SoldSignal - Free resale prices with sample sizes and fees, no API key
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Resale price sites give you one number with no date, source or sample size. SoldSignal is a free weekly index for 30 sneakers, consoles, collectibles and watches from GOAT, StockX, Mercari and Chrono24. Every price shows SOLD vs ASK, how many data points it comes from, and what a seller keeps after each platform's fees. Free JSON/CSV API with no key, a fee calculator, and weekly archives.
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Hi Product Hunt! I built SoldSignal because resale price sites usually give you one number with no date, no source and no idea how many sales sit behind it.
Every price on SoldSignal says whether it is SOLD (finished sales) or ASK (current listings), how many data points it comes from, and what a seller actually keeps after GOAT, StockX, eBay or Mercari fees. It covers 30 sneakers, consoles, collectibles and watches, refreshed every Monday, and every week is archived so price history builds up.
For developers it is a free JSON/CSV API with no key or signup, an OpenAPI spec, and one Google Sheets formula if you don't code.
One lesson from building it: StockX shows prices in the visitor's local currency, and one run quietly mixed euros into USD. Now every row carries its currency and StockX alone can never publish a price.
What item should I track next?