Bitcoin fell below $43,000 on Coinbase Exchange on September 20, 2021, as concerns surrounding heavily indebted Chinese property developer China Evergrande spread across global markets. Coinbase’s BTC-USD candle for the UTC day opened at $47,253.71, reached a low of $42,500 and closed at $43,012.97.
Those venue-specific figures represent a 10.06% decline from the UTC open to the session low and an 8.97% open-to-close loss. They are Coinburn calculations using unrounded Coinbase data. Bitcoin trades continuously, so the daily boundary, high, low and percentage change can differ across exchanges, currency pairs and data providers.
Ether sustained a larger percentage decline
Coinbase’s ETH-USD market opened the same UTC session at $3,328.70, traded as low as $2,911.81 and closed at $2,976.48. Ether therefore declined 12.52% from its open to its low and 10.58% from open to close. The comparison uses the same exchange, quote currency and 00:00-to-23:59 UTC measurement window for both assets.
The synchronized losses showed that the stress extended beyond bitcoin. Reuters reported during the September 20 session that bitcoin had reached $42,453.97 in its observed market feed and that ether had fallen below $3,000 for the first time since early August. The Reuters observation and Coinbase candle should not be treated as identical datasets: they used different market inputs and Reuters did not identify a single execution venue for its quoted bitcoin low.
Crypto traded as a risk asset
Contemporaneous Reuters and Bloomberg reports connected the digital-asset decline with fears that Evergrande’s financial problems could spill into the wider economy. Bloomberg’s report, republished by Fortune, recorded bitcoin down 8.1% near $43,743 at 5:11 p.m. New York time. It also reported a 1.7% fall in the S&P 500 during the conventional U.S. cash-market session.
The shared direction mattered because bitcoin was often promoted as an asset insulated from conventional financial shocks. The September 20 record instead showed bitcoin, ether and equities falling together while investors reduced exposure to risk. Continuous cryptocurrency trading also made digital assets available for repricing outside the operating hours of many traditional markets.
Coinburn cannot establish from simultaneous price movements that Evergrande concerns caused a specified portion of the cryptocurrency losses. Regulatory anxiety, leverage, liquidity conditions and asset-specific positioning were also part of the contemporaneous market discussion. The evidence supports a broad risk-off interpretation, not a single-variable causal model.
El Salvador moved against the market
The selloff produced an institutional counterpoint. President Nayib Bukele announced on September 20 that El Salvador had acquired another 150 bitcoin, bringing the government’s stated holdings to 700 bitcoin. Reuters and Bloomberg contemporaneously reported the announcement shortly after El Salvador had made bitcoin legal tender on September 7.
That statement established what the president said the government had purchased; it did not provide a wallet address, transaction identifiers, execution venue, acquisition price or independently audited custody record. The announcement therefore demonstrated continued government commitment to the policy, but it could not independently verify the complete holdings balance or the cost of the acquisition.
The strongest conclusion from September 20 is narrower: Coinbase’s BTC-USD market fell below $43,000, ETH-USD fell below $3,000, and both suffered substantial declines during a global risk-off session. The episode exposed crypto’s sensitivity to macroeconomic stress while a sovereign government publicly increased its bitcoin position into the decline.
The complete source packet and revision history are retained with the newsroom record.
Automated systems may have assisted with source organization and drafting. Coinburn is accountable for the published text and maintains a revision record.
This article provides news and analysis, not investment, legal or tax advice. Digital assets are volatile and may result in total loss.

