FAQ

Hi, I am currently using 'latest' as the toBlock parameter. How can I know which block is the last one you indexed?. I want to know this so the next time I sync with your data I will query from that block + 1 onwards.

I set up a couple of functions that should look through the transfer history of an address and then return the transfer history as far as I can tell from the docs. I cycle through the pages as needed with a helper function. I've tried this on a number of my NFTs and they are all returning an empty transfer history. Did I set these up wrong or something? The address that I am currently searching a transaction history for is 0x8e6e63e05fffc220f808674e6ce14c82799d9f84 and the id is 6074. This set of functions returns an empty array however. ``` const getTokenResponse = async (token, contractAddress, currentNftId, pageKey=null) => { const address = [contractAddress]; if (pageKey !== null) { const response = await alchemy.core.getAssetTransfers({ fromBlock: "0x0", contractAddresses: address, category: [token.tokenType.toLowerCase()], excludeZeroValue: false, pageKey: pageKey }); return response; } else { const response = await alchemy.core.getAssetTransfers({ fromBlock: "0x0", contractAddresses: address, category: [token.tokenType.toLowerCase()], excludeZeroValue: false, }); return response; } } export const getNFTTransferHistory = async (token, contractAddress, currentNftId) => { const address = [contractAddress]; let nftTxnHistoryItems = []; let continueSearching = true; let currentResponse = {} while (continueSearching) { if ('pageKey' in currentResponse && currentResponse['pageKey']) { currentResponse = await getTokenResponse(token, contractAddress, currentNftId, currentResponse['pageKey']); } else { currentResponse = await getTokenResponse(token, contractAddress, currentNftId); } if (!('pageKey' in currentResponse && currentResponse['pageKey'])) { continueSearching = false; } let txns = currentResponse.transfers.filter( (txn) => { token.tokenType.toLowerCase() === "erc721" ? fromHex(txn.erc721TokenId) : txn.erc1155Metadata[0].tokenId === nftId } ) if (txns.length > 0) { for (let i = 0; i < txns.length; i++) { nftTxnHistoryItems.push(txns[i]); } } } return nftTxnHistoryItems; } ```

Why do I get transactions with same hash when I use getAssetTransfers call for a particular address ? For example, while getting transactions for address 0xcd531ae9efcce479654c4926dec5f6209531ca7b, I get two objects with same hash value? [ { blockNum: '0xf8fbe2', uniqueId: '0x41f43d9358d65230d7993c6e39c232570379e3750e06dd5f7b5b91c39364c780:log:47', hash: '0x41f43d9358d65230d7993c6e39c232570379e3750e06dd5f7b5b91c39364c780', from: '0xcd531ae9efcce479654c4926dec5f6209531ca7b', to: '0xc6bd16f378127a0dda3b773ec2401ed25c0a163e', value: 6579818.844366, erc721TokenId: null, erc1155Metadata: null, tokenId: null, asset: 'USDC', category: 'erc20', rawContract: { value: '0x05fbfbc3d0ce', address: '0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48', decimal: '0x6' }, metadata: { blockTimestamp: '2023-01-02T06:51:11.000Z' } }, { blockNum: '0xf8fbe2', uniqueId: '0x41f43d9358d65230d7993c6e39c232570379e3750e06dd5f7b5b91c39364c780:external', hash: '0x41f43d9358d65230d7993c6e39c232570379e3750e06dd5f7b5b91c39364c780', from: '0xcd531ae9efcce479654c4926dec5f6209531ca7b', to: '0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48', value: 0, erc721TokenId: null, erc1155Metadata: null, tokenId: null, asset: 'ETH', category: 'external', rawContract: { value: '0x0', address: null, decimal: '0x12' }, metadata: { blockTimestamp: '2023-01-02T06:51:11.000Z' } } ]

I fetched eth transfers using alchemy_getAssetTransfers rpc. But size of transfer is different from the last I called the rpc It seems result of latest block is missing when I called and I filled after a few seconds elapsed. When can I expect the full result of the last block after Initial fetching of latest block?