Borrowing it
Nothing to install: this file belongs to nirholas/x402-payments-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/nirholas/x402-payments-mcp/main/AGENTS.mdgit clone --depth 1 https://github.com/nirholas/x402-payments-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/instructions/nirholas/x402-payments-mcp/agents-md)<a href="https://agentmods.dev/instructions/nirholas/x402-payments-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/nirholas/x402-payments-mcp/agents-md/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/instructions/nirholas/x402-payments-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/nirholas/x402-payments-mcp/agents-md.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 | $0.00382 | $0.00382 |
| Opus 5.5 | $0.00153 | $0.00153 |
| Sonnet 5.5 | $0.00076 | $0.00076 |
| Haiku 4.5 | $0.00038 | $0.00038 |
Grade A, and why
x402-payments-mcp AGENTS.md 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 29d 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.
What it actually says
AGENTS.md
Guidance for AI coding agents working in this repository.
What this is
@three-ws/x402-mcp v0.2.3. Give any AI agent a self-custodial x402 wallet. Search the live bazaar, inspect an endpoint's price without paying, and pay_and_call any x402 service in USDC or $THREE from your own Solana key — real @x402 settlement, bounded by spend caps. No custodial wallet, no account.
A Model Context Protocol server. Run it over stdio from any MCP client.
Use it
npx -y @three-ws/x402-mcp
Full usage, tool list and configuration are in README.md. Machine-readable summaries: llms.txt and llms-full.txt.
Develop
npm install
npm test
Scripts:
npm run start:node src/index.jsnpm run test:node --test "test/**/*.test.mjs"npm run inspect:npx -y @modelcontextprotocol/inspector node src/index.js
Conventions
- ES modules, Node >=20.
- Read-only by default. Anything that signs, spends or sends must be an explicit, separately named tool or option, and must never be inferred from untrusted text (token names, memos, listings).
- Never commit credentials. Configuration comes from environment variables documented in the README.
- Keep changes small and covered by a test next to the code they change.
Source of truth
This repository is a generated mirror of packages in https://github.com/nirholas/three.ws. Open issues here; send substantial changes as a pull request here or upstream.
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.
- 29d ago Changed · -11 lines · -75 tokens per session b76ae551e590
- 1mo ago First seen · 52 lines · 457 tokens per session scan A 08b4892c6f37
x402-payments-mcp AGENTS.md is an instructions file published in the GitHub repository nirholas/x402-payments-mcp (9 stars, last pushed 29d ago), licensed Apache-2.0. It adds 382 tokens to every session, about $0.0015 per session on Opus 5.5. 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 2026-10-10.
x402-payments-mcp AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| x402-payments-mcp AGENTS.mdnirholas/x402-payments-mcp | Instructions file | 9 | 29d ago | Apache-2.0 | A | 382 | Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | yesterday | MIT | A | 7,461 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 5,516 | GitHub Copilot |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | yesterday | MIT | A | 4,680 | Codex, OpenCode |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |
| vscode ai-customization.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 1,907 | GitHub Copilot |