Link:
Most times no Otp
Gucci.com
Groupon.com
Nike the app
Amazon.com
You can do debit card transaction without an OTP on international websites. You only need debit card number, Expiry date and CVV. Even you don't need PIN
More apps without Otp
Nearbuy
Grofers
Clovia
MakeMyTrip
Lenskart
Pepperfry
Dominos