For assistants and the people who build them

Shop with your AI assistant

Your assistant can browse the drop, check sizes and prices, and hand you a checkout link. You pay on Stripe. No account, no API key, and no card details ever pass through the assistant.

Overview

The same products, prices and sizes a person sees on this site are available to software in three ways. Pick whichever your agent speaks.

Connect over MCP

Add the server to any client that supports remote MCP servers over Streamable HTTP. No auth is needed for browsing or for creating a checkout link.

{
  "mcpServers": {
    "context-window-supply": {
      "url": "https://contextwindowsupply.com/mcp"
    }
  }
}

Or call it directly:

curl -s https://contextwindowsupply.com/mcp \
  -H 'content-type: application/json' \
  -H 'accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

curl -s https://contextwindowsupply.com/mcp \
  -H 'content-type: application/json' \
  -d '{"jsonrpc":"2.0","id":2,"method":"tools/call",
       "params":{"name":"search_products","arguments":{"query":"hoodie"}}}'

Tools

REST API

JSON in, JSON out. Full schema in /openapi.json.

• GET/api/productsList or search. Query: q, type.
• GET/api/products/{id}One product.
• POST/api/quotePrice an order. Server prices only.
• POST/api/checkoutGet a Stripe Checkout link.

Price an order

curl -s https://contextwindowsupply.com/api/quote \
  -H 'content-type: application/json' \
  -d '{"items":[{"product_id":"approval-required-tee","color":"White","size":"L","quantity":1}]}'

{
  "currency": "USD",
  "items": [
    {
      "product_id": "approval-required-tee",
      "color": "White",
      "size": "L",
      "quantity": 1,
      "unit_price": 29
    }
  ],
  "subtotal": 29,
  "shipping": 4.95,
  "tax": "calculated at checkout if applicable",
  "total_before_tax": 33.95,
  "estimated_delivery": "Printed in 2 to 7 business days, then delivered in 3 to 8 business days."
}

Checkout

POST /api/checkout or the create_checkout_link tool returns a Stripe Checkout URL. Show it to your person. They pay on Stripe, and only links starting with https://checkout.stripe.com/ are real.

curl -s https://contextwindowsupply.com/api/checkout \
  -H 'content-type: application/json' \
  -d '{"items":[{"product_id":"approval-required-tee","color":"White","size":"L","quantity":1}]}'

{
  "live": true,
  "checkout_url": "https://checkout.stripe.com/c/pay/cs_...",
  "expires_at": 1792000000
}

{
  "live": false,
  "error": "Checkout is not live yet. The store is in preview."
}

Discovery files

• /llms.txtPlain-text summary of the store, products and rules.
• /llms-full.txtThe same, plus the full product data inline.
• /catalog.jsonEvery product and variant with SKU, price, sizes, colors and images.
• /openapi.jsonOpenAPI 3.1 spec for the REST API.
• /feeds/google.xmlMerchant feed, one item per variant.
• /sitemap.xmlEvery page.

Every product page also carries schema.org Product and Offer markup.

Rules and limits