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Contact Verify – Phone Line-Type Lookup
x402
Contact Verify – Phone Line-Type Lookup is a paid API for AI agents from verify-x402.okwithit9.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-22).
Performs a live carrier lookup to determine if a phone number is mobile, landline, VoIP, or toll-free, with E.164 normalization and carrier metadata.
Price / call$0.02
Success—
StatusUnknown
How this service works
Pay-per-call email and phone verification for AI agents. Real mailbox-level email verification (SMTP-level deliverability, catch-all, disposable, and role detection). Live carrier line-type lookup (mobile, landline, VoIP, toll-free) with E.164 normalization. No signup and no API key. Payment is USDC on Base via x402 exact. Email addresses and phone numbers are not stored. Paid routes return HTTP 402 until the client sends a valid x402 PAYMENT-SIGNATURE. USDC uses 6 decimals.
Output
Returns a JSON object containing: a boolean validity flag, the E.164 normalized phone number, national format, calling country code, ISO country code, and a line_type object with the line category (mobile/landline/VoIP/toll-free), carrier name, mobile country code (MCC), and mobile network code (MNC).
Example use cases
SMS deliverability pre-check
“Before we send that marketing SMS blast, check if the number +447911123456 is actually a mobile line or if it's a landline — I don't want to waste sends.”
Fraud detection for new signups
“A user just signed up with the phone number 2125551234 in the US — can you tell me if it's a real mobile line or a VoIP number? I want to flag suspicious registrations.”
Normalize and classify international number
“I have a UK phone number — 07700900123 — can you convert it to E.164 format and tell me whether it's mobile, landline, or toll-free, and which carrier it's on?”
Technical details
Endpoint
POSThttps://verify-x402.okwithit9.workers.dev/verify/phone?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need live, real-time carrier line-type data (mobile vs landline vs VoIP vs toll-free) with E.164 normalization in a single call. Ideal for fraud detection pipelines, SMS deliverability pre-screening, and contact data enrichment where knowing the line type and carrier is essential. Prefer this over static database lookups when accuracy and recency matter, and when you also need proper phone number formatting as a side benefit.
Side effects
- Invalid or unrecognized phone number returns valid:false with no carrier data
- Missing country parameter when a non-E.164 national number is provided may cause parse failure
- Carrier lookup may return null carrier_name for unallocated or very new numbers
- Rate limiting or payment failure (402) if USDC balance is insufficient
- Malformed phone string (letters, special chars) may return an error response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"valid": true,
"line_type": {
"type": "mobile",
"error_code": null,
"carrier_name": "Example Carrier",
"mobile_country_code": "310",
"mobile_network_code": "260"
},
"country_code": "US",
"phone_number": "+14155552671",
"national_format": "(415) 555-2671",
"calling_country_code": "1"
}
}Tags
x402
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