A fee expressed per unit of transaction size (e.g., satoshis per vbyte) used to prioritize inclusion in blocks.
Miners select transactions by highest fee rate to maximize revenue. Wallets estimate the minimum sat/vB necessary for a target confirmation window.
When demand spikes, required fee rates rise; on BCH or during quiet periods, the minimum relay fee often suffices.
Fee = fee rate × virtual size. Users can lower fees by reducing input count or using efficient scripts; batch payments improve amortized fee rate.
A 200 vbyte transaction at 2 sat/vB costs 400 sats; consolidating inputs during low-fee times reduces future costs.
All terms and definitions may update as the Cryptionary improves.