# klymax402 SMS Validator — Phone Number Validation API

> klymax402 SMS Validator — Phone Number Validation API is a paid API for AI agents from klymax402.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Validates a phone number, checks its SMS capability, determines its type, and returns normalized E.164 format along with country metadata.

## Facts

- Endpoint: GET https://klymax402.com/api/sms-validator/api/validate
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/klymax402-sms-validator-phone-number-validation-api-773d2e20
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XxLA4grr9mwFkQYAbc4YB

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 klymax402-sms-validator-phone-number-validation-api-773d2e20
```

Example prompt: Can you check whether +14155551234 is a valid phone number, confirm it can receive SMS messages, and tell me its type and country?

## When to prefer this

Choose this endpoint when you need to verify, normalize, and enrich a phone number — especially to confirm SMS deliverability before sending messages or OTPs. It is ideal for pre-validating user-submitted phone numbers in registration flows, cleaning up phone number datasets, or routing logic that depends on number type (mobile vs. landline). Prefer it over a pure format-checker when you need both structural validation and SMS capability confirmation in a single call.

## Known failure modes

- Invalid or unparseable phone number format returns valid: false with no normalized output
- Missing or incorrect country code hint may cause misclassification of ambiguous numbers
- Unsupported country or number range may yield incomplete country metadata
- Malformed input (non-numeric characters, missing '+') may result in a parsing error or invalid response
- Rate limits or payment failure (insufficient USDC) may return a 402 Payment Required error

## How this service works

One MCP endpoint gives your AI agent access to 100 APIs -- crypto, DeFi, web, AI, finance and utilities. No API keys, USDC on Base from $0.003/call.

## Output

A JSON object containing the E.164-normalized phone number, the national number, a boolean validity flag, a boolean SMS capability flag, the number type (e.g. mobile, landline, VoIP), and a country metadata object with details about the number's origin country.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "phone": {
   "type": "string",
   "description": "Phone number with country code (e.g. +14155551234)"
  },
  "countryCode": {
   "type": "string",
   "description": "ISO 3166-1 alpha-2 country code hint (e.g. US, FR, GB)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "e164": "example",
  "phone": "example",
  "valid": true,
  "country": {},
  "numberType": "example",
  "smsCapable": true,
  "nationalNumber": "example"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/klymax402-sms-validator-phone-number-validation-api-773d2e20/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from klymax402.com](https://www.zero.xyz/host/klymax402.com/llms.txt)