eth_getBlockTransactionCountByHash

eth_getBlockTransactionCountByHash returns the number of transactions in the Avalanche C-Chain block identified by a given 32-byte hash. It is a lightweight (1 CU) lookup — you learn how full a block is without pulling its full body or any transaction data. On the C-Chain, where gas is paid in AVAX and blocks finalize in roughly one to two seconds, this is handy for gauging activity cheaply. Send the hash to https://avalanche.therpc.io/YOUR_API_KEY (chain ID 43114); the count comes back as a hex string like "0x0" for an empty block.

Use cases

• Quickly gauge how full a C-Chain block is without fetching its full body.
• Validate that a block holds the expected number of transactions after indexing it.
• Measure throughput across a set of known C-Chain block hashes to chart activity over time.

Parameters

Response

Example request

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

Try it live in the Avalanche playground.

Errors & troubleshooting

Common pitfalls

• An unknown hash returns null, not "0x0" — null-check before running parseInt, or you will misread a missing block as an empty one.
• If you hold a block number rather than a hash and do not need hash-based certainty, use eth_getBlockTransactionCountByNumber instead.

Supported networks

• Mainnet — Chain ID: 43114
• Fuji

See also

• eth_getBlockTransactionCountByNumber
• eth_getBlockByHash
• eth_getTransactionByBlockHashAndIndex

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