Ethereum

I am writing a smart contract which is buying coins on uniswap, is there a way to use other routers ? I would like to get best prices and lowest fees. Any links would be great too.

A common way is to use an external API that returns the swap route as calldata that you can sign and call like 0x Swap API

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A common way is to use an external API that returns the swap route as calldata that you can sign and call like 0x Swap API

https://0x.org/docs/0x-swap-api/guides/swap-tokens-with-0x-swap-api