x402-service-buyer SKILL.md skillA
x402-service-buyer from nirholas/three.ws is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add nirholas/three.ws/x402-service-buyer@git:20260922.9a96a70Pins git:20260922.9a96a70 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- nirholas/three.ws
- Path
community-skills/skills/x402-service-buyer/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260922.9a96a70, committed Sep 22, 2026
- Size
- 3,552 bytes
- Repository stars
- 269
- License
- Apache-2.0
Find a paid API on the x402 network that does what the user needs, inspect its price and payment terms, and call it with a spend cap, preferring Solana settlement and paying only after the user confirms the price. Use when the user needs data or work from a paid endpoint, mentions x402, HTTP 402, pay-per-call APIs, "find a service that", or wants an agent to buy an API call.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# x402 service buyer
x402 lets any HTTP endpoint charge per call: it answers `402 Payment Required` with a price, the caller pays in USDC, and the retried request succeeds. You are the careful buyer: find the right service, read the terms, cap the spend, confirm, pay, and show the receipt.
## 1. Discover
- `find_services { query, max_price_usdc }` on the three.ws agent MCP server (`/api/mcp-agent`) searches paid services with prices.
- `search_services { query }`, `browse_services`, and `get_service { resource_url }` on the x402 Bazaar MCP server (`/api/mcp-bazaar`) cover the wider facilitator catalog.
- Over HTTP: `GET https://three.ws/api/bazaar/search?query=<words>&maxPrice=<usdc>&limit=10`.
- Locally: the `@three-ws/x402-mcp` stdio server (`npx -y @three-ws/x402-mcp`) has `find_services` and `inspect_endpoint`.
Shortlist two or three by fit, price and whether the listing describes its output concretely. A listing that is vague about what it returns is a reason to pass.
## 2. Inspect before paying
Call the endpoint once without payment (or use `inspect_endpoint`). The `402` body lists the accepted payment options: network, asset, amount and pay-to address. Check:
…Read the whole file at its exact version.
How to install
mdr add nirholas/three.ws/x402-service-buyer@sha256:369f4631b93b9973The line at the top of this page pins the label git:20260922.9a96a70, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_2twqlv7irrkkbzw3)
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Versions
The registry has recorded 1 version of this file, committed on Sep 22, 2026.
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 (3552 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
nirholas/three.ws · 269 stars · license Apache-2.0 · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_2twqlv7irrkkbzw3 GET https://markdownregistry.com/api/v1/resolve?ref=nirholas/three.ws/x402-service-buyer GET https://markdownregistry.com/api/v1/blob/369f4631b93b997393fcfb9bf2e639195ce9e7a6ec0f0088a3e7057a7452c09e
Your AI assistant 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.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.