Data Sources

Where the Observatory's data comes from, how each source is treated, and what we deliberately exclude.

Active sources

Platform	Country	Category	Integration	Notes
Hispasonic	Spain	Instruments & accessories	Daily crawler	Spain's largest musician community marketplace. Full listing detail collected.
Noiz.gr	Greece	Instruments & accessories	Daily crawler	Leading Greek music gear marketplace.
Soundsmarket	Spain / EU	Instruments	Daily crawler	Aggregator with pan-European coverage.
Audiofanzine	France / EU	Instruments & accessories	Daily crawler	French music community with active classifieds section.
eBay	EU (multi)	Instruments	Selected via API	Only completed/sold listings used for pricing signals. Images are not displayed (eBay ToS); listing URLs link out to eBay directly.

Platform	Reason for exclusion
Wallapop	Terms of service prohibit automated data collection. No public API available.
Facebook Marketplace	Requires authentication to browse; scraping violates Meta ToS.
Reverb	US-centric pricing; ToS restricts bulk data extraction. May be added via official API in a future version.

We only collect data from sources that allow crawling in their robots.txt or do not prohibit it in their ToS.
Crawls are rate-limited and run once per day to minimise load on source servers.
We store structured price signals (price, currency, condition, date) — not full listing text, personal seller data, or private contact details.
Images from platforms that block hotlinking are either served via server-side proxy or not displayed.
Any platform operator can request removal of their data via the Takedown page.
All published data is released under CC BY 4.0.