Recently, I wanted to track the price of NFT on global markets such as blur and opensea, so I looked in several NFT API providers (3rd party APIs such as : SimpleHash(https://simplehash.com/), Alchemy(https://docs.alchemy.com/reference/getnfts)), but in the end, I realized that the APIs provided are unstable. For example, the data is not reflected in real-time, A lot of transaction data was missing. Therefore, if possible, I would like to attach myself to the node and find the sale information, but is it possible to find on-chain exchange Sales data? and if I can, Can you explain to me how to do that?
The reason why I thought it was difficult is that first of all, I need to know the smart contract of every exchange, and then I need to keep track of the smart contract updates.
