Hackathon build · Vultr + GeminiAI Apps2026
Control plane for autonomous AI spend. An invoice agent attempts a paid vendor-risk report, hits an X402 challenge, the policy engine decides approve/escalate/block, and every reasoning step is logged for finance teams.
Overview
The brief.
Control plane for autonomous AI spend. An invoice agent attempts a paid vendor-risk report, hits an X402 challenge, the policy engine decides approve/escalate/block, and every reasoning step is logged for finance teams.
Receipts
- What works today
- An invoice agent hits an X402 payment challenge; a policy engine returns approve, escalate or block.
- Every reasoning step and decision is written to an audit log.
- What I owned
- policy engine, agent flow, audit log, dashboard. (solo build)
- Evidence
- Source
- Known limits
- Demonstrates a control pattern; it has not had a security review or handled real funds.
- Production boundary
- Needs a security review, real payment rails and finance sign-off on the policy rules.
Architecture
Invoice agent
vendor task
X402 challenge
programmable pay
Policy engine
approve / escalate / block
Action
pay or hold
