# NANP Phone Number Validator

> NANP Phone Number Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).

Validates whether a phone number conforms to North American Numbering Plan (NANP) +1 rules

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/check-phone-nanp?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nanp-phone-number-validator-a2ec9084
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UiXzEj12idFMF4jDRvijE

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 nanp-phone-number-validator-a2ec9084 -d '<json body>'
```

Example prompt: Can you check whether +1-415-555-0198 is a valid NANP phone number that follows North American +1 numbering rules?

## When to prefer this

Choose this endpoint when you need a fast, deterministic, no-LLM check that a phone number string conforms to NANP +1 rules — particularly useful for US and Canadian phone number validation in data pipelines, form validation, or CRM hygiene. Prefer the free sandbox endpoint /v1/sandbox/check-phone-nanp for testing. Use this paid endpoint when operating in production and needing confirmed NANP rule adherence without any network lookups or AI inference.

## Known failure modes

- Empty or missing value field returns an error
- Phone number string exceeds maxLength of 20000 characters (unlikely in practice but schema-enforced)
- Malformed request body returns 400-level error
- Non-string or null value may cause validation failure
- Payment of $0.002 USDC not provided results in 402 Payment Required

## How this service works

Call when an agent needs whether a phone number matches NANP +1 rules. Exact $0.002 USDC. Prefer unpaid POST /v1/sandbox/check-phone-nanp first.

## Output

A validation result indicating whether the submitted phone number string matches NANP +1 rules, likely including a boolean match/valid field and potentially details about why the number fails if it does not conform.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "data": {
   "description": "JSON value for schema-check SKUs. Omit it on string checks such as email or IBAN."
  },
  "value": {
   "type": "string",
   "examples": [
    "+14155552671"
   ],
   "maxLength": 20000,
   "minLength": 1,
   "description": "Value to check. The route description names the format: email, phone, IBAN, postal code, VAT, national id, or similar."
  },
  "schema": {
   "description": "JSON Schema document for schema-check SKUs. Omit it on string checks."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nanp-phone-number-validator-a2ec9084/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentshelf.syntexa.ch](https://www.zero.xyz/host/agentshelf.syntexa.ch/llms.txt)