Fraud prevention
IRSF: international revenue share fraud, explained
How international revenue share fraud turns your calls and texts into someone else's income, how it differs from SMS pumping, and how to cap your exposure.
7 min read
Articles tagged “OTP”
6 articles.
Fraud prevention
OTP fraud prevention: the checks to run before you send a code
A practical pre-send pipeline for one-time passcodes: normalize, check line type, messenger presence and reputation in one request, then decide.
8 min read
Fraud prevention
SIM swap fraud: the signals to check before you trust an SMS code
What a SIM swap is, which SIM-swap data exists and who can get it, and which signals to combine before you trust an SMS code when that data is missing.
9 min read
Fraud prevention
SMS pumping: how it works and how to stop it
How SMS pumping (artificially inflated traffic) drains OTP budgets, the signals that give it away, and a layered checklist to stop it before you pay.
8 min read
Deliverability
WhatsApp OTP vs SMS OTP: cost per verified user, with a calculator
WhatsApp authentication rates vs SMS prices by country, the October 2026 changes, and a calculator for cost per verified user including SMS fallback.
7 min read
Deliverability
Why SMS messages aren't delivered: a cause tree with fixes
A cause tree for undelivered SMS: invalid numbers, unreachable phones, wrong line types, carrier filtering and handsets, with a fix for each.
7 min read
