Click2Mail API Alternative

Looking at Click2Mail for programmatic mail? Mailsnail is the same idea built for AI agents: MCP-first, with agent-readable docs and a simple HTTP fallback.

click2mailcomparisonapi

· Updated

What you get

Click2Mail and Mailsnail both let your code put a real letter in the mail. The differences are in the surface area and the audience.

  • MCP-first. Mailsnail's primary surface is MCP, so any agent that speaks MCP can use it without you writing client code. The HTTP API exists too — see /openapi.json — but it's the fallback, not the front door.
  • Agent-readable docs. /llms.txt and /llms-full.txt are written to be ingested by language models cold. Drop the URL into a Claude conversation and it can integrate without further hand-holding.
  • No API keys, pay-per-piece. Add the server URL and sign in from your client. Pay for one letter by card, or fund a balance at our cost. No subscription.

When Click2Mail wins

If you're building a print-shop replacement or a mailroom automation tool with no AI in the picture, Click2Mail is mature and well-suited. Mailsnail is built around the assumption that an agent is the caller.

How to evaluate

The fastest test: in Claude Desktop, go to Settings → Connectors → Add custom connector, paste the URL https://api.mailsnail.dev/mcp and sign in, then ask the agent to draft and send a single letter (steps for other apps are on /setup). If that loop feels right for your use case, you're in the right place.

Wire Mailsnail into your agent

Add one URL and sign in. Nothing to install and no API key. In Claude Code:

Claude Code
claude mcp add -t http mailsnail https://api.mailsnail.dev/mcp

Then run /mcp and choose Authenticate. In Claude Desktop or ChatGPT, add https://api.mailsnail.dev/mcp as a custom connector. Cursor and other JSON-config clients take:

mcp.json
{
  "mcpServers": {
    "mailsnail": {
      "url": "https://api.mailsnail.dev/mcp"
    }
  }
}

A one-page letter is from $1.21, and preview_letter shows the proof and exact price before anything is charged. Setup for every app →

See also

Lob Alternative for AI Agents

Lob is great for batch direct mail. Mailsnail is built for the opposite shape: one piece at a time, decided and sent by an AI agent. Here's how they compare.

Physical Mail API for LLMs

An MCP-first physical-mail API designed to be discoverable, callable, and well-typed for large language models. Tool surface, agent-readable docs, and pricing.