How AI Cataloging Tools Charge: Lot, Photo, or Sale

Short answer: AI auction cataloging tools charge in four distinct ways — a flat fee per lot, a monthly subscription tier, a percentage of your auction sales, or bundled into an all-in-one platform price — and the four aren't comparable, so the first step in any pricing comparison is figuring out which model you're looking at. Here's the taxonomy, with real prices and the math at typical volumes.

The four charging models

Per lot. You pay a flat amount for each lot you catalog, with no monthly commitment. Gavelist charges $0.15 per lot with no minimum — the bill tracks exactly how much you catalog. Per-photo pricing is a close cousin you'll occasionally see, but for auction work per-lot is the more common and more predictable unit, since a lot may carry several photos.

Monthly tiers. You pay a fixed monthly fee for a ceiling of lots or listings. According to AuctionWriter's published pricing, plans run free for 50 lots/month, $99/month up to 1,000 lots, and $189/month up to 2,200. Estimint runs a free trial, then $29/month for 300 listings and $89/month for 1,500. You pay the tier price whether you fill it or not.

Percentage of sales. Some auction platforms charge a cut of your proceeds. HiBid's AuctionFlex 360 charges an online bidding fee of 2% of gross auction proceeds — a bidding-platform fee on the hammer price, not a cataloging charge, but a cost that comes out of the same sale. This one scales with your revenue rather than your lot count.

Bundled platform. All-in-one systems fold cataloging into a single platform price alongside CRM, invoicing, and bidding. Circuit Auction AI bundles AI cataloging this way and doesn't publish standalone cataloging pricing, because cataloging isn't sold on its own — you're paying for the platform.

The math at 300 lots a month

Say you catalog 300 lots in a month:

• Per lot (Gavelist): 300 × $0.15 = $45.
• Monthly tier (Estimint $29 / 300 listings): $29, if you stay at or under the ceiling.
• Monthly tier (AuctionWriter $99 / up to 1,000): $99, most of which is headroom you're not using at 300.
• Percentage of sales (HiBid 2%): on a $50,000 sale, $1,000 — but this is a bidding-platform fee, a separate line item from cataloging, not an alternative to it (full breakdown: does HiBid charge a percentage of sales?).

The math at 1,000 lots a month

Now scale up to 1,000 lots:

• Per lot (Gavelist): 1,000 × $0.15 = $150.
• Monthly tier (AuctionWriter $99 / up to 1,000): $99 — the tier is efficient here, because you're near its ceiling.
• Monthly tier (Estimint): you'd be on the $89 / 1,500 plan, so $89.
• Percentage of sales (HiBid 2%): still a function of revenue, not lots — on a $150,000 month, $3,000 — and still a different line item from any cataloging price.

Notice the pattern: monthly tiers win when you fill them (near 1,000 lots), per-lot wins when you don't (300 lots, or a swinging volume that averages low). And the percentage-of-sales number never belongs in the same column as the others.

Why the models don't compare directly

The core mistake in cataloging pricing is comparing a per-lot or per-month fee against a percentage of sales as if they measured the same thing. They don't: according to AIM (2025), the manual labor these tools replace runs 15–25 lots per hour at $14–$28/hour — a cataloging cost, measured in lots and time. And according to AuctionWriter's own estate-auction-fees analysis (2025), that cataloging labor runs $25–$45 per hour per crew member. A 2% bidding fee is measured in revenue. A $45 cataloging bill and a $1,000 bidding fee are answering different questions. Gavelist charges only for cataloging ($0.15/lot) and takes 0% of auction sales, which keeps those two questions cleanly separate.

Bottom line

Before comparing prices, identify the model: per lot, monthly tier, percentage of sales, or bundled platform. Per-lot and monthly-tier are the two you can compare head-to-head on cataloging cost — and which wins depends on whether you fill the tier. Percentage-of-sales and bundled-platform pricing answer different questions and belong in their own columns. Get the model straight first, and the numbers start meaning something.

Run your own numbers: cost calculator · pricing · HiBid integration.