Rare Index
Data Sources
Where our data comes from — and why every price is traceable.
Our Commitment to Data Integrity
Rare Index integrates licensed APIs, verified marketplace transaction feeds, auction records, and formal category-specific data partnerships. Data inputs are classified into primary pricing feeds (directly used in canonical price construction), validation references (used for integrity cross-checking), and benchmark indices (displayed for contextual comparison only).
We maintain three non-negotiable principles:
Full source provenance.
Every price record in our system is traceable to its originating platform, data feed, and timestamp. There are no orphaned numbers. If a price appears on Rare Index, you can verify where it came from.
Compliant data acquisition.
All data integrations are established through official APIs, licensed data feeds, or formal partnership agreements. Rare Index does not engage in unauthorized scraping or violate platform terms of service.
Multi-source cross-validation.
Where possible, pricing data is validated across multiple independent sources to identify and flag discrepancies before they reach our indices.
How We Categorize Sources
Rare Index integrates data across five source types, each serving a distinct role in our data architecture:
Transaction Platforms
Marketplaces and auction venues where collectibles are actively bought and sold. Verified transaction prices from these platforms serve as primary market signals for index construction and trend analysis.
Specialized Pricing Providers
Dedicated data companies that aggregate, clean, and standardize pricing information for specific collectible categories. Depending on licensing frameworks, these providers contribute either as direct index inputs or as reference benchmarks displayed alongside proprietary Rare Index indices.
Reference Benchmarks
Third-party indices and analytics platforms whose data is displayed alongside Rare Index proprietary indices for contextual market comparison, with full attribution. Reference benchmarks provide market context without directly contributing to Rare Index index calculations.
Catalog & Reference Data
Sources that provide asset metadata - specifications, production details, grading information, and identification data - that enriches our item profiles without directly contributing to price calculations.
Benchmark Data
Traditional financial market data (S&P 500, NASDAQ, Bitcoin, Gold) used for relative performance comparisons. These benchmarks contextualize collectibles within the broader investment landscape.
Data Usage & Licensing
Rare Index maintains a diversified data architecture designed to ensure no single-source dependency. Market inputs are classified by usage rights and integrated according to their specific licensing frameworks.
Not all data sources contribute to index construction in the same way. Some sources provide the primary transaction data that directly powers our proprietary indices. Others serve as licensed reference benchmarks displayed alongside Rare Index indices for contextual comparison — with full attribution to the originating platform. Additional sources may contribute exclusively to internal processes such as confidence scoring, cross-validation, and quality assurance without appearing in public-facing outputs.
This tiered approach ensures that Rare Index respects the licensing terms of every data partner while maintaining the broadest possible market coverage for our users.
Source Directory
Each source is grouped by category with its role and coverage scope.
Trading Cards
5 sources| Name | Category | Type | Description |
|---|---|---|---|
| PriceCharting | Cards | Pricing Provider | Comprehensive pricing database covering sports cards, Pokemon, Yu-Gi-Oh!, and other TCGs. Our largest single data source for cards with 258,000+ tracked items. Provides historical pricing, sales data, and market trends. |
| JustTCG | Cards | Pricing Provider | Real-time TCG pricing aggregator covering Pokemon, Magic: The Gathering, and other trading card games. Contributes 40,000+ items with current market valuations. |
| SportsCardsPro | Cards | Pricing Provider | Specialized sports card pricing focused on graded card valuations across baseball, basketball, football, and hockey. Provides PSA and BGS price points for investment-grade cards. |
| TCGplayer | Cards | Transaction Platform | Marketplace and pricing reference for trading card singles and sealed products. Used as a direct market source for card valuations and source-level verification. |
| eBay (Cards) | Cards | Transaction Platform | Verified completed transaction data from the world's largest collectibles marketplace. eBay sales serve as the broadest real-time price discovery mechanism for trading cards across all categories. |
Luxury Watches
4 sources| Name | Category | Type | Description |
|---|---|---|---|
| TheWatchAPI | Watches | Pricing Provider | Luxury watch market data covering secondary market pricing for premium timepieces. Provides current valuations and specifications for tracked watch models. |
| WatchCharts | Watches | Pricing Provider | Secondary market analytics for luxury watches, tracking price movements across major brands including Rolex, Patek Philippe, Audemars Piguet, and Omega. |
| Major Auction Houses (Historical Auction Results) | Watches | Transaction Platform | Christie's · Sotheby's · Phillips · Antiquorum · Bruun Rasmussen · Eppli · Ineichen · Monaco Legend Auctions · Bukowskis. Coverage: 333,979 auction lots (1988–2026). Category: Watches (Auction Comps). Auction results represent historical transaction prices and do not reflect current market value. |
| eBay (Watches) | Watches | Transaction Platform | Verified completed sales data for luxury watches, providing broad market price discovery across brands, conditions, and seller types. |
Toys & LEGO
3 sources| Name | Category | Type | Description |
|---|---|---|---|
| PriceCharting (Toys) | Toys | Pricing Provider | Pricing database for collectible toys including action figures, Funko Pops, and vintage toys. Provides historical sales data and current market valuations. |
| BrickEconomy | Toys | Pricing Provider | Specialized LEGO market analytics covering set valuations, price trends, and investment metrics. Tracks new, used, and sealed LEGO set pricing across the secondary market. |
| eBay (Toys) | Toys | Transaction Platform | Verified completed transaction data for collectible toys and LEGO, providing the broadest real-time market pricing for the toys category. |
Video Games
2 sources| Name | Category | Type | Description |
|---|---|---|---|
| PriceCharting (Video Games) | Video Games | Pricing Provider | Pricing coverage for retro and modern video game titles, including cartridge and disc markets with historical sales references and current market snapshots. |
| eBay (Video Games) | Video Games | Transaction Platform | Verified completed transaction data for video games and related formats, used for broad market price discovery and cross-source validation. |
Traditional Benchmarks
4 sources| Name | Category | Type | Description |
|---|---|---|---|
| S&P 500 | Benchmark | Benchmark | Standard & Poor's 500 index - the primary benchmark for U.S. large-cap equity performance. Used for relative performance comparison against collectible asset classes. |
| NASDAQ Composite | Benchmark | Benchmark | Technology-weighted market index. Provides context for comparing collectibles against growth-oriented traditional assets. |
| Bitcoin (BTC) | Benchmark | Benchmark | Leading digital asset by market capitalization. Included as a benchmark given the overlap between alternative asset investors and cryptocurrency participants. |
| Gold (XAU) | Benchmark | Benchmark | Traditional store-of-value benchmark. Gold provides the most direct comparison for collectibles positioned as tangible alternative assets. |
Data Pipeline & Quality
Raw data from our sources passes through a multi-stage pipeline before reaching our indices:
Ingestion
Data is collected daily via automated API integrations and scheduled imports. Each record is tagged with its source, timestamp, and ingestion batch identifier.
Normalization
Pricing data is standardized across sources to ensure consistent formatting, currency denomination, and categorization. Items are mapped to our canonical item registry to prevent duplication.
Validation
Automated quality gates flag anomalies including extreme price deviations (>3 standard deviations), missing fields, duplicate records, and source attribution gaps. Flagged records are quarantined for review before inclusion.
Provenance Tracking
Every record that passes validation retains full source metadata throughout its lifecycle. Source attribution is never stripped or aggregated away - it persists from ingestion through index calculation to the user-facing display.
Daily Audit
Our operations team performs daily data audits verifying record counts, source distribution, NULL rates, and cross-source consistency. Audit results are logged and retained.
Coverage Summary
A snapshot of our current data footprint across categories and benchmarks.
627,000+
Total items tracked across all categories
17
Active data sources
607,000+
Daily price records
74M+
Historical data points
5
Asset categories - Cards, Watches, Toys, Video Games, Other
4
Traditional benchmarks - S&P 500, NASDAQ, Bitcoin, Gold
Coverage depth varies by category based on data availability, licensing frameworks, and the maturity of each collectible market's data ecosystem. Our index methodologies are designed to operate transparently across categories with differing levels of data depth.
Coverage is expanding continuously as we onboard new data partnerships and deepen existing integrations.
Partnership & Integration
Rare Index actively partners with data providers across the collectibles ecosystem. Our partnership model is built on mutual value:
What we provide to partners
- Full source attribution on every asset page with direct links to the partner's platform.
- A dedicated listing on this Data Sources page.
- Referral traffic from our cross-category collector and investor audience.
- Rare Index is not a marketplace - attribution links drive potential buyers directly to partner platforms.
What we seek from partners
- Licensed or authorized access to pricing data via API or structured data feeds.
- Ongoing data availability to support market intelligence operations — including index construction, benchmark comparison, and validation processes as permitted by licensing terms.
- Collaboration on data quality, accuracy standards, and mutually beneficial data usage frameworks.
If you are a data provider in trading cards, luxury watches, toys, video games, or adjacent collectible categories and are interested in a partnership, contact us at support@therareindex.com.
Compliance & Ethics
No single-source dependency exists within index construction. Rare Index does not engage in unauthorized scraping or violate platform terms of service. All data usage complies with applicable licensing agreements.
No unauthorized scraping.
All data is obtained through official channels - APIs, licensed feeds, or formal agreements.
Terms of service compliance.
We review and comply with the terms of service of every platform we integrate with.
Attribution transparency.
Every data source is publicly credited on this page and on individual asset pages throughout the platform.
No data resale.
Rare Index does not resell or redistribute raw source data. Our product is the proprietary intelligence layer - indices, analytics, and market signals - constructed from multiple classes of market inputs in compliance with each source's licensing framework.