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API Overview

Reference for Signal API V2 endpoint groups.

What is API V2?

API V2 is the public HTTP interface used by Signal clients and external integrations. It groups the available routes into focused areas for projects, jobs, posts, and tagging.

Scope

This documentation covers V2 endpoints only (/v2/...).

Authentication

Most endpoints require API key authentication. See Authentication.

API areas

Doc rev.1.12.3 2026.05.08