Stainless is a SaaS platform that consumes OpenAPI specifications to automatically generate production‑ready SDKs for over ten languages, up‑to‑date interactive documentation, and Model Context Protocol servers for LLM agents. The system integrates with CI/CD pipelines to version artifacts via GitHub pull requests, eliminating manual code maintenance and reducing integration overhead for API product teams.
Funding
$25M raised to dateRaised to date based on public sources. This may differ from the amount the company actually raised and is based only on what is publicly available on the internet.
Founders
Product
Problem
API providers must manually write and maintain client libraries, documentation sites, and agent‑ready interfaces, which introduces boilerplate (HTTP handling, retries, pagination, streaming), version drift, and high engineering overhead. This slows developer onboarding and hampers reliable integration with AI agents.
Solution
Stainless delivers a SaaS platform that consumes an OpenAPI specification and automatically generates production‑ready SDKs, interactive documentation, and Model Context Protocol (MCP) servers. The generated SDKs include built‑in exponential‑backoff retries, pagination helpers, streaming support, webhook verification, and type‑safe client code for languages such as TypeScript, Python, Go, Java, Kotlin, Ruby, C#, PHP, and Terraform. The Docs platform creates a statically generated, component‑driven site that stays in sync with the API spec and offers AI‑powered search and chat. MCP servers expose the API to LLM‑based agents with minimal token usage. All artifacts are versioned via GitHub pull requests, enabling continuous delivery without manual code changes.
Target Audience
API product teams, platform engineers, and developer relations groups at SaaS, AI, and infrastructure companies that need fast, reliable SDKs, up‑to‑date developer docs, and LLM‑compatible endpoints.
Features
- OpenAPI‑driven code generation for 10+ target languages, producing idiomatic, hand‑crafted‑style client libraries.
- Automatic handling of common concerns: exponential‑backoff retries, cursor/offset pagination, Server‑Sent Events, file uploads, and webhook signature verification.
- Docs Platform built on Astro that renders Markdown/MDX, supports custom UI components, AI chat, and deploys to Cloudflare or private clouds with zero‑runtime validation.
- MCP server generator that creates agent‑ready endpoints, exposing typed SDK calls to LLMs while minimizing token consumption.
- CI/CD integration: preview builds generate diff PRs on spec changes, with support for custom code extensions that persist across regenerations.
- Enterprise add‑ons such as SSO/SCIM, audit logs, breaking‑change detection, version pinning, and dedicated support SLAs.
- Usage‑based pricing model per “generator” (SDK, Docs site, or MCP server) with tiered plans and volume discounts.