## Goal Client application able to show a chart of price distribution of NFTs within a collection.  ```graphql collection(id: "$id") { priceDistributionChart(startDate: $startDate, endDate: $endDate) { price numberOfListings } } ``` ### Requirements - Proxy dolphin API for price distribution of listings associated to a collection and transform response according to the above query ### References Dolphin endpoint listing spread for information. ``` /collection/listingSpread ```