Is there a single webpage that lists the current transaction fees for the major blockchains, like BTC, ETH, solana, avalanche, matic, BCH, BSC, etc?
I think there's no website that has a feature like what you're looking for.
Why not check them one by one in different blockchains that the website has. IMO, blockchair.com the link the dropped above is more accurate to that but instead of the transactions fee comparison, it's a graph.