# 402utils Phone Number Validator

> 402utils Phone Number Validator is a paid API for AI agents from 402utils.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-13).

Validates and normalizes a phone number using Google libphonenumber, returning E.164/international/national formats, country detection, and line type classification

## Facts

- Endpoint: GET https://402utils.com/v1/phone-check
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/402utils-phone-number-validator-3d0370d1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rJFI9T5zMZzMlPT2_3I9M

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 402utils-phone-number-validator-3d0370d1
```

Example prompt: Can you validate the phone number +33612345678 for me — check if it's a real number, what country it belongs to, and whether it's a mobile or landline?

## When to prefer this

Use this endpoint when you need strict national-plan-level phone validation (not just length heuristics), E.164 normalization, country detection across shared codes (+1, +44), or line-type classification. Prefer over regex-based validators when accuracy matters. Use the ?attest=1 option when you need a cryptographically signed audit trail of the validation result.

## Known failure modes

- Phone number is unparseable — returns valid:false with no e164/country fields
- Country code provided doesn't match number format — may return valid:false
- Shared country codes like +1 may return undetermined country when number is ambiguous
- Network or service error returns a non-200 HTTP status
- attest=1 requested but key unavailable — attestation object absent or error

## How this service works

Validate and normalize a phone number with full Google libphonenumber metadata: strict validity against each national numbering plan, E.164 / international / national formats, country detection (correct across shared codes like +1 and +44) and line type (mobile, fixed_line, toll_free, voip…) where the plan distinguishes it. Pass ?country=FR to parse national formats. Local. ?attest=1 → Ed25519-signed.

## Output

A JSON object with: valid (strict boolean per national numbering plan), possible (looser length-plausibility boolean), e164 (normalized E.164 string), national (national format string), country (ISO alpha-2), and type (mobile, fixed_line, toll_free, voip, etc. where the plan distinguishes). Optionally, an attestation object with an Ed25519 signature over the canonical result for audit trail purposes.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "phone"
     ],
     "properties": {
      "phone": {
       "type": "string",
       "description": "The number, E.164 (+33612345678) or national."
      },
      "attest": {
       "type": "string",
       "description": "Set to 1 for an Ed25519-signed attestation of the result (audit trail)."
      },
      "country": {
       "type": "string",
       "description": "ISO alpha-2 default country for national input."
      }
     },
     "description": "Query params. `phone` required; `country` helps parse national formats."
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "valid"
     ],
     "properties": {
      "e164": {
       "type": "string"
      },
      "type": {
       "type": "string",
       "description": "mobile | fixed_line | fixed_line_or_mobile | toll_free | premium_rate | voip | … — absent when the plan does not distinguish."
      },
      "valid": {
       "type": "boolean",
       "description": "Strict validity per the national numbering plan."
      },
      "country": {
       "type": "string",
       "description": "Detected ISO alpha-2; absent when undeterminable."
      },
      "national": {
       "type": "string"
      },
      "possible": {
       "type": "boolean",
       "description": "Length-plausibility (looser than valid)."
      },
      "attestation": {
       "type": "object",
       "properties": {
        "alg": {
         "type": "string",
         "const": "Ed25519"
        },
        "sig": {
         "type": "string",
         "description": "base64url Ed25519 signature over the canonical JSON of payload."
        },
        "payload": {
         "type": "object",
         "properties": {
          "ts": {
           "type": "string",
           "format": "date-time"
          },
          "kid": {
           "type": "string",
           "description": "Key id — matches a key in the
… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "e164": "+442079460958",
  "type": "fixed_line",
  "valid": true,
  "country": "GB",
  "national": "020 7946 0958",
  "possible": true,
  "international": "+44 20 7946 0958"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/402utils-phone-number-validator-3d0370d1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 402utils.com](https://www.zero.xyz/host/402utils.com/llms.txt)