Hello, there is one dude who keep doing
Hello, there is one dude who keep doing the same input like hundred times a day and make me lose money is there a way to block him? Pretty sure its a bot or malicious user

Push at least one "error item" to the dataset as you can read in the docs: https://docs.apify.com/platform/actors/publishing/monetize/pay-per-result#push-at-least-one-error-item-to-the-dataset.Push at least one "error item" to the dataset