Governance layer for Stripe agent payments — commerce delegation, spend limits, merchant allowlists, audit trail

[aeoess]

Governance layer for Stripe agent payments — APS commerce delegation

Stripe handles money movement. Governance handles who authorized it, within what limits, and produces the audit trail. Neither replaces the other.

The gap

The Agent Toolkit uses Restricted API Keys (RAKs) to control which Stripe APIs an agent can call. RAKs are static, dashboard-configured, and don't answer:

• Who authorized this specific agent to make this specific purchase?
• What's the per-task spending ceiling, not just the API key's scope?
• Which merchants is this agent allowed to transact with?
• Does a human need to approve above a threshold?
• Can we trace this payment back to the human who delegated authority?

What we built

Agent Passport System (Apache 2.0, 2,306 tests) ships a commerce delegation layer that answers all five. We built a governance adapter that wraps the Stripe Agent Toolkit:

Agent wants to pay
       │
       ▼
  APS 4-Gate Preflight
  1. Passport valid?      ← Ed25519 agent identity
  2. Scope authorized?    ← Delegation includes commerce
  3. Budget remaining?    ← Per-delegation spend tracking
  4. Merchant allowed?    ← Allowlist check
       │
  All pass → Stripe processes payment
  Any fail → Blocked, signed receipt emitted
       │
       ▼
  Signed ActionReceipt
  (links payment → delegation chain → human principal)

Works with:

• Stripe Agent Toolkit (LangChain, CrewAI, Vercel AI SDK)
• Stripe MPP (Machine Payments Protocol)
• Stripe x402 (USDC micropayments on Base)
• Stripe SPTs (Shared Payment Tokens)

Demo

npm install agent-passport-system
npx tsx examples/stripe-governance/demo.ts

Output shows four scenarios: auto-approved payment, human-approval-required, unauthorized merchant (blocked), and budget exhaustion (blocked).

Integration surface

The adapter wraps toolkit.getTools() with governance checks:

import { governStripeTools } from 'agent-passport-system/examples/stripe-governance'

const governedTools = governStripeTools(toolkit.getTools(), {
  passport: agentPassport,
  delegation: commerceDelegation,
  onHumanApprovalRequired: async (req) => notifySlack(req),
  onReceipt: (receipt) => auditLog(receipt),
})

For MPP payments:

const result = await governMPPPayment(config, {
  amount: 4999, currency: 'usd',
  merchant: 'api.openai.com',
  resource: 'API credits',
  paymentMethod: 'spt',
})
// result.authorized, result.receipt, result.remainingBudget

What this enables for Stripe

Concern	Stripe	APS
Money movement	✓
Payment processing	✓
Fraud detection (Radar)	✓
Agent identity verification		✓
Per-delegation spend authorization		✓
Merchant allowlisting		✓
Human escalation gates		✓
Cryptographic audit trail		✓

Enterprise buyers deploying agents with Stripe need both layers. Happy to discuss deeper integration or contribute directly.

Adapter source: https://github.com/aeoess/agent-passport-system/tree/main/examples/stripe-governance
SDK: npm install agent-passport-system (v1.34.0)
Paper: https://doi.org/10.5281/zenodo.19260073

[jagmarques]

Signed audit trails for payment delegation make a lot of sense here. The challenge is proving which agent authorized which transaction after the fact. Post-quantum signatures on each delegation step create non-repudiable receipts that hold up to scrutiny. This is the pattern we use in asqav for tool-call governance.

[aeoess]

@jagmarques — the non-repudiable receipt chain is exactly what this delivers. Every APS commerce receipt carries delegationId → agentId → signature, so you can trace any payment back to the human who delegated authority.

On post-quantum: Ed25519 is the current primitive. The canonical serialization layer means the signature algorithm is swappable without changing the receipt schema. When PQ signing is practical at sub-millisecond latency, the upgrade is at the crypto layer, not the protocol layer.

On your async receipt signing pattern in asqav: we do the same for permits (non-blocking). Denials are signed synchronously because they're the proof-of-restraint that matters most in an audit. The asymmetry makes sense — denials are rare, so the latency cost is negligible in practice.