Public REST API and hosted MCP server — one key per workspace, with the rights you tick.
Drive Mailcheer from your AI agent.
Claude Code, ChatGPT, Codex, your terminal — and your own application. One page per tool gives the exact command and what the agent is allowed to do.
One move
One line to paste. Nothing else to learn.
A single line is all it takes:
Read mailcheer.com/claude-code/install and connect Mailcheer for me.
Your agent reads the install guide and connects itself. All you paste is the key you created under Settings → API — it decides which workspace is linked and what is allowed. After that, you simply ask, in plain words.
How to connect, tool by tool
Each page gives the exact command, the check that proves it worked, and what the agent cannot do. The install guide sits at the end of every one.
- Claude CodeOne command, and Mailcheer's MCP server is connected: your campaigns, lists and sends are driven from the session you already have open. Connect Claude Code →
- ChatGPTA connector to add in your settings: you describe the campaign, it shows up as a draft in your workspace, ready to review. Connect ChatGPT →
- CodexThe same MCP server on the Codex side — CLI as well as app — to chain writing, testing and sending without switching tools. Connect Codex →
- Terminal & scriptsThe REST API, bare, called with curl or from any language: for your scripts, your cron jobs and the agent of your choice. Nothing to install. Drive it from a terminal →
- In your own applicationThe REST API, called from your code, with one key per service: your product sends its transactional email from your own domain. No library to install. Connect your application →
And without an agent?
Everything can be done by hand too, in the interface: 3,000 emails a month on the free plan, no credit card. Your list, forms, imports, campaigns and their sending need no agent at all.
The writing assistant needs no agent either: it suggests subject lines, rewrites a passage, drafts a letter — without ever using up your sending credits, which are counted separately.
Not sure which one?
You work in a terminal
Claude Code or Codex: one command, and Mailcheer's tools appear in the session you already have open.
You prefer raw commands
The REST API, with curl: everything is scriptable, and plugs into the agent of your choice. Nothing to install.
Your product sends the email
The public API: your application sends its transactional email from your own domain, with the same fields as Resend.
Get started
Create an account, add your sending domain, create a key: connecting takes one command. 3,000 sends a month free, no credit card.
Once your account exists, Settings → API creates your keys, cuts the ones you no longer want, and shows what your agents actually did.