Can I cancel a confirmed buy order?

No, unfortunately, you are not able to cancel a confirmed buy trade, all confirmed buys on Coin Rivet are final.

Before any buy trade is processed, you will always receive a ‘Buy order preview’ screen, to ensure you are comfortable with the amount and timing of your order. Only click ‘Buy now’ once you are sure you want the buy order to be processed, as described in the buy order preview confirmation screen.