Ark

About Ark

Ark is the email API built from the ground up for developers who build with AI. It solves the frustrating time sink of integrating email functionality by making the process native to your AI coding assistant's workflow. Instead of writing wrapper code or debugging complex API integrations, you describe what you need in natural language to tools like Claude, Cursor, or Windsurf. Your AI reads Ark's purpose-built documentation and generates production-ready code for sending verification emails, password resets, notifications, and more. It's designed for developers who want to ship features quickly, automate with code, and stop thinking about email infrastructure. Ark delivers this through AI-readable Markdown documentation that cuts token usage by 10x, a native MCP server with 26 tools for direct AI control, and a predictable API that eliminates confusing edge cases. With sub-second delivery, 99.9% deliverability, and simple pay-per-email pricing, Ark removes the traditional complexity and cost barriers of email services.

Features of Ark

AI-First Documentation & MCP Server

Ark's core feature is its compatibility with AI coding assistants. Every documentation page is available in clean, AI-readable Markdown, reducing token usage by 10x and preventing hallucinations from HTML parsing. Furthermore, its native MCP (Model Context Protocol) server provides 26 tools, allowing Claude, Cursor, and Windsurf to directly manage email operations like checking delivery status or handling bounces through natural language, without requiring manual code.

Sub-Second Email Delivery

Ark is engineered for speed, boasting an average delivery time of under 200 milliseconds. This means verification emails arrive while a user is still on your signup page, and password resets hit inboxes almost instantly. This speed improves user experience, reduces support tickets, and ensures time-sensitive communications are effective.

Guaranteed Inbox Delivery

Ark handles the complex deliverability landscape for you. It automatically configures essential authentication protocols like SPF, DKIM, and DMARC for your domains. Combined with robust infrastructure, this results in a 99.9%+ inbox delivery rate, verified by third-party monitoring. You get reliable delivery without needing to become a DNS or email deliverability expert.

Simple, Transparent Pricing

Ark eliminates confusing tiered pricing and monthly minimums. You pay a flat rate of $0.50 per 1,000 emails sent, and that's it. The model includes unlimited team members, unlimited domains, full API access, and real-time analytics. You can start with $5 in free credits (5,000 emails) and only pay for what you actually use, whether it's 50 or 50,000 emails in a month.

Use Cases of Ark

User Onboarding & Verification

Quickly implement secure email verification flows for new user signups. Describe the feature to your AI assistant, and it will generate the code to send a confirmation link immediately after registration. With Ark's sub-second delivery, users can verify their accounts without leaving your app, reducing drop-off rates.

Transactional Notifications & Alerts

Send instant, reliable notifications for password reset requests, security alerts, order confirmations, or shipping updates. The predictable API and AI-generated code ensure these critical system emails are implemented correctly on the first try and land in the user's primary inbox.

Automated Workflow Integration

Integrate email into your existing automation pipelines. Use Ark's SDKs (Python, Node.js, Ruby, Go) to trigger emails from Supabase Edge Functions, n8n workflows, Vercel serverless functions, or any backend service. This enables complex, automated communication sequences without manual intervention.

Self-Hosted Application Relay

Use Ark as a full SMTP relay for your self-hosted tools and applications. Provide reliable, high-deliverability email sending for platforms like Listmonk for newsletters, Coolify for deployment notifications, or Metabase for report distribution, all without managing your own mail server.

Frequently Asked Questions

How long does setup actually take?

Most developers can send their first email with Ark in under 5 minutes. The process involves signing up for a free account, adding and verifying your sending domain (which Ark guides you through), and then using your AI assistant or the SDK to send a test email. The AI-friendly docs accelerate code generation significantly.

How does the AI integration actually work?

Ark provides documentation in pure Markdown format, which AI coding assistants like Claude and Cursor can parse efficiently. You simply ask your AI to implement an email feature and point it to Ark's docs. The AI reads the clear examples and predictable API structure to write correct, working code without the back-and-forth typically caused by complex HTML-based documentation.

What is an MCP server and why does it matter?

MCP (Model Context Protocol) is a standard that allows AI assistants to use external tools. Ark's MCP server offers 26 specific tools for email operations. This means your AI can do more than just write code; it can directly check an email's delivery status, manage suppression lists, or handle bounce events through a conversational interface within your IDE, granting deeper control.

Is there really no monthly fee or tiered plan?

Correct. Ark operates on a pure pay-per-email model. You are charged a flat $0.50 for every 1,000 emails you send. There are no monthly subscriptions, no tiers that gate features like analytics or multiple domains, and no overage charges. You receive $5 in free credits to start, and your cost scales linearly with your usage.

Pricing of Ark

Ark offers one simple, transparent pricing plan: $0.50 per 1,000 emails sent. This includes all features: unlimited team members, unlimited domains, access to the full MCP server with 26 tools, AI-readable documentation, real-time analytics, and a 99.99% uptime SLA. There are no monthly fees or tiered plans. New users start with $5 in free credits, which equates to 5,000 emails, and no credit card is required to begin. You only pay for the emails you actually send.