The postOp function is called by the EntryPoint on the paymaster contract after user operation execution, often used for additional accounting logic.
The paymaster contract’s postOp function has reverted unexpectedly.

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Resolution Strategies

  1. For Custom Paymaster Contracts:
    • Review and correct the postOp function implementation
    • If not using postOp, ensure the context parameter is not set in validatePaymasterUserOp
  2. For Third-Party Paymaster Services:
  3. Advanced Troubleshooting:
    • Investigate postOp reversion causes using tools like Tenderly