Note: OOG = “Out Of Gas”
The paymaster’s validatePaymasterUserOp function encountered an issue:
  • It may have reverted unexpectedly
  • It may have exhausted its gas allocation

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Troubleshooting Steps

  1. Gas Limit Check:
    • Increase the verificationGasLimit to cover validatePaymasterUserOp costs
  2. For Custom Paymaster Contracts:
    • Review validatePaymasterUserOp implementation
    • Ensure proper signature verification logic (avoid reverting for invalid signatures)
    • For non-time-based signatures, return uint(1) for invalid signatures
  3. For Third-Party Paymaster Services:
  4. When Not Using a Paymaster:
    • Ensure the paymasterAndData field is not set:
    const opHash = await bundler.sendUserOp({
  paymasterAndData: "0x",
  // Additional operation details...
})
  5. Advanced Debugging:
    • Utilize tools like Tenderly for in-depth analysis