openapi
(4)
The API Was Ready. The Welcome Mat Wasn’t.
An API can work perfectly and still be miserable to use. Fern made a business of the awkward distance between a finished endpoint and a developer’s first successful call.
ReadMe
How a one-person side project with an owl mascot became the documentation layer for NVIDIA, Amazon, and thousands of other API companies - and why it stayed profitable while barely raising money.
GitBook
The documentation platform that started as an open-source tool for developers now wants to keep the world's product docs honest - for humans and the AI agents reading over their shoulder.
Speakeasy
Speakeasy is a San Francisco developer-infrastructure company that turns an OpenAPI specification into production-grade, type-safe SDKs across ten-plus languages, then keeps them in sync automatically as the API changes. Founded in 2022 by Sagar Batchu and Simon Yu, it has expanded from SDK and Terraform-provider generation into an AI control plane for the Model Context Protocol - products like Gram and the MCP Gateway let companies expose their APIs as governed tools for AI agents. Speakeasy has raised roughly $26 million, including a $15M Series A led by FPV Ventures in 2024, and counts Vercel, Mistral AI, Clerk, Kong, Fivetran, Airbyte, and SolarWinds among its customers.