Bitcoin Sinks to $83,000 as Oil Reclaims $100

Bitcoin fell to $83,000 Monday and altcoins reversed Friday's rally as Brent crude climbed back above $100 after Trump rejected Iran's Hormuz terms.

Bitcoin fell 1.7% to $83,000 since midnight UTC on Monday, down 2.1% over 24 hours, but CoinDesk reports the altcoin market took the brunt of the damage: 91 of the CoinDesk 100 constituents were lower on the day and the index dropped 2.6% to 1,874.56. The unwind mirrored Friday's rally almost exactly, with quant (QNT) falling 16%, The Graph down 12%, and Ondo 12% lower. Hedera was the lone standout, up 13% since midnight to $0.11 as the only CoinDesk 100 token gaining more than 3%, with no fresh news behind the move beyond Hashgraph's Sept. 23 listing of its IDTrust platform on IBM's cloud catalog.

According to CoinDesk, the catalyst came from energy markets rather than crypto itself: President Donald Trump rejected Iran's latest conditions for reopening the Strait of Hormuz, which included releasing frozen Iranian funds, lifting oil sanctions, and ending the U.S. naval blockade of Iranian ports. Brent crude climbed back above $100 to $100.83, up 3.2% on the day, reversing Friday's move below that level. Traditional assets sold off alongside crypto, per CoinDesk — gold fell 3.3% to $4,144, silver 5.1% to $61.00, S&P 500 futures dropped 0.44%, Nasdaq 100 futures 0.95%, while the dollar index firmed 0.06% to 101.09.

The derivatives data in CoinDesk's report points to unwinding rather than fresh conviction. Trading volume jumped 70% to $172 billion over 24 hours while open interest fell 3% to $150 billion — a pattern of positions being closed rather than new bets being placed. The 24-hour taker long/short ratio stood at 46.9% to 53.1%, giving aggressive sellers a slight edge. Bitcoin futures OI dropped to 650K BTC, the lowest since March, with negative funding rates across major exchanges. The most-traded Deribit contract was the $84,000 bitcoin put expiring Sept. 30, though the $2,850 ETH call expiring Oct. 20 led Ether options activity, and Volmex's BVIV rose only slightly to 37.4%.

CryptoPotato reports a packed macro calendar could inject further volatility: Tuesday brings August JOLTS job openings and September consumer confidence, Wednesday delivers the Fed's preferred inflation gauge — the August PCE price index — plus the final Q2 2026 GDP estimate, Thursday the September ISM Manufacturing PMI, and Friday at 8:30 am ET the September jobs report. According to CryptoPotato, the Fed hiked rates earlier this month for the first time in over three years, so hotter price pressures could strengthen expectations for another increase, and it counted 22 scheduled Fed speaker events this week. CoinDesk notes CoinMarketCap's altcoin season index still sits at 65/100, its highest in more than three months, despite Monday's selloff.