OpenSea's model is simple - we take 2.5% of every transaction that happens on OpenSea. That's it. Users and partners can create NFTs for free at any time.
You can set a royalty of up to 10%. This means you can earn revenue every time your NFT sells on OpenSea. To learn how to set your royalty, click here.
If you are creating a collection on behalf of someone or as part of a group, please note that OpenSea doesn't support contract level splits at this time.
You'll need to handle splitting revenue between parties on your side once received. You may consider using third-party services like disperse.app that assist with sending multiple payments in one transaction.