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CODEX

Install Mermail
in Codex.

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

Start setupRead Skills docs

Why Codex

Built for the agent you already use.

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

Native Codex MCP OAuth
Fifteen skills plus the hosted MCP tool catalog
No API key pasted into config or shell history
CLI available for batch and CI scripts

Before you start

Check 3 things.

codex --version works.

You can sign in to the intended Mermail workspace.

node and npx work; restart Codex after install.

Codex MCP docs

Success contract

Done when all 3 pass.

codex mcp list and /mcp show Mermail connected.

list_mailboxes succeeds.

A new session discovers the Mermail skills.

Three steps to connect.

1

Connect MCP with OAuth

Run all commands and select the intended workspace.

MCP
codex --version
codex mcp add mermail --url https://console.mermail.app/mcp
codex mcp login mermail
2

Install all Mermail skills

Install all 15 skills globally.

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

New session, then verify

Start a new session, open /mcp, then run the check.

Verify
/mcp
Ask: "List my Mermail mailboxes" (tool: list_mailboxes)

A FEW GOOD QUESTIONS

Questions,
answered.

Fast fixes for auth, setup, and discovery.

Why does this guide use OAuth?

OAuth enables PayBox and x402. API keys do not.

Mermail is listed but tools are stale.

Run codex mcp logout mermail, log in again, then start a new session and test list_mailboxes.

See all integrations

Integration index
Claude Code

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

ChatGPT

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

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.