Developer docs

SuperSend TX API

Transactional email API — send via REST, Node SDK, or CLI. Verify domains, manage webhooks, and deliver from infrastructure you control.

Quickstart

Account → API key → domain DNS → first send in about five minutes.

Bearer stx_ keys on every request to api.supersendtx.com.

POST /emails with from, to, subject, and html or text.

Machine-readable contract for generators and AI agents.

Production API: https://api.supersendtx.com