x402 Machine to Machine Email Server

What this is. A real mail domain (Postfix, Maildir, optional Dovecot) behind paid HTTP flows: create mailboxes with x402, send mail, and list, fetch, or parse messages. It turns standard email into a metered API your automation can call.

Why machines use it. Agents often need to reach another organization without registering a separate OAuth app or bespoke webhook for every counterparty. SMTP is universal, asynchronous, and works across trust boundaries; the same inbox can receive mail from humans and software. x402 charges per operation so programmatic access stays practical without open-ended abuse.

Free trial

Trial is OFF. The operator has disabled trial features in server policy.

Create mailboxes (x402) and read mail via paid list / fetch / attachment-parse flows. All mailbox tools lists every human flow. For routing and spam-check details, see How it works.

Pricing

Action	Price	What you get
Create mailbox	5.00 USDC	Provision a new mailbox account through the admin UI x402 flow.
List messages	0.01 USDC	Get a paid list of recent messages with Maildir id, subject, and date.
Get one message	0.01 USDC	Fetch full headers and body for a single message id.
Parse attachments	0.01 USDC	Extract attachment metadata, previews, and small payloads.
Send outbound mail	0.05 USDC	Send one outbound message through the mailbox over SMTP submission.
Move message	0.01 USDC	`POST /machine/request/move` — move a Maildir message between folders.
Delete message	0.01 USDC	`POST /machine/request/delete` — delete one message file.
Forward message	0.01 USDC	`POST /machine/request/forward` — forward via SMTP.
Reply	0.01 USDC	`POST /machine/request/reply`.
Reply all	0.01 USDC	`POST /machine/request/reply-all`.
Create folder	0.01 USDC	`POST /machine/request/folder/create` — Dovecot Maildir folder.
Rename folder	0.01 USDC	`POST /machine/request/folder/rename`.
Delete folder	0.01 USDC	`POST /machine/request/folder/delete`.
Reset mailbox password	1.00 USDC	Change password after proving the current password (`/machine/request/mailbox/reset-password`).
Download mailbox (Maildir zip)	1.00 USDC	HTTPS link to a zip of `~/Maildir`; link expires after 1 hour or 3 downloads (`/machine/request/mailbox/download`).
Add recovery email	1.00 USDC	While logged in, register a recovery address on a domain not hosted here (same list as create-user domains; `/machine/request/mailbox/recovery-email`).
Account recovery — request code	1.00 USDC	Forgot password: request a code to your registered recovery address (`/machine/request/account-recovery/request`).
Account recovery — set new password	1.00 USDC	Submit recovery code and new password (`/machine/request/account-recovery/complete`).
Check mailbox quota	0.01 USDC	Show configured quota (SQLite) and `doveadm quota get` output for the mailbox.
Trust index (list / add / update / delete)	0.01 USDC	Per request: view or edit `inbox_trust_tokens` / `spam_trust_tokens` in the local trust SQLite DB (same sender-memory index the inbound filter uses).
Storage 100 MB	4.00 USDC	Raises mailbox Maildir quota to 100 MB (over default 5M).
Storage 500 MB	7.00 USDC	Raises mailbox Maildir quota to 500 MB.
Storage 1 GB	12.00 USDC	Raises mailbox Maildir quota to 1 GB.

These prices are read live from the server mail policy configuration, so the page reflects the current configured USDC amounts. Per-action mailbox prices fall back to the server default mailbox action price (0.01 USDC) when unset.

What you can do here

Create user — New mailbox account after x402 payment.
List messages — Paid list of recent messages (Maildir id, subject, date).
Get message — Paid fetch full headers and body for one message id.
Parse attachments — Paid extract attachment metadata, previews, and small base64 payloads.
Check mailbox quota — Paid view Dovecot quota and SQLite tier row.
Trust index (SQLite) — 0.01 USDC per request to list, add, update, or delete inbox/spam trust rows.
Send message — Paid outbound mail from your mailbox (To / CC / BCC, subject, body).
Storage upgrade — Paid higher Maildir quota (SQLite + Dovecot).
Reset mailbox password — 1.00 USDC; must know current password.
Download mailbox (zip) — 1.00 USDC; link expires in 1 hour or after 3 downloads.
Trial balance — check remaining promo credit and expiry (requires username + password).
Add recovery email — 1.00 USDC; external address for forgot-password flow.
Account recovery (forgot password) — 1.00 USDC; code is emailed right after the fee (compose → pay, same idea as Send message).
Complete recovery (have code) — 1.00 USDC · compose (email, username) → pay → recovery code + new password.

Links use the same origin as this page (typically your mail host over HTTPS). Inbound domains and Postfix routing are configured on the server.