BSC and Polygon will be supported before we move to prod, we're still looking at which providers to use to get the best quality/cost ratio for tokens/nft/history discovery.

Other EVM chains can still be used, there's just no automatic token discovery, history and automatic gas fee calculation.

Cardano is not an EVM chain, so it would be a huge endeavor to implement it.

Please give our Beta a try if you have the time =)