Echolon
Test REST and WebSocket APIs with local collections, Git integration, and configurable mock servers.
Build, test, and collaborate on APIs

Postman gives teams a workspace for API requests, collections, specifications, and tests. Developers can build a request workflow, create a mock before an endpoint exists, and add scripted assertions to check responses. Monitors and performance tests extend those checks to deployed services and load behavior.
The CLI runs collections and validation in automated development workflows. Agent skills and an MCP connection make API context available to coding tools, while the Context Graph maps relationships among APIs and collections. A team can use that information to find an existing endpoint, understand dependencies, and review checks for a proposed change within the same shared API workspace.
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