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Simulates one or more transaction bundles against the current pre-confirmed Flashblock state. Supports state overrides, multi-block simulation, and optional transfer tracing.
Only available on Flashblocks endpoints: https://mainnet-preconf.base.org / https://sepolia-preconf.base.org.

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Parameters

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simulationPayload
object
required
The simulation configuration.
​
blockParameter
string
required
Use "pending" to simulate against the current Flashblock state.

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Returns

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result
array
Array of simulated block results, one per entry in blockStateCalls.

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Example

curl https://sepolia-preconf.base.org \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_simulateV1",
    "params": [
      {
        "blockStateCalls": [
          {
            "calls": [{"to": "0x...", "data": "0x..."}],
            "stateOverrides": {}
          }
        ],
        "traceTransfers": true,
        "validation": true
      },
      "pending"
    ],
    "id": 1
  }'