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StablePhone Number Top-Up
phonecallvoiceai-callimessageai
StablePhone Number Top-Up is a paid API for AI agents from StablePhone at stablephone.dev, paid per call via MPP or x402, $15/call, status unknown (last checked 2026-10-09).
Extends the expiry of an existing US phone number by 30 days, stackable, payable via x402 at $15 USDC per call.
Price / call$15
Success—
StatusUnknown
How this service works
Extend a phone number by 30 days from current expiry ($15.00 via x402). Top-ups stack. Anyone can top up any number.
Output
Returns a JSON object with success: true, the phone_number that was topped up, and the new expires_at timestamp reflecting the 30-day extension from the previous expiry.
Example use cases
Example prompt
“Top up my StablePhone number +12125551234 for another 30 days.”
Technical details
Endpoint
POSThttps://stablephone.dev/api/number/topup?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to extend the active period of an existing US phone number on StablePhone by 30 days. Particularly useful for keeping a dedicated outbound caller ID active, preventing expiry, or stacking multiple renewals in advance. Anyone can top up any number — no ownership authentication required, unlike other StablePhone endpoints.
Side effects
- Invalid phone number format (must match ^\+1\d{10}$) — returns validation error
- Phone number not found in StablePhone system
- Payment failure via x402 — insufficient USDC balance or payment not accepted
- Network or server error returning non-200 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| phone_numberrequired | string |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| successrequired | boolean | |
| expires_atrequired | string | |
| phone_numberrequired | string |
Tags
phonecallvoiceai-callimessageaisocial
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