# License Intel

Look up, search, parse and compare open-source licenses from the SPDX list and plain-language rules.

## How to pay

Machine-payable over x402. USDC on: Base (eip155:8453), Solana (solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp), Polygon (eip155:137), Arbitrum One (eip155:42161).
No accounts. No API keys. No signup. The paying wallet is the account.

## Machine-readable

- OpenAPI: https://license-intel.x402tookit.com/openapi.json
- x402 manifest: https://license-intel.x402tookit.com/.well-known/x402
- Catalog (free): https://license-intel.x402tookit.com/catalog
- Health (free): https://license-intel.x402tookit.com/health
- Uptime (free): https://license-intel.x402tookit.com/uptime

## Endpoints (9)

### GET /deprecated-check — $0.02
Check a list of license ids against SPDX: current, deprecated or unknown, with the modern GNU -only / -or-later form.
Params: ids: string
Example: https://license-intel.x402tookit.com/deprecated-check?ids=GPL-2.0%2CGPL-2.0%2B%2CMIT%2CApache-2.0%2CFoo-1.0

### GET /license-compare — $0.02
Compare two open-source licenses side by side: what each permits, requires and disclaims, and which is stricter.
Params: a: string, b: string
Example: https://license-intel.x402tookit.com/license-compare?a=MIT&b=GPL-3.0

### GET /license-exception — $0.02
Look up an SPDX license exception id such as Classpath-exception-2.0: its name, links and deprecated status.
Params: id: string
Example: https://license-intel.x402tookit.com/license-exception?id=Classpath-exception-2.0

### GET /license-expression-check — $0.03
Validate an SPDX license expression (AND, OR, WITH, +): syntax, known ids, known exceptions and deprecated identifiers.
Params: expression: string
Example: https://license-intel.x402tookit.com/license-expression-check?expression=GPL-2.0-or-later+WITH+Classpath-exception-2.0+OR+MIT

### GET /license-family — $0.02
Classify up to 30 license ids by strength: public-domain-like, permissive, weak copyleft, strong copyleft or network copyleft.
Params: ids: string
Example: https://license-intel.x402tookit.com/license-family?ids=MIT%2CApache-2.0%2CMPL-2.0%2CGPL-3.0%2CAGPL-3.0

### GET /license-lookup — $0.02
Look up an SPDX license id: name, OSI and FSF status, deprecated flag, links, and plain-language permissions and duties.
Params: id: string
Example: https://license-intel.x402tookit.com/license-lookup?id=Apache-2.0

### GET /license-obligations — $0.02
Plain-language checklist for a license: what you may do, what you must do when you distribute, and what is disclaimed.
Params: id: string
Example: https://license-intel.x402tookit.com/license-obligations?id=Apache-2.0

### GET /license-search — $0.02
Search the SPDX license list by name or id fragment, such as gpl or creative commons, with OSI and deprecated flags.
Params: query: string, osiOnly?: string, includeDeprecated?: string, limit?: integer
Example: https://license-intel.x402tookit.com/license-search?query=gpl&osiOnly=yes&limit=10

### GET /osi-approved — $0.02
List current OSI-approved SPDX licenses, optionally only FSF-libre ones or those starting with a prefix.
Params: prefix?: string, fsfLibre?: string, limit?: integer
Example: https://license-intel.x402tookit.com/osi-approved?prefix=BSD&limit=20

## Terms

License data comes from the SPDX License List and the Choose a License project and is a summary, not legal advice. Licenses can have exceptions, dual terms and jurisdiction-specific effects; read the actual license text and ask a lawyer for anything that matters.