NFTs with a floor you can check.
Each mint costs a little more than the last, and every ETH paid into the curve stays in escrow. Hand an NFT back whenever you like and the curve pays you what it says it is worth — so the floor is not a promise somebody is making, it is money the contract is holding.
No collections yet
Either nobody has launched one, or the indexer has not caught up. A collection created moments ago is on chain before anything has indexed it — its own page will work before this list does.