I have my Chase cards set up to email alerts for:
1. More than ($ USD) is authorized on my credit card for a single transaction
2. An international charge is authorized on my credit card
3. An online, phone or mail charge is authorized on my credit card
4. A gas station charge is authorized on my credit card
The only $1 charges I ever got an email for was from ticket purchases on united.com.
When I purchase at a gas station, the email usually hits my phone within 1 minute, and often before I start the car and drive away. I've never seen a $1 charge from a gas station from my personal use.
Over the past years, my Chase card has been "duplicated" 3 or 4 times. With the alerts set up this way, last time I was able to notify chase and cancel the card within minutes of the first fraudulent use.