What is the purpose of Kaspa's minimum relay fee?

Kaspa's minimum relay fee is an anti-spam measure, not a mining policy — it stops the network from being flooded with junk transactions, but it does not control which transactions miners choose to include in a block. Every Kaspa node sets this threshold: a transaction must meet it before the node will accept it into its mempool and forward it to other nodes. Because submitting a transaction costs at least this small fee, it becomes expensive to spam the network with a massive volume of worthless transactions. The takeaway for beginners is that this fee keeps the network healthy, but a separate, market-driven fee level determines how quickly miners actually confirm your transaction.