Yes! Swapper uses layer 1 features from Algorand blockchain to power its tools. No smart contracts involved!
You can check our Tutorial page to watch an example swap.
Yes! Just click the "ADD ASSET" button while creating the swap to add up to 16 assets in a single swap.
Swaps are valid for approximately 1 hour. This duration is not expandable due to blockchain limitations.
We currently don't have an API, but we have plans to create one. No ETA yet.