Blockchain transactions are irreversible, hard to understand, and expensive to audit, which leaves users choosing between moving fast and risking scams or paying thousands for professional reviews. From honeypots and rug pulls to hidden unlimited approvals that wallets like MetaMask do not clearly surface, everyday users often have no idea what they are actually signing. Vigil changes that by giving you an instant AI powered forensic report on any transaction hash in seconds instead of weeks, for about 1 ADI which is roughly $0.42 instead of $5,000 or more for a traditional audit. It analyzes token flows, contract behavior, and approval risks, then cryptographically signs each report through a 0G Compute Node to ensure it has not been tampered with, while funding its own compute costs through x402 micropayments. Whether you are a retail user approving a swap, a DAO reviewing a treasury move, or a team verifying a token launch, Vigil helps you move quickly while staying safe.

Building Vigil definitely had its "hair-pulling" moments. We started with a persistent "Intrinsic Gas Too Low" error because we were sending ERC-8021 builder codes with our ADI payments. Standard transfers only need 21,000 gas, but that extra data required more "fuel," so we swapped hardcoded limits for dynamic estimation via eth_estimateGas.

Next, our Treasury Ledger kept vanishing. Since the data was only in-memory, every Next.js reload wiped our profits and made the agent look broke. We fixed this with a .treasury-store.json file for local persistence, adding a fallback for Vercel’s read-only serverless environment so it wouldn't crash in production.

Finally, we fought strict TypeScript errors that didn't like how MetaMask handles types, requiring us to explicitly define everything to unblock our Vercel builds. Since we didn't have a 0G Compute Node on hand, we built a cryptographic attestation layer to simulate the verifiable output, keeping our reports tamper-proof and bounty-compliant.