# Nitrosend

> AI-native email marketing platform. Full-stack email controlled from AI tools via MCP.

Nitrosend is the email platform built for AI agents and developers. It handles transactional email, marketing campaigns, automations, and contact management — all operated via MCP (Model Context Protocol) from Claude, ChatGPT, Cursor, Codex, Gemini, VS Code, Windsurf, and other AI tools. No dashboard required.

## Quick Start

Connect via any MCP client using the server URL:

    https://api.nitrosend.com/mcp

Authentication is OAuth 2.1 — your AI tool opens a browser for sign-in, no API key needed.

### Claude Code

```
claude mcp add --transport http nitrosend https://api.nitrosend.com/mcp
```

### Claude Desktop / Claude.ai

Settings → Connectors → Add Custom Connector → paste `https://api.nitrosend.com/mcp`

### ChatGPT

Settings → Apps → Advanced settings → enable Developer mode, then Settings → Apps → Create app for a remote MCP server → paste `https://api.nitrosend.com/mcp`

### Cursor

Add to `.cursor/mcp.json`:
```json
{"mcpServers": {"nitrosend": {"url": "https://api.nitrosend.com/mcp"}}}
```

### VS Code (Copilot)

Add to `.vscode/mcp.json`:
```json
{"servers": {"nitrosend": {"type": "http", "url": "https://api.nitrosend.com/mcp"}}}
```

### Windsurf

Add to `~/.codeium/windsurf/mcp_config.json`:
```json
{"mcpServers": {"nitrosend": {"serverUrl": "https://api.nitrosend.com/mcp"}}}
```

### Codex CLI

```
codex mcp add nitrosend --url https://api.nitrosend.com/mcp
codex mcp login nitrosend
```

### Gemini CLI

Add to `~/.gemini/settings.json`:
```json
{"mcpServers": {"nitrosend": {"httpUrl": "https://api.nitrosend.com/mcp"}}}
```

### Zed

Add to Zed settings:
```json
{"context_servers": {"nitrosend": {"url": "https://api.nitrosend.com/mcp"}}}
```

Then prompt: "Set up a welcome email series for my SaaS app"

## Key Features

- **Full-stack email**: Transactional + marketing campaigns + automations in one platform
- **MCP-native**: 21 MCP tools, operates from any AI tool that supports MCP
- **AI-powered design**: Brand-matched email templates generated from prompts
- **AI copywriting**: Subject lines, body copy, A/B testing — all AI-generated
- **BYO keys**: Bring your own sending provider (SendGrid, Postmark, SES, Resend, Mailgun) and AI keys (OpenAI, Anthropic)
- **Unlimited contacts**: Pay for sends, not contacts. No per-contact pricing.
- **Auto authentication**: DKIM, SPF, DMARC configured automatically
- **Separated streams**: Transactional and marketing on separate infrastructure
- **Sub-200ms API responses**: Median response time under 200ms

## Pricing

- Free: $0/mo (8,000 emails to start, then 500/mo)
- Hobby: $20/mo (25,000 emails/mo)
- Pro: $100/mo (150,000 emails/mo)
- Scale: $300/mo (500,000 emails/mo)
- BYO: $60/mo (unlimited emails, your infrastructure + AI keys)
- Enterprise: Custom (SSO, dedicated infra, SLA)

All plans include unlimited contacts, all features, MCP + REST API access.

## Links

- Website: https://nitrosend.com
- Docs: https://docs.nitrosend.com
- API Reference: https://docs.nitrosend.com/api-reference
- GitHub: https://github.com/Nitrosend
- npm SDK: https://www.npmjs.com/package/@nitrosend/sdk
- npm MCP: https://www.npmjs.com/package/@nitrosend/mcp
- Full LLM docs: https://nitrosend.com/llms-full.txt

## Team

Built by George Hartley (ex-CEO Bluethumb, acquired), Kam Low (ex-CTO SmartrMail, 6B+ emails sent), and Ed Hartley (founded Sendicate, 28K users, acquired). This is their third email platform. Combined experience: 6B+ emails sent across two acquired ESPs.

## API Overview

- Base URL: https://api.nitrosend.com
- Auth: Bearer token (OAuth or API key)
- Rate limit: 100 requests/second (burst), 10,000/minute (sustained)
- Response format: JSON
- Errors: Standard HTTP status codes with JSON error bodies

Key endpoints:
- POST /v1/my/campaigns — Create campaign
- PATCH /v1/my/campaigns/{id} — Update campaign (subject, design, audience)
- POST /v1/my/campaigns/{id}/send — Send or schedule campaign
- GET /v1/my/contacts — List contacts (paginated)
- POST /v1/my/contacts — Create contact
- GET /v1/my/lists — List contact lists
- GET /v1/my/segments — List segments
- GET /v1/my/templates — List templates
- PATCH /v1/my/templates/{id} — Update template design
- POST /v1/my/templates/{id}/send_test — Send test email
- POST /v1/my/templates/preview — Preview email HTML
- GET /v1/my/account — Account info and usage

## MCP Tools (21 total)

The Nitrosend MCP server exposes 21 tools for AI agents:

Campaign management: create campaign, update campaign, send campaign, list campaigns, get campaign
Contact management: list contacts, search contacts, import contacts, manage audience
Template management: list templates, update template, preview template, send test
Configuration: configure account, manage domains, set brand
Analytics: get insights, get status, query data

## Supported AI Clients

Claude Code, Claude Desktop (Cowork), Claude.ai, ChatGPT (Developer mode), OpenAI Codex, Cursor, Gemini, Windsurf, VS Code Copilot, Zed

## Error Codes

- 400: Bad request (invalid parameters)
- 401: Unauthorized (invalid or missing bearer token)
- 403: Forbidden (insufficient permissions)
- 404: Not found (resource doesn't exist)
- 422: Unprocessable entity (validation failed)
- 429: Rate limited (too many requests)
- 500: Internal server error