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I see the fallback function of a contract as a way of "depositing" an Ether value to the contract. My question is very simple I guess, but I couldn't find the answer yet.
Is it possible to develop a fallback function to deposit ERC20 tokens into a contract? What's the best way to deposit ERC20 tokens to a contract, VIA contract (by deposit I mean 'ownership transfer')? Like use the key payable but instead of sending ether, send ERC20 tokens.
I suggest you use the new up to date erc20 standard call erc777. The erc777 is new and improve version of erc20 and it is still compatible with old erc20 contract. It has a tokenReceived function which the contract must register its on erc1820. It almost the same as the fallback ethereum function, if the balance of the registered address increases, execute that function on that address.
tokenReceived function, hence there is no difference from any other standard (in the sense that it's up to you to implement that). And in short, I don't see how it answers the question.
Sep 3, 2019 at 6:21
payablekeyword for tokens, since a Token (ERC20, for example) is a standard which is defined "one layer above the blockchain". Think of it as something like "Ether - hardware layer, Token - software level". Just implement the ERC20 standard functions, and they will allow you to do what you're asking.