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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 2026-09-14).
Send an SMS text message or email to a recipient via the Fastsend 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 SMS or email message was successfully dispatched by Fastsend, typically including delivery status or a message ID.
Example use cases
Order shipment SMS alert
“Send a text message to +12125550199 from +18005550100 letting them know their order #4821 has shipped and will arrive by Friday.”
Transactional email with subject
“Send an email to jane.doe@example.com from noreply@myapp.com with the subject 'Password Reset Request' and the body 'Click here to reset your password: https://myapp.com/reset/abc123'.”
Agent-triggered user notification
“Alert user at +14155550172 via SMS from +18005550100 that their appointment is confirmed for tomorrow at 3pm — just a short text saying 'Your appointment is confirmed for tomorrow at 3:00 PM. See you then!'”
Technical details
Endpoint
POSThttps://fastsend.dev/api/messagesWhen to prefer
Choose this endpoint when an AI agent needs to programmatically send a single SMS or email notification and can pay per-message in USDC via the x402 protocol. It is well-suited for transactional alerts, confirmations, or one-off notifications where no existing messaging infrastructure is in place. Prefer this over higher-volume bulk messaging services when simplicity and per-call billing are acceptable.
Side effects
- Invalid or unformatted phone number for SMS channel
- Invalid email address format
- Missing required fields (to, from, channel, content)
- Insufficient USDC balance to cover $0.165 per-call cost
- Unsupported channel value (not 'sms' or 'email')
- Missing subject field when channel is email
- Payment failure via x402 protocol
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| from | string | |
| channel | string | |
| content | string | |
| subject | string |
Tags
x402
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