API can't quote ETH swaps?

So I was looking through the API documentation and quotes require the token address of the from token and the to token, but since normal Ethereum doesn’t have a token address is there no way to quote swaps to/from Ethereum? Is there a stand-in value I can use to quote ETH conversions?

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The example swap URL has an example with ETH as a parameter, ETH is represented by the “e” address: