Metered MCP tools: free discovery over MCP; per-call execution settled in USDC via x402 v2.
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io.github.dev55acc-ai/paid-mcp-metering is an MCP server that metered MCP tools: free discovery over MCP; per-call execution settled in USDC via x402 v2. Its tool list has not been published yet over http, requires no API key, and scores 92/100 on MCPpedia's security, maintenance and efficiency rubric.
Config is the same across clients — only the file and path differ.
{
"mcpServers": {
"io-github-dev55acc-ai-paid-mcp-metering": {
"args": [
"-y",
"npm"
],
"command": "npx"
}
}
}Are you the author?
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Discovery is free: POST /mcp speaks JSON-RPC 2.0 per the Model Context Protocol (initialize, tools/list, ping). Execution is metered: POST /v1/t/{tool} sits behind an x402 v2 paywall. An unpaid request gets HTTP 402 with payment requirements; a paid request carries a PAYMENT-SIGNATURE header and settles USDC through the facilitator before the tool runs.
Run this in your terminal to verify the server starts. Then let us know if it worked — your result helps other developers.
npx -y 'npm' 2>&1 | head -1 && echo "✓ Server started successfully"
After testing, let us know if it worked:
Five weighted categories — click any category to see the underlying evidence.
Packing does not respect root-level ignore files in workspaces
### Impact `npm pack` ignores root-level `.gitignore` & `.npmignore` file exclusion directives when run in a workspace or with a workspace flag (ie. `--workspaces`, `--workspace=<name>`). Anyone who has run `npm pack` or `npm publish` with workspaces, as of [v7.9.0](https://github.com/npm/cli/releases/tag/v7.9.0) & [v7.13.0](https://github.com/npm/cli/releases/tag/v7.13.0) respectively, may be affected and have published files into the npm registry they did not intend to include. ### Patch - Up
Incorrect Permission Assignment for Critical Resource in NPM
An issue was discovered in an npm 5.7.0 2018-02-21 pre-release (marked as "next: 5.7.0" and therefore automatically installed by an "npm upgrade -g npm" command, and also announced in the vendor's blog without mention of pre-release status). It might allow local users to bypass intended filesystem access restrictions because ownerships of /etc and /usr directories are being changed unexpectedly, related to a "correctMkdir" issue.
Local Privilege Escalation in npm
Affected versions of `npm` use predictable temporary file names during archive unpacking. If an attacker can create a symbolic link at the location of one of these temporary file names, the attacker can arbitrarily write to any file that the user which owns the `npm` process has permission to write to, potentially resulting in local privilege escalation. ## Recommendation Update to version 1.3.3 or later.
npm CLI exposing sensitive information through logs
Versions of the npm CLI prior to 6.14.6 are vulnerable to an information exposure vulnerability through log files. The CLI supports URLs like `<protocol>://[<user>[:<password>]@]<hostname>[:<port>][:][/]<path>`. The password value is not redacted and is printed to stdout and also to any generated log files.
npm Vulnerable to Global node_modules Binary Overwrite
Versions of the npm CLI prior to 6.13.4 are vulnerable to a Global node_modules Binary Overwrite. It fails to prevent existing globally-installed binaries to be overwritten by other package installations. For example, if a package was installed globally and created a `serve` binary, any subsequent installs of packages that also create a `serve` binary would overwrite the first binary. This will not overwrite system binaries but only binaries put into the global node_modules directory. This b
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Metered MCP tools, priced per call.
Discovery is free: POST /mcp speaks JSON-RPC 2.0 per the Model Context Protocol (initialize, tools/list, ping). Execution is metered: POST /v1/t/{tool} sits behind an x402 v2 paywall. An unpaid request gets HTTP 402 with payment requirements; a paid request carries a PAYMENT-SIGNATURE header and settles USDC through the facilitator before the tool runs.
Base URL: https://paid-mcp-metering.vercel.app
GET /health — free, publicPOST /mcp — free discoveryPOST /v1/t/{tool} — metered; currently answers 503 settlement_not_configured because X402_PAY_TO is unset on the deployment (settlementConfigured:false in /health is the honest switch). No payment can be accepted until a receiving address is configured.server.json declares this URL as the registry remote.
| Tool | Price | What it returns |
|---|---|---|
web_search | $0.001/call | Ranked live web results with source URLs |
deep_research | $0.01/call | Multi-source research pass with a synthesized answer plus cited sources |
Upstreams are Exa (primary) and Tavily (fallback). Every handler returns live upstream output or throws — there is no canned response.
x402 v2, USDC, EIP-155 network selected by X402_NETWORK (default Base Sepolia testnet, CAIP-2 eip155:84532). Facilitator defaults to https://x402.org/facilitator.
| Env var | Purpose |
|---|---|
X402_PAY_TO | Receiving address. Required for settlement; unset serves 402 requirements only |
X402_NETWORK | CAIP-2 network id (default eip155:84532) |
X402_FACILITATOR_URL | x402 facilitator endpoint |
EXA_API_KEY / TAVILY_API_KEY | Search upstream credentials |
npm install
npm run build
npm start # node dist/x402-server.js
npm test # build + node --test dist/test-x402.js
Free discovery:
curl -s localhost:4021/mcp -H 'Content-Type: application/json' \
-d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'
Paid execution:
curl -s localhost:4021/v1/t/web_search -H 'Content-Type: application/json' \
-d '{"query":"x402 protocol","max_results":3}'
# -> 402 with payment requirements; pay via an x402 client and retry with PAYMENT-SIGNATURE
server.json targets the official MCP Registry as io.github.dev55acc-ai/paid-mcp-metering. Tagging v* runs .github/workflows/publish-mcp.yml: tests, build, npm publish (when NPM_TOKEN is set), then registry publish authenticated by GitHub OIDC — no stored registry credential.
MIT