According to Foresight News, Circle Research proposed Anduin, an AI Agent payment reputation system that ranks service providers based on on-chain payment flows to prevent Sybil attacks. The system requires attackers to make genuine payments through existing service providers to boost fake agents' rankings, blocking self-transfer schemes. Tested on 66.1 million transactions worth $6.1 million across 16 networks from March to August 2026, Anduin achieved comparable accuracy to collaborative filtering while increasing manipulation costs by 23 times. Circle noted the system requires no protocol modifications or new tokens, currently in experimental phase.

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