proofcheck@0.1.4
VERIFIED· install onlyPublisher claims: "Enables verification of x402 signed offers and receipts, plus signer-authorization evidence via did:web, DNS, and ERC-8004 lookups. Also provides unpaid preflight checks for x402 endpoints and ERC-8004 agent lookups." Observed in sandbox: no network, touches nothing outside the project, writes no memory.
Coverage
Nothing executable in the bundle ran; the trace covers the install step only.- Tested
- every file read, file written and host contacted by what ran
- Not tested
- use of the skill by an agent
What this means for the label: Verified here covers what ran. The server's tools were not exercised with a real credential, so nothing about their behavior is asserted; the credential summary below says what to do with that.
Before you give it your token
- It will ask for
- no credential variables read in the code
- Where it talks to
- no vendor host named in the codeAlso publicnode.com, drpc.org, base.org, optimism.io, arbitrum.io, avax.network, gnosischain.com, celo.org, linea.build, scroll.io, ipfs.io, cloudflare-dns.com, workers.dev, mart402.com — not the publisher's domain; check what for before connecting.
- What the honeypot saw
- no credential files read · no network
- What we could not test
- use of the skill by an agent
Connect it under the guard. Nothing executable in the bundle ran; the trace covers the install step only. The code names no credential variable; the guard pins the network to what the honeypot saw and logs every call.
Never paste a credential into a chat, a ticket or a report, including ours. How the guard holds it.
Is [email protected] safe to install?
KillerSkills ran it in the KillerSkills honeypot sandbox (1 scenario; nothing executable in the bundle ran; the trace covers the install step only) on 2026-11-13 and scored it 85/100 (Verified). In what ran, nothing we could detect went wrong: no undeclared network egress, no credential reads, no persistent instruction writes. What it does with a real credential was not observed; the static findings and the publisher carry the rest of the score. Summary: no network, touches nothing outside the project, writes no memory.
Behavior trace
Honeypot run · 0 s · 1 scenarios · 0 deviationsStatic findings
…onst bad = ["http://example.com", "https://localhost/x", "https://127.0.0.1/", "https://10.0.0.1/", "https://169.254.169.254/latest", "https://[::1]/", "https://example.com:844…Fix: Replace encoded or assembled strings with plain literals and remove undeclared network calls.…433/", "https://intranet/", "https://foo.internal/", "https://0x7f.1/", "file:///etc/passwd", "ftp://example.com", "not a url", "https://192.168.1.1/", "https://example.co…Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.for (const u of ["https://127.0.0.1/", "http://169.254.169.254/latest/meta-data", "https://localhost/x", "file:///etc/passwd"]) {Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.for (const u of ["https://127.0.0.1/", "http://169.254.169.254/latest/meta-data", "https://localhost/x", "file:///etc/passwd"]) {Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.…le.com/", "https://2130706433/", "https://intranet/", "https://foo.internal/", "https://0x7f.1/", "file:///etc/passwd", "ftp://example.com", "not a url", "https://192.168.1…Fix: Put hosts, commands and strings in plain source. Decoding at runtime looks identical to malware and costs points on its own.app.get("/mcp", (c) => c.json({ error: "method_not_allowed", detail: "POST JSON-RPC to /mcp (stateless Streamable HTTP; no SSE stream offered)" }, 405));Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.…ttps://169.254.169.254/latest", "https://[::1]/", "https://example.com:8443/", "https://user:[email protected]/", "https://2130706433/", "https://intranet/", "https://foo.internal…Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.const { f } = stubFetch([(u) => (u === "https://a.example.com/" ? new Response(null, { status: 302, headers: { location: "https://169.254.169.254/" } }) : undefined)]);Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.…xample.com", "https://localhost/x", "https://127.0.0.1/", "https://10.0.0.1/", "https://169.254.169.254/latest", "https://[::1]/", "https://example.com:8443/", "https://user:pw@exampl…Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.Cost to the agent
Tokens estimated at four characters each. Skills load their instruction text when triggered; the figure is what that costs.
Known vulnerabilities
Vulnerability advisories (OSV) cover npm and PyPI packages; this registry has no advisory database.