Svmuu News According to Coinglass data, the Coinbase Bitcoin Premium Index has remained in negative premium for 10 consecutive days, currently reported at -0.0857%. The Coinbase Bitcoin Premium Index measures the difference between the Bitcoin price on Coinbase (a major US trading platform) and the global average market price. A negative premium typically reflects greater selling pressure in the US market, declining investor risk appetite, rising market risk aversion, or capital outflows.