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payload402 npm License Checker
x402
payload402 npm License Checker is a paid API for AI agents from payload402.edgebytenet.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Resolves the declared license for a given npm package name@version, normalizes it to SPDX format, and returns a permissive-default compatibility flag for quick triage.
Price / call$0.01
Success—
StatusUnknown
How this service works
npm package license triage for coding agents: resolve the declared license for one name@version from the public npm registry, normalize to SPDX where possible, and return a permissive-default compatibility flag. Use before adding a dependency mid-task. Triage only — not compliance-grade SBOM or legal advice.
Output
Returns the declared license for the requested npm package (and version), normalized to an SPDX identifier where possible, plus a boolean or flag indicating whether the license is considered permissive-default compatible. This is triage-level output, not a full compliance-grade SBOM or legal opinion.
Example use cases
Pre-install dependency license check
“I'm about to add axios to my project — can you look up its license from npm and tell me if it's permissive so I know it's safe to use in a commercial app?”
Triage license for specific package version
“What license does react@18.2.0 use? I need the SPDX identifier and whether it counts as permissive before I include it in this new codebase.”
Quick open source compliance scan mid-task
“I'm in the middle of building something and I just pulled in express as a dependency — can you check its npm license and flag if it's permissive or not?”
Technical details
Endpoint
GEThttps://payload402.edgebytenet.workers.dev/license/checkWhen to prefer
Use this endpoint when an AI coding agent needs a fast, lightweight license triage for a single npm package mid-task — especially before adding a new dependency to a project. Prefer it over full SBOM tools when you only need a quick permissive-vs-not signal and SPDX normalization for one package at a time, without the overhead of scanning an entire dependency tree.
Side effects
- Package name not found on npm registry — returns error or null license
- Version string does not match any published release — may fall back to latest or return error
- License field missing or non-standard in package.json — normalization may fail, returning raw string
- Ambiguous or custom license expression not mappable to SPDX — compatibility flag may be uncertain
- Rate limiting or registry outage — transient HTTP error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"spdx": "MIT",
"policy": "permissive-default",
"reason": "Permissive license matches permissive-default policy",
"source": "npm-registry",
"license": "MIT",
"package": "lodash",
"version": "4.17.21",
"compatible": "yes",
"disclaimer": "Triage indicator only, not legal or compliance advice"
}
}Tags
x402
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