How to Prevent AI Agent Fraud
Agent fraud is unauthorized spend — from stolen keys, injected instructions, or abused tools. The prevention stack is deterministic.
The fraud shapes
Credential abuse: a leaked key spending as your agent.
Injection-driven payments: instructions in content trigger purchases.
Tool abuse: a compromised tool spends beyond intent.
The prevention stack
Scoped keys per agent — limit the blast radius.
Merchant allowlists — unknown destinations default-deny.
Caps and velocity limits — bound and slow the damage.
Audit log — attribution for every decision.
FAQ
What's the most common fraud?
Credential abuse and injection-driven spend — both bounded by the same rules.
Can the firewall prevent all fraud?
It prevents unauthorized SPEND. A stolen key still needs rotation — caps limit the window.
Related
Stop the next $12,400 night.
One API call (or MCP tool) in front of every agent transaction — APPROVED, BLOCKED, or FLAGGED, deterministic, ~5 ms, fully logged.
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