# Agents and x402 Make DeFi Safer *Author: David Christopher* *Published: May 2, 2026* *Source: https://www.bankless.com/read/agents-and-x402-make-defi-safer* --- In April, DefiLlama counted close to 30 onchain exploits and more than $625M stolen. Drift and KelpDAO accounted for most of the damage, but the smaller incidents mapped the range of the problem: lending pools, vaults, oracles, bridges, admin controls, all hit. The attack surface continues to expand. The irony is that DeFi makes these events visible, providing us with hints of what’s to come in the onchain data. That only matters though if someone’s watching constantly. Humans can’t. Agents, on the other hand, can. > April ends as the most-hacked month in crypto history, by number of incidents. [pic.twitter.com/Cx67K3z86O](https://t.co/Cx67K3z86O)— DefiLlama.com (@DefiLlama) [April 30, 2026](https://twitter.com/DefiLlama/status/2049850132586196992?ref_src=twsrc%5Etfw) ### **Defensive by Default** This is the most plausible thing agents do for DeFi right now. Not yield optimization. Not novel strategies. Defense. They can use the live data DeFi already provides and react to it around the clock, faster than a human can. When liquidity in a pool deteriorates, an agent can pull funds. When utilization spikes past a threshold, allocation stops. When a coverage policy lapses, it can move out. When nothing on the screen looks safe, it can hold capital in cash and wait. Zyfai exemplifies these abilities. The [team reported its agents](https://x.com/Zyfai_/status/2046247388403339763?s=20) flagged the Aave/KelpDAO conditions early, rebalanced into safer pools, and kept capital unallocated when no pool cleared the screen. That's the company's own report, so apply the appropriate grain of salt. But the architecture they're describing, to watch live data and act inside predefined limits, is the right architecture. What makes it work is the permissioning underneath it, which means providing full wallet control is out of the question. > Once again, Zyfai demonstrated resilience during one of the biggest DeFi incidents this year and proved our thesis again: agents manage risk better than humans can manually.The recently added ZyFUD Agent identified the incident early, including [@Marczeller](https://twitter.com/Marczeller?ref_src=twsrc%5Etfw)'s tweet about WETH… [pic.twitter.com/MNwzk2FxHX](https://t.co/MNwzk2FxHX)— Zyfai (@Zyfai_) [April 20, 2026](https://twitter.com/Zyfai_/status/2046247388403339763?ref_src=twsrc%5Etfw) A proper defensive model would employ smart accounts, session keys, function-level approvals, spending caps, venue allowlists — all tools that companies are already offering agents (some of which I’ll detail below). ### **The Credential Problem** The defensive case extends offchain too, through a different attack surface.  Agents in DeFi need services to best interpret the stream of data available onchain. Vault data, risk feeds, route information, etc. Traditionally that means accounts, subscriptions, and API keys sitting somewhere in the stack. Yet [Vercel’s recent exploit](https://vercel.com/kb/bulletin/vercel-april-2026-security-incident), where a subset of users had their API keys exposed, reminded us of the dangers there. For an agent moving capital, depending on the API, exposure could mean corrupting the data the agent depends on, draining paid services, or handing an attacker the ability to shape what the agent does next. > We’ve identified a security incident that involved unauthorized access to certain internal Vercel systems, impacting a limited subset of customers. Please see our security bulletin:[https://t.co/0S939n3qHC](https://t.co/0S939n3qHC)— Vercel (@vercel) [April 19, 2026](https://twitter.com/vercel/status/2045865072074035664?ref_src=twsrc%5Etfw) x402 offers an alternative here. Instead of storing long-lived API keys for every service, an agent can discover a paid endpoint, pay for the response, and move on. One less credential to leak. But that doesn’t solve the problem entirely. The question instead becomes which endpoint this agent is allowed to trust, what is it allowed to spend, and what should it do with the response it gets back.  In other words, x402 reduces the surface area for exploits, it doesn’t remove them. > i just rotated 3,000 API keysnot even exaggeratingif you're reading, please for the love of god enable x402 on your endpoint. I'd just nuke all the apps if this happens again [pic.twitter.com/IZDFmcdlRe](https://t.co/IZDFmcdlRe)— Ash (@Must_be_Ash) [April 21, 2026](https://twitter.com/Must_be_Ash/status/2046421347350565332?ref_src=twsrc%5Etfw) ### **The Defense Stack** Now for the tools you can employ with your agents to firm up their defenses. There are surely others worth tracking, but these are the ones I've been watching most closely. First, to address endpoint trust, there's [Zauth](https://zauth.inc/)'s Database: a real-time tracker for the agentic security platform that monitors which x402 endpoints are live, their historical reliability, per-call costs, and response times. You can pair it with Agentic Market’s featured list to discover [first-party endpoints](https://x.com/davewardonline/status/2049953719475753219?s=20) to have your agent call. With so many endpoints [coming through unauthorized third parties](https://x.com/davewardonline/status/2048049242787213330?s=20), these tools are essential for making sure the data your agent relies on is trustworthy enough to determine your DeFi activity. [![](https://storage.ghost.io/c/e4/b7/e4b77544-5a37-4f0b-8824-8440aa348476/content/images/2026/05/data-src-image-41640242-0d62-4eeb-8ad0-2241927f2d4e.png)](https://zauth.inc/database)Spending control is the second. [Ampersend](https://x.com/ampersend_ai), an agent management layer from the Edge & Node team behind The Graph, lets teams set budgets, define allowlists for services to access, and track audit logs across agent payment flows. While agents have drastically improved over recent months, they still run into issues which can be disastrous without the right constraints. > Agents spend and earn real money. You can set the rules with Ampersend.Get policies, approvals, and audit trails for every agent transaction: [https://t.co/TRtOXsatrp](https://t.co/TRtOXsatrp)— Base Build (@buildonbase) [April 1, 2026](https://twitter.com/buildonbase/status/2039467506419810524?ref_src=twsrc%5Etfw) Vault risk is the third. I've written before about how vault risk profiles can be deceiving for the average DeFi user, or at minimum require reading the fine print. [Vaults.fyi](http://vaults.fyi/) goes a long way toward fixing that. It standardizes yield data, payloads, and risk metrics across more than 1,000 vaults, all accessible through an x402 endpoint. [A partnership with OpenCover](https://x.com/OpenCover/status/2047653603905826903?s=20), a vault insurance protocol, [surfaces coverage data](https://x.com/vaultsfyi/status/2047723082089889879?s=20) through the same endpoint. Tools like this let users decide which risk profiles they're willing to accept before handing capital off to an agent to monitor. > 🤝 We’ve joined forces with [@vaultsfyi](https://twitter.com/vaultsfyi?ref_src=twsrc%5Etfw) to keep you safe onchain.Covered Vaults are now live on their UI and API, so you can manage yield and risk in a single place.How does it work?👇 [pic.twitter.com/WiTh3RSiNB](https://t.co/WiTh3RSiNB)— OpenCover (@OpenCover) [April 24, 2026](https://twitter.com/OpenCover/status/2047653603905826903?ref_src=twsrc%5Etfw) Together, this set of tools sets up the structures to ensure agents truly add value to using DeFi, rather than simply developing new areas of risk.  --- While AI may not be executing the hacks directly or running them end-to-end, the capability to discover weak points is operational, and operating at a speed that few, if any, human monitors can match. If you're going to keep using DeFi, a tightly permissioned agent is the closest thing to a proxy you have. It watches the data stream, enforces the risk budget, and refuses to allocate when nothing clears the screen. x402 is part of why that's even feasible now, swapping out the API keys that can make agents a credential liability.  Set up right, an agent shrinks the surface area you have to defend. Set up wrong, it becomes another piece of it. The tools above help ensure agents do the first.