Factline
Use when you need to check a phone number from any country: valid and possible against allocated ranges, E.164 and national format, country, and line type (mobile, landline, VoIP, toll-free, premium) with an SMS-capable hint. National numbe
Go to this service →Our latest check (2026-10-11)
- Answering
- Yes — valid x402 payment terms
- Time to answer
- 50 ms
- Price
- $0.003 per call
- Paying buyers, last 30 days
- 2 (directory's own records)
- Paid calls, last 30 days
- 4
- Category
- Insurance
- Address
- https://factline.dev/v1/phone/verify
Accuracy
Accuracy scores are published once a seller has enough paid checks against an independent record (at least 7 scored answers over at least 7 days). Until then no score is shown, and a missing score is never a pass.
For agents
This page as JSON: /sellers/705fe28c41b3.json. Paid lookup by address: GET /api/seller?resource=… ($0.001, x402).