Stainless uses AI to generate SDKs from API specs automatically, producing libraries in languages such as Python, TypeScript, Kotlin, and Go. Its platform pushes updates as APIs evolve and supports versioning and changelogs, while generating an initial config teams can fine-tune. Customers include OpenAI, Anthropic, Meta, Runway, Groq, Cerebras, Modern Treasury, and Cloudflare. Stainless reports “hundreds” of paying customers and says its SDKs are downloaded tens of millions of times every week; most customers pay for its enterprise tier. Pricing ranges from a free single-SDK option up to $250/month to $30,000/year for multi-SDK packages. The company’s annual recurring revenue is hovering around $1 million and it is nearing profitability as it pursues a broader API platform vision beyond SDKs. Stainless ingests API specs and produces polished SDKs across languages like Python, TypeScript, Kotlin, Go and Java, while handling versioning and changelogs as APIs evolve. The product uses generative AI to produce an initial configuration that customers can fine‑tune, which the founder says is especially valuable for AI companies with novice developers. Customers include OpenAI, Anthropic, Together AI, Lithic, LangChain, Orb, Modern Treasury and Cloudflare; the company reports “dozens” of paying clients in its beta. Some generated SDKs — notably OpenAI’s Python SDK — are receiving millions of downloads per week. Stainless monetizes via a free single‑SDK publishing tier and a paid enterprise tier (most customers pay enterprise), with pricing ranging from $250/month to $30,000/year. Founder Alex Rattray bootstrapped the business with revenue from day one, and annual recurring revenue is hovering around $1 million; he expects the company could be profitable as soon as this year and plans to expand the product line and headcount.

Total raised

$29M

Funding rounds

2

Latest round

Series A

Latest activity

Dec 2024