Ark

About Ark

Ark is the email API built for the new era of development, where your AI assistant is your primary coding partner. It's not just another email service; it's a complete infrastructure layer designed to be understood and implemented by AI. For developers using Claude, Cursor, Windsurf, or other AI agents, Ark transforms email from a complex, time-consuming integration into a simple natural language request. You describe the feature you need—like "add a password reset email"—and your AI reads Ark's purpose-built documentation to write production-ready code that works on the first try. This eliminates the endless cycle of debugging wrapper code and scouring Stack Overflow, letting you stay in your creative flow. Built for developers who ship with AI and automate with code, Ark provides sub-second email delivery, 99.9% deliverability with automatic security setup, and seamless integration into any modern stack, from Supabase to Vercel. Its core promise is simple: stop thinking about email infrastructure and get back to building features.

Features of Ark

AI-First Documentation & MCP Server

Ark's documentation is engineered for machine readability, available in clean Markdown that cuts token usage by 10x and prevents hallucinations. This allows your AI assistant to accurately understand and implement the API. Furthermore, its native MCP server with 26 tools lets AI agents like Claude directly manage email operations—sending, checking status, handling bounces—through natural language, eliminating the need for manual code for common tasks.

Sub-Second Delivery & Guaranteed Inbox Placement

With an average delivery time under 200ms, Ark ensures your transactional emails—like verification codes or password resets—arrive while the user is still engaged on your page. Combined with automatic SPF, DKIM, and DMARC configuration, it achieves a 99.9% deliverability rate verified by third-party monitoring, landing your emails in the inbox, not spam, without requiring any DNS expertise from you.

Simple, Transparent Pay-Per-Email Pricing

Ark eliminates complex tiers and monthly fees. You pay a single, straightforward rate of $0.50 per 1,000 emails sent. There are no monthly minimums, unused capacity charges, or hidden fees. You can send 50 emails one month and 50,000 the next, always at the same predictable cost. This model includes unlimited team members and domains, making it scalable and simple.

Seamless Integration for Any Stack

Whether you're working with Supabase edge functions, n8n workflows, Vercel serverless, or a custom automation pipeline, Ark fits right in. It offers full SDKs for Python, Node.js, Ruby, and Go, and also functions as a full SMTP relay for self-hosted tools like Listmonk, Coolify, and Metabase, providing flexibility without sacrificing power or reliability.

Use Cases of Ark

AI-Assisted Feature Implementation

Describe an email feature to your AI coding assistant within Cursor or Claude Code. The AI reads Ark's docs and automatically generates the integration code for verification emails, password resets, or notifications, implementing a complete, working feature in minutes instead of days, allowing you to move immediately to your next task.

Transactional Email for Applications

Provide reliable, instant communication for your web or mobile app. Use Ark to send critical user-facing emails like account verification links, one-time passwords (OTP), security alerts, and purchase receipts, ensuring they are delivered in seconds with high inbox placement to maintain user trust and engagement.

Automated Workflow Notifications

Integrate Ark into automation platforms like n8n or use its SDKs within backend scripts to trigger email notifications based on specific events. This is perfect for sending internal alert emails for system monitoring, notifying customers of order status updates, or delivering automated weekly digests and reports.

Self-Hosted Tool Integration

Utilize Ark's full SMTP relay capability to power email sending from your favorite self-hosted platforms. Easily configure tools like Listmonk for newsletters, Coolify for deployment notifications, or Metabase for report distribution, leveraging Ark's robust deliverability and infrastructure without managing your own mail servers.

Frequently Asked Questions

How long does setup actually take?

Most developers send their first email with Ark in under 5 minutes. The process involves signing up for an account (which includes free credits), adding and verifying your sending domain with automatic DNS configuration, and then using the AI-friendly docs or an SDK to make your first API call. The integration is designed for immediate productivity.

How does Ark ensure my emails don't go to spam?

Ark automatically handles the critical technical authentication standards for you. Upon domain verification, it guides you through setting up SPF, DKIM, and DMARC records, which are essential signals to inbox providers that your emails are legitimate. This, combined with maintained sending reputations, results in a 99.9%+ deliverability rate.

What makes Ark's documentation "AI-friendly"?

Ark provides all its API documentation in clean, structured Markdown format (simply add .md to any docs URL). This format is vastly more efficient for AI models to parse compared to standard HTML web pages, using up to 10x fewer tokens and providing clear, consistent information that drastically reduces the chance of the AI generating incorrect or hallucinated code.

Can I use Ark with my existing codebase and tools?

Absolutely. Ark is built for seamless integration. It offers official SDKs for popular languages like Python, Node.js, Ruby, and Go. It also works as a drop-in SMTP relay for any tool that can send email via SMTP, such as self-hosted mailing list software or internal dashboards, making it versatile for both new projects and existing infrastructure.

Pricing of Ark

Ark offers a simple, transparent pricing model with no monthly tiers or commitments. You pay only for what you send at a rate of $0.50 per 1,000 emails. This includes all features: unlimited team members, unlimited domains, access to the full MCP server, AI-readable documentation, and real-time analytics. New users start with $5 in free credits (equivalent to 5,000 emails) to begin sending immediately without a credit card.