Crypto glossary
Ultrasound money
Ultrasound money is the Ethereum community thesis that fee burning can make ETH supply shrink over time, positioning it as scarcer than "sound money" bitcoin.
The phrase plays on "sound money", a label Bitcoin supporters use for BTC's fixed supply. Ethereum researchers and fans argued that ETH could go further: since EIP-1559 burns the base fee of every transaction and the Merge in 2022 cut new issuance sharply by moving to proof of stake, heavy network use could destroy more ETH than validators receive, making the supply net deflationary.
For a while after the Merge that is what happened, and dashboards tracking supply became a fixture of Ethereum debates. The picture changed after the Dencun upgrade of March 2024: rollups moved their data to cheap blobs, mainnet fees fell and so did the amount burned, and ETH supply turned inflationary again. Critics used this to argue the thesis had failed; supporters replied that the burn still scales with demand.
Ultrasound money is a narrative, not a protocol rule. ETH has no supply cap, and whether supply grows or shrinks depends on fee demand and the amount staked. Treating the meme as a guarantee of scarcity misreads how the mechanism works.
Example
In a weekly market report, an analyst notes that ETH supply grew again over the quarter and that the "ultrasound money" narrative has lost force since fees moved to blobs.