coindesk's coverage of agentcore payments framed it as "payment rails for bots." that's accurate. aws, coinbase, and stripe built the wallet and transaction layer.
what's missing is the control plane.
agentcore gives agents a wallet and a way to pay for apis, mcp servers, and other agents. but there's no native story for budget enforcement, policy checks, or audit trails that survive the session.
here's the problem: if the agent has direct access to the wallet, the agent controls the money. prompt injection, context stuffing, or a multi-turn attack can trick the agent into authorizing payments the user never intended.
you need a gate.
mnemopay's fiscalgate sits between the agent and the wallet. the agent proposes a transaction — destination, amount, reason. fiscalgate checks it against policy: is the destination whitelisted? does the session have budget left? is the amount within limits?
if the checks pass, fiscalgate signs the transaction and forwards it to the wallet. if they fail, the transaction is rejected and logged. the agent never touches the private key.
merkleaudit writes every proposal and decision to a tamper-evident chain. if something goes wrong, you have cryptographic proof of what the agent tried to do.
aws built the rails. now agents need the governance layer that makes those rails safe to use.
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