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.

7 starsTesting & QA

Install

skills CLI (Claude Code, Cursor, Codex and more)
npx skills add zincio/skills --skill universal-checkout
Manual install
git 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-checkout

Personal 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`.
Read the full skill on GitHub

Details

Skill name
universal-checkout
Repository
zincio/skills
Path
skills/universal-checkout/SKILL.md
License
MIT
Repo updated
27 October 2026

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.

Related skills

Dpia Generator

9

wnallen/dpia-generator

Use whenever the user wants to run, draft, or stress-test a Data Protection Impact Assessment or any jurisdiction's equivalent for a new or modified processing. Triggers: "run a DPIA on", "assess privacy risk for", "is this Article 35 / high risk?", "need a Colorado data protection assessment / LGPD RIPD / PIPL PIPIA / Law 25 PIA?", any new-processing description (tool, vendor, AI feature, monitoring) with a privacy-risk question, or a pasted vendor page with a GDPR/ICO/CNIL/EDPB/CPPA/ANPD question. Also "index our privacy notice" — a portable notice profile later runs check for policy drift.

Testing & QA

Arduino Firmware Building

8

nguyentoanthang/arduino-firmware-building

Use this skill when the user wants to design, build, upload and test firmware for any Arduino-compatible board end to end with arduino-cli: identifies the board and FQBN via cli search, requires user-provided board/library documentation, validates requirements, writes plan and comprehensive test spec (including edge cases, boundary limits, negative inputs, and fault resilience), stops for user review & approval, implements functional code and test cases via two parallel subagents followed by a third integration & compilation subagent, uploads with user-assisted bootloader/reset steps, captures

Testing & QA

Autoreg

7

Ikhdev1/autoreg-agent-skill

Build and run automated service registrations end to end: recon a signup flow, generate an adapter, drive real Chromium/Gecko with a persistent identity, read email OTP codes, solve or inject CAPTCHA tokens, route through proxies, and verify accounts. Use this skill whenever the user asks to auto-register or mass register on a service, create accounts, automate signup/registration, bypass browser fingerprint checks, wire temporary mail or SMS, or turn a manual signup flow into a repeatable script — even if they do not say "autoreg". Also use it for QA/test-account provisioning and for debuggin

Testing & QA

Jest

9

anivar/jest-skill

Jest best practices, patterns, and API guidance for JavaScript/TypeScript testing. Covers mock design, async testing, matchers, timer mocks, snapshots, module mocking, configuration, and CI optimization. Baseline: jest ^30.5.2. Triggers on: jest imports, describe, it, test, expect, jest.fn, jest.mock, jest.spyOn, mentions of "jest", "unit test", "test suite", or "mock".

Testing & QA

Supertest

8

renanmpimentel/supertest

Use when creating, changing, running, or auditing unit and integration tests, investigating tests that pass without observing outcomes, or analyzing application mutations and Necessist findings.

Testing & QA

Healthsim

9

mark64oswald/healthsim-workspace

HealthSim generates realistic synthetic healthcare data for testing EMR systems, claims processing, pharmacy benefits, and analytics. Use for ANY request involving: (1) synthetic patients, clinical data, or medical records, (2) healthcare claims, billing, or adjudication, (3) pharmacy prescriptions, formularies, or drug utilization, (4) HL7v2, FHIR, X12, or NCPDP formatted output, (5) healthcare testing scenarios or sample data generation.

Testing & QA

Browse the most popular Claude skills, all testing & qa skills, or write your own with the skills generator.