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Bismuth Email
x402
Bismuth Email is a paid API for AI agents from x402-email-api-production.up.railway.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Sends transactional emails via Resend with support for CC/BCC recipients and base64-encoded file attachments
Price / call$0.01
Success—
StatusUnknown
How this service works
Transactional email via Resend with CC/BCC and base64 file attachments. Part of the Bismuth utility API suite for AI agents.
Output
A confirmation response indicating whether the email was successfully dispatched via Resend. The response body is minimal — success or failure signal.
Example use cases
Automated invoice delivery workflow
“Send an email to the customer at their address with their monthly invoice as a PDF attachment and CC their accounting department so everyone stays in sync.”
User notification with report file
“Email the team lead at their work email with this month's performance report as an HTML attachment, and make sure to BCC the HR department for record-keeping.”
Order confirmation to multiple parties
“Send order confirmation emails to the customer and vendor with the order details in HTML format, attach the purchase agreement as a base64-encoded PDF, and CC the finance team on both.”
Technical details
Endpoint
POSThttps://x402-email-api-production.up.railway.app/sendWhen to prefer
Choose this endpoint when an AI agent needs to send transactional or notification emails programmatically with optional attachments (base64 files up to 25MB), CC/BCC, and HTML support — especially in x402 micropayment-enabled workflows. Prefer over SMTP or other email APIs when operating within the Bismuth/x402 agent payment ecosystem and you need a simple per-call pricing model at $0.01 USDC.
Side effects
- Missing required fields (to, subject, or body) returns a validation error
- Invalid email address format causes delivery failure
- Attachment exceeds 25MB pre-encoding cap per file
- Email body exceeds 100KB limit
- Invalid base64 encoding for attachments causes rejection
- Payment not included or insufficient USDC causes x402 payment-required error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| cc | string | Carbon copy recipients |
| torequired | string | Recipient email address |
| bcc | string | Blind carbon copy recipients |
| bodyrequired | string | Email body — HTML or plain text (max 100 KB) |
| subjectrequired | string | Email subject (max 998 chars per RFC 5321) |
| reply_to | string | Optional reply-to address |
| attachments | string | Base64-encoded file attachments (25MB pre-encoding cap per file) |
Output
Schema · Response
{}Tags
x402
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