# SMS Validator API

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

Validates whether a given phone number is capable of receiving SMS messages

## Facts

- Endpoint: GET https://sms-validator.api.klymax402.com/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/sms-validator-api-e7647c58
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_oyB9KlPkGEVwna36FdTRz

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 sms-validator-api-e7647c58
```

Example prompt: Before I send the onboarding text, can you check if +14155551234 is actually capable of receiving SMS messages — it's a US number?

## When to prefer this

Use this endpoint when you need to verify SMS deliverability before sending text messages, building a user database with phone contacts, or filtering out landlines and non-SMS-capable numbers from a contact list. Ideal for pre-send validation in messaging workflows to reduce bounce rates.

## Known failure modes

- Invalid phone number format returns an error
- Missing country code may produce ambiguous results for numbers without a clear prefix
- Unsupported country or region may return unknown/unresolvable status
- Rate limiting or quota exceeded returns 429 error
- Malformed request with non-E.164 phone number format fails validation

## How this service works

Validate if a phone number can receive SMS

## Output

A validation response indicating whether the provided phone number can receive SMS messages, likely including a boolean result indicating deliverability capability and possibly metadata about the number type (mobile vs landline) or carrier information.

## 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)"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sms-validator-api-e7647c58/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from sms-validator.api.klymax402.com](https://www.zero.xyz/host/sms-validator.api.klymax402.com/llms.txt)