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pkgproof Package Verification
x402
pkgproof Package Verification is a paid API for AI agents from x402.pkgproof.net, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-27).
Verifies the authenticity and integrity of a software package, returning a proof-of-verification result for a single package lookup.
Price / call$0.05
Success—
StatusUnknown
How this service works
Call before an agent runs npm install. Checks one npm package against the registry, OSV advisories, install scripts, typosquat and combosquat names and repository provenance, and flags hallucinated or slopsquatted names. Answers safe, caution, block or does_not_exist; every reason is sourced and labelled fact or heuristic.
Output
Returns a verification result indicating whether the specified software package is authentic and its integrity is intact, including a proof status, any detected anomalies, and metadata about the verified package version.
Example use cases
Pre-deploy dependency integrity check
“Before we ship this release, verify that the Python package requests version 2.31.0 is authentic and shows a valid pkgproof integrity result — I don't want any supply chain surprises.”
CI pipeline package gating
“In our CI pipeline we're about to install express version 4.18.2 from npm — run a pkgproof verification on it and fail the build if the package doesn't come back clean.”
Security audit of third-party library
“We're auditing our dependencies and I need you to verify that the npm package axios version 1.6.0 has a valid proof of authenticity from pkgproof before I greenlight it for the team.”
Technical details
Endpoint
POSThttps://x402.pkgproof.net/v1/verify?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a paid, authoritative single-package integrity verification with a cryptographic or provenance proof — particularly in security-sensitive workflows like CI/CD pipelines, pre-deployment audits, or supply chain risk assessments where a simple checksum comparison is not sufficient and a trusted third-party attestation is required.
Side effects
- Package not found in registry — returns not-found or unrecognized package error
- Invalid or missing package version — endpoint may return validation error
- Network or upstream registry unreachable — service may return a timeout or upstream error
- Tampered or unverified package — returns a failed verification status rather than a positive proof
- Malformed request payload — returns 400-level error for missing required fields
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| name | string | Package name. ASCII only; homoglyph and Unicode-confusable names are refused before any upstream call. |
| version | string | Optional. Omit to verify the package rather than one release. |
| ecosystem | string | The ecosystem the package belongs to: npm or pypi. |
Output
Schema · Response
{
"type": "json",
"example": {
"name": "crossenv",
"reasons": [
{
"code": "registry_security_hold",
"kind": "fact",
"detail": "Package 'crossenv' is under an npm security hold (real versions unpublished, replaced by a '-security' placeholder), quarantined by the registry. Treat with caution.",
"source": "npm_registry",
"verdict": "caution"
},
{
"code": "malicious_package",
"kind": "fact",
"detail": "crossenv is affected by a confirmed-malicious advisory (GHSA-c2m4-w5hm-vqjw): crossenv is malware",
"source": "osv.dev",
"verdict": "block"
}
],
"sources": {
"osv": "https://api.osv.dev/v1",
"npm_registry": "https://registry.npmjs.org",
"npm_downloads": "https://api.npmjs.org/downloads/point/last-week"
},
"verdict": "block",
"version": null,
"ecosystem": "npm",
"checked_at": "2026-08-14T11:02:01Z"
}
}Tags
x402
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