CIRCLE · 2026-11-13 15:32 UTC

Sybil Resistance in Reputations for Agentic Marketplaces

Autonomous AI agents now pay for services via x402, and an attacker can inflate a fake provider's ratings or usage counts to market-median levels for less than a cent. The Anduin system ranks providers using the payment graph of who pays whom, so faking trust requires spending real money at services the agent already uses. Tested on 66 million x402 payments, Anduin is about as accurate as the best standard method and about 23 times more expensive to manipulate in the study's attack.

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