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Unichain

eth_getTransactionByBlockNumberAndIndex

The eth_getTransactionByBlockNumberAndIndex method returns detailed information about a transaction by specifying its position (index) within a block identified by the block's number or tag. This method is particularly useful for retrieving transactions from known block heights or special blocks like "latest".

Use Cases

• Real-time transaction monitoring
• Block explorer functionality
• Specific transaction analysis
• Historical data extraction
• Transaction verification
• Sequential transaction processing
• Smart contract interaction analysis
• Mempool investigation (using "pending" tag)

Method Details

This method locates a transaction using both a block number (or tag) and the transaction's index within that block.

Response Example

1{
2	"jsonrpc": "2.0",
3	"id": 1,
4	"result": {
5		"blockHash": "0x0f2c90d18695045ede8b52476bba47db4c99ad8e9c748dd64147dcb698e88d5f",
6		"blockNumber": "0x1194bb0",
7		"from": "0xef3a770aec2e5e97994c8f0e283e7992e2c39a2a",
8		"gas": "0x2b13c",
9		"gasPrice": "0x342770c00",
10		"maxFeePerGas": "0x342770c00",
11		"maxPriorityFeePerGas": "0x3b9aca00",
12		"hash": "0xa1c2c6b23cec00cdfa10a2bc30357c4250a2efb3cdf3c4d5c71e8b90ccb9071d",
13		"input": "0x095ea7b30000000000000000000000007a250d5630b4cf539739df2c5dacb4c659f2488dffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
14		"nonce": "0x1a8",
15		"to": "0x6982508145454ce325ddbe47a25d4ec3d2311933",
16		"transactionIndex": "0x0",
17		"value": "0x0",
18		"type": "0x2",
19		"accessList": [],
20		"chainId": "0x1",
21		"v": "0x1",
22		"r": "0xea5232855738e1c0d1a6695f0a0c76de2db3c6c84eec9d7b7f4523d8dc0db1d5",
23		"s": "0x2fd0b585c8e8df25e2e95ca8afe94b2d84a4c298d1e526f9afa0c2f1d492cd0d"
24	}
25}

Block Tag Meanings

• latest: The most recently mined block
• earliest: Genesis block (block 0)
• pending: Currently pending block (transactions in mempool)
• safe: Latest block considered safe by network
• finalized: Latest block that has achieved finality

See also

• eth_getTransactionByBlockHashAndIndex
• eth_getTransactionByHash

1curl https://unichain.therpc.io \
2  -X POST \
3  -H 'Content-Type: application/json' \
4  -d '{"jsonrpc":"2.0","id":1,"method":"eth_getTransactionByBlockNumberAndIndex","params":["0x1194BB0","0x0"]}'