alchemy_requestGasAndPaymasterAndData

Requests gas and coverage for a UserOperation. Returns paymasterAndData and gas parameters if approved, errors if not. Optionally accepts fee parameter overrides to be used in the UserOperation.

Network Support

ChainMainnetTestnet
Ethereum:white-check-mark::white-check-mark:
Polygon:white-check-mark::white-check-mark:
Arbitrum:white-check-mark::white-check-mark:
Optimism:white-check-mark::white-check-mark:
Base:white-check-mark::white-check-mark:

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Overriding gas and fee

You can override our gas and fee estimates using the overrides parameters. Use this parameter to optionally override available fields: maxFeePerGas, maxPriorityFeePerGas, callGasLimit, verificationGasLimit, orpreVerificationGas. This will apply either

  1. absolutes overrides (using a hex string) simply overriding estimated values entirely OR
  2. multiplier overrides relative to our estimates (in the format of { "multiplier": number } with max precision of 4 decimal places). For example, if the override value is { multiplier: 1.1 } for the maxPriorityFeePerGas field, then a 1.1 multiplier, or a 10% increase, is applied to the estimated maxPriorityFeePerGas of the user operation.

These overrides will be applied for every user op sent with this provider. A higher buffer may give UOs a better chance to mine if the L1/L2 gas and fees change.

"overrides": {
  "maxFeePerGas": "hex string" | { "multiplier": number },
  "maxPriorityFeePerGas": "hex string" | { "multiplier": number },
  "callGasLimit": "hex string" | { "multiplier": number },
  "verificationGasLimit": "hex string" | { "multiplier": number },
  "preVerificationGas": "hex string" | { "multiplier": number },
}

For backward compatibility, we will process at feeOverrideif overrides is not provided, however we suggest using overrides.

:warning:Deprecated: previous override using "percentage" has been deprecated in favor of "multiplier" values

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NOTE

This endpoint does not require a valid signature field. 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

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