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Learn, Compare, and Build With kwery

Technical guides for teams building marketplace data, pricing, and commerce systems.

Explainers

New to Marketplace Data?

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Ecommerce Data, Explained

A foundational guide to marketplace prices, offers, sellers, availability and data infrastructure.

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Marketplace Data API

How structured marketplace data enters pricing systems, warehouses and applications.

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Marketplace Data Infrastructure

Collection, product resolution, normalization, validation, delivery and monitoring, the architecture behind the API.

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GTIN, ASIN, UPC and EAN Explained

The identifiers behind marketplace products, and why reliable matching is more than a barcode lookup.

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Real-Time vs Historical Marketplace Data

Choosing the right freshness and retention model for each decision.

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Comparisons

Evaluating Your Options?

Build vs Buy

Decide which parts of marketplace acquisition your team should build, which infrastructure can be managed, and where the handoff to your systems should sit.

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Build vs Buy Marketplace Data Infrastructure

A layer-by-layer framework for deciding which parts of marketplace data infrastructure belong inside your stack.

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Managed Marketplace Data vs Web Scraping

Own the collection pipeline, or consume the resulting marketplace data.

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Marketplace Data API vs Scraping API

Two APIs, two layers. What each actually removes from your workload.

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Building Crawlers vs Building on kwery

An architecture comparison for teams considering an internal crawler stack.

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Proxy Infrastructure vs Managed Data

What proxies solve, and what remains above them.

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Alternatives and Evaluation

Compare marketplace data providers on relevant source coverage, product identity, normalization, decision safety, provenance, detected change, delivery and true cost per usable dataset.

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Don't Compare APIs. Compare What Your System Can Safely Build On

Evaluate marketplace data providers on source relevance, identity, normalization, trust, provenance, detected change, delivery and effective dataset cost.

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Multi-marketplace data

PriceAPI and kwery

Two multi-source marketplace-data architectures compared on coverage, trust, delivery and dataset economics.

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Google Shopping-centric

ShoppingScraper and kwery

Google Shopping intelligence compared with direct multi-marketplace data infrastructure.

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Source-specialized APIs

Traject Data and kwery

A family of dedicated marketplace APIs compared with one normalized data layer.

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SEO + commerce data

DataForSEO and kwery

A broad search-data platform with ecommerce endpoints compared with a dedicated marketplace data layer.

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Amazon history

Keepa and kwery

Deep Amazon history and tracking compared with current multi-marketplace production data.

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Amazon data API

Rainforest API and kwery

A specialized Amazon data API compared with a normalized multi-marketplace data layer.

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Alternative Architectures

Some teams are deciding between marketplace-data infrastructure and lower-level web collection infrastructure rather than between two marketplace-data providers.

Scraping infrastructure