Hi, I understand that a contract has an address. When someone transfers ETH to the contract, is there a way to execute a certain function in the contract? Something like an event?

That’s an option, but if I can create something “simple” in pure Solidity without a dependency, I would prefer that.

receive() external payable {



}

inside do whatever you want

Thanks, that looks nice! . Thanks @advisosupport and @glooty too. These are good options. In order of preference, I’ll explore
receive() external payable, then fallback functions, then Openzeppelin ’s onReceive.sol.

receive() is new name for fallback function