Launching Aug 15

Mermail — Your AI can now sign up and pay, featured on Product Hunt

CLAUDE

Give Claude
a real inbox.

Install the Mermail plugin so Claude can provision an inbox, read verification mail, and finish paid workflows without leaving the terminal.

Open API KeysRead Skills docs

Why Claude

Built for the agent you already use.

Mermail gives Claude a dedicated inbox and payment layer so verification, checkout, and receipts stay in the same loop.

Eleven focused skills plus hosted MCP tools
API key stays in MERMAIL_API_KEY, not the manifest
Works beside the Mermail CLI for scripts
Same mailbox and payment layer as every other client

Three steps to connect.

1

Export MERMAIL_API_KEY

Create a project key in Settings → API Keys. The plugin expands ${MERMAIL_API_KEY} into x-api-key — export before launching Claude.

Auth
export MERMAIL_API_KEY="sk-proj-YOUR_KEY"
2

Install the Mermail plugin

Run inside Claude. The plugin ships 11 skills and wires MCP to console.mermail.app/mcp. Run /reload-plugins after install or update.

Install
/plugin marketplace add Nudgen-Marketing/mermail-skills
/plugin install mermail@mermail
/reload-plugins
3

Inspect MCP, then run a skill

Confirm Mermail tools, then invoke a focused skill workflow such as mermail-manage-inbox.

Verify
/mcp
Ask: "List my Mermail mailboxes" (tool: list_mailboxes)
Ask: "Use mermail-manage-inbox to summarize unread mail"

Questions, answered.

Auth, transports, and how to confirm the connection before you trust the agent.

Where do I create an API key?+

Open console Settings → API Keys, create a project key (sk-proj-…), and export MERMAIL_API_KEY in the environment your agent uses.

Does Claude use OAuth or an API key?+

The Claude plugin uses your exported MERMAIL_API_KEY for MCP. Create the key in Settings → API Keys before installing the plugin. Claude.ai custom connectors can use OAuth; that is a different host.

How do I know Mermail is connected?+

Ask the agent to list your Mermail mailboxes. A healthy connection exposes the hosted MCP tools, including list_mailboxes.

Can I use the CLI instead?+

Yes. Install mermail-cli (Node.js 22+) for scripted Sold API calls: mermail doctor, mermail auth check, mermail workspaces list, mermail mailboxes list. Prefer CLI for batch work and MCP for interactive inbox tools. Destructive CLI commands need --yes when non-interactive.

See all integrations

Integration index
ChatGPT

Add Mermail as a custom ChatGPT connector. Streamable HTTP plus OAuth — no API key in the connector. Then ChatGPT can list mailboxes, read mail, and finish paid workflows.

Codex

Install the Mermail plugin so Codex maps MERMAIL_API_KEY into MCP, loads 11 skills, and can list mailboxes, draft replies, and complete checkout.

Cursor

Install the hosted MCP server with OAuth. Cursor discovers Protected Resource Metadata after a 401, then your agent can read mail and act on payments inside the IDE.

OpenClaw

Point OpenClaw at hosted MCP with Streamable HTTP and x-api-key. Probe the connection, then let the agent manage inboxes and payment receipts.

Hermes

Add Mermail as a Streamable HTTP MCP server in Hermes Agent. OAuth opens a browser, then the agent can list mailboxes, read mail, and finish paid workflows in chat.