Silvergate Capital Corp said on Friday it made a "risk-based decision" to discontinue the Silvergate Exchange Network, its crypto payments network, two days after the digital asset-focused bank raised doubts about its viability. The Silvergate Exchange Network, one of the bank's most popular offerings, enabled round-the-clock transfers between investors and crypto exchanges, unlike traditional bank wires, which can often take days to settle. Silvergate shares on Friday slumped more than 2% in after-hours trading, after closing up 0.9% at $5.77 in regular trade.