Overnight interbank lending rates have shot up past 30%, according to BBO's Mr. Dallen.

WSJ: Ch��vez Spurs Bank Fears

"The U.S. remains the only actual customer paying cash and at full-price, " said Russ Dallen, head trader at Caracas' BBO Financial Services.

CNN: Obama finds support among Chavez faithful in Caracas

"There are virtual runs on some of the banks ... that are rumored to be in trouble, " said Russ Dallen, a banking analyst at BBO Financial Services in Caracas.

WSJ: Ch��vez Spurs Bank Fears