Spot the bullion deals hiding in auction catalogs.

Auctions are one of the best ways to buy metal below retail. Reputable houses run estate and collection sales all the time, across Canada, the US, and beyond, online and in the room. The deals are there because attention isn't evenly spread. Online sales often run for a week, and the crowd piles onto the headline pieces while plenty of solid bullion gets bid up far less. Almost every past catalog we've checked had lots that sold under retail, and some under spot. The only hard part is the math. Buyer's premium and shipping change what a lot really costs, and a single catalog can hide a hundred of them. That's the part the app does for you, in seconds, across the catalog.

Yes. This is exactly who it's built for. You don't need to know melt math or premiums. Upload a catalog and your lots are graded for you against live spot and typical retail, so you can see what's a real deal and what isn't. Best of all, it gives you a max bid you can trust on each lot. So when the bidding heats up you stick to your number instead of getting emotional and paying too much. That confidence is the whole point.

It is your stack inventory: one place to keep everything you own, whoever you bought it from. A coin shop, a dealer, a gift, a bar you have had for twenty years. For each piece you record what it is, the metal, weight and purity, how many, and optionally what you paid and when. The app then shows what the metal is worth today, what it was worth the day you bought it, and the difference between the two. Every row also has a magnifying glass that looks up current dealer prices and live eBay listings for the same kind of piece, searching only on what the item is and never on your notes or what you paid. Bring over a spreadsheet you already keep, mark things sold, and export the whole thing to CSV whenever you want. A free account holds 15 holdings. One holding is one entry, not one coin, so 100 maples added as a single entry count as one. Paid plans hold 75, 200, or as many as you like.

Yes. There's a full step-by-step guide on the How it works page. It walks you through using the tool in plain language: uploading your catalog, reading the grades, setting the buyer's premium and shipping, and finding your max bid. It also covers Quick Check (value a single coin or bar), the eBay price comparisons, and the saved-catalog library. That guide starts from the point where you already have your catalog file. Getting the file off the auction site is covered separately here in the FAQ: see Where do I get the catalog file? and the step-by-step save-as-PDF instructions. And if anything is still unclear, just send us a question and we'll walk you through it.

It turns watchers into bidders. A lot of metal buyers follow auctions but hold back because they can't tell a good lot from a trap, or don't trust their own math on premium and shipping. BullionBidder gives them a number they trust, so they bid instead of lurking. When they run your catalog, every lot is read and graded, so the good bullion gets found, including the quiet lots that usually draw little attention. And because they trust their numbers, they bid more freely and follow through. That means more active bidding and fewer no-shows. The one thing we need is your catalog read cleanly. If you'd like to make sure your format parses well, get in touch.

No. BullionBidder is a pre-bid analysis tool. It does not connect to any auction house's bidding system. You place your own bids directly with the auction house (online, by phone, or however that auction takes bids). BullionBidder is your prep work: we compute all-in costs, compare to spot and retail, flag the best deals, and pull live eBay listings for similar pieces, so you bid knowing the numbers. The bidding stays in your hands.

Yes. Most auction catalogs are a mix, and that's fine. Upload the whole thing as it comes. The app reads every lot and sorts the ones that aren't bullion (banknotes, base-metal items, coin supplies, jewelry without a stated weight, household goods) into their own buckets, then grades only the bullion that's worth valuing. You don't have to clean up the file or pull anything out first. Those non-bullion lots are free. You're only charged a credit for a lot that's bullion or uncertain, so a mixed estate catalog costs you nothing for the banknotes and the bric-a-brac. A typical catalog is about 30% non-bullion, and you pay for none of it.

Yes, and no credit card. The free plan covers three separate things, so it is worth saying what each one gives you. Reading catalogues: 400 credits a month, about one or two typical catalogues. One credit covers one bullion-or-uncertain lot, non-bullion lots cost nothing, and Quick Check is always free. You can keep one saved catalogue at a time. Your vault: 15 holdings, with every feature the paid plans have. Import, export, the charts, the insurance schedule, comps lookups, sold tracking. Nothing in the vault is locked behind a plan, only how much you may keep. Everything else: live prices for all four metals, both languages, the value calculator, the whole blog. Paying raises those numbers rather than unlocking a better app. Stacker holds 75 holdings, Pro holds 200 and adds 2,000 credits, a library of as many saved catalogues as you like and the printable bid sheet, and Pro Plus is an unlimited vault with 5,000 credits.

Auction houses publish them. We don't provide catalog data, you bring your own. The best file to use, when the house offers it, is a "Printable Lots Listing" or a catalog download. Look for a button or link like "Printable Lot List," "Print Catalog," "Download Catalog," or an Excel/CSV export. These give a clean, simple list of every lot, which the app reads most accurately. Most houses post their catalogs as downloadable PDFs or Excel/CSV exports. If yours only shows the catalog on its website with no printable listing, print the page straight to a PDF and upload that, no extra software needed (Print → Save as PDF is built into Windows, macOS, Linux, and ChromeOS). We have step-by-step instructions that show you exactly how. We accept PDF, Excel (.xlsx / .xls), CSV, and TSV.

Auction houses that publish catalogs as a PDF, Excel/CSV export, or printable web page, whether the house is global, regional, or online-only. The app reads a wide range of formats. If it doesn't read yours yet, tell us and we add support fast.

We compare the all-in price (your bid + buyer's premium + shipping + any tax you add) against two things: the live spot price of the metal, and a typical dealer-retail price for that product. A lot has to beat both to grade well.

Necessity is the mother of invention. We were bidding on bullion ourselves, doing the math by hand, lot by lot, and it was slow and easy to get wrong in the heat of a live sale. We tried the popular AI chatbots. They got us partway, but none could read a whole catalog or hold the true all-in cost (bid plus buyer's premium plus shipping, plus any tax you add) steady across hundreds of lots. So we built the tool we actually needed. Since then we have won real lots at spot and below dealer retail. One of them, a Ghostbusters silver bar we broke down with every number on the table, shows exactly how the math played out on a real win, and we have just as often walked away from lots that looked like deals but weren't once the fees were added in. That is the whole point: know your real maximum bid before the sale, so it is a lot harder to overpay in the heat of it.

Your original file (PDF, Excel, or CSV) stays in your browser. The original file is never stored. For PDFs, only the plain text is sent over briefly to finish reading it, then it's thrown away. For some lots whose text is incomplete, the app also looks at that lot's image to fill the gap: it sends the image to read whatever the text was missing (such as weight or fineness), then it's gone. We never copy, republish, or store the image. Spreadsheets stay entirely on your device. What we do keep is the catalog data you choose to save to your library: the metal, weight, and grade we worked out for each lot, the lot descriptions so you can see what each lot was, plus any corrections you made. That's the catalog data, not the original file. Free and Stacker keep your latest catalog, Pro and Pro Plus keep your whole library, and it stays until you delete it. We also keep your tracked bids, and a results cache stored under your own account that expires on its own after 30 days. Everything is encrypted, you can delete any of it any time, and deleting your account erases all of it. Nothing sold, nothing shared.