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The Universal Checkout Skill is an Agent Skill that lets AI agents shop through the Zinc API — search for products, place orders, track them, and handle returns across Amazon, Walmart, Target, Best Buy, eBay, and 50+ other US retailers, all through natural language.

Order anything

Visual search

Handle complex tasks

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What is an Agent Skill?

An Agent Skill is a declarative specification (a SKILL.md file) that teaches AI agents how to interact with an API. There’s no executable code — the skill provides instructions, endpoint definitions, and safety guidelines that the agent follows. Agent Skills use progressive disclosure: at startup only the skill name and description are loaded. The full instructions are read into context only when the agent detects a matching task, keeping your agent fast and focused.

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One skill, or one per retailer

The skill comes in two flavors, both from the same zincio/skills catalog:
  • universal-checkout — the full lifecycle across every supported retailer. Install this for general use.
  • Per-retailer skills (amazon-checkout, walmart-checkout, target-checkout, …) — the same lifecycle retargeted for a single store. Handy when an agent only ever buys from one retailer.
Installing several near-identical per-retailer skills in one agent can make skill triggering ambiguous. If you buy across retailers, install universal-checkout rather than stacking retailer skills.

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What Can It Do?

Placing an order or opening a return spends real money. The agent always confirms with you before submitting.

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Two ways to pay

The skill supports either authentication method — pick based on how the user wants to pay: With MPP, the same /agent/* endpoints handle both ordering and metered data calls ($0.01/call), so an agent can discover and buy with no account at all. Try it without code at agent.zinc.com.

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Supported Platforms

Works with any agent platform that supports the Agent Skills standard, including:

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Prerequisites

You’ll need one of:
  1. A Zinc API key (sign up at app.zinc.com) with funds deposited, or
  2. An MPP payment method — a funded Tempo wallet key (TEMPO_PRIVATE_KEY) or a Stripe payment method. No Zinc account required.

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Using a chat client instead?

If your agent is a chat client — Claude, ChatGPT, Cursor — the Zinc MCP server covers the same ground with no install and no API key: paste one URL, sign in with your Zinc account, and each step renders as an interactive card you click to confirm. The skill remains the better fit for coding agents, headless automation, and buying with no Zinc account at all over MPP.

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Next Steps

Setup

Install and configure the skill for your platform.

Usage Guide

Discover products, place orders, track them, and handle returns.