Simulate JSON RPC

tenderly_simulateTransaction

Simulates transaction as it would execute on the given block.

Params

1. Transaction Transaction OBJECT
   • from (optional) STRING: hex encoded address
   • to STRING: hex encoded address
   • gas (optional) NUMBER
   • maxFeePerGas (optional) NUMBER max fee: The maximum total fee per gas the sender is willing to pay (includes the network / base fee and miner / priority fee) in wei
   • maxPriorityFeePerGas (optional) NUMBER max priority fee: Maximum fee per gas the sender is willing to pay to miners in wei
   • gasPrice (optional) NUMBER: The gas price willing to be paid by the sender in wei
   • value (optional) NUMBER
   • data (optional) STRING: hex encoded bytes
   • accessList (optional) ARRAY of Access list entry OBJECT
     • address STRING hex encoded address
     • storageKeys ARRAY of STRING representation of 32 byte hex encoded storage key
2. Simulation Block Number (optional) The block number against which transaction should be simulated. Either:
   • STRING Block number
   • ENUM of Block tag earliest|finalized|safe|latest|pending
3. State Overrides (optional) MAP: mapping from an account (address) to override specification
   • key STRING: the account this override applies to
   • value OBJECT: the override specification
     • nonce (optional) STRING: hex encoded 8 byte nonce override for the account
     • code (optional) STRING: data of the code override for the account
     • balance (optional) STRING: hex encoded 32 byte balance override for the account in wei
     • stateDiff (optional) MAP: mapping of storage key to storage value override
       • key STRING: the storage key
       • value STRING: the value override for the given storage key
4. Block Overrides (optional) OBJECT: The set of header fields to override in a block.
   • number (optional) STRING: hex, overrides the block number
   • difficulty (optional) STRING: hex, overrides the block difficulty
   • time (optional) STRING: hex, overrides block timestamp
   • gasLimit (optional) STRING: hex, overrides gas limit
   • coinbase (optional) STRING: hex, overrides block miner
   • random (optional) STRING: hex, overrides the blocks extra data which feeds into the RANDOM opcode
   • baseFee (optional) STRING: hex, overrides block base fee

Example

{
  "id": 0,
  "jsonrpc": "2.0",
  "method": "tenderly_simulateTransaction",
  "params": [
    {
      "from": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
      "to": "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
      "data": "0xa9059cbb00000000000000000000000020a5814b73ef3537c6e099a0d45c798f4bd6e1d60000000000000000000000000000000000000000000000000000000000000001"
    },
    "0xF4D880"
  ]
}

Result

Simulation result OBJECT

• status NUMBER: either 1 (success) or 0 (failure)
• gasUsed NUMBER: The amount of gas used by this specific transaction alone
• cumulativeGasUsed NUMBER: the total amount of gas used when this transaction was executed in the block
• blockNumber NUMBER: the block number in which this transaction was simulated
• type NUMBER: transaction type, 0x00 for legacy transactions, 0x01 for access list types, 0x02 for dynamic fees
• logsBloom STRING: bloom filter for light clients to quickly retrieve related logs
• logs: an array of emitted events ARRAY of OBJECT
  • name STRING: event name
  • anonymous BOOLEAN: indicates if event is anonymous
  • inputs: array of decoded log arguments ARRAY of decoded logs OBJECT
    • name STRING: event argument name
    • type STRING: event argument type from Solidity type system
    • value (optional) STRING string representation value of the argument; interpret according to the type field
  • raw OBJECT: raw logs
    • address STRING hex encoded address: address of the contract emitting the log
    • topics ARRAY of STRING 32 hex encoded bytes
    • data STRING hex encoded string representing event data
• trace: Trace ARRAY of OBJECT
  • type STRING type: trace item type - either CALL| CALLCODE| STATICCALL| DELEGATECALL| CREATE| CREATE2| SELFDESTRUCT
  • from STRING: hex encoded address
  • to STRING: hex encoded address
  • gas STRING: hex encoded unsigned 64 byte integer representing event gas
  • gasUsed STRING: hex encoded unsigned 64 byte integer representing event gasUsed
  • value STRING: hex encoded unsigned 64 byte integer representing event value in wei
  • error STRING: low-level error from virtual machine
  • errorReason STRING: extracted error reason in case of revert
  • input STRING: hex encoded string representation of raw input bytes for the trace point
  • method STRING: invoked contract method
  • decodedInput : decoded input for the invoked method - ARRAY of decoded in argument OBJECT
    • value STRING: string representation value of the argument; interpret according to the type field.
    • type STRING: the Solidity type of this argument
    • name STRING: the name of this argument
  • output STRING: raw trace output
  • decodedOutput : decoded output of the invoked method - ARRAY of decoded out argument OBJECT
    • value STRING: string representation value of the argument; interpret according to the type field.
    • type STRING: the Solidity type of this argument
    • name STRING: the name of this argument
  • subtraces NUMBER: number of child traces
  • traceAddress : trace position ARRAY of NUMBER
• assetChanges ARRAY:
  • type STRING type of asset change, can be transfer, mint, burn
  • from STRING: address of the sender (empty for mint transfers)
  • to STRING: address of the receiver (empty for burn transfers)
  • amount STRING: the amount of the token that was transferred
  • rawAmount STRING: raw amount transfer for the token
  • dollarValueSTRING: dollar value of the transferred token
  • assetInfoOBJECT: asset information
    • standard STRING: supported token standards: ERC20, ERC721, NativeCurrency
    • type STRING: the token type: Native, Fungible, Non-Fungible
    • contractAddressSTRING : address of the contract
    • symbol STRING: token symbol
    • name STRING: token name
    • logo STRING: URL for the token icon
    • decimals NUMBER: number of decimals in the token
    • dollarValueSTRING: dollar value of a single token
• balanceChanges ARRAY: an array of balance changes - cumulated asset changes
  • address STRING address
  • dollarValue STRING: dollar value of cumulated asset changes
  • transfers ARRAY: array of asset changes indexes