In one of the cases, it seems likely that either the issuing bank was compromised or the thieves got lucky and randomly guessed the right number (not so hard, actually).
The "reading on the street" only works if you have an RFID card. Go here for a list of ways to find out if your card has that.
In either case, it's not worth worrying about. Credit card payments are the safest you can make (in the US). I almost never pay with anything else, because cash can be stolen and the liabilities for debit transactions are much higher. If your card gets stolen, it's your bank's problem, not yours.
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In one of the cases, it seems likely that either the issuing bank was compromised or the thieves got lucky and randomly guessed the right number (not so hard, actually).
The "reading on the street" only works if you have an RFID card. Go here for a list of ways to find out if your card has that.
In either case, it's not worth worrying about. Credit card payments are the safest you can make (in the US). I almost never pay with anything else, because cash can be stolen and the liabilities for debit transactions are much higher. If your card gets stolen, it's your bank's problem, not yours.