments.
  - name: Agent-Ready APIs
    description: Generate MCP servers so APIs are usable by AI agents alongside SDKs.
  integrations:
  - name: GitHub
  - name: Bump.sh
  - name: GitBook
  - name: Mintlify
  - name: ReadMe
  - name: NPM
  - name: PyPI
  - name: Maven Central
  - name: RubyGems
  - name: Packagist
  - name: NuGet
  - name: Go Modules
  authentication:
  - type: Bearer
    description: API requests are authenticated with a bearer access token issued from the Stainless dashboard.
- aid: stainless-api:stainless-api-build-target-outputs-api
  name: Stainless Build Target Outputs API
  description: The Build Target Outputs API from Stainless — 1 operation(s) for build target outputs.
  humanURL: https://www.stainless.com/docs/api-reference
  baseURL: https://api.stainless.com/v0
  tags:
  - Build Target Outputs
  properties:
  - type: OpenAPI
    url: openapi/stainless-api-build-target-outputs-api-openapi.yml
- aid: stainless-api:stainless-api-builds-api
  name: Stainless Builds API
  description: The Builds API from Stainless — 4 operation(s) for builds.
  humanURL: https://www.stainless.com/docs/api-reference
  baseURL: https://api.stainless.com/v0
  tags:
  - Builds
  properties:
  - type: OpenAPI
    url: openapi/stainless-api-builds-api-openapi.yml
- aid: stainless-api:stainless-api-orgs-api
  name: Stainless Orgs API
  description: The Orgs API from Stainless — 2 operation(s) for orgs.
  humanURL: https://www.stainless.com/docs/api-reference
  baseURL: https://api.stainless.com/v0
  tags:
  - Orgs
  properties:
  - type: OpenAPI
    url: openapi/stainless-api-orgs-api-openapi.yml
- aid: stainless-api:stainless-api-projects-api
  name: Stainless Projects API
  description: The Projects API from Stainless — 9 operation(s) for projects.
  humanURL: https://www.stainless.com/docs/api-reference
  baseURL: https://api.stainless.com/v0
  tags:
  - Projects
  properties:
  - type: OpenAPI
    url: openapi/stainless-api-projects-api-openapi.yml
- aid: stainless-api:stainless-api-user-api
  name: Stainless User API
  description: The User API from Stainless — 1 operation(s) for user.
  humanURL: https://www.stainless.com/docs/api-reference
  baseURL: https://api.stainless.com/v0
  tags:
  - User
  properties:
  - type: OpenAPI
    url: openapi/stainless-api-user-api-openapi.yml
common:
- type: AgenticAccess
  url: agentic-access/stainless-api-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/stainless-api-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/stainless-api-domain-security.yml
- type: Authentication
  url: authentication/stainless-api-authentication.yml
- type: Website
  url: https://www.stainless.com
- type: Documentation
  url: https://www.stainless.com/docs
- type: APIReference
  url: https://www.stainless.com/docs/api-reference
- type: Pricing
  url: https://www.stainless.com/pricing
- type: Customers
  url: https://www.stainless.com/customers
- type: Blog
  url: https://www.stainless.com/blog
- type: ChangeLog
  url: https://www.stainless.com/changelog
- type: Careers
  url: https://www.stainless.com/careers
- type: Contact
  url: https://www.stainless.com/contact
- type: Studio
  url: https://app.stainless.com
- type: GitHubOrganization
  url: https://github.com/stainless-api
- type: TypeScriptSDK
  url: https://github.com/stainless-api/stainless-node
- type: PythonSDK
  url: https://github.com/stainless-api/stainless-python
- type: CLI
  url: https://github.com/stainless-api/stainless-cli
- type: MCPFront
  url: https://github.com/stainless-api/mcp-front
- type: STLAPI
  url: https://github.com/stainless-api/stl-api
- type: Email
  url: mailto:support@stainless.com
- type: LinkedIn
  url: https://www.linkedin.com/company/stainless-api
- type: Twitter
  url: https://twitter.com/StainlessAPI
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com