Browse 3 startups in San Francisco working in API. Every listing below is matched on location and skill set so you can discover the right company faster. Compare profiles and reach out directly.
Superglue, a Winter 2025 Y Combinator company, is attacking one of the least glamorous and most fragile layers of the modern enterprise stack: the brittle SQL scripts, cron jobs, and one-off connectors that quietly run most day-to-day operations. Founded in 2024 by Adina Goerres and Stefan Faistenauer, the four-person team is building an open-source platform […]
San Francisco, CA — The first generation of AI coding assistants proved that language models could write code. The next generation is about something harder: agents that can work inside real codebases for long-running, multi-step engineering tasks without getting slow, expensive, or unreliable. Morph, a Y Combinator Summer 2023 company based in San Francisco, is […]
AgentMail, a Y Combinator-backed Summer 2025 startup, is building what Gmail built for humans — but for AI agents. The company’s email inbox API gives AI agents their own persistent inboxes, enabling them to send, receive, parse, and act on email with the same fluency a human professional would bring to the medium. In September […]
