The ad price is based on the bitcoin exchange rate. If the bitcoin exchange rates fluctuate greatly, the ad price may change rapidly.
Utomarket updates exchange rates and ad prices every 5 minutes. The prices displayed on the home page are cached and will be updated slowly. Sometimes, especially when bitcoin prices fluctuate rapidly, ads using the same price formula may show different prices. In addition, sometimes market data is not available for certain currencies, which will result in delays in the update of ad prices. However, when you open the ad page itself, the price will be the updated. The price of a transaction will be determined when the bitcoin buyer sends the transaction request.