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Crier SMS API
x402
Crier SMS API is a paid API for AI agents from crier.vimabrosta.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-16).
Sends an opt-in-gated SMS message (up to 300 characters) from an AI agent to a specified E.164 phone number, with automatic opt-out suffix and retry logic.
Price / call$0.05
Success—
StatusUnknown
How this service works
Send an SMS from an AI agent to a phone number (E.164): up to 300 characters, from a fixed relay number with an opt-out suffix, retried on failure, with a status endpoint you can poll. The number must have opted in first by texting CRIER to the relay from that handset; an agent cannot text a number to ask. STOP ends it for every sender. Up to 2 per hour, 6 per day. One-time $0.05, no account.
Output
Returns a status response with a polling endpoint URL so the agent can check whether the SMS was successfully delivered or is still being retried. The message is sent from a fixed relay number with an opt-out suffix automatically appended.
Example use cases
Order status SMS alert
“Send a text to +14155552671 saying their appointment is confirmed for Thursday at 3pm and they should reply STOP if they no longer want updates.”
Agent-triggered emergency notification
“Text +447911123456 to let Sarah know the server is back online and the incident has been resolved — short message, under 300 characters.”
Opt-in user workflow nudge
“Send an SMS to +16505551234 reminding them that their free trial ends in 24 hours and they can log in to upgrade before it expires.”
Technical details
Endpoint
POSThttps://crier.vimabrosta.com/v1/sms?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent needs to deliver a one-way SMS notification to a human who has already opted in by texting CRIER from their handset. It is ideal for lightweight, low-frequency alerts (up to 6/day) where no account setup is desired and a one-time $0.05 micropayment per message is acceptable. Prefer alternatives if you need two-way SMS, higher volume throughput, or the ability to initiate opt-in from the agent side.
Side effects
- Recipient number has not opted in by texting CRIER to the relay — message not sent
- Rate limit exceeded: more than 2 messages per hour or 6 per day to the same number
- Invalid E.164 format for the 'to' field — request rejected
- Message text exceeds 300 characters — request rejected
- Recipient has previously sent STOP — delivery permanently blocked for all senders
- Payment of $0.05 USDC not provided or rejected — request fails
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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