What’s the pending €1/£1/$1 in my expenses?

An amount of €1/£1/$1 is usually related to a merchant's attempt to verify the validity of your payment card. When making a payment, a temporary authorization is put on your card, for a nominal amount. Merchants use this to confirm that your payment account is active and has the funds available for purchases. Authorization holds should expire after a short time, just like all other transaction attempts.