[BUG] <Message: Invalid params. Data: {'reason': 'unknown field `simulation_flags`, " "expected `request` or `block_id` at line 1 column 1060'}> about starknet.py

[tkumor3]

Are you sure that you use RPC 0.6.0 (alchemy and infura)? simulation_flags was added in 0.6.0. If you want to use RPC 0.5 the recommended version of starknet.py will be 0.18.2

[LikoIlya]

Had the same issue with alchemy provider
Req:

{
  "jsonrpc": "2.0",
  "method": "starknet_estimateFee",
  "id": 0,
  "params": {
    "request": [
      {
        "type": "INVOKE",
        "version": "0x100000000000000000000000000000003",
        "signature": [
          "0x4e66d21d3d7f3114feb4e71e58e45ae0822eab8942770e163a285ed270aad7b",
          "0x7386eeb3be2626b055d6938780ef4a995ec28c51127325abc91d215a47d4278"
        ],
        "nonce": "0x6e",
        "tip": "0x0",
        "nonce_data_availability_mode": "L1",
        "fee_data_availability_mode": "L1",
        "paymaster_data": [],
        "resource_bounds": {
          "l1_gas": {
            "max_amount": "0x0"
          }
        }
      }
    ]
  }
}

Res:

{
  "jsonrpc": "2.0",
  "id": 0,
  "error": {
    "code": -32602,
    "message": "Invalid params",
    "data": {
      "reason": "unknown field `simulation_flags`, expected `request` or `block_id` at line 1 column 2169"
    }
  }
}

[tkumor3]

In starknet-spec RPC 0.6.0 starknet_estimateFee has required param simulation_flags https://github.com/starkware-libs/starknet-specs/blob/159fb9c887402a96056dc405f374c4df27a14bf8/api/starknet_api_openrpc.json#L638. It seems to be a problem with alchemy. Probably they use an older version of the RPC. I suggest ensuring which version of RPC is used on Alchemy and using the relevant version of starknet.py