동전 및 수집품 경매 플랫폼 개발

We connect directly to the PCGS and NGC APIs to pull certification data in real time. When a seller enters a cert number, the platform automatically retrieves the coin's grade, designation, true-view images, and population data. No manual entry, no transcription errors — and bidders get verified authenticity before they ever place a bid.

Population data is the census of how many coins have been graded at each condition level by PCGS or NGC. "Pop 5 in MS-68" means exactly five examples exist at that grade. Showing this on lot pages gives bidders immediate rarity context, which tends to push bids higher on scarce coins and builds the kind of trust that keeps consignors coming back.

Yes. We build multi-category platforms that handle PCGS/NGC for coins and PSA/BGS/SGC for sports cards. Each category gets its own attribute schema — mint mark and variety for coins, player and set for cards — while sharing the same bidding engine, payment system, and user accounts. One platform, multiple verticals.

We build anti-sniping extensions that automatically add time — typically 2–5 minutes, configurable — whenever a bid lands in the final seconds. Every bidder gets a fair chance to respond. Combined with proxy bidding, this produces better realized prices and a noticeably better experience for both buyers and consignors.

The platform supports configurable buyer's premiums (typically 15–25%), tiered seller commissions based on lot value or consignment volume, and promotional fee overrides for special events. Payments run through Stripe with escrow holds until delivery is confirmed. Payout schedules to consignors run automatically on whatever cycle you define.

A full-featured platform with real-time bidding, PCGS/NGC integration, price history, and payment processing typically takes 8–10 weeks. Simpler timed-auction builds without live streaming can launch in 6. We scope everything upfront with a fixed fee so there aren't surprises halfway through development.