post https://eth-mainnet.g.alchemy.com/v2/
Estimates the gas values for a UserOperation.
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 isLightAccountorSimpleAccount:
0xfffffffffffffffffffffffffffffff0000000000000000000000000000000007aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa1c