SendAPI Server

Official Model Context Protocol server for SendAPI.

Give any MCP-compatible AI agent (Claude Code, Claude Desktop, ChatGPT/Codex, Cursor, Windsurf, Cline) the ability to send WhatsApp messages, SMS, OTP codes, and email through one REST API.

Quick start

You need a SendAPI API key. Create one in your dashboard.

The server runs over stdio via npx, so there is nothing to install globally.

Claude Desktop / Claude Code

Add to your MCP config (claude_desktop_config.json, or .mcp.json in a project):

{
  "mcpServers": {
    "sendapi": {
      "command": "npx",
      "args": ["-y", "@sendapi/mcp-server"],
      "env": {
        "SENDAPI_API_KEY": "sk_live_xxxxxxxxxxxx"
      }
    }
  }
}

Cursor / Windsurf / Cline

Same shape: a stdio server with command: npx, args: ["-y", "@sendapi/mcp-server"], and SENDAPI_API_KEY in env.

Two ways to run it

Mode	Transport	Best for
Local (npx, above)	stdio	Coding agents on your machine (Claude Code, Cursor, Windsurf, Cline, Codex CLI).
Hosted (sendapi.co/mcp)	streamable HTTP	One-click connectors with no install (Claude/ChatGPT remote connectors, n8n MCP Client node).

Hosted (remote) server

No install. Point your client at the remote URL and authenticate with your API key:

• URL: https://sendapi.co/mcp
• Auth: Authorization: Bearer sk_live_xxxxxxxxxxxx (or the X-SendAPI-Key header)

The hosted server is multi-tenant and stateless: your key is used only for the lifetime of each request and never stored server-side. Self-host it yourself with the included Dockerfile (docker build -t sendapi-mcp . && docker run -p 8080:8080 sendapi-mcp), then connect to http://localhost:8080/mcp.

Configuration

Env var	Required	Default	Used by	Notes
SENDAPI_API_KEY	stdio only	—	stdio	Your SendAPI API key (Bearer token).
SENDAPI_BASE_URL	no	https://sendapi.co/v1	both	Override for self-hosted or staging.
PORT	no	8080	hosted	Port the HTTP server listens on.

Tools

Messaging

• send_whatsapp — send a WhatsApp message from a connected session
• send_bulk_whatsapp — send to many recipients (max 500)
• send_sms / send_bulk_sms
• send_email / send_bulk_email

Verification

• send_otp — send a one-time code (SMS, WhatsApp, or email)
• check_otp — verify a code
• validate_phone — validate / look up a number

Status & usage (read-only)

• get_email_status, get_sms_status, get_whatsapp_message
• get_usage — remaining quota across channels

Setup helpers (read-only)

• list_whatsapp_sessions, get_whatsapp_session_qr
• list_sender_ids, list_email_domains, list_email_templates

Auth, billing, API-key, and team-admin endpoints are intentionally not exposed to agents.

Safety

Every send still flows through SendAPI's normal limits and abuse protection. Bulk tools are annotated as high-impact so clients can prompt for confirmation. Errors surface SendAPI's code/message so the agent can self-correct (for example sending_limited or content_blocked).

Development

npm install
npm run build      # compile TypeScript to dist/
SENDAPI_API_KEY=sk_test_xxx npm start

License

MIT