eth_getTransactionByBlockHashAndIndex

eth_getTransactionByBlockHashAndIndex returns a single transaction from Polygon PoS (chain ID 137) by pointing at a block via its hash and giving the zero-based position of the transaction inside that block. On Polygon — the MATIC-fee, EVM-equivalent network producing ~2-second Bor blocks — this is the call to use when you already hold a block hash and want a specific entry without first pulling the entire block body. Send it to https://polygon.therpc.io/YOUR_API_KEY and you get the same transaction object eth_getTransactionByHash returns, or null when the block or index does not exist.

Use cases

• Walk every transaction in a specific Polygon block by incrementing the index from 0x0 until you hit a null.
• Pull the first transaction in a block to study ordering and MEV behaviour on Polygon's Bor producer set.
• Resolve a transaction when your reference is its block-hash-and-position pair (for example from a receipt or trace) rather than its own hash.

Parameters

Response

Example request

1curl https://polygon.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 Polygon playground.

Errors & troubleshooting

Common pitfalls

• The index is hex-encoded — pass "0x0" for the first transaction, not the integer 0.
• If the index is past the block's last transaction the call returns null rather than an error, so null-check before reading fields and treat it as your loop-termination signal.

Supported networks

• Mainnet — Chain ID: 137
• Amoy — Chain ID: 80002

See also

• eth_getTransactionByHash
• eth_getTransactionByBlockNumberAndIndex
• eth_getBlockByHash
• eth_getTransactionReceipt

1curl https://polygon.therpc.io/YOUR_API_KEY \
2  -X POST \
3  -H 'Content-Type: application/json' \
4  -d '{"jsonrpc":"2.0","id":1,"method":"eth_getTransactionByBlockHashAndIndex","params":["0x0000000000000000000000000000000000000000000000000000000000000000","0x0"]}'