li>
<li><code>getSpamContracts()</code>: Returns a list of all spam contracts marked by Alchemy.</li>
<li><code>reportSpam()</code>: Report feedback that a given NFT contract address is a spam contract as defined by Alchemy.</li>
<li><code>isAirdropNft()</code>: Check whether the given NFT token is marked as an airdrop or not. Airdrops are defined as NFTs that were minted to a user address in a transaction sent by a different address.</li>
<li><code>refreshNftMetadata()</code>: Refresh the cached NFT metada