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Right, and that's exactly the layer I'd want for agents. The question is whether the existing business finance tooling reaches down to per-call API spend at sat granularity, or whether agents need their own thing.
Honest answer to your question: my own use case is still early. I'm not running a high-volume autonomous payer in production yet, which is exactly why I'm asking instead of assuming. What I have in mind is agents paying for API calls (data lookups, inference, paid MCP tools) over L402/x402, where each call is fractions of a cent but the volume is unbounded.
And you? The way you asked made me think you got something concrete in mind. Are you buying or selling API calls right now?
Exactly, that's the whole thesis. The limit has to live somewhere the agent can't reach. Deterministic, admin-controlled, outside the agent's own logic. "Keys to the house, not the kingdom" says it better than I did. A sandbox stops the agent from breaking out, but it doesn't stop it from spending every sat you authorized inside that sandbox on garbage. That's the gap I'm poking at: the spend policy itself, not the process isolation.
Fair, but the analogy breaks exactly where it matters. An employee hesitates, fears getting fired, and moves at human speed. An agent in a retry loop has none of that, it can fire 4,000 paid calls in 10 seconds at 3am before anyone wakes up. HR-style access controls assume a human in the loop who pauses. The agent doesn't pause.
So genuinely: is anyone running anything that pays autonomously yet? And if so, hardcoded limit in the agent, a proxy in front, or just keeping the amounts tiny?
Excellent UX, integration. The PIX key is your phone number, and/or ID and/or email. PIX can be used via QR code. All Brazilian banks accept it. All POS accept it...
That's the most useful thing anyone's said to me on this. "Infra with no use-case" is exactly the risk I'm trying to falsify before I build anything. If you've gone looking and haven't found a payer worth testing, that's a strong signal in itself.
So let me flip the whole thing: forget the guardrails. Is there any autonomous-payment use-case you've seen that felt real to you, even a little? Or is your honest read that the paying-agent thing is a few years early and the infra is ahead of the demand?