Flat Spending Caps Fall Short of True AI Agent Governance, Experts Warn

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New AI agent payment platforms from AWS Bedrock AgentCore and Coinbase x402 have shipped session-level spending limits, but critics argue these flat caps treat all transactions equally regardless of risk. A $0.02 API call and an $89 third-party agent hire passing through the same approval gate leaves high-risk payments without independent review or audit trails. With MiCA enforcement approaching, regulators can require organizations to demonstrate who approved specific agent-to-agent payments — a question flat limits cannot answer. Researchers and industry observers advocate for autonomy tiering, a governance model that assigns different approval workflows based on transaction amount, category, recipient trust level, and regulatory jurisdiction. Under this framework, routine micro-payments execute instantly while high-value procurements require multi-step human sign-off and full audit records to satisfy compliance requirements.

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