Developer docs
Groundmail API
Transactional email API — send via REST, the CLI, or an SDK for Node, Python, PHP, Ruby, or Go. Verify domains, manage webhooks, and deliver from infrastructure you control.
Quickstart
Account → API key → domain DNS → first send in about five minutes.
Authentication
Bearer gm_ keys on every request to api.groundmail.dev.
Emails
POST /emails with from, to, subject, and html or text.
OpenAPI
Machine-readable contract for generators and AI agents.
For AI agents
llms.txt, MCP server, and integration playbook for Cursor and Claude.
AI app builders
Copy-paste prompts for Lovable, Replit, Bolt, Base44, and v0.
Production API: https://api.groundmail.dev
Dashboard: https://app.groundmail.dev