# AISkills402 Phone E.164 Normalize Skill File

> AISkills402 Phone E.164 Normalize Skill File is a paid API for AI agents from api.aiskills402.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-18).

Purchases and downloads a tested SKILL.md file that teaches an AI agent how to normalize phone numbers to E.164 format, paid once in USDC via x402.

## Facts

- Endpoint: GET https://api.aiskills402.com/v1/skills/phone-e164-normalize/file?utm_source=zero.xyz
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/aiskills402-phone-e-164-normalize-skill-file-12f319f1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6AxGWzEQNb2dxUS4LVtp5

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 aiskills402-phone-e-164-normalize-skill-file-12f319f1
```

Example prompt: Buy me the phone E.164 normalization SKILL.md from AISkills402 so I can use it to standardize phone numbers in my workflow — pay the $0.03 USDC fee and give me the file content and my redownload token.

## When to prefer this

Choose this endpoint when you need a tested, ready-to-use SKILL.md instruction file specifically for E.164 phone number normalization, and want a one-time purchase model with free re-downloads and version updates, paid in USDC via x402 micropayment on Base. Prefer this over writing custom normalization logic from scratch when you want a curated, agent-ready skill definition.

## Known failure modes

- Payment not received or insufficient USDC balance — x402 payment required before file is delivered
- Invalid or missing HTTP method — endpoint accepts only GET or HEAD
- Network or blockchain settlement failure — receipt may show settled:false
- SHA256 mismatch on re-download — file integrity check fails
- Redownload token expired or invalid — unable to retrieve previously purchased skill

## How this service works

Phone Numbers to E.164 — Turns a list of phone numbers written any way people write them into E.164 (a plus sign, the country code and the national number, digits only), one JSON object per number, using a default country the request states. Where plain models slip - the trunk 0 left in, "+44 (0)20" glued to a stray zero, Italian numbers with the leading 0 wrongly dropped, the leading 1 of a North American number kept, a made-up country for a bare local number, an extension stuck onto the numbe…

## Output

Returns a JSON object containing the SKILL.md file name, full UTF-8 file content (instructions for normalizing phone numbers to E.164), the skill identifier ('phone-e164-normalize'), a SHA256 checksum of the file, a payment receipt with the settlement transaction hash, the skill version (e.g. 1.0.0), and a redownload URL and token for future free re-downloads.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD"
     ],
     "type": "string"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "file": {
   "name": "SKILL.md",
   "content": "<the SKILL.md file>",
   "encoding": "utf-8"
  },
  "name": "Phone Numbers to E.164",
  "skill": "phone-e164-normalize",
  "sha256": "<sha256 of SKILL.md>",
  "receipt": {
   "tx": "0x<settlement transaction>",
   "settled": true
  },
  "version": "1.0.0",
  "redownload": {
   "url": "<api>/v1/purchases/<token>",
   "token": "<64 hex chars>"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/aiskills402-phone-e-164-normalize-skill-file-12f319f1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.aiskills402.com](https://www.zero.xyz/host/api.aiskills402.com/llms.txt)