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Supported on Monad Mainnet and Testnet.

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The Monad Mainnet Indexing API is available to Pro tier users. The Monad Testnet Indexing API is accessible to Pro, Basic, and Lite tiers. Free tier members can also enjoy a trial period with 30 free calls. The same request URL is used for both mainnet and testnet. Network selection is handled automatically through the API key.
If you're interested, please register directly through here. Please note that the API Key can also be used for your RPC endpoint.

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This API only supports retrieving the top 1000 holders.

Parameter

contractAddress, string - a 42 character address with '0x' as prefix. The NFT collection contract address to check for holders.
cursor, string - next page cursor.
limit, int32 - the maximum number of results to return per page. Defaults to 20, maximum is 50.

Response

code, number - response status code, e.g., 0 for success.
message, string - response message, e.g., OK.
result, object - result object containing NFT holder data.
- data, array object - an array of NFT holder objects.
  - ownerAddress, string - the wallet address of the NFT holder.
  - amount, string - the number of NFTs owned by the holder.
  - uniqueTokens, number - the number of unique token IDs owned (important for ERC-1155).
  - lastTransaction, string - information about the last transaction.
  - percentage, string - the percentage of the total supply held by this holder.
  - value, string - the value of the NFTs (if available).
  - isContract, boolean - whether the holder address is a contract.
- nextPageCursor, string - the cursor for fetching the next page of results, if the last page has been reached, nextPageCursor will be an empty string ("").

Note on ERC-721 vs ERC-1155

ERC-721 (Traditional NFTs):
Each token is completely unique and can only have one owner. For ERC-721 collections, you'll typically see:

amount equals uniqueTokens (e.g., owning 5 NFTs means 5 unique token IDs)
Each token ID is owned by exactly one address
Example: CryptoPunks, where each punk has a unique token ID and can only be owned by one wallet

ERC-1155 (Multi-token Standard):
Allows multiple tokens of the same ID (fungible) and unique tokens (non-fungible) to exist in the same contract. For ERC-1155 collections:

amount can be higher than uniqueTokens (e.g., owning 100 items might only be 10 different token IDs with multiple copies)
The same token ID can have multiple copies owned by the same or different addresses
Example: A gaming item collection where a "Common Sword" (ID #1) might exist in 1000 copies, while a "Legendary Shield" (ID #50) might exist in only 5 copies