European Synthesizer
Market Observatory
Open, independent market data on second-hand synthesizers across Europe.
Free to access. Free to use. Free to build on.
What is this?
A public database of second-hand synthesizer prices, built from real listings.
We monitor public listings on Hispasonic, Noiz, Soundsmarket and Audiofanzine, and integrate selected listings from eBay daily, normalise every listing with a machine learning classifier, and compute percentile statistics (P25/P50/P75) from thousands of real transactions. The result is a continuously updated, open dataset on what synthesizers actually sell for in European markets.
All data is published under CC-BY-4.0 — use it, share it, build with it. No paywall, no API key required.
Latest instrument listings
Recent listings from all monitored marketplaces.
Latest accessory listings
Expansion boards, spare parts, manuals and more. Browse full catalogue →
Latest analysis
Research and findings from the Observatory's data.
First quarterly report coming soon
State of the European Used Synthesizer Market — Q2 2026 is in preparation. Subscribe to the RSS feed to receive it when published.
Explore analyses →The data belongs to the community
Every price record, every fair-price calculation, every market trend is published as an open dataset under the Creative Commons Attribution 4.0 International (CC-BY-4.0) licence. No registration. No API key. Download and use.
Build your own tools, do your own research, integrate into your shop or app. The only requirement: attribute the source.
Transparent by design
Every number on this site can be traced back to a real listing.
Ethical scraping
We crawl public marketplace listings with respectful rate limits and full robots.txt compliance. We collect only publicly visible listing data — titles, prices, dates, condition. No personal data is stored beyond what is in the public listing.
ML classification
Every listing is classified automatically — instrument vs accessory, canonical model name extraction, condition normalisation. The classifier is trained on thousands of annotated listings and continuously reviewed for accuracy.
Percentile statistics
Fair prices are computed as P25/P50/P75 percentiles across all active and recent listings per canonical model. Minimum 5 data points required for a stable estimate. Percentiles resist outliers and inflated asking prices better than averages.
Stay informed
Follow the market in real time
Subscribe to the RSS feed and get the latest listings delivered directly to your reader. No account, no spam — just new synths hitting the European second-hand market as they appear.
Prefer email? Create a free account and get notified when prices move on the specific models you follow.