Get the number of transactions in a block.
curl "https://api.etherscan.io/v2/api?chainid=1&module=proxy&action=eth_getBlockTransactionCountByNumber&tag=0x10FB78&apikey=YourApiKeyToken"
{ "jsonrpc": "2.0", "id": 1, "result": "0x3" }
1
8453
proxy
eth_getBlockTransactionCountByNumber