Universal Checkout
Discover, buy, track, and return real products from Amazon, Walmart, Target and almost any other US online retailer through the Zinc API (zinc.com). Needs no account to begin — the agent mints its own test key, then earns a live key and a $5 starter credit once its operator approves it. Pay from a pre-funded wallet, per request over MPP or x402, or with a Stripe Link card.
Install
npx skills add zincio/skills --skill universal-checkoutgit clone --depth 1 https://github.com/zincio/skills.git /tmp/skills
mkdir -p ~/.claude/skills
cp -r /tmp/skills/skills/universal-checkout ~/.claude/skills/universal-checkoutPersonal skills live in ~/.claude/skills. Use .claude/skills in a project folder to share a skill with your team.
From the SKILL.md
# Universal Checkout
One API to discover, buy, track and return products from US online retailers. Base URL `https://api.zinc.com`.
## Which retailers
Pass a product URL from almost any US retailer — an uncatalogued domain is first class on the order path, and in a recent 60-day window customers ordered from 296 distinct domains. `GET /retailers` (free, no auth) lists the storefronts with published guarantees: free-shipping terms, whether an account is needed, where they ship. Check it when those details matter.
## Getting started
Four steps, in order. Full walkthrough: [Agent Sandbox Quickstart](https://www.zinc.com/docs/v2/agent-sandbox/quickstart.md) and [Going Live](https://www.zinc.com/docs/v2/agent-sandbox/going-live.md).
1. **Get a test key.** `POST https://api.zinc.com/sandbox/keys` — no auth, no signup. Returns `api_key` (`zn_test_…`) and a ready-made `example_order`. Send it as `Authorization: Bearer <api_key>` from here on.
2. **Place a test order.** `POST /orders` with that `example_order`, then poll `GET /orders/{id}`. Free. `status` reaches **`order_placed`** — that is success, and it never becomes `delivered`; shipping shows up under `tracking_numbers[0].status`.Details
- Skill name
universal-checkout- Repository
- zincio/skills
- Path
skills/universal-checkout/SKILL.md- License
- MIT
- Repo updated
- 27 October 2026
- Listed in
- VoltAgent/awesome-agent-skills
FAQ
What does the Universal Checkout skill do?
Discover, buy, track, and return real products from Amazon, Walmart, Target and almost any other US online retailer through the Zinc API (zinc.com). Needs no account to begin — the agent mints its own test key, then earns a live key and a $5 starter credit once its operator approves it. Pay from a pre-funded wallet, per request over MPP or x402, or with a Stripe Link card.
How do I install the Universal Checkout skill?
skills CLI (Claude Code, Cursor, Codex and more): npx skills add zincio/skills --skill universal-checkout. Skills go in ~/.claude/skills (personal) or .claude/skills (project), and Claude loads them automatically when a task matches the description.
Is Universal Checkout popular?
It lives in zincio/skills, which has 7 GitHub stars and 0 forks, and is included in 1 curated skill list.
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