eth_simulateV1

​

Parameters:

1. simulationPayload - object - required

​

simulationPayload fields:

• blockStateCalls - array - required
  Array of block simulation objects. Each represents a simulated block.
• traceTransfers - boolean - optional
  If true, value transfers are included as logs. Defaults to false.
• validation - boolean - optional
  If true, applies validation checks such as nonce and balance. Defaults to false.

​

blockStateCalls object fields:

• calls - array
  List of transaction call objects to simulate
• stateOverrides - object - optional
  Override account state (balance, nonce, code, storage)
• blockOverrides - object - optional
  Override block-level fields (e.g. number, timestamp, baseFeePerGas)

​

call object fields:

• from - string - optional
  Sender address
• to - string
  Recipient address
• maxFeePerGas - string - optional
  Max fee per gas (hex)
• value - string - optional
  Value sent (hex)
• data - string - optional
  Hex-encoded calldata

2. blockParameter - string - required

​

Returns:

​

Call result fields:

• status - string
  ”0x1” = success, “0x0” = failure
• gasUsed - string
  Gas used (hex)
• returnData - string
  Return data (hex)
• logs - array
  Emitted logs (includes transfers if enabled)
• error - string
  Error or revert reason (if failed)

// Result (block header fields other than number, hash, gasUsed and baseFeePerGas omitted)
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": [
    {
      "number": "0x142bdbb",
      "hash": "0xbf966fe899c75ada50c5c73d67b18201b6c0d2c2c62e65adcb085aa928d0f8e6",
      "gasUsed": "0x5dba",
      "baseFeePerGas": "0x0",
      "calls": [
        {
          "returnData": "0x0000000000000000000000000000000000000000000000000000000000000000",
          "logs": [],
          "gasUsed": "0x5dba",
          "status": "0x1"
        }
      ]
    }
  ]
}

​

Example Request

curl https://mainnet.hyperliquid.validationcloud.io/v1/<YOUR_API_KEY_HERE>/evm \
    -X POST \
    -H "Content-Type: application/json" \
    -d '{
  "jsonrpc": "2.0",
  "method": "eth_simulateV1",
  "params": [
    {
      "blockStateCalls": [
        {
          "calls": [
            {
              "from": "0x29c7dbf15e5d385f936076736a0005433efaabf6",
              "to": "0xb329284a02508a4d09bedfdcedd4fc4ec55f3701",
              "data": "0x70a0823100000000000000000000000029c7dbf15e5d385f936076736a0005433efaabf6"
            }
          ]
        }
      ],
      "traceTransfers": false,
      "validation": false
    },
    "latest"
  ],
  "id": 1
}'