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code402 E.164 Phone Number Validator
x402
code402 E.164 Phone Number Validator is a paid API for AI agents from hcrb.in, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-12).
Validates E.164-formatted international phone numbers offline and deterministically, returning validity, reason, country, and normalized form
Price / call$0.005
Success—
StatusUnknown
How this service works
Offline deterministic checks (no ML, no scraping) for business identifiers and rental due-diligence, paid per call via x402 (gasless EIP-3009 USDC on Base). Checksum-verifiable (IBAN, LEI, VAT, ABA, ISBN, SEDOL…) vs format-only (EIN, IFSC, SWIFT/BIC…) — every response returns a scope field. Non-custodial, signed receipts. First 3 calls/day free.
Output
Returns a JSON object with: valid (boolean indicating whether the number passes E.164 validation), reason (human-readable explanation of the result), scope (indicates whether validation is checksum-based or format-only), country (ISO country code inferred from the number), normalized (canonical E.164 representation of the number), and tool (identifier for the tool used).
Example use cases
Phone number cleanup before SMS campaign
“I have a list of customer phone numbers and I need to check if +447911123456 is a properly formatted E.164 number before I send out an SMS blast — can you validate it and tell me what country it's from?”
User registration input validation
“A user just entered +861012345678 as their phone number during signup — is that a valid E.164 number, and what country does it belong to?”
CRM data quality audit
“I'm auditing our CRM and need to check if +33612345678 is a valid international phone number in E.164 format — give me the validation result and the normalized form.”
Technical details
Endpoint
POSThttps://hcrb.in/v1/tools/e164-check/call?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need fast, offline, deterministic phone number validation with no ML or external lookups — ideal for data pipelines, form validation, and CRM cleanup where privacy and consistency matter. Prefer it over live telecom APIs when you don't need to verify whether a number is actually active or reachable, only that it's correctly structured.
Side effects
- Malformed or missing phone number input returns valid: false with a reason explaining the format issue
- Numbers with valid format but unassigned country codes may return valid: false
- Non-E.164 strings (e.g. national formats without +) may fail format checks
- Rate limit exceeded beyond 3 free daily calls without payment results in HTTP 402
- Network connectivity issues may prevent reaching the endpoint
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | object |
Output
Schema · Response
{
"type": "json",
"schema": {
"type": "object",
"required": [
"valid",
"reason"
],
"properties": {
"tool": {
"type": "string"
},
"scope": {
"type": "string"
},
"valid": {
"type": "boolean"
},
"reason": {
"type": "string"
},
"country": {
"type": "string"
},
"normalized": {
"type": "string"
}
}
},
"example": {
"valid": true,
"reason": "checksum valid"
}
}Tags
x402
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