How does Kaspa prevent spam transactions through fees?

Kaspa nodes filter out transactions that carry fees below a set minimum, acting as an anti-spam gate. A node is a computer participating in the Kaspa network that relays and validates transactions; each node enforces a minimum fee rule before it will forward a transaction to its peers. Any transaction whose attached fee is too low gets silently dropped at this gate and never propagates through the network. Node operators can adjust that minimum fee threshold via the command line. For a beginner, the takeaway is that attaching too small a fee is not just slow — the transaction will be outright rejected before it travels anywhere.