Top 18 API Marketplaces SaaS Companies in May 2026

United States

RapidAPI is an API marketplace that enables developers to find and connect to APIs.

Los Altos, California, United States

Developer of a software platform designed to bring the power of cloud computing to engineering applications. The company's software platform offers an online community and marketplace enabling engineers, scientists and their service providers to discover, try and buy ubiquitous computing services on demand, in any private, public or hybrid cloud and get a performance boost of 10x or more when running their complex mathematical models and simulations.

United States

Real-time B2B data via simple APIs

Walnut, California, United States

Provider of a SaaS based integration platform intended to provide application creators their own integrations marketplace with pre-boarded partners. The company's platform uses a Slack application directory and keeps track of a consistent user experience, enabling developers to develop and design friction free applications easily.

United States

Discover, Connect And Manage APIs. We Are User-Friendly Public Hub Where API Providers Can Publish APIs For Developers And Partners To Consume. Allows software developers to build the next big thing much easier and faster.

Palo Alto, California, United States

FedML is a privately-held developer of an open-source community and an enterprise platform for decentralized and collaborative AI, and a web 3 AI marketplace. It provides an open-source MLOps platform for research, enabling developers and enterprises to build, deploy, and monetize their large language models easily and economically.

Mysuru, Karnataka, India

Yappes - Simplifies APIs. Yappes is the next-generation unified API platform to manage the end-to-end lifecycle of APIs and is critical for the API ecosystem of digital enterprises or those embarking on digital transformation using API first strategy. It enables the systematic management of the entire API lifecycle from design/build/create to deprecation/versioning/retiring of APIs. It is robust, reliable, secure, and scalable. Yappes is built with industry standard, controls, and governance and enables enterprises to benefit from efficiencies in dev ops, revenue outreach through the distribution of APIs, innovation and collaboration through partners, and customer-centricity through ease of use and customized products, which are some of the pressing issues in most of the sectors. A no-code/low code platform designed with the developers and management in mind. It comes ready with a Developer Engine, Internal/External Marketplace for APIs, API Gateway, Management Analytics of APIs, Monitoring of APIs and provides the best security and easy to use dashboard and console to view and manage the API ecosystem. Yappes helps Enterprises to deploy their API strategy in an integrated manner facilitating faster go-to-market and increased visibility of the APIs across organizations. Yappes has been successfully validated by several large enterprises within the banking, fintech, logistics, and travel sectors. Yappes is your go-to comprehensive platform simplifying API led digital transformation

United States

We enable financial innovators to access the best account aggregation and transaction enrichment providers through one lightweight integration and one simple contract. Our mission is to unlock the next wave of fintech innovation by removing technical and commercial barriers to build with financial data. Quiltt is backed by investors including Greycroft, Newark Venture Partners, Motivate Ventures and Abstraction Capital.

Antwerp, Oost-vlaanderen, Belgium

Belgian platform for managing and automating API workflows.

Tallinn, Harju maakond, Estonia

Connect with the blockchain in less than a second! We're NOWNodes - the biggest Web3 tool in the industry that provides access to 90+ blockchain networks for RPC, block explorer and websocket requests. One API key - the whole metaverse 🔑 Support - http://t.me/nownodes 📮