> ## Documentation Index
> Fetch the complete documentation index at: https://jiffyscan.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# AA51: Insufficient Prefund

> Resolving cases where actual gas cost exceeds prefunded amount

The actual gas cost of the user operation exceeded the prefund provided by the smart account or paymaster.

## Resolution Checklist

1. Gas Limit Adjustment:
   * Try increasing the `verificationGasLimit` for the user operation

2. For Bundler Provider Users:
   * If using `eth_estimateUserOperationGas` (e.g., from JiffyLabs) and encountering this error, [contact their support](https://t.me/JiffyScan)

3. Advanced Analysis:
   * Investigate discrepancies between actual gas cost and prefund using tools like [Tenderly](https://tenderly.co/)