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Speaking of Ethereum blockchain, or any other one compatible with it: Polygon, Avalanche and others: is calling the function approve(...) mandatory only, and only, when there's a token involved in transfer/tranferFrom?

Or is it also required for the native coin - ETH (AVAX, MATIC respectufully)? And if not, why not?

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The approve function is an explicit function in an ERC20 token contract (and is part of the ERC20 standard). It's used when transferring ERC20 tokens indirectly - if direct transfer is used then approve is not needed.

The native asset (such as Ether) can only be transferred directly and it does not have a related contract. All of its functionality is built-in and it always works the same, regardless of where it's used. So, approve is related only to ERC20 token standard (and some other standards), not to the native asset.

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  • more precisely: approve is required ONLY a) for ERC20 tokens b) when transferFrom(..) is used?
    – Markus736
    Commented Feb 27, 2022 at 14:51
  • Well, other token standards also use approve, but otherwise both points are correct.
    – Lauri Peltonen
    Commented Feb 28, 2022 at 6:54

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