Bitcoin climbed as much as 10% on Zimbabwe’s Golix exchange on Wednesday after the country’s armed forces seized power.

The price of the cryptocurrency in the Southern African nation jumped as high as $13,499, almost double the rate at which it trades in international markets, according to prices cited on Golix’s website.

Demand for Bitcoin in Zimbabwe has surged amid a shortage of hard currency. Golix processed more than $1 million of transactions in the past 30 days, compared with turnover of $100,000 for the whole of 2016, according to data on the exchange’s website. Zimbabwe doesn’t have its own currency, with the government adopting the US dollar and South African rand, among others, as legal tender in 2009 after hyperinflation rendered the local dollar worthless.

Golix, an unregulated platform that also trades other cryptocurrencies, has been in operation since 2014. Prices for Bitcoin are set by supply and demand, according to Taurai Chinyamakobvu, co-owner of the exchange. Sellers are paid in US dollars deposited electronically, which can only be converted at a steep discount on the black market.