Look up, search, parse and compare open-source licenses from the SPDX list and plain-language rules.
payments ON MAINNET (real money) · 9 live endpoints
| Endpoint | Price | What it answers |
|---|---|---|
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. |
GET /license-compare | $0.02 | Compare two open-source licenses side by side: what each permits, requires and disclaims, and which is stricter. |
GET /license-exception | $0.02 | Look up an SPDX license exception id such as Classpath-exception-2.0: its name, links and deprecated status. |
GET /license-expression-check | $0.03 | Validate an SPDX license expression (AND, OR, WITH, +): syntax, known ids, known exceptions and deprecated identifiers. |
GET /license-family | $0.02 | Classify up to 30 license ids by strength: public-domain-like, permissive, weak copyleft, strong copyleft or network copyleft. |
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. |
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. |
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. |
GET /osi-approved | $0.02 | List current OSI-approved SPDX licenses, optionally only FSF-libre ones or those starting with a prefix. |
GET /catalog returns this list as JSON. Activity hub · uptime.
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. Every paid response carries a disclaimer field.