Build. Win. $500

Join
Get started

CLAUDE CODE

Give Claude Code
a real inbox.

Connect OAuth and install 15 skills for inbox, verification, and x402 workflows.

Start setupRead Skills docs

Why Claude Code

Built for the agent you already use.

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

Fifteen focused skills plus hosted MCP tools
OAuth unlocks full-profile PayBox and x402 tools
Works beside the Mermail CLI for scripts
Same mailbox and payment layer as every other client

Before you start

Check 3 things.

claude --version works.

You can sign in to the intended Mermail workspace.

node and npx work; restart Claude Code after install.

Claude Code setup docs

Success contract

Done when all 3 pass.

/mcp shows Mermail connected.

list_mailboxes succeeds.

A new session can invoke mermail-manage-inbox.

Three steps to connect.

1

Connect MCP with OAuth

Run both commands, then open /mcp and select Authenticate.

MCP
claude --version
claude mcp add --transport http --scope user mermail https://console.mermail.app/mcp
2

Install all Mermail skills

Install all 15 skills globally.

Install
npx --yes skills add Nudgen-Marketing/mermail-skills --agent claude-code --skill '*' --global --yes
3

Inspect MCP, then run a skill

Verify MCP first, then invoke a skill.

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

A FEW GOOD QUESTIONS

Questions,
answered.

Fast fixes for auth, setup, and discovery.

Does Claude Code use OAuth or an API key?

Use OAuth. API keys cannot unlock PayBox or x402.

Claude Code cannot find Mermail tools.

Reconnect Mermail in /mcp, finish OAuth, then start a new session. Keep the tool name Claude Code shows.

See all integrations

Integration index
ChatGPT

Add Mermail as a custom OAuth app in an eligible ChatGPT workspace.

Codex

Connect OAuth and install 15 skills for inbox and x402 workflows.

Cursor

Add the hosted MCP server with OAuth—no API key required.

Grok

Connect Mermail to Grok web chat and Grok Bot with OAuth, PayBox, and inline MCP Apps.

OpenClaw

Connect with OAuth, then verify Mermail with a live probe.

Hermes

Add Mermail to Hermes with Streamable HTTP OAuth.