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klymax402 SMS Validator — Phone Number Validation API
x402
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.
Price / call$0.005
Success—
StatusUnknown
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.
Example use cases
OTP delivery pre-check
“Before I send a one-time password, can you validate that +33612345678 is a real mobile number that can receive SMS? I want to make sure it's SMS capable before wasting credits.”
User registration form validation
“A user just signed up with the phone number +447911123456 and country code GB — can you verify it's a valid number and tell me what type it is?”
International number normalization
“I have a phone number entered as 06 12 34 56 78 from France — can you normalize it to E.164 format and confirm it's a valid SMS-capable mobile number?”
Technical details
Endpoint
GEThttps://klymax402.com/api/sms-validator/api/validateWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| phone | string | Phone number with country code (e.g. +14155551234) |
| countryCode | string | ISO 3166-1 alpha-2 country code hint (e.g. US, FR, GB) |
Output
Schema · Response
{
"type": "json",
"example": {
"e164": "example",
"phone": "example",
"valid": true,
"country": {},
"numberType": "example",
"smsCapable": true,
"nationalNumber": "example"
}
}Tags
x402
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