Hi Jass- Good question. I'm not sure, actually, as I've never tried it on a Polygon NFT. That said, my assumption is that, as long as you have a contract address (using a 721 contract) and a token ID, it *should* work. Usually the 404 error means one of those items is wrong (and/or simply does not exist). I don't know of a generative 10k set to try it on, though. I did try on a generic Polygon NFT that I think was an ERC1155, and it did NOT work. So, I suspect it all depends on the contract type. Not 100% sure, though, at this point. If you come to find out the answer, LMK. :-)