This is a PRO endpoint, available to any paid tier
HyperEVM (999) is not supported yet

Query Parameters
Your Etherscan API key.
Chain ID to query, eg
1 for Ethereum, 8453 for Base from our supported chains.Set to
token for this endpoint.Set to
topholders for this endpoint.Contract address of the ERC-20 token.
Number of top holders to return, up to 1000.