API Reference
A REST API over JSON. All requests require a Bearer API key and return JSON.
Base URL
Email sending has a dedicated, versioned alias for third-party integrations. Everything else is under /api.
| https://cmdsend.com/v1 | Emails — public, versioned |
| https://cmdsend.com/api | Emails, Domains, API Keys |
Authentication
Every request needs an API key in the Authorization header:
Authorization: Bearer cmd_your_api_keySee the full guide in Authentication.
Request format
Send a JSON body with Content-Type: application/json on POST/PATCH requests. Response bodies are always JSON.
Errors
Non-2xx responses share a consistent shape — see the Errors reference.