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License Intel – SPDX License Expression Validator
x402
License Intel – SPDX License Expression Validator is a paid API for AI agents from license-intel.x402tookit.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-30).
Validates an SPDX license expression (with AND, OR, WITH, + operators) for syntax correctness, known license IDs, known exceptions, and deprecated identifiers.
Price / call$0.03
Success—
StatusUnknown
How this service works
Validate an SPDX license expression (AND, OR, WITH, +): syntax, known ids, known exceptions and deprecated identifiers.
Output
Returns a structured JSON object containing: a verdict (valid/invalid), a human-readable summary, an array of reasons explaining any issues, a list of parsed license objects (each with id, name, status, canonicalId, OSI-approved flag, and whether + was used on a deprecated ID), a list of exception objects, the list of operators found, any warnings, the SPDX list version used, data freshness timestamp, and source attribution.
Example use cases
Pre-publish license expression check
“Before I publish my npm package, can you validate that 'MIT OR Apache-2.0' is a properly formed SPDX expression with no deprecated identifiers?”
Validate complex copyleft expression
“Check if 'GPL-2.0-only WITH Classpath-exception-2.0 OR LGPL-2.1-or-later' is a valid SPDX expression — I need to know if the syntax is right and whether all the IDs and exceptions are recognized.”
CI pipeline license gate
“We're gating our CI build on license compliance — can you validate the SPDX expression 'Apache-2.0 AND (MIT OR BSD-2-Clause)' and flag any unknown or deprecated license IDs so we can block bad merges?”
Technical details
Endpoint
GEThttps://license-intel.x402tookit.com/license-expression-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to validate a full SPDX compound expression (using AND, OR, WITH, or + operators) rather than checking a single license ID in isolation. It is the right choice for CI/CD pipelines, package publishing workflows, or legal compliance checks where the expression structure and operator semantics matter, not just whether individual IDs exist. Use the sibling lookup endpoints for single-ID metadata or plain-language explanations.
Side effects
- Missing 'expression' query parameter returns an error
- Malformed SPDX syntax returns a verdict of invalid with reasons explaining the parse failure
- Unknown license IDs are flagged in the license list with status 'unknown' rather than causing a hard error
- Deprecated license IDs are flagged but may still return a valid parse if syntax is correct
- Network or upstream SPDX data unavailability may return a degraded flag with partial results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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