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packages.melchiorlabs.com NPM Package Evidence
x402
packages.melchiorlabs.com NPM Package Evidence is a paid API for AI agents from packages.melchiorlabs.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).
Returns a citation-ready evidence record for an npm package, including registry facts, integrity digests, license, repository URL, resolved version, and provenance attestation status.
Price / call$0.003
Success—
StatusUnknown
How this service works
Pay per request for a stable, citation-ready npm package evidence record: registry facts, integrity, and provenance over x402.
Output
A JSON object containing the resolved version, license, repository URL, sha512 integrity digest of the package, attestation URL (if available), signature count, provenance flags (e.g. provenance_attestation_missing), a unique request ID, and a disclaimer about the scope of the report.
Example use cases
Audit trail for dependency review
“I need a stable, citable evidence record for the npm package 'express' version 4.18.2 — grab the integrity hash, license, resolved version, and provenance status so I can attach it to our dependency audit report.”
Verify open-source package before shipping
“Before we ship, can you check the npm package 'axios' at version 1.6.0 and tell me whether it has a provenance attestation, what its integrity digest is, and what license it's under?”
Citation for security compliance documentation
“I need a citation-ready evidence record for 'chalk' version 5.3.0 from the npm registry — give me the repository URL, signature count, integrity hash, and any provenance flags so I can include it in our compliance docs.”
Technical details
Endpoint
POSThttps://packages.melchiorlabs.com/v1/npm/evidenceWhen to prefer
Choose this endpoint when you need a stable, pay-per-request, citation-ready evidence record for an npm package — particularly for audit trails, compliance documentation, or software supply chain verification where a single authoritative snapshot of registry facts, integrity, and provenance status is required. Prefer this over scraping the npm registry directly when you need a structured, request-ID-backed artifact suitable for citation.
Side effects
- Package or version not found in the npm registry — returns an error indicating unresolvable package
- Network or registry availability issues causing lookup failure
- Invalid package name format causing a validation error
- Provenance/attestation data unavailable, surfaced as a flag rather than a hard failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| package | string | Public npm package name, scoped or unscoped, lowercase. |
| version | string | Exact semver or dist-tag. |
| nodeVersion | string | Exact stable semver; enables the node_engine_mismatch flag. |
Output
Schema · Response
{
"type": "json",
"example": {
"flags": [
"provenance_attestation_missing"
],
"digests": {
"input": "…",
"result": "…"
},
"license": "MIT",
"requestId": "89416332-bc4e-43da-b0e2-32af08677d9e",
"limitations": [
"This report states public npm registry facts only; it does not certify that the package is safe, trustworthy, maintained, or free of vulnerabilities."
],
"distribution": {
"integrity": "sha512-…",
"attestationUrl": null,
"signatureCount": 1
},
"repositoryUrl": "git+https://github.com/example/example.git",
"resolvedVersion": "2.19.0"
}
}Tags
x402
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