66 indexable API Management companies headquartered in San Francisco, United States, ranked by total equity funding and recent funding momentum. Combined disclosed equity funding of $1.7B across 32 funded companies, including 5 unicorns.
| # | Company | Funding | Valuation | Stage | Latest round | Employees | Founded | Momentum |
|---|---|---|---|---|---|---|---|---|
| 1 |
Kong
Unicorn Cloud based API management and microservices connectivity platform |
$249.3M | $2B as of 2024 |
Series E | Series E Nov 2024 | 128 | 2009 | ↑ Active |
| 2 |
Wallarm
API security platform delivering complete protection against attacks and abuse |
$20.1M | — | Series C | Series C Jul 2025 | 6 | 2013 | ↑ Active |
| 3 |
Composio
Platform to integrate AI agents and large language models with their technology stack |
$29M | — | Series A | Series A Mar 2025 | — | 2023 | ↑ Active |
| 4 |
Traceable Security
Cloud based API security solution |
$110.2M | — | Series B | Series B May 2024 | 98 | 2018 | — |
| 5 |
Platformatic
API development software for developers |
$7.8M | — | Seed | Seed Sep 2024 | 9 | 2022 | ↑ Active |
| 6 |
Subtrace
Cloud based API monitoring platform |
$500K | — | Seed | Seed 2025 | — | 2024 | ↑ Active |
| 7 |
Postman
Unicorn Provider of platform unifying API design, testing, documentation, monitoring, and discovery |
$434M | $5.6B as of 2021 |
Series D | Series D Aug 2021 | 279 | 2014 | — |
| 8 |
Hasura
Unicorn Developer of data access and AI integration software for businesses |
$239.4M | $1B as of 2022 |
Series C | Series C Feb 2022 | 69 | 2013 | — |
| 9 |
Apollo GraphQL
Unicorn API transformation and validation tool |
$152.1M | — | Series D | Series D Aug 2021 | 248 | 2011 | — |
| 10 |
MuleSoft
Unicorn Cloud based API management platform |
$259.3M | — | Series G | Series G 2016 | 663 | 2006 | — |
| 11 |
Speakeasy
Platform offering API management solution |
$14.9M | — | Seed | Seed May 2023 | 28 | 2022 | — |
| 12 |
Transposit
Cloud-based API management platform |
$50.4M | — | Series B | Series B Sep 2020 | 32 | 2016 | — |
| 13 |
Pipedream
Cloud based API integration platform |
$20M | — | Acquired | Series A May 2022 | 8 | 2018 | — |
| 14 |
Unkey
Platform providing API key management solutions |
$1.5M | — | Seed | Seed Nov 2023 | — | 2023 | — |
| 15 |
Moesif
Provider of API testing and monitoring tools |
$15.5M | — | Acquired | Series A Aug 2021 | 17 | 2016 | — |
| 16 |
KushoAI
Provider of an AI-powered platform for software reliability and security |
$600K | — | Seed | Seed Feb 2024 | — | 2022 | — |
| 17 |
Akto
Platform offering API security solution |
$4.5M | — | Seed | Seed Nov 2022 | 10 | 2022 | — |
| 18 |
Mashape
Unified API platform for managing, securing, and governing APIs and microservices |
$28.3M | — | Acquired | Series B Mar 2017 | 211 | 2010 | — |
| 19 |
HyperTest
Platform offering API testing software |
$2.1M | $3.3M as of 2019 |
Seed | Seed Dec 2022 | 13 | 2015 | — |
| 20 |
Mashery
API management portal |
$28.5M | — | Acqui-Hired | Series E Jul 2012 | 97 | 2006 | — |
| 21 |
Monster API
Platform offering API integration solutions |
$1.1M | — | Seed | Seed Jun 2023 | 3 | 2023 | — |
| 22 |
ReadMe
Documentation and digital transaction management software |
$9M | — | Series A | Series A Aug 2019 | 66 | 2015 | — |
| 23 |
Apiary
API design, development, documentation platform for developers, fostering collaboration and innovation |
$8.4M | — | Acquired | Series A Aug 2015 | 30 | 2011 | — |
| 24 |
Apible
API testing solutions provider |
$3.5M | — | Series A | Series A Nov 2020 | — | 2020 | — |
| 25 |
Runscope
API monitoring platform ensuring uptime, performance, and data validation |
$7.1M | — | Acquired | Series A Apr 2014 | 50 | 2013 | — |
| 26 |
Keploy
Developer of open-source platform for API, integration, and unit testing |
$1.3M | — | Seed | Seed Mar 2022 | 10 | 2022 | — |
| 27 |
3scale
Cloud-based solutions for API management |
$5M | — | Acquired | Series A Apr 2013 | 7,995 | 2007 | — |
| 28 |
Singly
App integration with third party service |
$2M | — | Acquired | Seed Jan 2011 | — | 2010 | — |
| 29 |
LunchBadger
Serverless microservices platform |
$1.6M | — | Deadpooled | Seed Jan 2017 | — | 2016 | — |
| 30 |
Metlo
Provider of API Security tool |
$125K | — | Seed | Seed Sep 2021 | 4 | 2021 | — |
| 31 |
Optic
API documentation solution provider |
$150K | — | Seed | Seed Aug 2018 | 9 | 2018 | — |
| 32 |
OneGraph
API integration solution |
$150K | — | Acquired | Seed 2018 | 3 | 2006 | — |
| 33 |
Stamplay
Unified platform for building custom apps and automating workflows |
— | — | Acqui-Hired | Seed Jul 2015 | 11 | 2012 | — |
| 34 |
Abstract API
Provider of suite of APIs |
— | — | Unfunded | — | — | 2020 | — |
| 35 |
AllianceAPI
API security solutions for IoT |
— | — | Unfunded | — | 11 | 2019 | — |
| 36 |
API Transformer
API transformation and developer experience platform for seamless API integration |
— | — | Unfunded | — | — | 2015 | — |
| 37 |
API.market
Blockchain-enabled APIs marketplace |
— | — | Unfunded | — | — | 2017 | — |
| 38 |
APIs
Indexing API descriptions to help developers discover and use APIs |
— | — | Deadpooled | — | — | 2013 | — |
| 39 |
Apisec
Cloud-based API security management solutions provider |
— | — | Unfunded | — | 50 | 2018 | — |
| 40 |
Bearer
The #1 platform to take control of your API usage. |
— | — | — | — | 30 | 2018 | — |
| 41 |
Blue Titan
API Management software for service oriented architecture |
— | — | Acquired | — | 12 | 2001 | — |
| 42 |
Bricks Cloud
Provider of an API gateway for managing large language model deployments |
— | — | Unfunded | — | — | 2022 | — |
| 43 |
BuildShip
Developer of a visual builder for AI workflows and backend APIs |
— | — | Unfunded | — | — | 2023 | — |
| 44 |
Carbon
Framework for building microservice and API |
— | — | Unfunded | — | — | 2010 | — |
| 45 |
DevRaven
Cloud based platform offering application performance monitoring solutions |
— | — | Unfunded | — | — | 2022 | — |
| 46 |
Elastic Beam
AI-powered API security, customer and workforce identity solutions |
— | — | Acqui-Hired | — | 30 | 2014 | — |
| 47 |
Hoist
Tool to integrate web apps by triggering code on events |
— | — | Deadpooled | — | 4 | 2013 | — |
| 48 |
HTTPie
Command-line HTTP client for API debugging |
— | — | Unfunded | — | 4 | 2020 | — |
| 49 |
Levo
The most comprehensive API Security Platform built for developers, by developers |
— | — | Funding Raised | — | 21 | 2021 | — |
| 50 |
LiquidMetal AI
Provider of AI-powered intelligent storage and search solutions |
— | — | Funding Raised | — | — | 2024 | — |
Cloud based API management and microservices connectivity platform. It operates through RESTful API and is built on NGINX. It inspects and monitors APIs and microservice traffic. It provides ready to deploy plugins and adds functionality to APIs and applications. It also offers the flexibility to run on the cloud of the users choice such as AWS, Azure, Google Cloud. It has clients such as Cisco, GSK, Paypal, etc.
API security platform delivering complete protection against attacks and abuse. It is a B2B SaaS company that provides a comprehensive solution for application and API security. The platform offers advanced API security, including API discovery, security testing, and abuse prevention. It helps organizations discover all APIs, detect and stop attacks, respond to incidents, and test APIs for security issues. It caters
Platform to integrate AI agents and large language models with their technology stack. The platform enables developers to integrate AI capabilities into their applications, streamlining the development process. It supports unlimited integrations, suitable for individual developers, startups, and large enterprises. It emphasizes data protection through security measures such as encryption and secure access protocols.
Cloud based API security solution. The platform uses distributed tracing, cloud-native integrations, and behavioral analytics to deliver application and API security. It enables users to discover, monitor, visualize, and correlate application code changes to transactions, API endpoints, and specifications. The platform allows users to track and discover changes to the API in real time.
API development software for developers. It offers a DB tool that enables developers to develop both open API and Grapghql schema APIs. It allows users to access open API composition, analyze services, and manage code updates. The platform supports databases such as SQLite, MySQL, MariaDB, and more.
Cloud based API monitoring platform. It is an API observability tool that connects backend to Chrome devtools to inspect the latency of each API request. It allows developers to track API requests and resolve production issues in real time.
Provider of platform unifying API design, testing, documentation, monitoring, and discovery. The platform integrates with gateways and Git solutions. It allows defining application programming interfaces collaboratively with support for standards. The platform helps to organize application programming interface requests, collaborate across teams, and automate workflows. It also helps to automate functional, integrati
Developer of data access and AI integration software for businesses. It provides tools for accessing and utilizing data, along with AI integration capabilities. The company offers solutions designed to enable businesses to leverage their data for AI applications. Its products facilitate data accessibility and aim to improve AI implementation processes.
Apollo is an API transformation and validation tool. Offers technologies such as Apollo clients, Apollo engine, and Apollo server. Apollo Clients connects data to UI. Apollo Engine helps in infrastructure and tooling and provides features such as caching, performance tracking, and error tracking. Apollo Server translates existing REST APIs and backends into GraphQL. Apollo Server feature includes schema stitching, Gr
Cloud based API management platform. It provides an integration solution for connecting application, data source, or API, in the cloud or on premise. The platform enables users to build, and test APIs in real time. It allows users to manage, monitor, and secure the APIs.
Platform offering API management solution. It enables users to assign internal and customer-facing embeds for request logs, customer usage, key rotation, etc. It provides embeddable UI components that enable self-service support for API. Its features include usage tracking, request replay, request viewing, etc.
Cloud-based API management platform. It provides a platform for building production-ready applications on top of APIs. It helps to compose disparate APIs by making use of the concept of relational databases. The platform abstracts away the details of specific API mechanics by allowing the user to express intent in a higher-level language of joins and filters, then translating that intent into a number of optimized AP
Y Combinator
Andreessen Horowitz
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CRV
Lightspeed Venture Partners
Lombardstreet Ventures
New Enterprise Associates
Western Technology Investment
Accel
Cisco Investments
Firestreak Ventures
IVP
Ignition Partners
Rankings are computed by Radar (Fliar BI) from the Radar company master and are updated periodically. Funding and momentum scores use disclosed equity-funding data only. Figures may lag private rounds. Last updated 2026-06-24.
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