MPP Bazaar 🌯

March 19, 2026 · View on GitHub

A food truck ordering API where AI agents browse, build a cart, and pay dynamic totals using the Machine Payments Protocol.

Why This Matters

x402 only supports static pricing — every request costs the same. Real commerce needs dynamic, computed totals: combo discounts, bulk pricing, tax calculations. MPP Bazaar demonstrates this with a fun food truck API.

Agent: "I want 2 Quantum Burritos + Stack Overflow Fries + Sudo Soda"
Server: "That's \$33.00 - \$4.50 combo discount + \$2.53 tax = \$31.03"
Agent: *pays exactly \$31.03 via Tempo*
Server: "Order ORD-1001 confirmed!"

Quick Start

npm install
npm run dev
# Open http://localhost:8787 for the UI

Test with mppx CLI

# Create a testnet wallet
npx mppx account create

# Place an order (agent-style)
npx mppx http://localhost:8787/api/order \
  -X POST \
  -d '{"items":[{"id":"quantum-burrito","qty":1},{"id":"stack-fries","qty":1},{"id":"sudo-soda","qty":1}]}'

Deploy

npx wrangler deploy

API

Method	Path	Auth	Description
GET	`/api/menu`	None	Full menu with prices
POST	`/api/preview`	None	Price breakdown without payment
POST	`/api/order`	MPP	Place order, pay dynamic total
GET	`/api/orders/recent`	None	Last 10 orders

Pricing Engine

The server computes every total dynamically:

Combo discount (15%): Order a Main + Side + Drink together
Bulk discount (10%): Any item with qty >= 3
SF Tax (8.875%): Applied after discounts

Architecture

┌─────────────┐     ┌──────────────┐     ┌─────────────┐
│  Agent/CLI  │────>│  Hono API    │────>│  Pricing    │
│  (mppx)     │<────│  + MPP/Tempo │<────│  Engine     │
└─────────────┘     └──────────────┘     └─────────────┘
                           │
                    ┌──────┴──────┐
                    │  Frontend   │
                    │  (vanilla)  │
                    └─────────────┘

Stack

Runtime: Cloudflare Workers
Framework: Hono
Payments: mppx + Tempo (pathUSD)
Frontend: Vanilla HTML/CSS/JS (no frameworks)

Item	Price	Category
Quantum Burrito	$12.50	Main
Neural Noodles	$10.00	Main
Binary Burger	$14.00	Main
Pixel Pizza Slice	$6.00	Main
Algo Tacos (3-pack)	$11.00	Main
Hash Browns	$4.50	Side
Stack Overflow Fries	$5.00	Side
Recursive Onion Rings	$6.50	Side
Sudo Soda	$3.00	Drink
Kernel Kombucha	$5.50	Drink
Null Pointer Espresso	$4.00	Drink
Cookie Cache	$3.50	Dessert

License

MIT