Check any number against a real toll-fraud watchlist — known premium-rate ranges, satellite prefixes, and high-risk country codes — the same data 6X's own internal Fraud Watch uses to protect every wholesale account.
Screen destination numbers before an outbound campaign dials them, catching known toll-fraud ranges before you pay to connect.
Check a number before sending a paid OTP or verification code — never waste a send on a known-risky destination.
Not a separate, lesser dataset — the exact high-risk prefix table 6X's own internal fraud detection uses on every account.
Check any number instantly, no account history needed — a pure destination lookup, not a behavioral score.
Zero marginal cost to serve a watchlist lookup, so it's free for approved wholesale accounts via the API, and free to try here with no login.
The same check is a free endpoint on the 6X API — build it directly into your dialer, OTP flow, or CRM.
Toll fraud (also called IRSF — International Revenue Share Fraud) is when a bad actor tricks a system into calling or texting premium-rate or high-cost international numbers they control, pocketing a share of the inflated termination cost.
Fraud Watch is 6X's own internal system monitoring account-level behavior (volume spikes, off-hours patterns) on live traffic. This API exposes just the destination watchlist piece of it — a stateless check anyone can run against a specific number before dialing or texting it.
Yes — it's a local watchlist lookup with zero marginal cost to serve, so it's free for any approved wholesale account, with no per-call charge.
The API returns which watchlist entry matched and why (e.g. a known premium-rate range or satellite prefix) — the decision to block, allow, or flag it for review is yours to make in your own system.
No — this checks against a known watchlist of high-risk prefixes and ranges, not a live reputation score. A number not on the list simply hasn't matched any known high-risk pattern.
Yes — checking a number here before an OTP or call attempt is exactly the intended use case, catching known-risky destinations before you spend money reaching them.
The same check this page uses is a free endpoint on the 6X API — register a wholesale account and call it directly.
Want the full picture, not just this one lookup? A wholesale account gets Fraud Watch running automatically on all your own traffic, not just numbers you check manually.
Wholesale VoIP →