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can someone explain why we need WETH? what's the purpose of WETH, can't we just use plain ETH? it's not like it removes the tx fees or something. Hopefully someone can shed light on the concept.

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Summarizing from https://weth.io/.

Ethereum's native token, ETH, doesn't follow the ERC20 standard.

The standard for tokens is ERC20, so in order to trade directly eth with alt tokens, ETH is wrapped into an ERC20 token, WETH.

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