The same email platform your agent drives over MCP is available by API and a CLI.
Every plan, including the Free plan, has full API and CLI access. No upgrade gate, no add-on.
MCP, REST API and CLI are the same platform behind three doors. There's no "developer tier" paywall. Your API key and the nitrosend CLI work the moment you sign up, on every plan. Plan limits apply to send volume, seats and AI actions, not to the API or CLI themselves.
Build first. Upgrade when you scale.
Pick the surface that matches where your work lives. Both call the same engine your AI agent uses: the same contacts, the same templates, the same deliverability.
Bearer auth, JSON in, JSON out. Works with any language or HTTP client (Python, Node, Ruby, Go) and any automation platform like Zapier, n8n or Make.
curl https://api.nitrosend.com/v1/my/messages \
-H "Authorization: Bearer $NITROSEND_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"channel": "email",
"to": "[email protected]",
"subject": "Welcome aboard",
"body": "<h1>Welcome!</h1>"
}'
The nitrosend MCP, callable from a shell. Stable exit codes, --json output, --dry-run, and typed confirmation for production. Built for CI pipelines and agent runners.
$ npm install -g @nitrosend/cli $ nitrosend login $ nitrosend # dashboard: state + next actions $ nitrosend mcp tools call nitro_send_message \ --args '{"channel":"email","to":"[email protected]","subject":"Hi","body":"Welcome"}'
Most email APIs stop at "send a message." nitrosend gives you the entire stack through the same key: lists, automation, segmentation, brand and deliverability.
Send receipts, magic links and alerts with POST /v1/my/messages. Sub-second, branded, tracked.
Create, schedule and send marketing campaigns to lists and segments. Drafts, tests, then live.
Build multi-step automations (welcome series, onboarding, win-back) with triggers, delays and splits.
Create, search and bulk-import contacts. Tags, subscriptions and custom attributes.
Define rule-based segments by attribute or engagement that update themselves automatically.
Version on-brand templates. Your colours, fonts and logo applied to every email.
Add and verify sending domains. DKIM, SPF and DMARC handled for you.
Pull opens, clicks, bounces, complaints and reputation. Wire deliverability into your own dashboards.
MCP, CLI and API share the same tools and envelope. Prototype in chat, automate in the shell, ship in code. Same account, same data.
API keys and the CLI are live from signup on every plan, free included. Limits apply to volume and seats, never to access.
A complete, always-current spec at api.nitrosend.com/openapi.yaml. Drop it into Postman, an SDK generator, or your agent's tool schema.
Idempotency keys stop duplicate sends. --dry-run and --explain resolve a plan without side effects. Typed confirmation guards production.
Send on nitrosend's infrastructure, or connect your own SES, Mailgun or Postmark. Your domains, your reputation, your control.
Responses carry next_action and blockers guidance, so an agent always knows what to do next without guessing.