PulseFeed
[Wellknown] [npm]
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unpublished, build provenance lost.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.
MCP server
Hosted, no install:
Streamable HTTP. Also on the official MCP registry,
Smithery and
Glama.
Or run it locally — see 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:
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:
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:
Subscribe without signing up — the filter lives in the URL, so there is no subscriber
database and nothing to leak:
Full spec: /openapi.json.
Open data
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
