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Crier Email Relay
x402
Crier Email Relay is a paid API for AI agents from crier.vimabrosta.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-18).
Send a one-time email from an AI agent to a person via a managed relay, with rate limiting, bounce/complaint suppression, and delivery status polling.
Price / call$0.01
Success—
StatusUnknown
How this service works
Send an email from an AI agent to a person: subject, plain text (HTML optional), an optional reply-to. Delivered from a fixed relay address with a footer naming the relay and an unsubscribe link, retried on failure, with a status endpoint you can poll. Addresses that bounce, complain, or unsubscribe are refused to every future sender. Up to 4 per hour and 12 per day to one address. One-time $0.01, no account needed.
Output
A JSON response containing a message ID and a status endpoint URL that the agent can poll to check whether the email was accepted, queued, delivered, bounced, or failed. If the recipient has previously bounced, complained, or unsubscribed, the request is refused immediately with an error.
Example use cases
Agent alerting a user to anomaly
“Email alex@company.com with subject 'Unusual login detected on your account' and body 'We noticed a login from a new device at 3:14am UTC. If this wasn't you, please reset your password immediately.' — show the sender name as 'Security Bot' and set reply-to to security@company.com.”
Order confirmation from e-commerce bot
“Send a confirmation email to customer@gmail.com with subject 'Order #8872 Confirmed' and a plain text body that says 'Thank you for your purchase! Your items will ship within 2 business days.' — display name should be 'Shop Assistant'.”
Scheduled newsletter delivery by agent
“Email reader@newsletter.io with subject 'Your Weekly Digest – May 20' and a plain text summary of this week's top stories, plus an HTML version with bold headlines. Use reply-to noreply@newsletter.io and show sender as 'Weekly Digest'.”
Technical details
Endpoint
POSThttps://crier.vimabrosta.com/v1/emailWhen to prefer
Choose this endpoint when an AI agent needs to send a single transactional or notification email to a person without setting up SMTP infrastructure or creating an account. It is ideal for low-volume, agent-initiated outreach where built-in rate limiting, bounce suppression, and unsubscribe compliance are required. At $0.01 per send with no subscription, it suits sporadic or pay-as-you-go agent workflows. Prefer alternatives like SendGrid or Mailgun when you need bulk sending, custom sending domains, or high-volume throughput beyond 12 emails/day per recipient.
Side effects
- Recipient has previously bounced, complained, or unsubscribed — request refused for all future senders
- Rate limit exceeded: more than 4 emails/hour or 12 emails/day to the same address
- Invalid email address format for 'to' or 'reply_to' fields
- Text body exceeds 20,000 character limit
- Subject exceeds 200 character limit
- HTML body exceeds 64KB limit
- Payment not provided or invalid — x402 payment of $0.01 USDC required
- Relay delivery failure after retries — status endpoint will reflect final failed state
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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