Coinbase's Bitcoin Premium Index has recorded a negative value for six consecutive days, currently standing at -0.0919%, according to Coinglass data. This trend indicates ongoing outflows from Bitcoin spot ETFs and suggests weak buying power in the U.S. market. The index measures the price difference between Bitcoin on Coinbase and the global market average. A negative premium often signals stronger selling pressure in the U.S., a decline in investor risk appetite, and increased risk-off sentiment, reflecting capital outflows from the market.