◆ Smart Contract Code Review

Ship Solidity. Not vulnerabilities.

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Vault.sol● auditing...
pragma solidity ^0.8.19;
 
contract Vault {
  mapping(address => uint256) balances;
 
  function withdraw(uint256 amt) external {⚠ reentrancy
    require(balances[msg.sender] >= amt);
    (bool ok,) = msg.sender.call{value: amt}("");↑ external call first
    require(ok);
    balances[msg.sender] -= amt;↑ state update after call
  }
}
2 critical · 1 warning✓ auditor connected

👤

Alex R.

Senior Auditor · online

◆ Reentrancy Guard◆ Access Control◆ Integer Overflow◆ Flash Loan Attack◆ Front-running◆ Unchecked Return Value◆ Delegatecall Injection◆ Price Oracle Manipulation◆ Gas Griefing◆ Signature Replay◆ Reentrancy Guard◆ Access Control◆ Integer Overflow◆ Flash Loan Attack◆ Front-running◆ Unchecked Return Value◆ Delegatecall Injection◆ Price Oracle Manipulation◆ Gas Griefing◆ Signature Replay

◆ How it works

From repo URL to live review in under an hour.

STEP 01

⬆

Submit your project

Share your GitHub repo link and your hackathon deadline. We scan for complexity and match you with the right auditor.

STEP 02

⚡

Get matched instantly

Paired with a senior auditor within minutes. They specialize in your stack — DeFi, NFTs, bridges, whatever you're building.

STEP 03

⚙

Review live, together

1-on-1 screen share. Real-time inline feedback. They walk through your code, flag vulnerabilities, suggest fixes on the spot.

◆ Why it matters

Most hackathon contracts never get audited. Yours will.

The gap between “it works” and “it's secure” is where $700M has been exploited in DeFi. A one-hour session with a seasoned auditor closes that gap — before judges (or attackers) find your bugs first.

✓Real-time fixes, not a report you can't act on

✓Auditors who've found bugs on Code4rena & Sherlock

✓No long-form engagement — just the hour you need

session.log
// Session started — 14:32 UTC
[auditor] Checked your withdraw flow.
[auditor] Line 48 — reentrancy. External
          call before state update.
[you]     Oh damn, how do I fix it?
[auditor] Add nonReentrant modifier from
          OZ ReentrancyGuard. Like this:
          import ReentrancyGuard;
          is ReentrancyGuard {
[auditor] Also update state BEFORE the
          call. CEI pattern.
[you]     Fixed! Anything else?
[auditor] Looks clean now. Let's check
          the access control next...

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