alchemy_simulateUserOperationAssetChanges

📘
NOTE
This endpoint does not require a valid signature field in userOperation. It just requires a dummy signature for gas estimation. You can use the dummy signature mentioned below when the sender account is LightAccount or SimpleAccount:
0xfffffffffffffffffffffffffffffff0000000000000000000000000000000007aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa1c

📘

NOTE

This method accepts an array containing a UserOperation, an Entrypoint address and a block override param however you will see these 3 items three times in the param array below. This has to do with Readme (our docs platform) not supporting multi-type arrays. To workaround, you will need to expand each option from those 3 array items to make the in-browser request work.

If you are still unable to make the in-browser request work, you can use the sample request given below:

curl --location 'https://eth-mainnet.g.alchemy.com/v2/alch-demo' \
--header 'Content-Type: application/json' \
--data '{
           "method": "alchemy_simulateUserOperationAssetChanges",
           "params": [
              {
                "sender": "0xceb161d3e0B6d01bc0e87ECC27fF9f2E2eCDCD81",
                "nonce": "0x3",
                "initCode": "0x",
                "callData": "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",
                "callGasLimit": "0x7A1200",
                "verificationGasLimit": "0x927C0",
                "preVerificationGas": "0x15F90",
                "maxFeePerGas": "0x656703D00",
                "maxPriorityFeePerGas": "0x13AB6680",
                "paymasterAndData": "0x9db7f05b0eb93eb242b5913596dcfaada756af5c",
                "signature": "0xfffffffffffffffffffffffffffffff0000000000000000000000000000000007aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa1c"        
              },
              "0x5ff137d4b0fdcd49dca30c7cf57e578a026d2789",
              "0x113CF6E"
           ]
        }'