# StablePhone: Buy a Phone Number

> StablePhone: Buy a Phone Number is a paid API for AI agents from stablephone.dev, paid per call via x402, $20/call, status unknown (last checked 2026-09-13).

Purchase a dedicated phone number for use as an outbound caller ID for AI phone calls

## Facts

- Endpoint: POST https://stablephone.dev/api/number
- Price: $20/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/stablephone-050c3e13
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GypnX6-KVb7ezCQwGTRSg

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability stablephone-050c3e13 -d '<json body>'
```

Example prompt: Buy me a dedicated phone number on StablePhone so I can use it as a caller ID when making AI phone calls — charge it to my wallet.

## When to prefer this

Use this endpoint when an AI agent or user needs a persistent, dedicated phone number to act as a caller ID for outbound AI phone calls on StablePhone. This is the first step before making calls via the Call endpoint — a purchased number is required to appear as a real caller ID. Prefer this over generic VOIP number providers if you are already using StablePhone's AI call infrastructure.

## Known failure modes

- Insufficient USDC balance — payment of $20.00 USDC fails
- x402 payment protocol error — wallet or payment header malformed
- No numbers available in the pool — service may be temporarily out of stock
- Invalid wallet address — purchase cannot be attributed
- Network or provider error — number provisioning fails on backend

## How this service works

Buy a phone number

## Output

Returns a newly provisioned phone number tied to the paying wallet, usable as an outbound caller ID for AI phone calls. The number is valid for a set period (extendable via top-up) and associated with the purchasing wallet address.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "area_code": {
   "type": "string",
   "pattern": "^\\d{3}$"
  },
  "country_code": {
   "enum": [
    "US",
    "CA"
   ],
   "type": "string",
   "default": "US"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/stablephone-050c3e13/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from stablephone.dev](https://www.zero.xyz/host/stablephone.dev/llms.txt)