For Monzo card purchases >£1 put 30% of the spare change in a pot. Note this is actually spare change less 70% rather than 30% to avoid rounding errors.
If
Any card purchase above an amount
This trigger fires whenever you spend more than the specified amount with your Monzo card, and the transaction goes through.
Then
Move money into a pot
This action will move money from your main account into a pot of your choice.
Discover more time saving integrations for swok_monzo and Monzo