Free
Trying it out
$0forever
- Lookups / month
- 100
- Per 1,000 lookups
- $0
- Repeat searches
- Free for 6 hours
- Sources
- Poshmark US and Canada
- Valuation history
- Last 90 days
- Paste-a-listing reads
- 20 / day
Pricing
Pay for lookups, not seats. A lookup is a search you make for the first time: repeating it within 6 hours is free, and so is changing its filters.
Starter
Side projects and small tools
$9/ month
- Lookups / month
- 2,500
- Per 1,000 lookups
- $3.60
- Repeat searches
- Free for 6 hours
- Sources
- Poshmark US and Canada
- Valuation history
- Last 90 days
- Paste-a-listing reads
- 20 / day
Growth
Recommended
Apps with real users
$29/ month
- Lookups / month
- 15,000
- Per 1,000 lookups
- $1.93
- Repeat searches
- Free for 6 hours
- Sources
- Poshmark US and Canada
- Valuation history
- Full archive
- Paste-a-listing reads
- 200 / day
Plus:
- Email reply within 1 business day
- Reserved spots in line when busy
- 300 deep lookups per 10 min
- 10% over your limit before any cutoff
Scale
Pricing engines and analytics
$79/ month
- Lookups / month
- 60,000
- Per 1,000 lookups
- $1.32
- Repeat searches
- Free for 6 hours
- Sources
- Poshmark US and Canada
- Valuation history
- Full archive
- Paste-a-listing reads
- 1,000 / day
Plus:
- First in line for support
- Reserved spots in line when busy
- 600 deep lookups per 10 min
- 20% over your limit before any cutoff
Just need it for a month?
$5 one-month pass. 1,000 lookups for 30 days in Google Sheets, the API or AI agents ($5.00 per 1,000 if you use them all). One payment, no subscription, nothing to cancel; after 30 days your key goes back to Free.
Free needs no card. Paid plans are billed monthly through Stripe and you can cancel any time on your account page. The pass is one payment with nothing to cancel. Terms
Valuing lists in bulk for a business, or need a custom plan? Email aaron@soldstack.dev.
What will I pay?
Count each item or search you look up for the first time in a month. The same search again within 6 hours is free, and so is changing its filters, so your count can be lower than the number of searches you run. A POST /v1/value list counts every item, every time.
Questions
What counts as a lookup?
A search you make for the first time. Ask the same /v1/sold or /v1/verdict search again within 6 hours and the cached result comes back free, and so does changing its filters (size, condition, days, price range). Each item in a POST /v1/value list is one lookup, cached or not: a 40-item list is 40 lookups. Failed lookups (errors from the marketplace) don't count.
What happens when I reach my limit?
Requests stop with a 429 and the date your lookups come back. Nothing is billed extra.
- Free: stops at 100; comes back on the 1st of the next month (UTC).
- Starter: stops at 2,500; comes back on your next billing date.
- Growth: may go 10% over before it stops, up to 16,500 (15,000 plus 1,500).
- Scale: may go 20% over, up to 72,000 (60,000 plus 12,000).
- One-month pass: 1,000 lookups for 30 days, then your key goes back to Free.
A /v1/value list longer than the lookups you have left is refused whole and nothing is counted. To get more, upgrade your plan; a Free key can also buy the pass.
How far back does the history go?
This is how far back /v1/value lists, pasted listings and the AI-agent value tool look. Free, Starter and the pass use sales from the last 90 days (keys issued before Oct 25, 2026 keep the full archive). Growth and Scale use the full archive.
Can I show the values to my own customers?
Yes, on every plan. The terms let you use results inside your own products, for example to show prices, suggest prices or analyse the market for your users. You can't resell or redistribute the raw API output as a data feed or a competing API, and you're responsible for following the marketplaces' own terms in how you use the data.
Can I cancel? Do you give refunds?
Cancel any time on your account page. You keep your plan until the end of the period you paid for, then your key goes back to Free. Payments aren't refunded for partly used months, and unused lookups don't roll over. If something went wrong, such as a double charge or the API being down for a long time, email aaron@soldstack.dev and we'll make it right. We'll tell you at least 30 days before changing the price of your plan.
What is the one-month pass?
$5 once for 1,000 lookups over 30 days, in Google Sheets, the API or AI agents. It isn't a subscription, so nothing renews and there is nothing to cancel.
Which marketplaces are covered?
Poshmark (US) and Poshmark Canada (CAD) sold listings. Mercari is paused. There is no eBay. See the Soldgraph comparison if you need more marketplaces.
I need a custom plan, or more than 60,000 a month.
Email aaron@soldstack.dev. That covers bulk valuation for a business and volumes above 60,000 a month.
Compared with Soldgraph
As of Oct 25, 2026. Prices are in US dollars a month, and the per-1,000 figures assume you use every lookup. Soldgraph covers more marketplaces than SoldStack, which has Poshmark US and Canada only (Mercari is paused). If you need eBay or several marketplaces, they are the better fit: SoldStack and Soldgraph side by side.
Price points
| Price | SoldStack | Soldgraph |
|---|---|---|
| $0 | Free: 100 every month$0 | Free: 100 once, no refill$0, then a paid plan |
| $5 once | One-month pass: 1,000 for 30 days$5.00 per 1,000 | None |
| $9 | Starter: 2,500 for $9$3.60 per 1,000 | Lite: 2,000 for $9$4.50 per 1,000 |
| $19 | None | Starter: 5,000 for $19$3.80 per 1,000 |
| $29 | Growth: 15,000 for $29$1.93 per 1,000 | None |
| $49 | None | Pro: 20,000 for $49$2.45 per 1,000 |
| $79 | Scale: 60,000 for $79$1.32 per 1,000 | None |
| $149 | None | Business: 100,000 for $149$1.49 per 1,000 |
| No plan | None | Pay as you go$10 per 1,000 |
What you'd pay at your volume
The cheapest way to get this many lookups in a month from each. Soldgraph's cheapest can be a smaller plan plus extra requests at $3 per 1,000.
| Lookups a month | Cheaper | SoldStack | Soldgraph |
|---|---|---|---|
| 1,000 | The same | $9Starter · $9.00 per 1,000 | $9Lite · $9.00 per 1,000 |
| 2,500 | SoldStack | $9Starter · $3.60 per 1,000 | $10.50Lite plus extra requests · $4.20 per 1,000 |
| 5,000 | Soldgraph | $29Growth · $5.80 per 1,000 | $18Lite plus extra requests · $3.60 per 1,000 |
| 10,000 | SoldStack | $29Growth · $2.90 per 1,000 | $33Lite plus extra requests · $3.30 per 1,000 |
| 20,000 | Soldgraph | $79Scale · $3.95 per 1,000 | $49Pro · $2.45 per 1,000 |
| 60,000 | SoldStack | $79Scale · $1.32 per 1,000 | $149Business · $2.48 per 1,000 |
| 100,000 | Soldgraph | Email usabove 60,000 | $149Business · $1.49 per 1,000 |
Soldgraph's numbers are from soldgraph.com and its docs on Oct 25, 2026: free 100 requests once, plans from $9 to $149, and extra requests at $10 per 1,000 without a plan or $3 on a paid one. Their docs also list a larger plan, which we left out. A request there is one search; a lookup here is one new search or one item in a list, and repeats within 6 hours are free on both. If anything is out of date, tell me and I'll fix it.