Best API Management Companies in United States
The 274 best API Management companies in United States in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: Postman.
Ranked by disclosed equity funding and recent momentum, this directory maps 274 API Management companies across the United States, where $4.1B in total disclosed capital and eight unicorns signal a market that's moved well past early-stage experimentation. The global API management market sits around $4.5B today and is forecast to reach $13.7B by 2027 at a 28.77% CAGR, driven by enterprises needing tighter control over how their systems expose and consume data. Kong leads our funding table at $249M. Gravitee has pulled $42M, StackHawk $35M. So the question isn't whether this sector is real money. It's which companies are building durable infrastructure versus riding the wave.
Data security and privacy concerns are reshaping what buyers actually demand from API layers, and I'd note that pressure is pushing vendors toward more granular access controls fast. As shown in 2017 research, API governance frameworks have long been a structural challenge, not just a tooling one. You'll find the most active institutional backers here include Y Combinator, Andreessen Horowitz, and New Enterprise Associates, which tells you something about where the conviction sits. Bright Security, Corsha, and Wallarm round out the funded names worth tracking, each carving into the security layer that's become non-negotiable for enterprise API programs.
Ranked: Best API Management companies in United States
| # | Company | Disclosed funding | Last round | Stage | Employees | Founded | Market signals (1y) | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Postman 🦄 Provider of platform unifying API design, testing, documentation, monitoring, and discovery | $434M | 58 mo ago | Series D | 279 | 2014 | 3 signals IPO · Hiring · M&A | — | 2 launchs |
| 2 | FireEye Provider of API listing platform | $400M | 66 mo ago | Public | 1,815 | 2019 | — | 440 patents Advanced malware detection, threat analytics, and automated network security response systems. | — |
| 3 | Salt Security 🦄 AI based API security software | $281M | 44 mo ago | Series D | 39 | 2016 | — | — | — |
| 4 | MuleSoft 🦄 Cloud based API management platform | $259M | 120 mo ago | Series G | 663 663 → 1,120 (+69%) | 2006 | — | 30 patents Automated API integration, data mapping, and schema transformation for enterprise software connectivity. | 3 launchs |
| 5 | Kong 🦄 Cloud based API management and microservices connectivity platform 84Tech top 18%Patents top 20%Funding top 21%Moat top 22% All 11 signals ▾Techtop 18% Patentstop 20% Fundingtop 21% Moattop 22% Innovationtop 30% Markettop 33% Globaltop 37% Growthtop 38% Talenttop 38% Producttop 41% Newsbottom 21% Tech: 76 technologies across 6/8 capability areas · Cloud: Amazon Cloudfront, Amazon S3 Patents: 188 patents matched (strict assignee match) · 44 filings since 2022 vs 44 in 2017-21 rank vs industry peers · Fliar Intelligence Index 84/100 | $249M | 18 mo ago | Series E | 128 | 2009 | — | 188 patents AI-driven API gateway and microservices orchestration for intelligent query routing and documentation | — |
| 6 | Hasura 🦄 Developer of data access and AI integration software for businesses | $239M | 51 mo ago | Series C | 69 | 2013 | — | — | — |
| 7 | Noname Security 🦄 API security platform for busniesses | $220M | 54 mo ago | Acquired | 471 | 2020 | — | — | — |
| 8 | Apigee API management and analytics software for enterprises and developers | $198M | 144 mo ago | Acquired | 404 | 2004 | — | 10 patents API traffic management, caching, monitoring, anomaly detection, and data synchronization | — |
| 9 | Solo.io 🦄 Connects applications with APIs and service mesh across any infrastructures | $175M | 56 mo ago | Series C | 33 | 2017 | — | — | 1 award |
| 10 | Instart Cloud-based web application and API security solution | $170M | 103 mo ago | Series D | 122 | 2010 | — | 2 patents Accelerating application performance via partial file caching in network data transfer. | — |
| 11 | Apollo GraphQL 🦄 API transformation and validation tool | $152M | 58 mo ago | Series D | 248 | 2011 | — | — | — |
| 12 | WSO2 Provider of open-source platform for API management, integration, and identity | $130M | 48 mo ago | Acquired | 10 | 2005 | 8 signals ▼60% Leadership · Announcements | — | — |
| 13 | Traceable Security Cloud based API security solution | $110M | 25 mo ago | Series B | 98 98 → 62 (-37%) | 2018 | — | — | — |
| 14 | Cequence Cloud based platform offering API security solutions | $100M | 38 mo ago | Series C | 170 | 2014 | — | — | 1 launch |
| 15 | Macrometa Cloud based data mesh and edge-integrated platforms for application development | $68M | 43 mo ago | Series B | 90 | 2017 | — | 8 patents Optimizing document database garbage collection and ontology-driven backend code generation. | — |
| 16 | Edgio Cloud based API security solutions | $66M | 31 mo ago | Deadpooled | 980 | 2001 | — | 16 patents Edge computing platform optimizing CDN routing, caching, and adaptive network security. | — |
| 17 | Cloud Elements API integration platform | $60M | 82 mo ago | Acquired | 57 | 2012 | — | — | — |
| 18 | Transposit Cloud-based API management platform | $50M | 69 mo ago | Series B | 32 | 2016 | — | 11 patents Enables low-code workflow automation and integration via actionable markdown and component relation engine | — |
| 19 | OpenLegacy AI-driven platform modernizing legacy systems with seamless cloud migration and API generation | $50M | 76 mo ago | Series B | 79 | 2014 | — | — | 1 launch |
| 20 | Jitterbit Platform offering API management software | $45M | 67 mo ago | Series C | 172 | 2004 | 7 signals ▲250% New product · Leadership | 8 patents Enterprise integration middleware for API orchestration, data transformation, and query abstraction. | 1 award |
| 21 | Gravitee Open source based API management platform | $42M | 12 mo ago | Series C | 87 | 2015 | — | — | — |
| 22 | Mayhem Automated code and API security testing tool | $38M | 25 mo ago | Acquired | 49 | 2012 | — | — | — |
| 23 | StackHawk Cloud based security testing software | $35M | 12 mo ago | Series B | 50 | 2019 | — | — | 1 partnership |
| 24 | Composio Platform to integrate AI agents and large language models with their technology stack | $29M | 14 mo ago | Series A | — | 2023 | — | — | — |
| 25 | Speakeasy Online platform providing multi-disciplinary learning solutions | $26M | 19 mo ago | Series A | 1 | 2022 | — | 7 patents Patents concentrated in computing, sensing & instrumentation | — |
| 26 | Bright Security Platform offering security testing software | $25M | 12 mo ago | Series A | 135 | 2018 | — | — | — |
| 27 | Stainless Provider of tools generating software development kits from API specifications | $25M | 18 mo ago | Acquired | — | 2022 | — | — | — |
| 28 | StopLight Cloud based API designing platform | $22M | 64 mo ago | Acquired | 65 | 2014 | — | 12 patents Enterprise application interface data integration and governance platform | — |
| 29 | Paragon Platform offering API integration solution | $21M | 20 mo ago | Series A | 44 | 2019 | — | 856 patents Patient-specific orthopedic surgical guides and fixation implants for bone repair and joint replacement | 1 launch |
| 30 | Neosec Platform offering cloud based application programming interface security provider | $21M | 57 mo ago | Acqui-Hired | 47 | 2002 | — | — | — |
| 31 | Wallarm API security platform delivering complete protection against attacks and abuse | $20M | 10 mo ago | Series C | 6 | 2013 | 5 signals ▲400% Leadership · Funding | 10 patents AI-driven API security and L7 threat detection for firewalls and IDS | — |
| 32 | Pipedream Cloud based API integration platform | $20M | 49 mo ago | Acquired | 8 | 2018 | — | — | — |
| 33 | Corsha Platform offering API security software | $15M | 10 mo ago | Series A | 8 | 2017 | — | 4 patents Secure machine-to-machine key rotation and streaming authentication for network devices | — |
| 34 | Speakeasy Platform offering API management solution | $15M | 36 mo ago | Seed | 28 28 → 45 (+61%) | 2022 | — | 7 patents Personalized interactive display systems integrating environmental controls and social-driven product recommendations. | 1 job opening · 1 partnership |
| 35 | Fragment Developer of an API for building and managing financial ledgers | $11M | 22 mo ago | Seed | 13 | 2021 | — | — | — |
| 36 | Zuplo Cloud based API management software | $9M | 32 mo ago | Seed | 10 | 2021 | — | — | 1 partnership |
| 37 | Platformatic API development software for developers | $8M | 20 mo ago | Seed | 9 | 2022 | — | — | — |
| 38 | Grafbase Cloud-based API management solutions provider | $7M | 43 mo ago | Seed | 19 | 2020 | — | — | — |
| 39 | Refold AI Provider of AI agents for enterprise-grade software integrations and automation | $6M | 11 mo ago | Seed | — | 2023 | — | — | — |
| 40 | WireMock Cloud based API mocking software | $6M | 36 mo ago | Seed | 4 | 2016 | — | — | — |
| 41 | Qpoint Platform offering API management solutions | $6M | 11 mo ago | Series A | 4 | 2022 | — | — | — |
| 42 | Lunar.dev Cloud based API management and optimization platform | $6M | 31 mo ago | Seed | 10 | 2022 | — | — | 1 partnership |
| 43 | NightVision Platform offering security testing software | $5M | 14 mo ago | Series A | — | 2022 | — | — | — |
| 44 | PolyAPI Provider of AI-powered API and event discovery platform | $5M | 23 mo ago | Series A | — | 2023 | — | — | 1 launch |
| 45 | Inigo Provider of a service that will be discontinued in August 2025 | $4M | 39 mo ago | Seed | 12 | 2017 | — | 4 patents Patents concentrated in computing, sensing & instrumentation | — |
| 46 | WunderGraph Cloud based API management platform | $3M | 16 mo ago | Series A | 15 | 2020 | — | — | 1 job opening · 1 launch |
| 47 | fastn AI powered API generation platform | $3M | 21 mo ago | Seed | — | 2023 | — | — | — |
| 48 | Unkey Platform providing API key management solutions | $2M | 31 mo ago | Seed | — | 2023 | — | — | — |
| 49 | Dapta Low-code backend and integration platform that allows users to deploy and manage microservices | $1M | 13 mo ago | Series A | — | 2023 | — | — | — |
| 50 | Subtrace Cloud based API monitoring platform | $500K | 12 mo ago | Seed | — | 2024 | — | — | — |
Top 12 API Management companies in United States
#1
Kong 🦄Series E · San Francisco, California · founded 2009 · 128 employees$249.3Mraised▾
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.
- Nov 2024Series E—
- Aug 2024Series D$80M
- Dec 2020Series D$100M
- Dec 2018Series C$43M
#2
Series C · San Francisco, California · founded 2013 · 6 employees$20.1Mraised▾
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 to various industries, including technology, healthcare, fintech, and e-commerce, and supports multiple cloud platforms like AWS, GCP, and Azure. The platform provides real-time API threat protection, AI agent security, and API SOC services. It offers features such as credential stuffing detection, API leak management, and cloud-native WAAP. The company focuses on protecting APIs and AI agents from threats, providing visibility, automated response, and integrations.
- Jul 2025Series C$55M
- Sep 2023Series A$9.2M
- Oct 2018Series A$8M
- Dec 2016Series A$2.3M
#3
Series B · Denver, Colorado · founded 2019 · 50 employees$35.3Mraised▾
Cloud based security testing software. It allows users to test the APIs, applications, and services for security vulnerabilities. It runs the security testing in the CI or CD pipelines to identify vulnerabilities in the pipeline. The features include graphql testing, grpc testing, and more.
- May 2025Series B$12M
- Sep 2022Series B$29.6K
- May 2022Series B$20.7M
- Oct 2020Series A$10M
#4
Series A · Vienna, Virginia · founded 2017 · 8 employees$14.9Mraised▾
Platform offering API security software. It provides multi-factor authentication based security solution to protect online accounts and make stolen usernames and passwords unusable. Their patent-pending streaming authentication solution does not separate devices or applications. It eliminates API attacks that use stolen or compromised API credentials and thereby help enterprise to protect data and applications.
- Aug 2025Series A—
- Apr 2025Series A$18M
- Apr 2022Series A$12M
- Jul 2021Grant (prize money)—
#5
Series C · Denver, Colorado · founded 2015 · 87 employees$42Mraised▾
Open source based API management platform. It offers agentic AI that allows users to manage APIs. Its gateway handles each HTTP call and provides multiple analytics dashboards for API publishers and consumers. It enables users to consolidate APIs into a single developer portal, and monitor the traffic and activity in real time. Features include API design, observability, access management, agent mesh, and more.
- May 2025Series C$60M
- Sep 2022Series B$30M
- Jul 2021Series A$11M
#6
Series A · San Rafael, California · founded 2018 · 135 employees$25Mraised▾
Platform offering security testing software. The platform identifies any vulnerabilities in the application. It automatically tests every aspect of applications, APIs web sockets, or mobile. The platform leverages AI to understand the application architecture and generate sophisticated and targeted attacks.
- May 2025Series A$1M
- Mar 2022Series A$20M
- Oct 2020Seed$4.7M
#7
Series A · San Francisco, California · founded 2023$29Mraised▾
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.
- Mar 2025Series A$25M
- Jul 2023Seed$4M
#8
Series A · Fort Collins, Colorado · founded 2022 · 4 employees$6.1Mraised▾
Platform offering API management solutions. It provides a platform that helps businesses identify and examine application API endpoints. It offers detailed logs and DPI for actionable insights and streamlined troubleshooting, allowing teams to quickly resolve security and reliability issues.
- Jul 2025Series A$9.4M
- Oct 2024Seed$4M
- Dec 2023Seed$2.1M
#9
Seed · San Mateo, California · founded 2023$6.5Mraised▾
Provider of AI agents for enterprise-grade software integrations and automation. The agents handle custom logic, legacy systems, and unpredictable APIs. This allows teams to focus on product development. The platform offers memory graphs, real-time adaptation, and auto-fixing workflows. It supports workflow creation, data mapping, test case writing, and integration infrastructure. The agents can be deployed in managed cloud, self-hosted cloud, or customer environments.
- Jun 2025Seed$6.5M
#10
Acquired · New York City, New York · founded 2022$25Mraised▾
Provider of tools generating software development kits from API specifications. These kits offer features such as typed events, built-in verification, and flexible configuration. The kits are designed to feel like handwritten code. The company offers tools that generate command line interfaces from API specifications.
- Dec 2024Series A$25M
#11
Series A · Mountain View, California · founded 2022 · 1 employees$25.9Mraised▾
Online platform providing multi-disciplinary learning solutions
- Oct 2024Series A$15M
- Jun 2023Series A$7.6M
- 2022Series A$3.3M
#12
Series A · Los Angeles, California · founded 2019 · 44 employees$21Mraised▾
Platform offering API integration solution. It accelerates the integration process and provides a managed authentication for every integration. The platform enables developers to define integration logic using workflows. The features of the product include end-to-end visibility, debugging, scalability, zero maintenance, and low-code workflow building.
- Oct 2024Series A$5.5M
- Jul 2022Series A$13M
- Jul 2020Seed$2.5M
Funding & investor landscape
Notable founders
Market landscape — 10 sub-themes by coverage
Share of API Management coverage by sub-theme.
Regulatory-risk over time flat
Funding & growth over time
funding rising · growth rising
Common questions
Riya reads income statements for fun. She covers the real money in a sector — revenue, growth, who actually earns — and never met a vague claim she didn't want a number for.