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Fastsend SMS & Email Messaging API
x402
Fastsend SMS & Email Messaging API is a paid API for AI agents from fastsend.dev, paid per call via x402, $0.165/call, status unknown (last checked 2026-09-30).
Send an SMS or email message to a specified recipient via Fastsend's messaging platform.
Price / call$0.165
Success—
StatusUnknown
How this service works
Send an SMS or email message via Fastsend.
Output
A confirmation response indicating whether the message was successfully dispatched, typically including delivery status and message metadata such as message ID.
Example use cases
Order shipment SMS notification
“Text my customer at +14155552671 from +18005550100 via SMS to let them know: 'Your package has shipped and is on its way — expected delivery is tomorrow by 5pm.'”
Password reset email alert
“Send an email to user@example.com from no-reply@myapp.com with subject 'Reset Your Password' and body 'Click here to reset your password: https://myapp.com/reset?token=abc123'”
Appointment reminder text message
“Send an SMS from +18005550199 to +13105559876 reminding them: 'Hi Sarah, this is a reminder that your dental appointment is tomorrow at 2pm. Reply STOP to unsubscribe.'”
Technical details
Endpoint
POSThttps://fastsend.dev/api/v2/messages?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a simple, pay-per-use API to programmatically send either SMS or email messages without managing your own carrier integrations or email infrastructure. It is ideal for agentic workflows that need to notify, alert, or reach users on-demand, especially when cost predictability ($0.165 per message) and dual-channel support (SMS + email) in a single API call matters.
Side effects
- Invalid or unformatted phone number or email address returns a validation error
- Missing required fields (to, from, channel, content) result in a 400 bad request
- Unsupported channel value (not 'sms' or 'email') causes rejection
- Payment not completed (x402 protocol) blocks the request
- Rate limiting or quota exceeded returns a 429 error
- Delivery failure to the recipient's carrier or email provider may result in a non-delivery report
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| from | string | |
| channel | string | |
| content | string | |
| subject | string |
Tags
x402
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