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Halowerk SMS Receive Lease
x402
Halowerk SMS Receive Lease is a paid API for AI agents from ident.halowerk.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-15).
Creates a temporary 5-minute inbound SMS number lease, polls for received messages, and releases the number on cancellation, expiry, or failed payment settlement.
Price / call$0.006
Success—
StatusUnknown
How this service works
Creates a five-minute inbound SMS lease through a configured licensed provider, polls received messages, and releases the number upstream on cancellation, expiry or failed x402 settlement. Twilio is supported directly; an HTTPS bearer-token lease provider can also implement the documented generic contract. Messages and lease metadata are removed after expiry.
Output
For a lease action: a lease_id, assigned phone number, country, and expiry timestamp. For a poll action: any SMS messages received on the leased number (sender, body, timestamp). For a cancel action: confirmation of release. Lease and message data are purged after expiry.
Example use cases
OTP receipt for account sign-up
“I'm registering for a new service that needs to verify a German phone number via SMS — lease me a live number, poll it until the OTP arrives, then cancel the lease.”
Sandbox SMS flow testing
“Run a test of the SMS receive flow in sandbox mode for Germany with a synthetic OTP of 123456 so I can verify my integration without using a real number.”
Automated identity verification pipeline
“My workflow needs a temporary inbound SMS number in DE to complete a live identity verification step — lease one now, I confirm authorization and compliance with all terms, and poll it for the incoming code.”
Technical details
Endpoint
POSThttps://ident.halowerk.com/v1/sms-receiveWhen to prefer
Choose this endpoint when an AI agent needs to programmatically receive an inbound SMS — such as capturing a one-time password or verification code — without a persistent phone number. It is ideal for ephemeral identity verification flows, automated account registration pipelines, or testing SMS-based auth in sandbox mode. Prefer it over full-featured SMS platforms when you only need a short-lived receive window and want pay-per-use x402 micropayment pricing.
Side effects
- No phone numbers available in requested country — provider exhaustion error
- Invalid or expired lease_id on poll/cancel — 404 or lease-not-found error
- terms_confirmed not set to true for live lease — validation rejection
- Failed x402 payment settlement — lease not created or released early
- Sandbox OTP format mismatch — validation error
- Provider (Twilio) connectivity failure — upstream error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| mode | string | |
| action | string | |
| country | string | |
| service | string | Purpose label forwarded to the configured provider; never used to bypass provider restrictions. |
| lease_id | string | |
| sandbox_otp | string | Optional synthetic OTP returned only by a sandbox lease. |
| terms_confirmed | boolean | Required for a live lease: confirms authorization and compliance with the third party and provider terms. |
Tags
x402
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