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payload402 npm License Triage
x402
payload402 npm License Triage is a paid API for AI agents from payload402.edgebytenet.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Resolves the declared license for a specific npm package version, normalizes it to SPDX, and returns a permissive-default compatibility flag for coding agents.
Price / call$0.01
Success—
StatusUnknown
How this service works
npm package license triage for coding agents: call before npm install or adding a dependency mid-task. Returns declared license, SPDX normalization, and permissive-default compatible yes/no/unknown from the public npm registry. Triage only — not compliance-grade SBOM or legal advice. Workflow: call GET /license/check (or MCP check_npm_license) before npm install; if compatible=no, pick another package or escalate to human; if unknown, treat as risk. Example: left-pad@1.0.0 before install. Also: Convert amounts between ISO 4217 currencies using ECB daily reference rates (Frankfurter). Use for invoices, travel budgets, expense reports, and shopping comparisons when you need a verifiable rate instead of LLM arithmetic. Not live tradable FX — rates follow ECB business-day publication. Also: Resolve a place name or lat/lon to IANA timezone and coordinates (Open-Meteo). Use for agent scheduling, travel logistics, and local-time questions without LLM guessing. Not IP geolocation. Also: Translate short text between languages (Azure Translator). Use when an agent needs a verifiable string in another language for UI copy, messages, or research snippets — not legal, medical, or certified translation.
Output
A JSON object containing the package name, resolved version, declared license string, SPDX-normalized license identifier, a compatibility policy label (e.g. 'permissive-default'), a yes/no compatible flag, the data source ('npm-registry'), a human-readable reason, and a triage disclaimer noting this is not legal or compliance advice.
Example use cases
Pre-commit dependency license check
“I'm about to add chalk@5.3.0 to our project — can you look up its npm license and tell me if it's permissive or if there are any copyleft flags I should know about?”
Automated CI license gate
“During our build, check the license for uuid@9.0.0 on npm, normalize it to SPDX, and tell me whether it passes a permissive-default compatibility check.”
Vetting an unfamiliar library
“I found a package called node-forge at version 1.3.1 — can you resolve its declared license from the npm registry and let me know if it's safe to use in a commercial closed-source app?”
Technical details
Endpoint
POSThttps://payload402.edgebytenet.workers.dev/mcp-licenseWhen to prefer
Choose this endpoint when a coding agent needs a quick, verifiable license check on a specific npm package version before adding it as a dependency mid-task. It is ideal for automated workflows, CI pipelines, and agent-driven coding assistants that need a machine-readable SPDX identifier and compatibility flag without invoking a full SBOM or legal compliance tool. Prefer this over LLM-recalled license knowledge when accuracy and source traceability matter.
Side effects
- Package name or version not found on npm registry — returns error or empty result
- Unrecognized or non-standard license string that cannot be normalized to SPDX — may return raw license with no SPDX field
- Network or upstream npm registry unavailability causing timeout
- Malformed input schema or missing required toolName field — returns validation error
- Ambiguous or compound license expressions (e.g. (MIT OR Apache-2.0)) may require manual review
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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