eth_getTransactionByBlockHashAndIndex

Within any BNB Smart Chain block, transactions are stored in a fixed order, and eth_getTransactionByBlockHashAndIndex reaches one of them by its position. Give the method a 32-byte block hash plus a zero-based hex index and it returns that single transaction object, or null when the block or slot does not exist. Because BNB Smart Chain pays its validators in BNB and finalizes blocks in around three seconds under PoSA, addressing a transaction by block hash pins it to one specific, immutable block. Route the lookup through https://bsc.therpc.io/YOUR_API_KEY on chain ID 56.

Use cases

Walk a known BSC block end to end by incrementing the index from 0x0 until the method returns null.
Pull the very first transaction in a block to study how the validator ordered it and reason about MEV on chain 56.
Resolve a transaction you only know by its block-and-position reference, rather than starting from its own hash.

Parameters

#	Name	Type	Required	Description
1	`blockHash`	string (hex)	Yes	The hash of the block containing the transaction.
2	`transactionIndex`	string (hex)	Yes	Zero-based position of the transaction within the block.

Response

Type	Description
object \| null	Same transaction object as eth_getTransactionByHash. Returns null if block or index not found.

Example request

1curl https://bsc.therpc.io/YOUR_API_KEY \
2  -X POST \
3  -H "Content-Type: application/json" \
4  -d '{
5    "jsonrpc": "2.0",
6    "method": "eth_getTransactionByBlockHashAndIndex",
7    "params": [
8        "0x0000000000000000000000000000000000000000000000000000000000000000",
9        "0x0"
10      ],
11    "id": 1
12  }'

Try it live in the BNB Smart Chain playground.

Errors & troubleshooting

Code	Message	Cause
`-32602`	`Invalid params`	Block hash or transaction index is malformed.

Common pitfalls

The index argument is hex-encoded, so the first transaction is "0x0" — passing a bare integer 0 will be rejected as malformed.
Request an index past the last transaction and you simply get null back rather than an error, so guard against the null before reading fields.

Supported networks

Mainnet — Chain ID: 56
Testnet — Chain ID: 97