Do Kaspa transaction fees go up when the network is busy?

Yes — Kaspa has a fee market that raises fees when the network is congested. Under normal conditions fees are extremely low, but when many users are submitting transactions at the same time, the fee market kicks in and miners prioritize transactions that offer a higher fee. This means that during peak congestion you may need to pay more to get your transaction confirmed quickly, or you can wait for traffic to ease and pay the standard low fee. Knowing this helps you decide whether to send immediately during a busy period or hold off until the network quiets down.