The Federal Reserve's overnight reverse repo facility usage has plummeted to $0.637 billion as of March 19, signaling a near depletion of a key liquidity cushion. This development raises macroeconomic risks for Bitcoin, which has already seen a dip below $70,000 amid ETF outflows totaling $253.7 million over two days. The Fed's balance sheet rose to $6.656 trillion, while reserve balances fell to $2.999 trillion, indicating tighter financial conditions. The shrinking of the Fed's passive liquidity buffer means that future inflation scares or funding squeezes may exert more direct pressure on reserves, potentially necessitating active policy responses. This shift aligns with Bitcoin's trading patterns, which are increasingly influenced by macroeconomic factors such as interest rates and liquidity conditions. As the Fed moves towards active reserve management, Bitcoin's market dynamics may face new challenges without the previous automatic liquidity support.