有没有办法在转账 function 调用时获得代币价格？

Question

is it possible to know for which price user is buying/selling token on transfer function call?

I want to store information on the contract for with user bought/sold tokens on the transfer function.

Answer 1

No, this is not possible, at least in a token contract, because the token contract only "knows" that the user send or approved tokens and that's all that can know, it could be possible in a dex or cex contract

Answer 2

Yes it is possible. this is where oracles comes into play chainlink oracle provide off-chain data like token price feeds in contract in a decentralised way. Here is how you can get token price feed in smart contract in EVM-compatible blockchains