eth_getTransactionCount - Validation Cloud

Returns the number of transactions sent from an address. This method will use 40 Compute Units.

Reference: Here

Parameters

DATA, 20 Bytes - address.
QUANTITY|TAG - integer block number, or the string "latest", "earliest" or "pending", see the default block parameter

params: [
  "0x407d73d8a49eeb85d32cf465507dd71d507100c1",
  "latest", // state at the latest block
]

Returns

QUANTITY - String hex value representing integer of the number of transactions sent from this address.

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x1" // 1
}

curl https://mainnet.base.validationcloud.io/v1/<YOUR_API_KEY_HERE> \
    -X POST \
    -H "Content-Type: application/json" \
    -d '{"jsonrpc":"2.0","method":"eth_getTransactionCount","params":["0x407d73d8a49eeb85d32cf465507dd71d507100c1","latest"],"id":1}'

curl https://sepolia.base.validationcloud.io/v1/<YOUR_API_KEY_HERE> \
    -X POST \
    -H "Content-Type: application/json" \
    -d '{"jsonrpc":"2.0","method":"eth_getTransactionCount","params":["0x6512fF4E0dA35D0F0Be9a5d60Db50046fE4980b0","latest"],"id":1}'