Stainless

Stainless is an API developer experience platform that generates best-in-class SDKs, interactive documentation, production-ready CLI tools, MCP servers, and Terraform providers directly from an OpenAPI specification. Trusted by Anthropic, Cloudflare, Google, and OpenAI, Stainless automates the boilerplate of client library development including HTTP requests, retries with exponential backoff, streaming, and pagination. The platform supports TypeScript, Python, Go, Java, Kotlin, Ruby, C#, PHP, and Terraform, with Rust and Swift in development.

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

The Stainless catalog on APIs.io includes 1 JSON-LD context.

Stainless’ developer surface includes authentication, developer portal, documentation, pricing, engineering blog, changelog, and 10 more developer resources.

🌐 Visit website 📡 Source on GitHub

29.4/100 thin ▬ flat Agent 20/100 agent aware saas Full breakdown ↓
scored 2026-09-14 · rubric v0.22.0

AccessFreemiumSelf serve⚡ Free to try

1 APIs

Code Generation Documentation Developer Experience MCP Platform SDK Terraform

Kin Score

Kin Score How this is scored →
scored 2026-09-14 · rubric v0.22.0

Composite quality — 29.4/100 · thin

Contract Quality 1.2 / 23

Developer Ergonomics 8.1 / 18

Access Clarity 9.0 / 18

Operational Transparency 3.4 / 12

Contract Governance 0.0 / 11

Discoverability 5.3 / 9

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 20/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

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 github.com/api-evangelist/stainless: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 10

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

Stainless SDK Generator

Generate production-ready SDKs in TypeScript, Python, Go, Java, Kotlin, Ruby, C#, PHP, and Terraform from an OpenAPI specification. Stainless handles HTTP requests, retries with...

Stainless Docs Platform

The Stainless Docs Platform combines your API reference, usage examples, and narrative guides into a single, cohesive experience that evolves with your API. Go from an OpenAPI s...

Stainless MCP Servers

Stainless generates production-ready MCP (Model Context Protocol) servers optimized for agentic coding and context limits directly from an OpenAPI spec. Production-grade capabil...

Stainless CLI

The Stainless CLI generates production-ready command-line interfaces from an OpenAPI specification. Generated CLIs provide a consistent, typed interface for interacting with any...

Stainless Terraform Providers

Stainless generates production-ready Terraform providers from an OpenAPI specification, enabling infrastructure-as-code access to any REST API without manual Terraform provider ...

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.

Scroll for all 10

Open Collections 7

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

API Collection

OPEN COLLECTION

Stainless Platform Build Target Outputs API

OPEN COLLECTION

Stainless Platform Build Target Outputs Builds API

OPEN COLLECTION

Stainless Platform Build Target Outputs Orgs API

OPEN COLLECTION

Stainless Platform Build Target Outputs Projects API

OPEN COLLECTION

Stainless Platform Build Target Outputs User API

OPEN COLLECTION

Stainless Platform API

OPEN COLLECTION

Scroll for all 7

Pricing Plans 1

Published pricing tiers and plan structures.

Stainless Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Stainless Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Stainless Finops

FINOPS

Semantic Vocabularies 1

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

Stainless Context

18 classes · 4 properties

JSON-LD

Examples 1

Example request and response payloads for these APIs.

Stainless Sdk Generation Example

4 fields

EXAMPLE

Security Posture 3

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

Stainless Authentication

http · 1 scheme

SECURITY

Stainless Domain Security

TLSv1.3 · DMARC

SECURITY

Stainless Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access 1

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

Stainless Agentic Access

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

22 operations · 10 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

Portal

Portal

Login

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 3

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

ChangeLog

ChangeLog

Commercial 2

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

Company 4

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

About

About

Other 1

Properties that don't map to a standard resource type

Customers

Customers

Source (apis.yml)

aid: stainless
url: https://raw.githubusercontent.com/api-evangelist/stainless/refs/heads/main/apis.yml
name: Stainless
description: Stainless is an API developer experience platform that generates best-in-class SDKs, interactive documentation,
  production-ready CLI tools, MCP servers, and Terraform providers directly from an OpenAPI specification. Trusted by Anthropic,
  Cloudflare, Google, and OpenAI, Stainless automates the boilerplate of client library development including HTTP requests,
  retries with exponential backoff, streaming, and pagination. The platform supports TypeScript, Python, Go, Java, Kotlin,
  Ruby, C#, PHP, and Terraform, with Rust and Swift in development.
tags:
- Code Generation
- Documentation
- Developer Experience
- MCP
- Platform
- SDK
- Terraform
tags_raw:
- Code Generation
- Documentation
- Developer Experience
- MCP
- Platform
- SDKs
- Terraform
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/stainless.png
access: 3rd-Party
created: '2025-01-08'
modified: '2026-05-02'
position: Consuming
segments:
- SDKs
- Developer Tooling
common:
- type: Website
  url: https://www.stainless.com/
- type: AgenticAccess
  url: agentic-access/stainless-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/stainless-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/stainless-domain-security.yml
- type: Authentication
  url: authentication/stainless-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/stainless-api
- url: https://www.stainless.com/
  type: Portal
- url: https://www.stainless.com/docs/
  type: Documentation
- url: https://www.stainless.com/pricing
  type: Pricing
- url: https://www.stainless.com/blog
  type: Blog
- url: https://www.stainless.com/changelog
  type: ChangeLog
- url: https://app.stainless.com/login
  type: Login
- url: https://www.stainless.com/company
  type: About
- url: https://github.com/stainless-api
  type: GitHubOrganization
- url: https://www.stainless.com/legal/terms-conditions
  type: TermsOfService
- url: https://www.stainless.com/customers
  type: Customers
apis:
- aid: stainless:stainless
  name: Stainless SDK Generator
  tags:
  - Code Generation
  - Developer Experience
  - SDK
  tags_raw:
  - Code Generation
  - Developer Experience
  - SDKs
  humanURL: https://www.stainless.com/
  description: Generate production-ready SDKs in TypeScript, Python, Go, Java, Kotlin, Ruby, C#, PHP, and Terraform from an
    OpenAPI specification. Stainless handles HTTP requests, retries with exponential backoff, streaming, pagination, and idiomatic
    patterns for each language. Trusted by Anthropic, Cloudflare, Google, and OpenAI.
  properties:
  - url: https://www.stainless.com/
    type: Documentation
  - url: https://www.stainless.com/docs/
    type: GettingStarted
  - url: https://www.stainless.com/pricing
    type: Pricing
  - url: https://www.stainless.com/customers
    type: Customers
  - url: https://github.com/stainless-api/upload-openapi-spec-action
    type: GitHubAction
  - url: https://github.com/stainless-api/build-sdk-action
    type: GitHubAction
- aid: stainless:stainless-docs-platform
  name: Stainless Docs Platform
  tags:
  - API Reference
  - Developer Experience
  - Documentation
  humanURL: https://www.stainless.com/products/docs
  description: The Stainless Docs Platform combines your API reference, usage examples, and narrative guides into a single,
    cohesive experience that evolves with your API. Go from an OpenAPI spec to a live, interactive documentation site in minutes
    with a developer-centric docs-as-code workflow built on Astro. Deploys to Cloudflare or custom clouds.
  properties:
  - url: https://www.stainless.com/products/docs
    type: Documentation
  - url: https://www.stainless.com/docs/docs-platform/
    type: GettingStarted
- aid: stainless:stainless-mcp-servers
  name: Stainless MCP Servers
  tags:
  - AI Agents
  - Code Generation
  - MCP
  humanURL: https://www.stainless.com/products/mcp
  description: Stainless generates production-ready MCP (Model Context Protocol) servers optimized for agentic coding and
    context limits directly from an OpenAPI spec. Production-grade capabilities including OAuth, SSE, and remote servers are
    included by default. Generated MCP servers use a code tool architecture enabling seamless integration with Claude Desktop,
    Cursor, and other MCP clients.
  properties:
  - url: https://www.stainless.com/products/mcp
    type: Documentation
  - url: https://www.stainless.com/docs/targets/mcp/
    type: GettingStarted
  - url: https://www.stainless.com/mcp
    type: Portal
- aid: stainless:stainless-cli
  name: Stainless CLI
  tags:
  - CLI
  - Code Generation
  - Developer Tools
  humanURL: https://www.stainless.com/docs/
  description: The Stainless CLI generates production-ready command-line interfaces from an OpenAPI specification. Generated
    CLIs provide a consistent, typed interface for interacting with any API from the terminal.
  properties:
  - url: https://www.stainless.com/docs/
    type: Documentation
- aid: stainless:stainless-terraform
  name: Stainless Terraform Providers
  tags:
  - Code Generation
  - Infrastructure as Code
  - Terraform
  humanURL: https://www.stainless.com/docs/
  description: Stainless generates production-ready Terraform providers from an OpenAPI specification, enabling infrastructure-as-code
    access to any REST API without manual Terraform provider development.
  properties:
  - url: https://www.stainless.com/docs/
    type: Documentation
- aid: stainless:stainless-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/
  tags:
  - Build Target Outputs
  properties:
  - type: OpenAPI
    url: openapi/stainless-build-target-outputs-api-openapi.yml
- aid: stainless:stainless-builds-api
  name: Stainless Builds API
  description: The Builds API from Stainless — 4 operation(s) for builds.
  humanURL: https://www.stainless.com/
  tags:
  - Builds
  properties:
  - type: OpenAPI
    url: openapi/stainless-builds-api-openapi.yml
- aid: stainless:stainless-orgs-api
  name: Stainless Orgs API
  description: The Orgs API from Stainless — 2 operation(s) for orgs.
  humanURL: https://www.stainless.com/
  tags:
  - Organization
  tags_raw:
  - Orgs
  properties:
  - type: OpenAPI
    url: openapi/stainless-orgs-api-openapi.yml
- aid: stainless:stainless-projects-api
  name: Stainless Projects API
  description: The Projects API from Stainless — 9 operation(s) for projects.
  humanURL: https://www.stainless.com/
  tags:
  - Project
  tags_raw:
  - Projects
  properties:
  - type: OpenAPI
    url: openapi/stainless-projects-api-openapi.yml
- aid: stainless:stainless-user-api
  name: Stainless User API
  description: The User API from Stainless — 1 operation(s) for user.
  humanURL: https://www.stainless.com/
  tags:
  - User
  properties:
  - type: OpenAPI
    url: openapi/stainless-user-api-openapi.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
specificationVersion: '0.23'

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