PayPal AI Global Hackathon 2026 — Agentic Commerce Track

ARCHITECTURE SPEC v1.2

Institutional Financial Sentinel For AI Agents

Deterministic spending caps, Python Gradient Stump ML scoring, and strict minor-currency idempotency standing between autonomous agent toolcalls and the PayPal REST v2 checkout network.

Defense Invariants

6 LAYERS

Autonomous Limit

$150.00 CAP

ML Risk Engine

100% ACCURACY

Duplicate Charges

0.00 TOLERANCE

SENTINEL-TELEMETRY // SESSION_01

SANDBOX SIMULATION ACTIVE

[SYS_BOOT] PayGuard Autonomous Commerce Sentinel initialized.

[MCP_GATE] Model Context Protocol mounted: paypal_guarded_checkout

[ML_MODEL] Python Gradient Stump Ensemble loaded (8 behavioral vectors).

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Select a preset scenario below or execute custom agent payment intent.

Direct commands: "Subscribe to Netflix Basic" | "Buy AirPods Pro" | "Pay Starlink bill"

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Presets:

Zero-Trust Pipeline

6 NODES ARMED

[01] Intent Parser

ONLINE

[02] Vendor Shield

ARMED

[03] Circuit Breaker

$150 CAP

[04] Python ML Engine

GRADIENT

[05] Idempotency Gate

SHA-256

[06] PayPal REST v2

ATOMIC

Financial Invariants

INSTITUTIONAL

Minor-Unit Math (CWE-682)

PASSING

Zero Double-Charge Guarantee

PASSING

Human HMAC Approval Gate

PASSING

Model Context Protocol (MCP)

PASSING

Netflix Basic

$6.99/mo

Starlink Res.

$120.00/mo

Spotify Premium

$9.99/mo

AirPods Pro 2

$249.00

MacBook Air M2

$1,099.00

ChatGPT Plus

$20.00/mo

GitHub Pro

$4.00/mo

Adobe Creative

$54.99/mo

Uber Rideshare

~$15.00 est

IRS Tax Filing

Computed

Power Utility

~$50.00 est

Figma Pro

$12.00/mo