Email that lands. Every time.

The developer-first email API for transactional and marketing messages. Send with an API key, verify domains with DNS, and track delivery end to end.

Everything you need to land in the inbox

Welcome

New to Notideus? Start here: what the API is, how authentication works, how to verify a domain, and how to send your first email in five minutes.

Tutorials

Step-by-step walkthroughs in Node.js and Python, plus deep dives on batches, idempotent retries, contact sync, and WhatsApp messages.

API reference

Every public endpoint, field by field: emails, WhatsApp, contacts, error codes, and quotas — with real request and response examples.

Resources

How delivery actually works: email statuses and transitions, contact states, and open/click tracking and events.