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  "path": "/cailab/caicom-a-custodial-caicom-email-multi-chain-stablecoin-wallet-and-mcp-installable-agent-api-6m3",
  "publishedAt": "2026-07-04T15:42:03.000Z",
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  "tags": [
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    "@cai",
    "@cai.com",
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  "textContent": "#  CAI.com — a custodial @cai.com email, multi-chain stablecoin wallet, and MCP-installable agent API\n\nA custodial email, a stablecoin wallet, a credential vault, and an agent-ready API — all at one `@cai.com` address.\n\nThis post walks through what CAI is, what you get when you sign up, and how to wire the agent side into any MCP-compatible host.\n\n##  What you get at cai.com/app\n\nA free `@cai.com` email comes with four product surfaces, all under one account:\n\n  * **A real inbox at`@cai.com`.** Send and receive mail like any other address. The signup gives you the address; the dashboard gives you the SMTP/IMAP credentials if you want to use a desktop client.\n  * **A custodial multi-chain stablecoin wallet.** Built in. Six chains. External wallets supported. MoonPay for fiat on-ramp (partial-live, third-party KYC and region limits apply — see `cai.com/capabilities.html`).\n  * **A user vault for site credentials.** Store website logins and passwords. The agent you build retrieves them when needed, with your explicit confirmation. The vault is for _your_ site credentials, not the agent's API key.\n  * **An API key for the agent you build or use.** Free tier covers read scopes; `pay` and `full` scopes may require verification. The key is in the account dashboard.\n\n\n\n##  How the signup works\n\nThe signup at `cai.com/app` is four steps. About 2 minutes.\n\n  1. Go to `cai.com/app`. Pick \"Apply for `@cai.com` email.\"\n  2. Enter your name. That's the only field on the first screen.\n  3. CAI emails a 6-digit verification code to the address you provide. The code expires in 15 minutes. The email has a one-time link, not the code — copy the code from the email and paste it into the form.\n  4. Enter the code, create a password, and you're done.\n\n\n\nAt the end you have:\n\n  * A `@cai.com` email address.\n  * A custodial multi-chain stablecoin wallet.\n  * A user vault for site credentials.\n  * An API key for the agent you build or use.\n\n\n\nNo card. The email is free.\n\n##  The agent side (for the technical reader)\n\nFor the technical reader, the agent side is the reason to look at CAI. The install is one command:\n\n\n\n    npm i -g @cailab/mcp\n\n\nThe package is the MCP server — a thin wrapper around the CAI HTTPS Edge API at `https://api.cai.com/functions/v1`. It drops into MCP-compatible hosts including OpenClaw, Hermes, and Codex (see `cai.com/developers.html` for the current host list). Once installed, the agent can call `GET /get-identity`, `POST /get-wallet-balances`, `POST /wallet-custodial-transfer`, and the rest of the CAI surface — without the user pasting a private key in chat.\n\nThe contract an agent reads first is `cai.com/skill.md`. It's the canonical source-of-truth for what CAI can do, written in a format agents parse. The companion artifact is the A2A Agent Card at `cai.com/.well-known/agent.json` — that's how agents discover CAI in agent-to-agent registries.\n\n##  If you tried this and hit a bug\n\n**Comment below with:**\n\n  1. **What you ran** — the install command, the request, the MCP host config. Copy the actual command or request.\n  2. **What you expected** — one sentence.\n  3. **What you got** — the error message, the empty response, the unexpected behavior. Paste it verbatim.\n  4. **Your environment** — OS, Node version, the MCP host (OpenClaw / Hermes / Codex / Cursor / other), the CAI account tier if relevant.\n\n\n\nEvery comment on this article gets read. Bug reports will be replied to within 24 hours. Friction points shape what we document next.\n\nDocumentation: `cai.com/skill.md` · `cai.com/developers.html` · `cai.com/app` to sign up.",
  "title": "CAI.com — a custodial @cai.com email, multi-chain stablecoin wallet, and MCP-installable agent API"
}