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Improper/Missing L2 Sequencer Check

What it detects​

This detector highlights protocols that assume L2 sequencers are always available. Without checking a heartbeat or oracle, withdrawals or price feeds may be incorrect during sequencer downtime.

Typical symptoms​

  • No call to sequencer status oracle
  • L2 rollup assumptions baked into core logic

Solidity snippet (v0.8.25)​

pragma solidity ^0.8.25;

contract RollupClient {
    function readPrice() external view returns (uint256) {
        // No sequencer status check
        return 0;
    }
}

Why it matters on EVM​

Ignoring sequencer liveness risks invalid data or stuck withdrawals when the rollup network halts.