Vitalik Buterin: AI agents may expose user behavior; encrypted privacy is indispensable.

Ethereum co-founder Vitalik Buterin stated on the X platform that with the increasing prevalence of AI agents, cryptographic privacy technologies are crucial for protecting users' API call patterns and behavioral data. Even with local AI agents, if external services can see all search or API call records, they can still infer the user's ongoing activities. Privacy protection needs to be considered at the **full stack** level, with the local AI agent layer being particularly critical. Vitalik likened it to the health and longevity problem: if multiple detrimental factors exist, addressing them one by one will bring cumulative benefits; similarly, measures to reduce the risk of data breaches will produce similar compounding effects. A preliminary solution at present is to forward requests through mixnets to hide the source of access, but service providers may require the introduction of anti-abuse mechanisms and pay-per-call models due to DoS attacks, while in reality, these payment methods often rely on credit cards or stablecoin systems lacking privacy protection.