13,000+ Lots at 96% Sell-Through: Replacing a Homegrown Auction System Built in the 1990s

AuctionMethod initially pointed the company toward its standard SaaS platform. The company runs timed online sales a few times a year, and nothing about the format demanded custom work. What decided it was the requirement list: multi-state tax automation, card-brand-aware surcharging, combined buy-and-sell documentation for consignors who bid, and a single simultaneous close across several thousand lots. The co-owner asked for “maximum flexibility.” The scope shifted to a custom developed auction site to meet their unique needs, and the contract was signed after the owners sent through numbered questions on tax-integration scope and hosting warranty and got them answered point by point.

Payment is the part of the workflow that changed most. Bidders now register with a card on file — registration without one is disabled — and pay themselves from an emailed invoice link. Card surcharging runs off a BIN lookup that distinguishes debit from credit and applies state-level exemptions automatically, writing a private note to the invoice whenever it skips a charge. One capability was deliberately switched off: invoices generate automatically but are not auto-emailed and cards are never auto-charged, because the owners wanted the customer relationship to stay in their hands. Their own invoice email says so directly. Alongside it, tax runs through an Avalara integration built on a cash basis, so tax is finalized at payment in full rather than at invoice creation, with jurisdiction controls covering the states where the business collects and exemption-certificate handling for the buyers who need it.

The second build challenge was the close itself. This company closes its entire catalog at once: close to seven thousand lots on a 30-second extension timer, the way it has always run its sales. The first live close surfaced a bottleneck at that scale: extending the auction meant rewriting the end time on every item row several times per second. Rather than buy a larger database instance, AuctionMethod redesigned the close, shipping an auction type that extends the sale on a single auction-level end time instead of per item. A dedicated load-testing harness was built to prove it before the next sale. The company's second auction closed on the new architecture.

A hybrid timed auction type was added in the same period so staff can clerk phone bids directly into the online sale, and the bid gallery is now the homepage. The printed catalog had already been discontinued a year earlier as loss-making.

For an auction business whose entire year rests on a handful of high-volume closing nights, the question is never whether software can list inventory. It is whether the system will hold when several thousand lots close at once, and whether the money that follows can be collected without three weeks of manual work.

This company had built its own answer and run it for nearly thirty years. Replacing it took a custom build, not because timed online auctions are unusual, but because closing thousands of lots simultaneously, surcharging by card brand, and collecting tax across a dozen-plus states on a cash basis all had to be true at the same time.

Two auctions in, the business is invoicing at the volume it always ran, closed its first sale on the platform with no balance outstanding, and is measuring numbers it previously could not see.