Online auction software
that works on your website
BidJS by Bidlogix is the online auction software used by fine art, antiques, industrial, real estate, and charity auctioneers worldwide. Embed on your existing website. Keep your brand, your bidders, and your data.
What is BidJS?
BidJS is a JavaScript embed that adds real-time online auction bidding to any existing website. Unlike shared marketplace platforms where your auctions live on someone else's domain, BidJS runs on your domain — under your brand name, with your bidders' data stored in your account. When you're ready to install it, follow the BidJS setup routes.
BidJS supports both timed online auctions and live webcast auctions. Timed auctions run fully automated with preset closing times; webcast auctions connect remote internet bidders to a live auction room in real time. Both formats run concurrently on the same infrastructure, so you can mix formats across your sale calendar without any additional setup.
Six pillars of the BidJS platform
Real-time bidding
BidJS uses WebSocket connections to push bid updates to every connected bidder in real time. No page refresh, no polling — bids arrive instantly. The WebSocket infrastructure handles 40x more connected users than long-polling, and scales for the largest online auction events.
Auction formats
Timed auctions with lot staggering, soft-close overtime, max bid autobid, Reserve Gauge, Buy Now, Make Offer, and Private Treaty. Webcast auctions with simultaneous floor, phone, and internet bidding. All formats are configurable per sale and can be combined across your auction calendar.
Bidder management
Registration approval workflows, refundable deposit collection via Stripe, red-flag suspension, and full audit trails. All of it — bid history, registration decisions, payment records — belongs to you and is exportable any time.
Payments & invoicing
BidJS handles the post-auction invoicing workflow: buyer's premium calculation, itemised invoice generation and delivery, VAT/tax handling, and invoice status tracking. Collect payment through your own channels and record it against each invoice, with Stripe available for deposit processing and Xero for accounting.
Data & analytics
Performance dashboards per auction, lot-level analytics (views, bids, bid-to-view ratio), bidder activity reports, and auction health metrics. Export everything to CSV or your preferred accounting format. Your data is never used by Bidlogix for any purpose beyond delivering the service.
Security & compliance
Signature-based API authentication (BDXAPI_NAME header), redundant multi-zone infrastructure, GDPR-compliant data handling, and full bidder data portability — with enterprise SLA guarantees available. Security is built into the architecture — not bolted on afterwards.
BidJS vs the alternatives
Why auction houses choose BidJS over shared marketplaces and custom builds.
| Feature | Basic marketplace | Custom build | BidJS by Bidlogix |
|---|---|---|---|
| Your branding | ✗ Marketplace brand | ✓ Fully custom | ✓ Fully branded |
| Data ownership | ✗ Platform owns data | ✓ You own data | ✓ You own all data |
| Setup time | ~1 day | 3–12 months | ~2–5 days |
| Ongoing cost | Commission per sale | Dev team required | Per-lot or subscription |
| Commission on sales | ✗ 5–20%+ | ✓ None | ✓ None |
| Reliability | Shared infrastructure | Depends on team | SLA-backed uptime |
| Support | Ticket-based | Internal team | Dedicated + portal |
Pricing overview
Two pricing models with no commission on sales. Your hammer price and buyer's premium stay with you.
Pay only for lots you sell. No minimum commitment. Full BidJS feature set included. Ideal for auction houses running occasional sales or exploring online bidding for the first time.
Get pricing →Unlimited lots per month. Dedicated infrastructure option, priority support SLA, enterprise SSO, and OEM reseller pricing available. For high-volume auction houses and technology platforms.
Get pricing →Frequently asked questions
Used by leading auction houses
Ready to take your auctions online?
Book a free demo and see how BidJS online auction software works for your catalogue and your audience.