Data License

Last updated: August 12, 2026

Market price data served by MilkyWay Market's documented public API endpoints is licensed under Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0).

You can build on it. That is the point.

Scope: what this license covers

This license applies to the responses of endpoints explicitly documented as public, and to nothing else. Today that is:

  • GET https://milkyway.market/api/addon/prices/{item_hrid} — per-item daily price history (close ask/bid per day, per enhancement level)

Any endpoint we later document as public is covered from the moment it is documented. The license attaches to the served shape — the data an endpoint actually returns — not to "market data" in the abstract.

What this license does NOT cover

  • Raw market snapshots and bulk CSV/JSON exports. These are supporter features. Supporter exports are provided for the supporter's own use and analysis; they are not licensed for redistribution or republication.
  • Database contents, schemas with data, and internal materialized views. Only what the documented public endpoints serve is licensed.
  • Undocumented endpoints. Their output is not licensed and they may change or disappear without notice.

This scoping is deliberate: access to the data is tiered (anonymous, integrator key, free account, supporter — see the Terms of Service §6), and the license covers what an endpoint serves you at your tier. The license is a grant over data you have lawfully obtained; it is not a promise of unlimited access, and it does not exempt anyone from rate limits or tier boundaries.

Permitted — explicitly

  • Normal use of milkyway.market and its features
  • Viewing data through the web interface or the browser addon
  • Querying the documented public endpoints from scripts, user scripts, addons, bots, spreadsheets, or any other tool — automated queries are fine
  • Batch reads: fetching prices for many items, including on a timer, at reasonable rates within the published rate limits. This is what makes third-party integration possible, and it is welcome.
  • Republishing, remixing, and building tools, overlays, and services on the licensed data, under the CC BY-SA 4.0 terms (attribution and share-alike)

Not a licensed access pattern

  • Bulk dumps: systematically downloading, mirroring, or reconstructing the full historical dataset through the public endpoints. Bulk export exists as a supporter feature; hammering the API to rebuild it is not a licensed use of the endpoints.
  • Circumventing rate limits, access tiers, or authentication
  • Redistributing or republishing supporter-only data (raw snapshots, bulk exports)

Attribution — requested, not required

CC BY-SA 4.0 makes attribution a condition of the license. In practice, we ask for it and we do not police it. If you use the data, please include this string, linked:

Data from milkyway.market

That is the whole ask. A visible credit in your tool, README, or about page keeps the data flowing for everyone and is genuinely appreciated. If you cannot fit it, we would rather you build the thing than not.

Share-alike

CC BY-SA 4.0 means derivative datasets you distribute must be shared under the same license. Your own code, tool, or service is yours — share-alike applies to the data, not to software that merely consumes it.

Sample & Mock Data

Any sample data, fixtures, or mock data included in this repository for development and testing purposes is synthetic and not representative of the real dataset. Such data is not subject to this license.

Third-Party Content

docs/game-knowledge/ mirrors articles from the community-run Milky Way Idle Wiki, which are licensed CC BY-SA 4.0 by their authors — not by us, and not under the terms above. Each file records the article URL and the wiki revision it was taken from. Reuse of that directory is governed by CC BY-SA 4.0.

Not Affiliated

MilkyWay Market is a fan project. We are not affiliated with, endorsed by, or connected to Milky Way Idle or its developers. All game-related content belongs to its respective owners.

Questions

Building something and unsure whether it fits? Reach out — open an issue on GitHub or email mathewcst@c3d.gg. The answer is probably yes.