SteamDetective
The TL;DR
Last updated: November 9, 2026.By using the SteamDetective userscript, the SteamDetective API or this website, you agree to these terms.
- SteamDetective is free and provided as-is. It will not always be right, so check things yourself before you act on them.
- If you use the SteamDetective API for your application, only make requests the way the userscript does when you visit a profile yourself.
Provided as-is
SteamDetective is provided "as is", without any warranty. There is no guarantee that it works, that it is available, or that the information it shows is complete, current or correct.
- Most of the data comes from third-party sites. They can be down, block requests, change their format, or have wrong or outdated data, and any module can break because of it.
- You are responsible for the decisions you make with it, such as accepting or declining a trade. SteamDetective and its author are not liable for any loss or damage that comes from using it.
Using the SteamDetective API
The SteamDetective API and proxy exist so the userscript can show data without each user needing their own API keys.
Any request you send to it should be like the ones the userscript sends when you open a Steam profile yourself: one lookup per profile, at the pace of a person browsing.
Avoid sending automated or bulk requests, for example by looping through lists of Steam IDs or crawling profiles. If you need to do that, request an API key from each website directly:
- Mannco.store: https://mannco.store/seller
- Marketplace.tf (sellers only): https://marketplace.tf/apisettings
- STN.Trading: https://stntrading.eu/dev/apikey
Requests that don't follow this can be rate limited or blocked without notice, and the API can change or stop at any time.
Third-party sites
SteamDetective is not affiliated with, endorsed by, or associated with Valve Corporation, Steam, or any of the sites it gets data from. When the userscript contacts a site directly, or uses an API key you got from that site, that site's own terms apply too.
What is sent to each site is listed in the Privacy Policy.
Changes
These terms can change. The date at the top shows when they were last updated, and using SteamDetective after a change means you accept the new terms. Questions can be asked on the Discord server.