Coin and jewelry buyers regrade every lot in their heads before they bid. Fake a grade, guess a price on a slabbed key-date, and you don’t just lose the lot — you lose the room for good. Hammerwerks drafts the listing, and on the calls it can’t make, it says so out loud.
The nightmare in this business is software that fills in a grade or a price it can’t possibly know from a phone photo. You approve it, a buyer with a loupe catches it, and your whole catalog reads like a bluff. So ours doesn’t do that.
From your photos it drafts the title, description, and category, pre-fills the structured fields, and can flag a visible mint mark or hallmark for you to confirm — each field with a confidence score. A second AI reviews the draft. You approve every lot. It saves the typing, not the deciding.
No software can call authenticity, grade, or condition on a key-date coin, a loose diamond, or a signed piece from a photo — and ours won’t pretend to. That stays with a grader like PCGS or NGC, and with you. Saying so to a sharp buyer is exactly how you keep them.
On thin or high-value lots with no clean comps, the honest answer is often no estimate at all. When the AI can’t stand on real comps it tells you so instead of printing a fantasy range your bidders will laugh at. You set the opening bid. Your credibility here is the whole business — guard it.
A generic “title and description” box buries the one thing a coin or jewelry buyer actually searches on — the date, the mint mark, the cert number, the karat stamp — inside a paragraph nobody can filter. Hammerwerks asks the right question per lot and stores the answer as data.
Structured fields for date, mint mark, denomination, composition, and the grade you assign — raw or slabbed. If it’s in a PCGS or NGC holder, record the grade and cert number as data a bidder can filter and verify, not prose they have to squint at.
Karat, metal, gram weight, stone type and carat, and hallmark — each its own field. Melt-driven lots and signed pieces catalog the same fast way, and you can look up a maker’s mark and confirm it yourself instead of trusting a guess.
Shoot obverse and reverse, the date, the mint mark, the karat stamp, the maker’s mark. Unlimited photos per lot, and bidders zoom in to read a hallmark or a date themselves — on a small coin or jewelry lot, that’s often the thing that closes the bid.
You’re holding other people’s money on high-value lots. The disputes are sharper, the payouts are bigger, and one statement that settles wrong follows you around town. Here’s the spine that keeps it clean.
The consignor who disputes the commission on a $12k gold lot six weeks later is a real evening you’ll never get back. So they sign the consignment agreement electronically and you countersign. The signed doc is fingerprinted and the signing recorded — tamper-evident, so you can prove later that nothing changed. The settlement statement settles against that contract, so the commission and fees can’t drift.
Paying a consignor for a $9k gold lot before the buyer’s wire clears is how good houses go under. The funds-available gate won’t let you pay out a lot until the buyer’s money for it is collected; partial payouts settle on what’s actually in. Per-seller commission rates, so a mixed tray of consignors settles in one sale.
Every sale balances — money in equals payouts plus your commission and premium plus tax plus what’s still owed. See how much consignor money you’re holding at a glance. Pay a consignor by check or electronically and record it. Then export the ledger and pull a per-consignor 1099 worksheet and a sales-tax report at year end — instead of a shoebox in January.
Good coin and jewelry buyers are worth more than any single sale. On someone else’s marketplace, that list is quietly becoming their asset, not yours. Here it stays yours.
The bidder catalog is branded on your own domain, and the list you build stays yours — export it anytime. Straight talk: we won’t out-reach HiBid or Proxibid on raw registered-bidder audience. Their pools are huge and ours is small. Our edge is the workflow and the fact that the list is yours to keep.
On a strong gold or key-date coin sale, a percentage house skims 5–8% of gross off the top. We take none of it — no commission on the hammer, ever. You pay a flat monthly tier by how many lots you run — Solo $99 (200 lots), Growth $299 (1,000), Scale $799 (5,000), 50¢/lot above that — plus a one-time $499 setup that’s waived with a promo code. Ask about Founding Customer terms on your intro call.
Cataloging a 400-coin estate alone is a week you don’t have. Hand a helper a revocable capture link — no login — and they shoot lots straight into your workbench from a phone. And if you’d rather talk to the thing than click it, you can run the whole sale from ChatGPT.
No, and don’t trust any vendor that says otherwise. It drafts the listing and can flag a visible mint mark or date for you to confirm, but grade and authenticity stay with you or a third-party service like PCGS or NGC. If a coin is slabbed, record the grade and cert number and the AI drafts the rest around it.
It offers a value range only when it has real comps to stand on, with a confidence score attached. On a stone it can’t assess from a photo, it tells you it doesn’t know — and you set an opening bid instead. With this crowd, no estimate beats a fabricated one every time.
The agreement they signed. It’s tamper-evident — the signed document is fingerprinted and the signing is recorded — so you can prove the copy they signed is the copy you settled against, and that nothing changed in between. The settlement statement is computed straight off that contract, so the rate and fees can’t drift. (It’s provable, not a substitute for legal advice.)
Not by accident, which is the point. The funds-available gate won’t release a lot’s payout until the buyer’s money for it is collected — Stripe, or a cash, check, or wire you record. Partial payouts settle on collected funds. You never front your own money on an invoice that hasn’t landed.
Send a scoped, revocable capture link — no login. They shoot lots straight into your workbench from a phone. It’s a shared link you can turn off, not a per-person secure account, so hand it out with that in mind.
Less scrambling. Every sale reconciles, you can see the trust balance you’re holding for consignors, and at year end you pull a per-consignor 1099 worksheet and a sales-tax remittance report. Export the whole ledger to a spreadsheet too — that’s a CSV, not a live QuickBooks or Xero sync we haven’t built.
Honestly, we don’t win on reach — they have huge registered-bidder pools and we have very few. If audience is your whole game, they’re the answer. We win on cataloging speed, keeping your bidder list yours, and pricing with no hammer cut. Watch the 90-second demo or book a call and bring a tray of coins to catalog live.
Ask about Founding Customer terms on your intro call. 30-day money-back. Full data export any time.
Start free