Arbitrum/Bitcoin (ARBBTC) experienced significant market activity on October 21, 2025, trading between 2.82e-6 and 2.95e-6. Bearish pressure intensified after 17:30 ET, with trading volume surpassing 70,000 at 01:30 ET, leading to a sharp decline to 2.86e-6. The price approached a critical support zone near 2.82e-6, as technical indicators like RSI and MACD suggested weakening momentum. Bollinger Bands contracted at midday and expanded during overnight trading, indicating increased volatility. Fibonacci retracement levels highlight 2.82e-6 as a crucial support; a breach could see the price testing 2.80e-6. The 15-minute chart revealed bearish 20-period and 50-period moving averages, with a bearish engulfing pattern forming around 17:30 ET. A doji near 2.93e-6 indicated market hesitation, followed by a breakout and increased volume, leading to consolidation near 2.86e-6. The market remains poised for a potential breakout or further decline.