Definition. Tips, also known as priority fees, are fees paid by users on Ethereum to expedite their transactions, rewarding validators for prioritizing them. This metric captures the supplementary income received by validators beyond the base fee for ensuring timely transaction processing.

Technical. Priority fees were introduced as part of the London Hard Fork via the Ethereum Improvement Proposal (EIP-1559). Before the Paris upgrade, miners received these tips, but with the transition to Proof-of-Stake, validators now benefit from these additional fees.