SoldStack – sold prices API for secondhand clothes
API that returns real sold prices for secondhand clothes, shoes and bags — not asking prices.
SoldStack is an API that answers one question — what did this item actually sell for — for secondhand clothes, shoes and bags. It searches Poshmark listings (refreshed every 6 hours), strips out bundles, wrong sizes, duplicates and outliers, then returns the median price, price range, days to sell, what the seller kept after fees, and a suggested max buy (a third of net payout). The free tier gives 100 lookups a month with no card required; it plugs into REST, Google Sheets formulas, or AI agents. Poshmark is the only marketplace covered today — eBay killed its public sold-items API in February 2025 and now gates search behind a CAPTCHA, so SoldStack is building a compliant alternative rather than scraping around it.
What holds up
- +Free tier gives 100 lookups a month, no card needed to try it.
- +Strips bundles, wrong sizes, duplicates and outliers before computing the price — not raw search noise.
- +Works as a REST API, a Google Sheets formula, or inside AI agents — one key, three surfaces.
- +Returns a suggested max buy price (a third of net payout), useful straight at the register.
Mind the limits
- −Only Poshmark is covered today — no eBay, Depop or Vinted sold prices yet.
- −Data refreshes every 6 hours, so the very latest sales may not show up immediately.
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