Postman

Postman is an API platform used to build, test, mock, document and monitor APIs. Requests are organised in collections that can be run manually or automated, and the Postman CLI runs them from the command line and in continuous integration pipelines.

The platform is now positioned around “API engineering for your agents”. The Postman CLI ships agent skills for API testing, API mocking, API monitoring, CI integration and performance testing, and a Claude Code plugin is available. Context Graph gives API context to AI agents, Passport acts as a credential proxy, and further features route, govern and observe AI traffic and generate API documentation and SDKs.

Postman is a proprietary product with a free plan and paid plans.