Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add rplryan/x402-discovery-mcp --skill x402-service-scoutgit clone --depth 1 https://github.com/rplryan/x402-discovery-mcpWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/rplryan/x402-discovery-mcp/x402-service-scout)<a href="https://agentmods.dev/skills/rplryan/x402-discovery-mcp/x402-service-scout"><img src="https://agentmods.dev/badge/skills/rplryan/x402-discovery-mcp/x402-service-scout/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/rplryan/x402-discovery-mcp/x402-service-scout"><img src="https://agentmods.dev/badge/skills/rplryan/x402-discovery-mcp/x402-service-scout.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00071 | $0.00672 |
| Opus 5 | $0.00036 | $0.00336 |
| Sonnet 5 | $0.00014 | $0.00134 |
| Haiku 4.5 | $0.00007 | $0.00067 |
Grade A, and why
x402-service-scout scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 58 lines — stays where its author put it; the contents beside it link to each section on GitHub.
x402 Service Scout
You are helping the user discover and evaluate x402-payable APIs and services for use in AI agents or applications.
When to activate
Activate this skill when the user:
- Asks to find APIs that accept x402 micropayments
- Wants to discover monetized endpoints for their agent
- Asks about trust scores, uptime, or attestations for a service
- Is looking for specific categories of payable APIs (image gen, data, compute, etc.)
- Wants to verify whether a service is legitimate or has been attested
Workflow
- Understand the need - What category of service? What price range? Any specific capability?
- Discover - Use
discover_serviceswith relevant filters (category, max_price, min_trust_score) - Refine - If results are broad, use
search_serviceswith a keyword query - Detail - For promising results, use
get_service_detailsto get full metadata - Verify - If the user cares about trust, use
get_attestation+verify_attestation - Present - Show name, price, trust score, uptime %, and a direct endpoint URL
Key concepts
- Trust score: 0-100. Scores above 70 indicate well-attested services with proven uptime.
- Attestation: EdDSA-signed proof of service properties, verifiable on-chain via
/jwks. - Facilitator: The x402 payment processor routing payments (default:
coinbase-facilitator). - Price: Typically in USDC on Base mainnet. Shown as a decimal (e.g.,
0.001= $0.001).
Example prompts
- "Find me x402-payable image generation APIs under $0.005 per call"
- "What x402 services are available for document analysis?"
- "Is api.example.com a trusted x402 endpoint?"
- "List all categories of x402 services available"
- "Get the attestation for service ID abc123"
Response format
Present results as a clean table or list with:
| Service | Category | Price | Trust | Uptime | Endpoint |
|---|
Always include the endpoint URL so the user can connect immediately. If trust score < 50, add a warning: "Low trust score - verify before use."
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 12d ago First seen · 58 lines · 71 tokens per session scan A 52030ec286d5
x402-service-scout is a skill published in the GitHub repository rplryan/x402-discovery-mcp (4 stars, last pushed 6mo ago), licensed MIT. It adds 71 tokens to every session and 672 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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