# NumisIQ

> NumisIQ is the ultimate currency database and marketplace for coin, banknote, token, and medal collectors worldwide. It provides a comprehensive catalog, marketplace, collection management, grading guides, counterfeit detection, and community forums.

## Core Features

- [Catalog](https://numisiq.com/catalog): Browse and search a comprehensive database of coins, banknotes, tokens, and medals from countries worldwide. Each entry includes denomination, year, composition, mintage, images, and rarity index.
- [Marketplace](https://numisiq.com/marketplace): Buy, sell, and trade numismatic items with verified sellers. Supports fixed-price, auction, and swap listing types.
- [Collections](https://numisiq.com/collections): Create and manage personal collections, track specimens with grades, provenance, and estimated values.
- [Grading Guides](https://numisiq.com/grading-guides): Learn the standardized grading scale from Poor (P-1) to Mint State (MS-70) with reference images.
- [Country Reference](https://numisiq.com/country-reference): Explore numismatic history, currencies, and catalog items organized by country with maps and flag icons.
- [Counterfeit Checker](https://numisiq.com/counterfeit-checker): AI-powered counterfeit detection tool to verify coin authenticity by analyzing images.
- [Counterfeit Gallery](https://numisiq.com/counterfeit-gallery): Community-curated gallery of known counterfeit examples with key identifying features.
- [Forums](https://numisiq.com/forums): Community discussion boards for collectors covering identification, valuation, and collecting strategies.
- [Events](https://numisiq.com/events): Discover numismatic fairs, auctions, exhibitions, and meetings worldwide.

## Key Details

- Website: https://numisiq.com
- Purpose: Numismatic database, marketplace, and collector community
- Coverage: Coins, banknotes, tokens, and medals from all countries
- Grading: Supports Sheldon scale (P-1 to MS-70) with PCGS and NGC cross-references
- Rarity Index: Proprietary 0-100 score based on mintage figures
- Languages: English, French, Spanish, German, Chinese
- Authentication: Email-based signup with collector and dealer account types