MARC Protocol is the privacy layer for AI agent payment. It allows agents to conduct confidential transactions on the chain through fully homomorphic encryption (FHE). It includes ERC-7984 encrypted tokens, ERC-8004 agent identity and ERC-8183 agent business (custody, position, reputation) standards. It supports seamless integration of protocols such as x402 and MCP, and provides verifiable on-chain records and automatic release mechanisms.