Zinc Universal Checkout

Zinc Universal Checkout

Zinc Universal Checkout is an Agent Skill that teaches compatible agents how to use the Zinc API (https://api.zinc.com) for the full US shopping lifecycle: discover products, place orders, track shipments, cancel queued orders, and open returns. One integration covers Amazon, Walmart, Target, Best Buy, eBay, Home Depot, Lowe's, Wayfair, and 50+ other US retailers. The live retailer catalog is GET https://api.zinc.com/retailers (free, no auth). Product discovery uses GET /search (or metered POST /agent/search on the payment rail) and returns directly orderable product URLs. Orders go to POST /orders or POST /agent/orders; tracking, cancel, and returns use GET /orders/{id}, POST /orders/{id}/cancel, and POST /returns.

Authentication

Pick one method:

• API key: set ZINC_API_KEY from app.zinc.com and send Authorization: Bearer $ZINC_API_KEY to /orders and related endpoints. This is the standard flow for a funded Zinc account.
• MPP (Machine Payments Protocol): no Zinc account required. Pay per request via Stripe Link (cards/wallets), Tempo stablecoins (TEMPO_PRIVATE_KEY), or x402 (USDC on Base). Agent endpoints live under /agent/*. Data calls such as search are typically $0.01 each; GET /retailers is free. Try the flow without code at agent.zinc.com.

Amounts are in US cents (5000 = $50.00). Required order fields include a product URL, a US shipping address, and max_price.

Safety

Always confirm with the user before placing an order or opening a return — both spend real money. Search, order listing, and tracking reads are safe. max_price is the total ceiling in cents, including item price, tax, and shipping/handling, not the item subtotal. A value that omits shipping trips max_price_exceeded. On the MPP rail, Zinc authorizes max_price + $1 (the API fee) on the payment method.

Upstream install and per-retailer skills

The canonical catalog is zincio/skills. For general shopping across retailers, install the upstream skill:

npm exec --package=skills@1.5.7 -- skills add zincio/skills --skill universal-checkout

Per-retailer skills also exist (amazon-checkout, walmart-checkout, target-checkout, bestbuy-checkout, ebay-checkout, and others). Use those only when the agent should buy from a single store. Do not stack several near-identical retailer skills — overlapping descriptions make triggering ambiguous. Prefer universal-checkout when buying across stores.

Support

• Email: support@zinc.com
• Docs: https://www.zinc.com/docs/v2/agent-skills/overview

Installation

No source-backed install or usage instructions could be extracted automatically. Review the upstream project before running this skill in a sensitive workflow.

• Source: https://github.com/zincio/skills/tree/master/skills/universal-checkout