Bitcoin spot ETFs experienced a net outflow of $164 million on March 18, ending a seven-day streak of net inflows, according to SoSoValue data. The Fidelity ETF FBTC recorded the largest single-day outflow of $104 million. Meanwhile, Ethereum spot ETFs saw a net outflow of $55.7 million, breaking a six-day inflow streak. The Blackrock Staked ETH ETF ETHB registered the highest single-day inflow among Ethereum ETFs, with $1.13 million.