The Fee Market

Bitcoin’s security budget — the total compensation miners receive for securing the network — currently consists mostly of block rewards. With each halving, that reward shrinks. The fee market is designed to fill the gap.

The transition is already underway. In 2009, transaction fees were effectively zero. By 2017, during the first major congestion event, fees spiked to tens of dollars per transaction. In 2024, following the halving and the explosion of Ordinals inscriptions onto the blockchain, certain blocks generated more in fees than in block rewards — briefly.

This matters because it demonstrates the fee market functioning as designed. When block space is scarce, users bid up fees to get their transactions included. Miners earn more. The network remains incentivised to secure the blockchain even as the block reward component shrinks.

For the fee market to fully sustain Bitcoin’s security long-term, several things need to be true. Bitcoin transaction volume needs to remain substantial. Block space needs to remain genuinely scarce — either through maintained limits or through second-layer solutions routing high-frequency transactions off-chain while anchoring to the main chain. And the value of Bitcoin itself needs to be high enough that fee revenue in dollar terms remains meaningful.

None of these are guaranteed. But the direction of travel — growing adoption, growing transaction volume, growing fee revenue — has been consistent. And the 2024 Ordinals episode showed that demand for Bitcoin block space can come from unexpected directions, providing fee revenue in ways nobody predicted.

The fee market is a work in progress. So far it’s progressing.

Tomorrow: soft forks and hard forks — how Bitcoin changes its own rules.

— The Daily Bit