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Phone Number Validation & Normalization (libphonenumber)
x402
Phone Number Validation & Normalization (libphonenumber) is a paid API for AI agents from api.aventtech.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-10).
Validates and normalizes international phone numbers using libphonenumber, returning validity, country, E.164 format, national/international formats, and line type.
Price / call$0.01
Success—
StatusUnknown
How this service works
International phone number validation and normalization (libphonenumber): validity, country, E.164, national/international formats and line type.
Output
Returns a structured object including: whether the phone number is valid, the parsed country (ISO code and name), the E.164 canonical form (e.g. +14155550198), the national format, the international format, and the line type (mobile, landline, VoIP, toll-free, etc.).
Example use cases
Clean customer contact data for CRM
“I've got a batch of phone numbers from our sign-up forms with lots of different formats. Can you validate each one, normalize them to E.164, and tell me if any are mobile numbers so we can segment our outreach?”
Verify phone numbers before SMS campaigns
“Before we send out our SMS campaign, I need you to check all these phone numbers are actually valid and tell me which ones are mobile lines versus landlines, since we only want to text mobile users.”
Identify international callers by location
“We're getting calls from all over the world with numbers in different formats. Can you parse these phone numbers and tell me what country each one is from, whether they're real, and what type of line they are?”
Technical details
Endpoint
GEThttps://api.aventtech.com/validate/phone?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need authoritative, library-grade phone number validation backed by Google's libphonenumber — the industry-standard parser trusted by major platforms. Prefer it over regex-only validators when you need line type detection, E.164 normalization, or reliable country identification across international formats.
Side effects
- Missing 'number' query parameter returns a 400 error
- Unparseable or gibberish input returns invalid=true with no country or format data
- Ambiguous national-format number without a 'country' hint may fail to resolve correctly
- Very new or unusual number ranges may not be recognized by the underlying libphonenumber library
- Payment not included or rejected returns a 402 Payment Required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"e164": "+302101234567",
"type": "fixed_line",
"valid": true,
"country": "GR"
}
}Tags
x402
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