Build dApps That Actually Work

Yes. Frequently. And the attack methods are specific enough that any vendor answering this with “we take security very seriously” without going further should raise a flag.

Flash loan attacks are one of the nastier ones — a bad actor borrows a massive amount of capital within a single transaction block, manipulates a price feed, profits, and repays the loan before the block closes. The whole thing happens in seconds and leaves no obvious trail. Oracle manipulation is related: your contract gets fed false price data from an outside source and acts on it faithfully, because that’s what it was written to do. Front-running is a quieter threat — bots watch the mempool for pending transactions and insert themselves ahead in the queue to profit from the price movement your transaction is about to cause. Reentrancy bugs, the same family of flaw that drained $60M from The DAO back in 2016, still show up in contracts that went through audit processes in 2024.

Actual protection means an independent audit before mainnet — not internal, not rushed. Time-locks on any admin function that can move funds, so changes can’t happen instantly. Circuit breakers that pause the contract automatically if something statistically strange starts happening with transaction volumes. And active on-chain monitoring after launch, because the window between “something looks off” and “funds are gone” in a live exploit is measured in blocks, not business days. Security is an architecture decision. It can’t be added as a feature at the end of the build.