email

# Email with StableEmail Send emails, manage inboxes, and run custom subdomains via x402 payments at `https://stableemail.dev`. ## Setup See [rules/getting-started.md](rules/getting-started.md) for installation and wallet setup. ## Quick Reference | Task | Endpoint | Price | |------|----------|-------| | Send email (shared) | `https://stableemail.dev/api/send` | $0.02 | | Buy subdomain | `https://stableemail.dev/api/subdomain/buy` | $5.00 | | Send from subdomain | `https://stableemail.dev/api/subdomain/send` | $0.005 | | Buy inbox | `https://stableemail.dev/api/inbox/buy` | $1.00 | | Send from inbox | `https://stableemail.dev/api/inbox/send` | $0.005 | | Top up inbox (30d) | `https://stableemail.dev/api/inbox/topup` | $1.00 | | Top up inbox (90d) | `https://stableemail.dev/api/inbox/topup/quarter` | $2.50 | | Top up inbox (365d) | `https://stableemail.dev/api/inbox/topup/year` | $8.00 | | List inbox messages | `https://stableemail.dev/api/inbox/messages` | $0.001 | | Read inbox message | `https://stableemail.dev/api/inbox/messages/read` | $0.001 | | Create subdomain inbox | `https://stableemail.dev/api/subdomain/inbox/create` | $0.25 | | List subdomain messages | `https://stableemail.dev/api/subdomain/inbox/messages` | $0.001 | | Read subdomain message | `https://stableemail.dev/api/subdomain/inbox/messages/read` | $0.001 | ### Free Management Endpoints | Task | Endpoint | |------|----------| | Subdomain status | `GET https://stableemail.dev/api/subdomain/status?subdomain=name` | | Update subdomain | `POST https://stableemail.dev/api/subdomain/update` | | Manage signers | `POST https://stableemail.dev/api/subdomain/signers` | | Inbox status | `GET https://stableemail.dev/api/inbox/status?username=name` | | List your inboxes | `POST https://stableemail.dev/api/inbox/list` | | Update inbox | `POST https://stableemail.dev/api/inbox/update` | | Cancel inbox | `POST https://stableemail.dev/api/inbox/cancel` | | Delete message | `POST https://stableemail.dev/api/inbox/messages/delete` | | List subdomain inboxes | `POST https://stableemail.dev/api/subdomain/inbox/list` | | Delete subdomain inbox | `POST https://stableemail.dev/api/subdomain/inbox/delete` | | Update subdomain inbox | `POST https://stableemail.dev/api/subdomain/inbox/update` | | Delete subdomain message | `POST https://stableemail.dev/api/subdomain/inbox/messages/delete` | Free endpoints use SIWX wallet authentication when needed, and `agentcash.fetch` handles that automatically for both GET and POST requests. ## Send an Email Send from the shared `relay@stableemail.dev` address: ```mcp agentcash.fetch( url="https://stableemail.dev/api/send", method="POST", body={ "to": ["recipient@example.com"], "subject": "Hello from x402", "html": "<h1>Hi!</h1><p>This email was sent via x402 payments.</p>", "text": "Hi! This email was sent via x402 payments.", "replyTo": "your-real-email@example.com" } ) ``` **Parameters:** - `to` — array of recipient emails (required) - `subject` — email subject (required) - `html` and/or `text` — email body (at least one required) - `replyTo` — reply-to address (optional but recommended) - `attachments` — array of `{content, contentType, filename}` (optional, max 5, base64 encoded, ~3.75MB limit each) **Attachment example:** ```json { "attachments": [{ "content": "base64-encoded-content...", "contentType": "application/pdf", "filename": "report.pdf" }] } ``` For calendar invites, use `contentType: "text/calendar; method=REQUEST"`. ## Forwarding Inbox Buy `username@stableemail.dev` for $1/month. Emails are forwarded to your real address and/or retained for programmatic access. ### Buy an Inbox ```mcp agentcash.fetch( url="https://stableemail.dev/api/inbox/buy", method="POST", body={ "username": "alice", "forwardTo": "alice@gmail.com" } ) ``` Omit `forwardTo` to use as a programmatic-only mailbox (retainMessages auto-enabled). ### Send from Inbox ```mcp agentcash.fetch( url="https://stableemail.dev/api/inbox/send", method="POST", body={ "username": "alice", "to": ["bob@example.com"], "subject": "Hello", "html": "<p>Hi Bob</p>", "text": "Hi Bob" } ) ``` ### Top Up Inbox ```mcp agentcash.fetch( url="https://stableemail.dev/api/inbox/topup", method="POST", body={"username": "alice"} ) ``` Anyone can top up any inbox. Top-ups stack. Bulk discounts: 90 days/$2.50 (17% off), 365 days/$8 (34% off). ### Cancel and Refund ```mcp agentcash.fetch( url="https://stableemail.dev/api/inbox/cancel", method="POST", body={"username": "alice"} ) ``` Returns pro-rata USDC refund on-chain automatically. ## Read Inbox Messages Enable message retention, then read messages programmatically. ### Enable Retention ```mcp agentcash.fetch( url="https://stableemail.dev/api/inbox/update", method="POST", body={"username": "alice", "retainMessages": true} ) ``` ### List Messages ```mcp agentcash.fetch( url="https://stableemail.dev/api/inbox/messages", method="POST", body={"username": "alice", "limit": 20} ) ``` ### Read a Message ```mcp agentcash.fetch( url="https://stableemail.dev/api/inbox/messages/read", method="POST", body={"messageId": "msg_abc123"} ) ``` Returns full message with from, to, subject, date, text, html, and attachment download URLs (URLs expire after 1 hour). Message content and attachments are retained for 90 days. ## Custom Subdomains Buy `yourname.stableemail.dev` for $5 one-time. Send from any address on your subdomain for $0.005/email. ### Buy a Subdomain ```mcp agentcash.fetch( url="https://stableemail.dev/api/subdomain/buy", method="POST", body={"subdomain": "yourname"} ) ``` Rules: 3-30 chars, lowercase alphanumeric + hyphens. DNS verification takes ~5 minutes. ### Send from Subdomain ```mcp agentcash.fetch( url="https://stableemail.dev/api/subdomain/send", method="POST", body={ "from": "support@yourname.stableemail.dev", "to": ["customer@example.com"], "subject": "Your order confirmation", "html": "<p>Thank you for your order!</p>" } ) ``` ### Create Subdomain Inboxes Create per-address inboxes on your subdomain ($0.25 each, max 100 inboxes, 500 messages each): ```mcp agentcash.fetch( url="https://stableemail.dev/api/subdomain/inbox/create", method="POST", body={ "subdomain": "yourname", "localPart": "support", "forwardTo": "team@company.com" } ) ``` ### Catch-All Forwarding Forward all unmatched addresses on your subdomain: ```mcp agentcash.fetch( url="https://stableemail.dev/api/subdomain/update", method="POST", body={"subdomain": "yourname", "catchAllForwardTo": "catch-all@company.com"} ) ``` ### Manage Authorized Signers Allow other wallets to send from your subdomain: ```mcp agentcash.fetch( url="https://stableemail.dev/api/subdomain/signers", method="POST", body={"action": "add", "subdomain": "yourname", "walletAddress": "0x..."} ) ``` ## Images in Emails Host images on StableUpload or AgentUpload, then reference in HTML: ```html <img src="https://f.stableupload.dev/abc/photo.png" alt="Photo" /> ``` Most email clients strip data URIs — always use hosted URLs. ## Workflows ### Quick Send - [ ] (Optional) Check balance: `agentcash.get_balance` - [ ] Send email via `/api/send` - [ ] Confirm delivery via messageId ### Set Up Professional Email - [ ] Buy subdomain ($5) - [ ] Wait for DNS verification (~5 min) - [ ] Create inboxes for team members ($0.25 each) - [ ] Set up catch-all forwarding - [ ] Send from custom addresses ($0.005 each) ### Programmatic Mailbox - [ ] Buy inbox with no forwardTo ($1) - [ ] Messages are retained automatically (90 days) - [ ] List and read messages via API ($0.001 each) - [ ] Delete messages when processed (free) ## Cost Estimation | Task | Cost | |------|------| | Send one email (shared) | $0.02 | | Send one email (subdomain/inbox) | $0.005 | | Buy inbox (30 days) | $1.00 | | Buy inbox (1 year) | $1.00 + $8.00 = $9.00 | | Buy subdomain + 5 inboxes | $5.00 + $1.25 = $6.25 | | Read 100 messages | $0.10 |