SoldStack is an API that returns cleaned sold-price comps for secondhand clothes, shoes and bags in a single call. It fetches live Poshmark sold listings (cached for six hours), filters out mismatches - off-topic titles, bundles, kids’ sizes, other item types, duplicates and price outliers - and returns ready-to-use metrics: median, p10/p90, median_days_to_sell, median_net_payout, suggested_max_buy (one-third of net payout) and a plain‑English cleaning.confidence. Endpoints include /v1/sold for the full stats and /v1/verdict for buy/pass guidance; responses include stats and cleaning objects and are demonstrated with cURL, JavaScript and Python examples.
Designed to run behind an app, SoldStack powers workflows like thrift-scanner buy/pass decisions, auto-filling listing prices, browser extensions that show sold comps, and a Google Sheets formula for no-code use. Pricing is per lookup with 100 free monthly lookups and free repeats within the 6-hour cache window; launch discounts are available. eBay isn’t included because its sold data requires sign-in/CAPTCHA and closed APIs; additional marketplaces will be added based on developer demand. Data collection is rate-limited and polite, API keys are issued on signup, and developer support is available by email.
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