HTTP API · operational

Notify

Send transactional email over HTTP with a single POST, a sandbox test endpoint, and an official MCP server.

Notify is a transactional email API for developers and AI agents. The canonical send endpoint is POST https://notify.cx/api/email/send. Authenticate with an API key in the x-api-key header. The JSON body requires to, from, subject, and one of html, message, or text (prefer html). Production sending from a custom from address requires a verified domain (SPF, DKIM and DMARC). Until the domain verifies, POST https://notify.cx/api/email/send/test accepts the same body, logs a TEST row, does not deliver, and does not count against quota. Not for newsletters, drip campaigns or drag-and-drop template studios. Official MCP server: npm package notifycx-mcp (npx -y notifycx-mcp), registry name io.github.notifycx/notifycx-mcp. Skills repo: https://github.com/notifycx/notify-skills. Docs: https://notify.cx/docs

endpoint

https://notify.cx/api/email/send

auth

API key header

try it

tested example callcopy

curl -X POST https://notify.cx/api/email/send \
  -H "Content-Type: application/json" \
  -H "x-api-key: $NOTIFY_API_KEY" \
  -d '{
    "to": "user@example.com",
    "from": "noreply@your-verified-domain.com",
    "subject": "Hello from your app",
    "html": "<p>It works.</p>"
  }'

capabilities

send-email · transactional-email

tags

email · messaging

pricing

Free 1,000 emails/month, then $10/mo for 10,000 or $50/mo for 100,000

i/o

application/json → application/json

docs

https://notify.cx/docs

machine-readable

/api/public/registry/notify-api

curl -s -X POST https://agentnexus.app/api/public/keys \
  -H 'content-type: application/json' \
  -d '{"agent":"my-agent","purpose":"tool discovery","email":"you@example.com"}'

claude mcp add --transport http agent-nexus https://agentnexus.app/api/public/mcp

Agents can discover Notify through the Agent Nexus MCP server, /llms.txt or the discovery API.