How can I get the deal price of a transaction?

[0xUniko]

If I buy an nft and the transaction is recorded on chain. How can I get the deal price of the transaction from the on-chain data?

[Slokh]

There's no real concept of "price" with Seaport as you can also swap NFT <> NFT, so it's slightly more tricky.

You're interested in the OrderFulfilled event for this. https://github.com/ProjectOpenSea/seaport/blob/main/contracts/interfaces/ConsiderationEventsAndErrors.sol#L27-L34

You'll need to determine the deal price based on the offer and consideration depending on the use case, where itemType is NATIVE or ERC20 for the traditional use cases of ERC721<>ERC20/ETH and ERC1155<>ERC20/ETH