Snowpack Numismatics publishes its inventory and auction calendar in machine-readable formats so price-comparison tools, dealer aggregators, AI search engines, and feed-reading collectors don't have to scrape the HTML. Stable schemas, generous cache windows, no auth required.
Available feeds
/api/inventory.jsonJSONEvery for-sale coin with full metadata: denomination, year, type, variation, grade, grading company, CAC status, price, image URLs, listing date, and canonical URL. Supports query filters: denomination, since (ISO date), cac (yes/no), grading_co (pcgs/ngc/cacg/anacs), key_date (yes), min_price, max_price, min_year, max_year, min_grade, q (search text), sort (newest/oldest/price_asc/price_desc/grade_asc/grade_desc), limit (max 1000), and offset.
/api/inventory.csvCSVSame data as the JSON feed, one row per coin, lowercase_underscore column names. Imports cleanly into Excel, Google Sheets, Numbers, and database tables. Supports the same query parameters and sorting filters as the JSON feed.
/feed/new-arrivals.xmlRSS 2.0The 50 most recent listings, with title, image enclosure, denomination category, listing date. Compatible with Feedly, NetNewsWire, Inoreader, RSS-fueled IFTTT/Make automations.
/feed/auctions.xmlRSS 2.0Every auction the site has visibility on, with status (live / preview / closed), close time in ET, lot count. Useful for collectors who want a calendar nudge before each sale.
/feed/journal.xmlRSS 2.0The 50 most recent field notes, articles, and coin observations. Includes titles, summaries, publication dates, categories/tags, and hero images.
/sitemap.xmlXML SitemapAuto-generated from inventory + visible auctions + content pages, priority-tuned. Listed in /robots.txt for discovery.
Caching + rate limits
The JSON and CSV feeds are cached for 5 minutes; the RSS feeds for 10 minutes. Hit them as often as you want — there's no per-IP rate limit, but please respect Cache-Control headers. Repeat crawls inside the cache window are served from the edge for free.
Schema stability
The JSON feed declares a feed_version at the top of every response. We'll increment it for breaking changes (renamed or removed fields). Additive changes (new optional fields) won't bump the version. Build against the documented schema, not field order.
License + attribution
Inventory metadata (everything except photographs) may be freely indexed, cached, redistributed, and re-displayed for comparison, search, price-research, and aggregation purposes — with attribution to snowpackcoins.com. We're happy to be in your dataset.
Coin photographs remain copyright Snowpack Numismatics. Cache + display thumbnails freely; please don't hot-link production traffic to our origin (it costs us bandwidth) or re-publish at full resolution without permission. If you're building something where photos matter, email mike@snowpackcoins.com — we're probably fine with it, just want to know.
Want more?
Need a different format, additional fields, webhook pings on new listings, or a private API key for higher-volume polling? Email Mike — Snowpack runs on a custom stack and we can usually accommodate.