On Tuesday, an American online non-fungible token marketplace, OpenSea, publicized that it has increased its offerings to add on projects developed on Ethereum layer-2 scaling solution called Optimism.
Optimism connects five current networks that are backed by the marketplace, including Ethereum, Solana, Polygon, Klatyn, and Arbitrum.
Source: https://www.thecoinrepublic.com/2022/09/29/opensea-nft-marketplace-backs-optimism/