API startups in San Francisco Bay Area

Gigs

San Francisco

Gigs is building the operating system for mobile services, enabling tech companies to embed connectivity and automate phone-plan provisioning for fintechs and HRIS platforms. Backed by nearly $100 million from Ribbit Capital, Google, and Y

MERGE

San Francisco

Merge is a leading provider of customer-facing integrations and agent tools for frontier LLMs, serving thousands of customers including Fortune 500s and B2B SaaS firms, with offices in San Francisco, New York, and Berlin.

Recall.ai

San Francisco

Recall.ai provides infrastructure for processing meeting data and metadata, enabling enterprises to analyze and derive insights from meetings. Founded in 2020 and headquartered in San Francisco, it serves over 1,000 customers.

Stainless

San Francisco

✱ Stainless provides robust & polished SDKs for your REST API.They're idiomatic, type-safe, and engineered to feel like handwritten code.API-first companies like OpenAI, Anthropic, Meta, Cloudflare, and Scale use Stainless to generate SDKs

Column Tax

San Francisco

Column Tax democratizes access to financial help by delivering game-changing tax solutions for everyday people, highlighting gaps in financial guidance and the need for affordable tax support (over 100 million Americans can’t cover a $1,000

PlayAI

Mountain View

**Introduction** At [PlayHT](https://play.ht/), our vision is to redefine human interactions with AI agents. Whether it’s for customer support or sales calls, AI tutors, or bringing Gaming NPCs to life, our goal is to revolutionize the way

Agave

San Francisco

Agave is an early-stage company modernizing the construction industry. With a 10-year founding team from Graphiq/Amazon, it has raised $3M from YC, Accel, and industry leaders, serves 200+ paying customers, is cash-flow positive, and target

Pier

San Francisco

Pier is a fintech compliance platform for license management and regulatory reporting, enabling the next generation of financial services providers and expanding financial access for Americans. It has an oversubscribed round from top-tier v