Scheduler Zero
REST API

REST API

Programmatic access to campaigns, leads, inboxes, webhooks, and workspace data.

The Scheduler Zero REST API is available at:

https://api.schedulerzero.com/v1

Every request must include a workspace-scoped API key in the x-api-key header.

x-api-key: sz_your_api_key_here

Create and manage keys under Settings → API Keys. Missing or invalid credentials return 401; valid credentials without the required scope return 403.

Make your first request

Create a key and call the API with curl.

Browse the API reference

Explore every public operation and schema.

OpenAPI 3.1 specification

Download or import the machine-readable contract.

Troubleshooting MCP

Resolve common connection, authentication, permission, and workspace errors.

Quickstart

Create an API key and make your first Scheduler Zero REST request.