Estimate Gas

Estimate gas costs for operations before execution.

Endpoint

POST /estimateGas

Description

Estimates the gas costs for operations before actually executing them. This endpoint returns the encoded UserOperation and gas estimates that can be used with the execute encoded endpoint.

Request Body

Same as Execute Operation endpoint.

Response

{
  "status": 1,
  "gas": 21000,
  "userOps": [
    {
      "encodedUserOp": "0x...",
      "userOpHash": "0x..."
    }
  ],
  "error": null
}

Response Fields

• status (integer): The status code (0 - failed, 1 - success)
• gas (integer): The estimated gas amount
• userOps (array): Array of encoded UserOperations
• error (string, nullable): Error message if estimation failed

Example Request

See Execute Operation for request examples.

Use Cases

• Gas optimization: Estimate gas before execution to optimize costs
• User experience: Show users estimated gas costs before confirming transactions
• Batch operations: Estimate gas for multiple operations
• Pre-execution validation: Verify operations will succeed before execution

Best Practices

1. Always estimate first: Estimate gas before execution for better user experience
2. Handle estimation failures: Check for errors in the response
3. Use encoded operations: Use the encoded UserOperations from this endpoint with execute encoded
4. Monitor gas trends: Track gas estimates over time for optimization

Related Endpoints

• Execute Operation - Execute operations directly
• Execute Encoded - Execute using encoded UserOperations from this endpoint