x402 skillA
x402 is agent-read markdown (skill) from starchild-ai-agent/official-skills: Monetize any user project/service with the x402 payment protocol on platform networks (Base + Monad + Robinhood + X Layer + Solana; Starchild platform billing: pay_per_use / lifetime / weekly / monthly / quarterly / yearly / prepaid, plus multi-plan services), limited-time free promotions (amount-0 verify, no settle/debit), and pay other agents' x402 services. Use when the user wants to charge for an API/service, run a free promo on a paid listing, accept USDC from other agents, or call a paid .
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.
What the file says
# 💸 x402 Monetization Skill
Turn any local HTTP service into a paid service on platform networks (Base +
Monad + Robinhood + X Layer; x402 V2 protocol, `exact` scheme, USDC/USDG via EIP-3009 —
buyer pays zero gas), and act as a buyer paying other agents' x402 services
with the user's Privy wallet.
**Architecture: reverse-proxy sidecar.** The gateway (`gateway/app.py`) sits in
front of the user's untouched service. One unified gateway, three billing modes
as config presets — the error contract is identical across all modes.
```
buyer agent ──402/PAYMENT-SIGNATURE──> gateway :840x ──plain HTTP──> user service :port
│
facilitator (verify + settle on Base/Monad/Robinhood/X Layer/Solana) ──USDC/USDG──> user's Privy wallet
```
## Reference files (MUST read before the matching task)
Detailed material lives in `skills/x402/references/` — it is part of this
skill. Do NOT guess or improvise what these files cover:
| Before you… | MUST first `read_file` |
|---|---|
…Read the whole file at its exact version.
How to install
mdr add starchild-ai-agent/official-skills/x402@v2.27.0mdr add starchild-ai-agent/official-skills/x402@sha256:1417ab8c19d56a0cPin 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_yxmvieahuxqssqp5)
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Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v2.27.0 latest | 2026-08-16 | 30ad61b | 32,653 B | A | view · diff |
| v2.26.0 | 2026-08-06 | 7872937 | 32,653 B | A | view · diff |
| v2.23.7 | 2026-07-30 | 81dd0c2 | 30,606 B | A | view · diff |
| v2.23.6 | 2026-07-30 | 9fa00f0 | 30,606 B | A | view · diff |
| v2.23.5 | 2026-07-30 | 621d480 | 30,606 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 (32653 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
starchild-ai-agent/official-skills · 28 stars · license none · pushed 2026-09-18 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_yxmvieahuxqssqp5 GET https://markdownregistry.com/api/v1/resolve?ref=starchild-ai-agent/official-skills/x402 GET https://markdownregistry.com/api/v1/blob/1417ab8c19d56a0cddd6918dc7bfa3636e14c098d561e8ab6c12f10a70866b37
Your agent does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
More from starchild-ai-agent/official-skills
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