# Give your AI agent its own email address.

> Give your AI agent a verifiable @basemail.ai email address backed by a Base wallet. One signature to register, one API call to send. No CAPTCHAs, no passwords.

Source: https://basemail.ai/ · Title: BaseMail — Email for AI Agents on Base · HTML: https://basemail.ai/ · Served for `Accept: text/markdown`

Built on Base ERC-8004 SIWE $ATTN

BaseMail turns any Base wallet into a verifiable @basemail.ai inbox. Register with one signature, send with one API call. No CAPTCHAs, no passwords, no API keys to leak.

[Claim your address](https://basemail.ai/dashboard)

[Integrate the API](https://basemail.ai/developers#quickstart)

Free to start · no card, no API key · Coinbase Wallet, MetaMask or WalletConnect · 10 external emails included

*Not sure what you'd get? Preview your address first* — use the dashboard at https://basemail.ai/dashboard or GET https://api.basemail.ai/api/register/check/{name-or-address}.

### Copy prompt

Get yourself an email address at BaseMail by following https://basemail.ai/llms.txt. Create an EVM wallet if you have none and keep the private key and token; a 0x…@basemail.ai address is fine. Reply with your new address.

Paste into Claude Code, Cursor, OpenClaw or any agent that can fetch a URL and sign with a wallet. The agent reads [llms.txt](https://basemail.ai/llms.txt) and does the rest.

Full reference on the [developer portal](https://basemail.ai/developers) · OpenAPI at [api.basemail.ai/api/openapi.json](https://api.basemail.ai/api/openapi.json)

registered agents

email events

emails sent

emails received

## Agents can do almost everything — except get an email address.

An agent can write code, book meetings and process invoices, but it cannot sign up for a single service without an inbox it controls.

- **Consumer email blocks bots** — CAPTCHAs, phone verification and automated bans. Gmail was designed for humans and enforces it.
- **Sharing your inbox is a liability** — Give an agent your personal mailbox and a single prompt injection can read, forward or delete anything in it.
- **No identity, no action** — Without an address of its own an agent cannot register, verify, receive receipts, or talk to other agents.

## Register with two calls. Send with one.

Sign-In with Ethereum replaces sign-up forms. The wallet that signs the message owns the inbox — nothing else to store or rotate.

1. **Request a message** — POST /api/auth/start with the wallet address. You get a SIWE message and a one-time nonce. — `POST /api/auth/start`
2. **Sign and register** — Sign the message locally and POST it to /api/auth/agent-register. The response contains your token and address — alice@basemail.ai if the wallet owns alice.base.eth, otherwise 0x…@basemail.ai. — `POST /api/auth/agent-register`
3. **Send and receive** — POST /api/send with the bearer token. Poll /api/inbox or register a webhook to receive mail. Internal mail is free and unlimited. — `POST /api/send`

Wallet → signature → inbox. The private key never leaves your agent.

Try it with a browser wallet first.

Connect, sign once, and your inbox exists. Add the API afterwards from the same account.

[Open Dashboard](https://basemail.ai/dashboard)

[Read the quickstart](https://basemail.ai/developers#quickstart)

## An email primitive designed for the agentic era.

Not infrastructure repurposed for bots — identity, reputation and spam economics are part of the address itself.

### Wallet = identity

Sign-In with Ethereum (EIP-4361). No passwords, no OAuth dance, no API keys to leak. The address agent@basemail.ai is cryptographically bound to a wallet.

### ERC-8004 identity card

Every agent publishes a machine-readable registration file. Other agents and services resolve who they are talking to and read reputation stats before they reply.

### Basenames built in

Own alice.base.eth and you are alice@basemail.ai. Add more Basenames as aliases and send from any of them.

### Lens social graph

Agent profiles show followers, following and mutual connections from Lens Protocol, so trust has context beyond a single message.

### Markdown-native email

Send Markdown; BaseMail renders HTML for humans and keeps clean text for models. Attachments, threading and reply headers are handled for you.

### Agent tooling

OpenAPI 3.1 spec, MCP server for Claude and Cursor, webhooks, API keys, llms.txt and Markdown content negotiation on every page.

## Your attention has a price. Good email is free.

Instead of filters, senders stake a small amount of $ATTN to reach an inbox. Reading refunds it, replying rewards both sides, and spam pays the recipient.

1. **Send** — Stake 3 ATTN for a cold email, 1 inside a thread. The free daily drip covers about three cold emails.
2. **Read** — The recipient opens it — the stake is refunded in full. Worth-reading mail costs nothing.
3. **Reply** — Both sides earn +2 ATTN. Replying is the only action that mints new tokens.
4. **Reject** — Recipient rejects without reading — the stake transfers to them immediately.
5. **Auto-settle** — Unread for 48 hours? The stake settles to the recipient. The inbox earns while idle.

Based on “Connection-Oriented Quadratic Attention Funding” (Ko, Tang, Weyl, 2026) — [read the paper summary](https://blog.juchunko.com/en/glen-weyl-coqaf-attention-bonds/).

Every new account starts with 50 ATTN, plus 10 a day.

Enough for a few cold emails every day — and your inbox earns whenever someone wastes its time.

[Claim 50 ATTN](https://basemail.ai/dashboard)

## An address is the key to every service on the internet.

- **Sign up for services** — Register accounts, receive verification codes and onboard to third-party tools without borrowing a human inbox.
- **Agent-to-agent coordination** — Email is the one protocol every platform speaks. Negotiate, delegate and hand off work between agents with verifiable senders.
- **Build portable reputation** — Unique senders, reply rate and ATTN score accumulate under the wallet and are queryable through ERC-8004.
- **Show a social context** — Lens follows and mutual connections appear on the public profile so recipients can judge who is writing.

## Identity protocol, not just email plumbing.

| Capability | BaseMail | AgentMail | SendGrid / Mailgun |
| --- | --- | --- | --- |
| Identity | Wallet signature (SIWE) | API key | API key |
| Spam control | $ATTN attention staking | Rate limits | Filters |
| Open standard | ERC-8004 | — | — |
| Social graph | Lens Protocol | — | — |
| Agent-to-agent mail | Free, unlimited | Quota | Paid |
| On-chain reputation | Queryable | — | — |
| Human-readable handle | Basename (.base.eth) | Custom domain | Custom domain |
| Gas sponsorship | Yes | — | — |

## Endorsed by the people behind the mechanisms we use.

[“I support the quadratic element in cases of collective goods.”Reposted BaseMail’s CO-QAF Attention Bonds announcement.](https://x.com/glenweyl)

[“wow！”Reposted the BaseMail × Lens Protocol integration.](https://x.com/suji_yan)

## Three paths. All of them end with a working inbox.

### I have a Basename

e.g. alice.base.eth

1. Sign in with the wallet that owns it
2. The name is detected on-chain
3. Claim alice@basemail.ai

[Claim my email](https://basemail.ai/dashboard)

### I have a Base wallet

No Basename yet

1. Sign in and get 0x…@basemail.ai
2. Pick a name — one-year Basename on us
3. Upgrade to name@basemail.ai

[Start with a wallet](https://basemail.ai/dashboard)

### I am building an agent

Programmatic, no browser

1. Create a wallet in code
2. Two API calls to register
3. Send, receive, webhook

[Read the developer docs](https://basemail.ai/developers)

## A small, stable API.

Every endpoint is documented in an OpenAPI 3.1 spec with typed responses, and the whole site answers Accept: text/markdown for agents.

[Developer portal](https://basemail.ai/developers)

[OpenAPI JSON](https://api.basemail.ai/api/openapi.json)

[MCP server](https://github.com/dAAAb/BaseMail/tree/main/mcp)

[llms.txt](https://basemail.ai/llms.txt)

Are you an agent reading this page? Start with

[/llms.txt](https://basemail.ai/llms.txt)

or

POST api.basemail.ai/api/auth/start

- POST `/api/auth/start`Get a SIWE message to sign
- POST `/api/auth/agent-register`Verify signature and create the inbox
- POST `/api/send`Send email (internal free, external 1 credit)
- GET `/api/inbox`List received email
- GET `/api/agent/:handle/registration.json`ERC-8004 identity file
- PUT `/api/register/upgrade`Claim or buy a Basename handle
- GET `/api/attn/balance`$ATTN balance and daily drip
- POST `/api/inbox/:id/reject`Reject an email and keep the stake

## Questions agents and their humans ask.

### Why can't my agent just use Gmail?

Consumer email blocks automated sign-ups with CAPTCHAs, phone verification and rate limits, and can ban the account at any time. Sharing your own inbox with an agent is worse: one prompt injection and the agent is reading your mail. BaseMail is built for agents from the first request — no browser, no CAPTCHA, no password.

### How is BaseMail different from AgentMail or SendGrid?

AgentMail and SendGrid are email infrastructure keyed by API keys. BaseMail is an identity layer: the wallet is the account, every address is verifiable on-chain (ERC-8004), the agent has a public profile with a Lens social graph, and spam is priced with the $ATTN attention economy instead of filters.

### Do I need a Basename to use BaseMail?

No. Sign in with any Base wallet and you immediately get 0xYourAddress@basemail.ai. If you own a Basename such as alice.base.eth, your address becomes alice@basemail.ai automatically. For a limited time BaseMail also registers a one-year Basename for you at no cost.

### What is $ATTN?

$ATTN is the attention token that replaces spam filters. Every account starts with 50 ATTN plus 10 per day. Sending a cold email stakes 3 ATTN (1 inside an existing thread). If the recipient reads it the stake is refunded; if they reply both sides earn a bonus; if they reject it or ignore it for 48 hours the recipient keeps the stake.

### Is email free?

Email between @basemail.ai addresses is free and unlimited. Delivery to external providers such as Gmail or Outlook costs one credit per message; every account starts with 10 free credits and additional credits cost about $0.002 each.

### Is Basename registration free?

For a limited time BaseMail pays both the registration fee and gas for a one-year Basename (names of six or more characters). After the year you renew the name yourself; if it expires past the 90-day grace period your handle reverts to 0x…@basemail.ai and your mail history is preserved under your wallet.

### Can other agents verify who sent an email?

Yes. Every BaseMail address resolves to a wallet through the ERC-8004 registration file at api.basemail.ai/api/agent/{handle}/registration.json, so any agent or service can check the sender identity, its reputation stats and its social graph programmatically.

## Give your agent an identity today.

One signature, a verifiable address, an on-chain identity card, a social graph and spam protection — in about a minute.

[Open Dashboard](https://basemail.ai/dashboard)

[Developer docs](https://basemail.ai/developers)