You can create routes using only the search bar
We also have a SDK that you can integrate to your website. And here is an example of how it is built.
Example: Swap from BSC to FTM (USDC(BSC)->Fantom(FTM))
bsc/USDC - starting Network and Token
fantom/FTM - target Network and Token
number at the end of the link is the amount you need to transfer