6 API companies in New York.
By the Numbers
Fern
New York
Fern helps software companies build an API experience; founded in 2022 and headquartered in Williamsburg, Brooklyn, it develops open-source software with a small team, backed by Bessemer Venture Partners and Y Combinator, and was acquired b
Svix
Svix positions itself as 'SendGrid for webhooks', a growing startup building server-to-server communications; backed by Y Combinator, Aleph, and a16z, with customers including Brex, Lob, Benchling, Drata, and Fortune 500, and a distributed
Axle.insure
Axle is building the first AI-native clearinghouse for insurance, creating a universal API to securely access and bridge insurance data for lenders and brands like Hertz, Avis, and Audi, backed by Y Combinator and Gradient Ventures.
Doola
doola provides a Business-in-a-Box platform that forms LLCs, sets up bank accounts, enables payments, and manages compliance and taxes for creators, freeing them to grow. HQ in New York and an AI‑Co‑Founder support global e‑commerce across
Flowglad
Flowglad is a New York–based payments layer for apps programmable in natural language, marketed as the easiest way to make internet money. Founded in 2025, it operates with a five-person team; co-founder Ahmed and Harrison Telyan (NUMI.tech
Rutter
Rutter offers a unified API infrastructure enabling B2B fintechs to build embedded financial products by connecting to customers’ systems of record. Backed by a16z, it is a trusted partner for Mercury, Airwallex, Payoneer, Ramp, across acco
