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StableEmail Subdomain Send
emailsendinboxforwardingsubdomainsocial
StableEmail Subdomain Send is a paid API for AI agents from StableEmail at stableemail.dev, paid per call via MPP, $0.005/call, status unknown (last checked 2026-10-09).
Sends an email from a custom subdomain address on stableemail.dev at $0.005 per message
Price / call$0.005
Success—
StatusUnknown
How this service works
Send email from your custom subdomain on stableemail.dev ($0.005)
Output
A confirmation that the email was successfully sent from the specified subdomain address, typically including a message ID or delivery acknowledgment. Costs $0.005 USDC per send.
Example use cases
Example prompt
“Send an email from hello@mycompany.stableemail.dev to alice@example.com with subject 'Your order has shipped' and body 'Hi Alice, your order #1234 is on its way and should arrive by Friday!'”
Technical details
Endpoint
POSThttps://stableemail.dev/api/subdomain/send?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to send email from a specific custom subdomain address you own on stableemail.dev (e.g. noreply@yourbrand.stableemail.dev), rather than sending via the generic relay@stableemail.dev address. It is cheaper ($0.005 vs $0.02) and provides branded sender identity. Ideal for transactional emails, notifications, and automated outreach where a branded subdomain sender is important and no traditional email API keys or account setup is desired.
Side effects
- Invalid or unauthorized from address (not owned subdomain) — 401/403 error
- Invalid recipient email format — 400 validation error
- Missing required fields (from, to, subject) — 400 error
- Insufficient USDC balance — 402 payment required
- Attachment too large (>5MB per attachment, max 5 attachments) — 400 error
- Too many recipients (>50 in to or cc) — 400 error
- Subject line too long (>998 chars) — 400 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| cc | array | |
| torequired | array | |
| fromrequired | string | |
| html | string | |
| text | string | |
| replyTo | string | |
| subjectrequired | string | |
| attachments | array |
Tags
emailsendinboxforwardingsubdomainsocial
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