Pulsefeed X402 MCP Server

PulseFeed

Verify before you pay or install.

Two questions an agent has to answer before it acts, and neither is answered by a scanner that only looks at the present:

• Is this x402 endpoint safe to pay? — liveness, a 0–100 trust score, scam flags (receiver swapped, catalog price ≠ challenge price, honeypot receiver, testnet listed as production), with a pay/avoid verdict and on-chain proof links on Base.
• Did this MCP server or npm package change after people adopted it? — an install script added in a later version, ownership swapped, repository removed, package unpublished, build provenance lost.

The second question is the one static scanners cannot answer. A rug pull is clean at review time by construction: the package collects installs for weeks, and only then ships the patch that runs code on npm i. Answering it requires yesterday's snapshot to exist, which is why the series here starts on 2026-07-30 and cannot be reconstructed after the fact.

PulseFeed re-audits the whole MCP registry every night and diffs it against the previous day's snapshot, and re-probes the x402 endpoint population daily. Everything below is free, needs no key, and no account.

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MCP server

Hosted, no install:

https://pulsefeed.dev/mcp-server

Streamable HTTP. Also on the official MCP registry, Smithery and Glama.

Or run it locally — see mcp/:

npx pulsefeed-x402-mcp

Tools include check_x402_endpoint (is this endpoint safe to pay), mcp_check_server (audit before installing), mcp_drift_check (the rug-pull check — pass your own dependency list), mcp_security_report, x402_incidents and x402_changes.

Drift badge

Put it in your README. It states what changed in your package after people adopted it:

[![MCP drift](https://pulsefeed.dev/badge/mcp.svg?package=YOUR-PACKAGE)](https://pulsefeed.dev/mcp/drift)

Use your registry name (io.github.you/your-server) or your npm package name.

A green badge is a public claim about your package, so it is only issued when the package is actually in our snapshot. When it is not, the badge reads unwatched in grey — never green. Reporting absence of measurement as evidence of cleanliness is a mistake we made once publicly and will not repeat; see the correction.

CI check

Fails the build when something you already depend on changes dangerously:

- uses: Nikolife2016/mcp-drift-action@v1

Marketplace · source. Run it on a schedule, not only on pull requests — drift happens between your commits.

Free API

No key, CORS enabled, safe to call from a browser or a catalog page:

# what changed, whole registry
curl -s "https://pulsefeed.dev/mcp/drift.json?days=7"

# only your dependencies
curl -s "https://pulsefeed.dev/mcp/drift.json?packages=pkg-a,pkg-b&days=7"

# is this x402 endpoint payable
curl -s "https://pulsefeed.dev/verify?endpoint=<url>"

Subscribe without signing up — the filter lives in the URL, so there is no subscriber database and nothing to leak:

https://pulsefeed.dev/mcp/drift.rss?packages=pkg-a,pkg-b

Full spec: /openapi.json.

Open data

• Live feed: pulsefeed.dev/mcp/drift
• Ecosystem state: pulsefeed.dev/status.json
• Dataset: Nikolife/pulsefeed-x402-security

On being wrong in public

We once published that 76% of x402 endpoints were dead. That measured our own parser, not the market, and the figure was corrected twice more after that — each time downward, each time for the same class of reason: our own behaviour recorded as somebody else's track record. The whole mechanism, every correction and the checklist that came out of it are kept at pulsefeed.dev/correction rather than quietly deleted.

If you find a number here that does not hold, open an issue — that page is where it will end up.

What's in this repository

License

MIT