Moltin
Acquired
What they do:
eCommerce building blocks through simple APIs for websites & apps.…
Quick facts:
HQ: Boston, MA, United States
Top API Startups
This list has 147 startups and was last updated on Oct 15, 2026. 41 of them are hiring right now. Biggest hubs: San Francisco (73), New York (14), and Los Angeles (6). Largest teams: Checkr, Bird, and Verto.
147 startupsPage 4 of 5
Alterya
Acquired
What they do:
Protecting Humans from Scams
Quick facts:
Fern
Acquired
What they do:
Instantly offer SDKs and API Docs
Quick facts:
HQ: New York, NY, United States
Requestly
Acquired
What they do:
Open-Source Postman alternative
Quick facts:
HQ: San Francisco, CA, United States
Versori
Acquired
What they do:
Agentic integrations & automations for enterprise
Quick facts:
HQ: Manchester, United Kingdom
Zencoder
Acquired
What they do:
Video Encoding API, Open source video player (video.js)
Quick facts:
HQ: San Francisco, CA, United States
Rickshaw
Acquired
What they do:
Same day local delivery, via API. Currently operating in SF.
Quick facts:
HQ: San Francisco, CA, United States
Weav
Acquired
What they do:
Weav is the universal API for commerce platforms
Quick facts:
HQ: New York, NY, United States
Sohar Health
Acquired
What they do:
AI-powered insurance verification to boost patient conversion.
Quick facts:
HQ: New York, NY, United States
Trieve
Acquired
What they do:
All-in-one API for search, RAG, & recommendations
Quick facts:
HQ: San Francisco, CA, United States
EzDubs
Acquired
What they do:
Real-time speech translation
Quick facts:
HQ: San Francisco, CA, United States
Vizzly
Acquired
What they do:
Customer-Facing Analytics for Modern SaaS.
Quick facts:
HQ: London, United Kingdom
Trigo
Acquired
What they do:
Rent verification API for landlords and lenders
Quick facts:
HQ: New York, NY, United States
Glide
Acquired
What they do:
Crypto Deposits, Wallet Funding, and Pay-with-crypto Infra
Quick facts:
HQ: New York, NY, United States
Warrant
Acquired
What they do:
Authorization and access control as a service.
Quick facts:
HQ: Los Angeles, CA, United States
Payload
Acquired
What they do:
Developer-First Headless CMS and Application Framework
Quick facts:
HQ: Grand Rapids, MI, United States
SlidePay
Acquired
What they do:
Banking and Payment Platform APIs. Exited October 2014.
Quick facts:
HQ: San Francisco, CA, United States
Scaphold.io
Acquired
What they do:
The Universal API
Quick facts:
HQ: San Francisco, CA, United States
OneGraph
Acquired
What they do:
GraphQL API to connect all of the internet's APIs. Join us at Netlify!
Quick facts:
HQ: San Francisco, CA, United States
Standard Treasury
Acquired
What they do:
Banking APIs; acquired by Silicon Valley Bank in August 2015
Quick facts:
HQ: San Francisco, CA, United States
YC S13Early stage
Wingback
Shut down
What they do:
Wingback provides tools and APIs for SaaS pricing and packaging.
Quick facts:
HQ: San Francisco, CA, United States
Integration Labs
Shut down
What they do:
The Unified API for Business Financial Data
Quick facts:
UtilityScore (formerly Pando)
Shut down
What they do:
API that estimates utility costs for 100M+ homes.
Quick facts:
HQ: San Francisco, CA, United States
Xkit
Shut down
What they do:
Universal CRM integration for B2B SaaS apps
Quick facts:
HQ: San Francisco, CA, United States
Pelm
Shut down
What they do:
Plaid for utilities
Quick facts:
HQ: San Francisco, CA, United States
Vessel
Shut down
What they do:
Developer-first, native integration platform for GTM tools
Quick facts:
HQ: San Francisco, CA, United States
Bridgecard
Shut down
What they do:
Card issuer for Africa
Quick facts:
Tesseral
Shut down
What they do:
The open source platform for managing identity in business software
Quick facts:
HQ: San Francisco, CA, United States
Smobi
Shut down
What they do:
Send texts your customers actually want over RCS
Quick facts:
HQ: New York, NY, United States
Valari
Shut down
What they do:
Embedded finance platform for LatAm.
Quick facts:
HQ: Mexico City, Mexico
Fileforge
Shut down
What they do:
API For PDF Document Workflows
Quick facts:
HQ: San Francisco, CA, United States
Flotype
Shut down
What they do:
Third generation of web apps.
Quick facts:
HQ: San Francisco, CA, United States
Framebase
Shut down
What they do:
API for video.
Quick facts:
HQ: San Francisco, CA, United States
Scanate/Fellow
Shut down
What they do:
API for Invoice Financing
Quick facts:
HQ: San Francisco, CA, United States
Basilica
Shut down
What they do:
Basilica is an API that embeds high-dimensional data like images and…
Quick facts:
HQ: San Francisco, CA, United States
Sendo
Shut down
What they do:
The best SMS/RCS API for startups
Quick facts:
HQ: New York, NY, United States