Bitcoin falls to $83,000 while altcoins unwind Friday's rally

By CoinDesk

Bitcoin (BTC) fell to $83,000 on Monday, down 1.7% since midnight UTC and 2.1% over 24 hours, though it is the altcoin market taking the brunt of the damage, with 91 of the 100 CoinDesk 100 constituents lower on the day and the index down 2.6% to 1,874.56.

The unwind is almost a mirror image of Friday, with quant (QNT) falling 16% since midnight after rising 39% over 24 hours in Friday's session, indexing protocol token the graph (GRT) is down 12% having gained 14%, and tokenization token ondo (ONDO) is 12% lower. The sector indices that led the advance are leading the retreat, with the DeFi Select Index (DFX) down 6.4% and 7.3% over 24 hours while the CoinDesk Computing Index (CPUS) lost 3.2% and 5.0%.

The trigger sits in oil rather than in crypto, with President Donald Trump rejecting Iran's latest terms for reopening the Strait of Hormuz, conditions that included the release of frozen Iranian funds, the lifting of oil sanctions and an end to the U.S. naval blockade of Iranian ports. Brent crude has climbed back above $100 to $100.83, up 3.2% on the day, reversing Friday's move below that level.

Traditional assets are being sold with crypto, gold down 3.3% to $4,144, silver 5.1% to $61.00 and U.S. equity futures lower, S&P 500 contracts off 0.44% and Nasdaq 100 down 0.95%, while the dollar index firmed 0.06% to 101.09.

Derivatives positioning

  • Market-wide: Trading volume jumped 70% to $172 billion over 24 hours, while open interest (OI) fell 3% to $150 billion. Rising volume with falling OI points to positions being closed rather than new bets being placed.
  • Taker flow: The 24-hour taker long/short ratio stood at 46.9% to 53.1% as of 09:50 UTC. Aggressive sellers have a slight edge.
  • BTC OI drops further: Futures OI has dropped to 650K BTC, the lowest since March, as traders keep avoiding leverage. Funding rates are negative across major exchanges, so the positions that remain lean bearish.
  • ETH and SOL follow BTC’s lead: Ether OI fell to 12.85 million ETH, down from 13.95 million on July 1 and a late-May peak above 15.65 million. That decline came even as ETH rallied 68% since July 1, which means spot buying led the rally rather than leverage. SOL futures show the same pattern.
  • XRP OI rises: OI hit a four-week high of 2.46 billion XRP early today and has since eased to 2.37 billion.
  • Whale bias: Binance whales, measured by their long versus short positions, are bullish on BTC, down from extremely bullish on Friday. They have flipped bearish on ETH and remain bullish on SOL. XRP is bearish again, though less so than Friday's extremely bearish reading.
  • HBAR OI hits record high: OI surged to a record 2.30 billion HBAR while the spot price rose 48% in 24 hours, which suggests fresh longs. However, the 24-hour OI-adjusted cumulative volume delta is negative and annualized funding sits just above zero. Aggressive buyers are not powering the move, and shorts may be piling in against the rally.
  • Volatility slightly up: Volmex's BVIV, the 30-day implied volatility index for BTC, rose slightly to 37.4% after bouncing off the sub-36% floor it tested last week. The move is small, and traders still expect calm markets. Ether's EVIV shows the same. Wall Street's VIX rose to 16 on Friday from under 14.
  • Mixed volume profile in options: On Deribit, the $84,000 strike bitcoin put expiring Sept. 30 was the most traded contract over 24 hours. Put options are used to hedge against declines in prices for the underlying asset, in this case, bitcoin. For ETH, the $2,850 call expiring Oct. 20 led activity, which shows appetite for upside.

Token talk

  • Hedera (HBAR) is the outlier by a distance, up 13% since midnight and 14% over 24 hours to $0.11, the only CoinDesk 100 constituent gaining more than 3% on the day. The token has been consolidating since a run from below $0.08 in the week of Sept. 19, and there is no fresh news behind Monday's move, though The Hashgraph Group listed its Hedera-based IDTrust identity platform on IBM's cloud catalog on Sept. 23.
  • Friday's leaders have given back more than they made, quant (QNT) falling 16% to $240.59, the graph (GRT) 12% and fartcoin (FARTCOIN) 12%, with AI agent token kite (KITE) down 11% and modular data availability token celestia (TIA) 9.1%.
  • DeFi is bearing the brunt of the reversal, uniswap (UNI) losing 7.9% to $8.91 and 11% over 24 hours, lending protocol token morpho (MORPHO) 7.5% and 8.5%, and ondo 12% on the day, the sector index down 6.4% having risen 8.7% over the rolling day on Friday.
  • Bitcoin cash (BCH) has continued to unwind its CME-driven surge, down 7.7% to $306.69 and 10% over 24 hours, while sui (SUI) fell 6.2% and solana (SOL) 2.9% to $118.41.
  • A handful of older layer-1s held up, algorand (ALGO) rising 2.3% and XDC network (XDC) 2.3%, with just (JST) up 1.3% and IOTA (MIOTA) 1.0%, all four also higher over 24 hours.
  • CoinMarketCap’s “altcoin season” index remains inflated at 65/100, its highest total in more than three months despite Monday morning’s selloff.

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