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Our API can only read data that is public onchain. Lazy minted NFTs on an OpenSea shared contract are stored only in a centralized OpenSea database until the first transfer.

You can find more information on the OpenSea blog: <a href="https://opensea.io/blog/announcements/introducing-the-collection-manager/" rel="nofollow noopener noreferrer" target="_blank">https://opensea.io/blog/announcements/introducing-the-collection-manager/</a>.

Another reason may be that the NFTs from the OpenSea inventory are in different chains. In this case, you need to make API requests for each network. 

You are welcome to visit our <a href="https://docs.moralis.io/web3-data-api/reference/web3-api-version" rel="nofollow noopener noreferrer" target="_blank">documentation website</a> and <a href="https://www.youtube.com/c/MoralisWeb3/videos" rel="nofollow noopener noreferrer" target="_blank">YouTube channel</a>, for more useful resources and great tutorials on the Moralis Web3 development platform.

Why are number of NFTs different on OpenSea compared to Moralis API?

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You are welcome to visit our documentation website and YouTube channel, for more useful resources and great tutorials on the Moralis Web3 development platform.