Ethereum's switch to proof-of-stake (PoS) on Sept. 15 failed to extend Ether's (ETH) upside momentum as ETH miners added sell pressure to the market. 

On the daily chart, ETH price declined from around $1,650 on Sept. 15 to around $1,350 on Sept. 20, an almost 16% drop. The ETH/USD pair dropped in sync with other top cryptocurrencies, including Bitcoin (BTC), amid worries about higher Federal Reserve rate hikes.

ETH/USD daily price chart. Source: TradingView

Ethereum remains inflationary

The Ether price drop on Sept. 15 also coincided with an increase in ETH supply, albeit not immediately post-Merge. 

Roughly 24 hours later, the supply change flipped positive once more, pouring cold water on the "ultra sound money" narrative due to a deflationary environment that some proponents expected post-Merge. 

Pre-Merge, Ethereum distributed around 13,000 ETH per day to its proof-of-stake (PoW) miners and about 1,600 ETH to its PoS validators. But the rewards to miners dropped after the Merge went live by roughly 90%.