# Agent402 UK Phone Number E.164 Validator

> Agent402 UK Phone Number E.164 Validator is a paid API for AI agents from agent402.co.uk, paid per call via x402, $0.001/call, status down (last checked 2026-09-15).

Validates a phone number against E.164 format rules without performing any carrier or network lookup

## Facts

- Endpoint: POST https://agent402.co.uk/v1/validate/phone
- Price: $0.001/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent402-uk-phone-number-e-164-validator-6963d3dd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2NVUjheRMfZ6PGdT9Vu8A

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 agent402-uk-phone-number-e-164-validator-6963d3dd -d '<json body>'
```

Example prompt: Check whether +447911123456 is a valid E.164-format phone number — just the format check, no carrier lookup needed.

## When to prefer this

Use this endpoint when you need a fast, cheap, format-only check that a phone number is E.164-compliant before storing or passing it downstream — ideal for form validation pipelines, data ingestion, and pre-send checks where carrier or network reachability is irrelevant and cost matters at scale.

## Known failure modes

- Phone number missing '+' prefix returns invalid
- Non-numeric characters cause format failure
- Number too short or too long for E.164 spec returns invalid
- Missing or empty phone field returns a validation error
- Malformed JSON body returns 400 error

## How this service works

Don't burn tokens on deterministic work. Go/no-go jobs first: payout preflight, text firewall (PII/secrets), budget check — then rails, calendars, finmath. x402 USDC on Base. UK + global. agent402.co.uk — not agent402.tools. $0.001–$0.002 USDC on Base. No API keys.

## Output

A validation result indicating whether the submitted phone number string conforms to E.164 international format (e.g. starts with '+' followed by country code and subscriber number, correct length). No carrier, network, or reachability data is returned.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "phone": {
   "type": "string",
   "description": "Phone number"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "country_code": "44",
  "valid_e164_format": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent402-uk-phone-number-e-164-validator-6963d3dd/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent402.co.uk](https://www.zero.xyz/host/agent402.co.uk/llms.txt)