universal-checkout skillA
universal-checkout is agent-read markdown (skill) from zincio/skills: Discover, buy, track, and return products across Amazon, Walmart, Target, Best Buy, eBay, and 50+ other US retailers via the Zinc API (zinc.com). Use when the user wants to search for or buy a product, check out, check order status or tracking, cancel an order, or return an item programmatically. Supports API key auth (ZINC_API_KEY) or Machine Payments Protocol (MPP) for per-request payments via a Stripe card (Stripe Link), Tempo stablecoins, or x402 (USDC on Base)..
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
How to install
mdr add zincio/skills/universal-checkout@git:20260810.feed32emdr add zincio/skills/universal-checkout@sha256:10bb03eba4627e2fPin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_lbabg5vr2mrmful4)
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Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260810.feed32e latest | 2026-08-10 | feed32e | 14,217 B | A | view · diff |
| git:20260728.9ecb238 | 2026-07-28 | 9ecb238 | 14,213 B | A | view · diff |
| git:20260710.bd81d31 | 2026-07-10 | bd81d31 | 14,142 B | A | view · diff |
| git:20260629.f3ce9dc | 2026-06-29 | f3ce9dc | 17,343 B | A | view · diff |
| git:20260628.b7ff2d7 | 2026-06-28 | b7ff2d7 | 17,277 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (14217 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
zincio/skills · 7 stars · license MIT · pushed 2026-09-01 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_lbabg5vr2mrmful4 GET https://markdownregistry.com/api/v1/resolve?ref=zincio/skills/universal-checkout GET https://markdownregistry.com/api/v1/blob/10bb03eba4627e2f4f45aa25f2c545f0090947abe1b35347fd5c3acb3be20303