A PCS (Price Comparison Service) is a service that helps you compare prices from different sources so you can get the best deal. Without a PCS, it can be difficult to find the best price for a particular item. However, if you are looking to buy cryptocurrency, there is still liquidity on PancakeSwap, and aggregators can help you get a better price since there are multiple locations with different prices. Aggregators are services that collect data from multiple sources and compare them to give you the best price. This can be a great way to save money when buying cryptocurrency, as you can compare prices from different sources and find the best deal.