Ark

About Ark

Ark is the email API built from the ground up for the modern, AI-first developer workflow. It eliminates the traditional friction of integrating email functionality into applications by enabling AI coding assistants like Claude, Cursor, and Windsurf to write the integration code directly. The core value proposition is a seamless developer experience: you describe the email feature you need, and your AI reads Ark's purpose-built documentation to generate production-ready code that works on the first try. This allows developers to ship features like user verification, password resets, and notifications in minutes instead of days. Beyond AI integration, Ark provides a robust, developer-friendly platform with sub-second email delivery, industry-leading 99.9% deliverability through automatic security setup, and simple, transparent pay-per-email pricing. It's designed for developers and teams who automate with code, prioritize shipping features quickly, and want to offload complex email infrastructure without the headaches of monthly tiers or enterprise sales negotiations.

Features of Ark

AI-First Documentation & MCP Server

Ark's documentation is uniquely crafted for machine readability, available in clean Markdown format that cuts token usage by 10x and prevents hallucinations. This allows AI assistants to accurately understand and implement the API. Furthermore, its native MCP (Model Context Protocol) server provides 26 direct tools, enabling AI agents within Claude, Cursor, and Windsurf to manage email operations through natural language commands without requiring manual wrapper code, offering deeper control and automation.

Sub-Second Delivery & High Deliverability

Engineered for speed and reliability, Ark delivers emails in under 200 milliseconds on average. This means verification emails arrive while a user is still on your signup page, and password resets hit inboxes instantly. Combined with automatic configuration of SPF, DKIM, and DMARC, Ark ensures a 99.9%+ inbox placement rate, verified by third-party monitoring, so you never need to become a DNS expert to avoid the spam folder.

Simple, Transparent Pricing

Ark operates on a straightforward, usage-based model: $0.50 per 1,000 emails sent. There are no monthly tiers, no minimums, and no overage charges. You can send 50 emails one month and 50,000 the next, paying the same consistent rate. This model includes unlimited team members, unlimited domains, and full access to all features like the MCP server and real-time analytics from day one.

Seamless Stack Integration

Built to fit into any modern development pipeline, Ark offers SDKs for Python, Node.js, Ruby, and Go. It integrates effortlessly with Supabase Edge Functions, n8n workflows, Vercel serverless functions, and any other automation platform. For self-hosted tools like Listmonk, Coolify, or Metabase, Ark provides a full SMTP relay, ensuring compatibility across your entire stack.

Use Cases of Ark

AI-Generated User Onboarding Flows

Describe a need for a welcome or email verification sequence to your AI assistant. It will read Ark's docs, install the SDK, and generate the code for sending a templated verification email upon user signup, including creating the necessary endpoint to handle verification clicks. This automates a critical path in minutes, keeping you in your development flow.

Automated Transactional Notifications

Quickly add reliable, instant notifications for password resets, order confirmations, shipping updates, or security alerts. Your AI can set up the email logic within your existing application handlers, leveraging Ark's fast delivery to ensure time-sensitive information reaches users' inboxes immediately, enhancing user experience and trust.

Marketing & Newsletter Campaigns

Utilize Ark's SMTP relay to power self-hosted marketing tools like Listmonk or Metabase alerts. This allows you to send bulk campaign emails or scheduled reports while benefiting from Ark's high deliverability infrastructure and real-time webhook analytics for opens, clicks, and bounces, all without managing your own mail servers.

Internal System Alerts & Monitoring

Integrate Ark into your n8n workflows, Supabase functions, or other automation pipelines to send critical internal alerts. For example, receive instant email notifications for system errors, failed cron jobs, or new form submissions, ensuring your team stays informed about operational events directly in their inbox.

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 (no credit card required), adding and verifying your sending domain with automatic DNS guidance, and then using the provided SDK or having your AI assistant generate the integration code from the clear documentation.

How does the AI integration actually work?

Ark provides AI-friendly documentation in pure Markdown, which large language models process more efficiently and accurately. When you ask your AI coding assistant (like Claude in Cursor) to add an email feature, it fetches and reads these docs, then writes correct, context-aware code for your project. The built-in MCP server also gives AI agents direct tools to execute email-related tasks conversationally.

What is included in the free tier?

Ark offers a generous free tier to get started. New accounts receive $5 in credits, which equates to 5,000 emails, at no cost and without requiring a credit card. This allows you to fully test the integration, deliverability, and AI features in a production-like environment before any payment is necessary.

Can I use Ark with my existing email-sending tool?

Yes. Ark provides a full SMTP relay service, making it compatible with virtually any application or platform that can send email via SMTP, including self-hosted tools like Listmonk, Coolify, or legacy systems. You simply configure your tool to use Ark's SMTP credentials, and it will route all outgoing messages through Ark's high-deliverability infrastructure.

Pricing of Ark

Ark uses a simple, transparent pay-as-you-go pricing model. You are charged $0.50 for every 1,000 emails you send. There are no monthly subscriptions, no tiers that gate features, and no overage charges. Every account includes unlimited team members, unlimited domains, access to the full MCP server with 26 tools, AI-readable documentation, and real-time analytics. You start with $5 in free credits (5,000 emails), and you only pay for what you use beyond that.