Metaplex

https://api.expand.network/nft/getbalance?nftCollection=4N9UeWZ3QVS4aK7R25CRRWYmJ8wnwUDRPYV6ScJetuME&chainId=900&address=8RNA1UbU2jA6aXsrcQLY3VxNBkyMUVmanWYFVmCwPYkB

{
    "status": 200,
    "msg": "success",
    "data": {
        "balance": 1
    }
}

https://api.expand.network/nft/getmetadata?chainId=900&nftCollection=8fGYVuiq5REaVwWTwatPvk342dm4xSY9ok2dE5rYEU5f

{
    "status": 200,
    "msg": "success",
    "data": {
        "name": "Crowdsurfers #1000",
        "symbol": "CROWD",
        "uri": "https://us-central1-simpl3r.cloudfunctions.net/m?id=8fGYVuiq5REaVwWTwatPvk342dm4xSY9ok2dE5rYEU5f&pid=eW6BNOjMgIFva6BNQ4Du"
    }
}

https://api.expand.network/nft/getowner?chainId=900&nftCollection=8fGYVuiq5REaVwWTwatPvk342dm4xSY9ok2dE5rYEU5f

{
    "status": 200,
    "msg": "success",
    "data": {
        "owner": "98VK5fspL6j8837awbW5AB9dHbiLCoQQFziVejPKYnkG"
    }
}