Ether’s post-Merge selloff deepened as bitcoin fell below $20,000

Bitcoin fell below $20,000 on September 18, 2022, while ether extended a substantially steeper retreat only three days after Ethereum completed the Merge. The combined move showed that a technically successful network upgrade could not separate crypto-asset prices from the tightening financial conditions dominating global markets.

A Reuters market dispatch published at 12:20 UTC reported bitcoin at $19,804, down 1.54% from its previous close, and ether at $1,422.10, down 3.2%. The figures were point-in-time observations rather than consolidated daily closing prices, an important distinction in a market that trades continuously across venues.

The Block recorded a comparable but slightly later Coinbase-based snapshot: bitcoin at $19,832 and ether at $1,418. Its seven-day measurement put bitcoin down 8.49% and ether down more than 20%. Those percentages belonged to that publication’s observation window and should not be treated as universal returns across every exchange.

A deeper decline by the end-of-date snapshot

CoinMarketCap’s historical snapshot for September 18 listed bitcoin at $19,419.51, down 3.52% over 24 hours and 10.79% over seven days. Ether was listed at $1,335.33, down 9.15% over 24 hours and 24.21% over seven days.

That dataset also placed bitcoin’s market capitalization at approximately $371.97 billion and ether’s at approximately $163.48 billion. Those market-cap values were calculated by the provider from its displayed prices and circulating-supply estimates; they were not audited balance-sheet measurements. The snapshot page does not expose a venue-specific closing auction or a precise observation timestamp, so its figures are best read as a dated aggregate snapshot, not an official close.

The broader comparison is nevertheless clear across the surviving records: both leading assets were under pressure on September 18, and ether had fallen materially faster than bitcoin over the preceding week.

The Merge removed technical risk, not market risk

Ethereum’s Merge had shifted the network from proof-of-work to proof-of-stake on September 15. The Ethereum Foundation’s pre-event documentation explained that the transition would occur when the execution layer reached a Terminal Total Difficulty of 58,750,000,000,000,000,000,000, after which Beacon Chain validators would produce blocks.

Completing that transition removed a major source of immediate implementation uncertainty. It did not promise a higher ether price, lower transaction fees or immediate withdrawals of staked ether. The Foundation had explicitly described the change as a consensus transition and said withdrawals would require a subsequent upgrade.

The September 18 decline therefore should not be interpreted as evidence that the protocol transition failed. A more defensible contemporaneous interpretation is that traders had already priced substantial Merge expectations before activation, while macroeconomic pressure continued after the technical event passed.

Inflation remained the dominant external pressure

The U.S. Bureau of Labor Statistics had reported on September 13 that the Consumer Price Index for All Urban Consumers increased 0.1% on a seasonally adjusted basis in August and 8.3% over the preceding 12 months. Core CPI, excluding food and energy, increased 0.6% during August and 6.3% over 12 months.

Those figures reinforced expectations that the Federal Reserve would maintain restrictive monetary policy. Contemporaneous market coverage connected the inflation release with declines across risk assets, including cryptocurrencies. That connection is contextual rather than proof of single-cause attribution: weekend liquidity, positioning around the Merge and asset-specific selling could also have influenced the September 18 moves.

What the date established was narrower but significant. Ethereum had executed its most important protocol change without an evident consensus breakdown, yet ether’s market price still suffered a larger weekly loss than bitcoin. The separation between engineering achievement and asset valuation was unmistakable.