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Dependency Truth – npm/PyPI Version Verifier
x402
Dependency Truth – npm/PyPI Version Verifier is a paid API for AI agents from dependency-truth.inboxtzdjqv.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02).
Fetches the current stable release of an npm or PyPI package and validates a claimed version or publication date against live registry metadata.
Price / call$0.005
Success—
StatusUnknown
How this service works
Deterministic package, repository, security, and citation evidence APIs payable per call with x402.
Output
Returns a JSON object with the current stable version, its publication timestamp, whether the package is deprecated or yanked, a claim object indicating whether the supplied version and/or date match registry truth, any warning flags, and direct provenance URLs to the npm or PyPI registry pages for audit.
Example use cases
Validate AI-generated dependency suggestions
“My AI coding assistant told me to use requests 2.31.0 for Python — can you check if that's actually the current stable PyPI version or if something newer is out?”
Audit requirements file before deployment
“We're about to deploy and I want to confirm that fastapi is still at version 0.111.0 on PyPI and hasn't been yanked or deprecated — can you check?”
Fact-check a blog post package claim
“I read a tutorial that says lodash 4.17.21 is the latest npm release — can you verify that's still the current stable version and confirm when it was published?”
Technical details
Endpoint
POSThttps://dependency-truth.inboxtzdjqv.workers.dev/v1/dependency-truth?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to programmatically verify whether a specific npm or PyPI package version claim is accurate against live registry data — especially in CI pipelines, AI agent tool-use, documentation audits, or supply-chain checks. Prefer it over manual registry lookups when you also need a structured claim-validation result (versionCurrent, publishedDate match) rather than just browsing the registry. It is ideal when the agent must confirm facts about a dependency without relying on potentially stale training data.
Side effects
- Package not found in the specified ecosystem returns an error or null stable version
- Misspelled package name yields no match
- Unsupported ecosystem value (anything other than 'npm' or 'pypi') fails schema validation
- Registry is temporarily unavailable causing a fetch timeout
- Scoped npm package names (e.g. @scope/pkg) may require exact formatting
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| package | string | Exact package name |
| ecosystem | string | Package registry |
| claimedDate | string | Optional YYYY-MM-DD publication claim to check |
| claimedVersion | string | Optional version claim to check |
Output
Schema · Response
{
"type": "json",
"example": {
"claim": {
"version": "5.1.0",
"dateCurrent": null,
"publishedDate": null,
"versionCurrent": true
},
"flags": [],
"yanked": false,
"package": "express",
"ecosystem": "npm",
"fetchedAt": "2026-09-20T12:00:00.000Z",
"deprecated": null,
"publishedAt": "2025-03-31T14:24:25.696Z",
"stableVersion": "5.1.0",
"provenanceUrls": [
"https://www.npmjs.com/package/express",
"https://registry.npmjs.org/express"
]
}
}Tags
x402
Reviews
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