Ark
Ark is the AI first email API. Send transactional emails with native MCP support, sub-second delivery, and 99.9% deliverability.
About
Ark is the email API built for AI-first developers. Native MCP server with 26 tools lets Claude, Cursor, Windsurf, and Claude Code send emails through natural language — no wrapper code needed. AI-readable docs cut token usage by 10x. Integrates seamlessly with your stack: Supabase edge functions, n8n workflows, Vercel serverless, or any automation pipeline. SDKs for Python, Node.js, Ruby, and Go. Full SMTP relay for self-hosted tools like Listmonk, Coolify, and Metabase. 99.9% deliverability. Sub-second delivery. Automatic SPF, DKIM, and DMARC. Real-time webhooks for delivery, opens, clicks, and bounces. Simple pricing: $0.50 per 1,000 emails. No tiers, no enterprise sales calls. Start free with $5 in credits. Built for developers who ship with AI, automate with code, and don't want to think about email infrastructure.
Key Features
AI-Readable Documentation
Every doc page is available as clean Markdown (add .md to any URL), reducing token usage for LLMs and enabling AI coding assistants to generate correct integration code without hallucinations.
Native MCP Server (26 tools)
Optional MCP server with 26 tools lets AI agents (Claude, Cursor, Windsurf, etc.) manage email operations natively — send, verify, manage lists and suppression without wrapper code.
High-Performance Delivery & Deliverability
Sub-second email delivery with 99.9% deliverability backed by automatic SPF, DKIM, and DMARC configuration and real-time webhooks for delivery, opens, clicks, and bounces.
SDKs & Integrations
Official SDKs for Python, Node.js, Ruby, and Go plus SMTP relay support and seamless integrations with Supabase edge functions, Vercel serverless, n8n, and common automation pipelines.
Simple, Predictable Pricing
Straightforward pay-per-email pricing ($0.50 per 1,000 emails), $5 free credits to start, no tiers or surprise enterprise calls — designed for predictable developer usage.
How to Use Ark
1) Sign up at arkhq.io and create an API key (you get $5 in free credits). 2) Install the SDK for your stack (Python/Node/Ruby/Go) or configure SMTP relay for self-hosted tools. 3) Follow the AI-readable quickstart (.md docs) and either tell your AI assistant to add email to your feature or call the API from your signup/notification handlers. 4) Optionally enable the MCP server for agent-driven email tasks and configure webhooks to receive delivery, open, click, and bounce events.