Don't pay too much.

Real coin prices. Current trends. Auction history.

Coins, Banknotes, the Whole World.

  • Prompt detection. Browsing the auctions, you can quickly see historical records of specific lots.
  • Advanced search options. Including: denomination, currency, country, year or period, condition, grading, phrase and auction platform. Includes bullion coins and investment bars.
  • Charts. Archive results presented in graphs.
  • Analysis and decision. Filter and sort data as you like to make informed decisions before making your purchases.
Bidsy Extension - Coin and Banknotes auction prices

Why Bidsy?

Everything you need for smarter collecting

Bidsy gives you the tools and data to make confident collecting decisions, whether you are buying, selling, or just tracking the market.

Real Auction Prices

See actual final sale prices from completed auctions, not estimates or asking prices. Every result comes from a real transaction.

Auto-Detection Extension

Our browser extension automatically recognizes coins and banknotes while you browse Allegro and OneBid auctions. No clicks needed.

Advanced Filtering

Search by year, currency, country, denomination, condition, NGC/PMG grading, and more. Find exactly what you are looking for.

Price Charts & Trends

Track how prices evolve over time with interactive charts. Spot trends, identify undervalued items, and time your purchases.

Allegro & OneBid

Works across the two largest Polish auction platforms. One search, two markets, complete coverage.

Savings

Saves time and money. Supports taking right decisions. Start exploring real market data today.

By the Numbers

The breadth of what we track

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Denominations

Coin and banknote denominations recognized and catalogued

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Currencies

Historical and modern currencies from across the globe

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Countries & Territories

Nations, empires and territories throughout history

Coming Soon

Medals Join the Archive

We are expanding the Bidsy price archive to include medals and decorations. Track auction prices, discover rare pieces, and research the market — just like you already do with coins and banknotes.

Get in Touch

Have a feature request, a question, or just want to share feedback? We'd love to hear from you — every message helps us make Bidsy better.