Launching Aug 15

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

OPENCLAW

Register Mermail
on 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.

Open API KeysRead MCP docs

Why OpenClaw

Built for the agent you already use.

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

openclaw mcp set with streamable-http
Doctor probe before you trust the agent
Optional ClawHub skills for compose workflows
Same hosted MCP URL as every other client

Three steps to connect.

1

Create and export your API key

OpenClaw MCP uses Streamable HTTP + x-api-key, not OAuth. Create a project key in Settings → API Keys, then export it in the same shell you will use for openclaw mcp set.

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

Register Mermail MCP

Run in the same shell as the export so $MERMAIL_API_KEY expands. Paste sk-proj-YOUR_KEY only if you set the header inline.

Install
# Preferred — expands $MERMAIL_API_KEY
openclaw mcp set mermail '{"url":"https://console.mermail.app/mcp","transport":"streamable-http","headers":{"x-api-key":"'"$MERMAIL_API_KEY"'"}}'

# Alternative — paste your key inline
# openclaw mcp set mermail '{"url":"https://console.mermail.app/mcp","transport":"streamable-http","headers":{"x-api-key":"sk-proj-YOUR_KEY"}}'
3

Probe, then try a tool

Doctor must report a healthy Mermail connection before you rely on the agent.

Verify
openclaw mcp doctor mermail --probe
Ask: "List my Mermail mailboxes" (tool: list_mailboxes)

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.

How do I add a compose skill?+

Install from ClawHub (mermail/mermail-compose-email) and keep MCP registered separately with streamable-http + x-api-key.

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
Claude

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

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.

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.