How to Do Bulk Product Lookups with the EcomSource API

Looking up products one at a time works for small-scale applications, but what if you need to process thousands or millions of identifiers? Here's how to use EcomSource's batch capabilities for maximum throughput.

Batch Endpoint

The bulk endpoint accepts up to 20 identifiers per call (mix ASIN, UPC, EAN, or GTIN):

curl -X POST "https://api.ecomsource.ai/api/v1/search/bulk?locale=US" \
  -H "X-Access-Key: your_access_key" \
  -H "X-Secret-Key: your_secret_key" \
  -H "Content-Type: application/json" \
  -d '[
    { "identifier": "B08N5WRWNW", "identifierType": "asin" },
    { "identifier": "194252017883", "identifierType": "upc" },
    { "identifier": "B09V3KXJPB", "identifierType": "asin" }
  ]'

Async Processing Pattern

For very large datasets (10K+ products), use an async worker pattern:

Step 1: Queue Your Requests Split your identifier list into chunks of 100 and add them to a processing queue.

Step 2: Process in Parallel Run multiple workers that pull from the queue and call the batch endpoint. We recommend 5-10 concurrent workers to stay within rate limits.

Step 3: Collect Results Store results in your database as they come back. Track which batches succeeded and which need retry.

Rate Limiting

• Free: 10 requests/minute
• Starter: 60 requests/minute
• Pro: 200 requests/minute
• Enterprise: Custom limits

Performance Tips

1. 1Use batch endpoints: 1 batch request of 100 items is faster than 100 individual requests
2. 2Implement caching: Product identifiers rarely change — cache results for 24-48 hours
3. 3Handle errors gracefully: Some identifiers may not have matches. Don't let one failure stop the entire batch
4. 4Monitor throughput: Track your requests per minute to optimize worker count

Example: Processing a CSV of 50,000 ASINs

const BATCH_SIZE = 100;

async function processCSV(asins) { const batches = chunk(asins, BATCH_SIZE); const results = []; for (let i = 0; i < batches.length; i += CONCURRENT_WORKERS) { const concurrent = batches.slice(i, i + CONCURRENT_WORKERS); const batchResults = await Promise.all( concurrent.map(batch => lookupBatch(batch)) ); results.push(...batchResults.flat()); } return results; } ```

With this approach, 50,000 ASINs can be processed in under 10 minutes on a Pro plan.

---

Queries already finding EcomSource on Google (Search Console)

These are real searches where ecomsource.ai already earns impressions — prioritize the same topics in your tooling and content:

• asin to upc api — 139 impressions
• b2b data api — 121 impressions
• b2b api — 52 impressions
• product data api — 36 impressions
• amazon product advertising api official 2026 — 27 impressions
• amazon api product — 26 impressions
• amazon product advertising api current status 2026 — 22 impressions
• amazon product data api — 22 impressions
• amazon product advertising api 2026 — 21 impressions
• best amazon product data api 2026 — 20 impressions

Related searches: UPC, barcode & product identifier keywords

This section expands on How to Do Bulk Product Lookups with the EcomSource API with search terms sellers and developers use — including queries from Google Search Console and our keyword research. Whether you need asin to upc api, product data api, gtin vs upc, b2b data api, or bulk barcode lookup, the workflows below connect to EcomSource tools.

Upc lookup

Upc lookup is one of the highest-intent searches in product data — and it is exactly what this guide on *How to Do Bulk Product Lookups with the EcomSource API* helps you solve. Sellers and developers use upc lookup to identify products, validate supplier manifests, and connect barcodes to Amazon ASINs. With EcomSource.ai you can run upc lookup free on the web, via [Chrome Extension](https://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb)Chrome Extensionhttps://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb, or through our barcode lookup API/bulk-barcode-lookup across 1.6B+ indexed products.

Upc code lookup

Upc code lookup is one of the highest-intent searches in product data — and it is exactly what this guide on *How to Do Bulk Product Lookups with the EcomSource API* helps you solve. Sellers and developers use upc code lookup to identify products, validate supplier manifests, and connect barcodes to Amazon ASINs. With EcomSource.ai you can run upc code lookup free on the web, via [Chrome Extension](https://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb)Chrome Extensionhttps://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb, or through our barcode lookup API/bulk-barcode-lookup across 1.6B+ indexed products.

Upc finder

Upc finder is one of the highest-intent searches in product data — and it is exactly what this guide on *How to Do Bulk Product Lookups with the EcomSource API* helps you solve. Sellers and developers use upc finder to identify products, validate supplier manifests, and connect barcodes to Amazon ASINs. With EcomSource.ai you can run upc finder free on the web, via [Chrome Extension](https://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb)Chrome Extensionhttps://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb, or through our barcode lookup API/bulk-barcode-lookup across 1.6B+ indexed products.

Upc code

Upc code is one of the highest-intent searches in product data — and it is exactly what this guide on *How to Do Bulk Product Lookups with the EcomSource API* helps you solve. Sellers and developers use upc code to identify products, validate supplier manifests, and connect barcodes to Amazon ASINs. With EcomSource.ai you can run upc code free on the web, via [Chrome Extension](https://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb)Chrome Extensionhttps://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb, or through our barcode lookup API/bulk-barcode-lookup across 1.6B+ indexed products.

Barcode lookup

Barcode lookup is one of the highest-intent searches in product data — and it is exactly what this guide on *How to Do Bulk Product Lookups with the EcomSource API* helps you solve. Sellers and developers use barcode lookup to identify products, validate supplier manifests, and connect barcodes to Amazon ASINs. With EcomSource.ai you can run barcode lookup free on the web, via [Chrome Extension](https://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb)Chrome Extensionhttps://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb, or through our barcode lookup API/bulk-barcode-lookup across 1.6B+ indexed products.

Barcode of a product

Barcode of a product is one of the highest-intent searches in product data — and it is exactly what this guide on *How to Do Bulk Product Lookups with the EcomSource API* helps you solve. Sellers and developers use barcode of a product to identify products, validate supplier manifests, and connect barcodes to Amazon ASINs. With EcomSource.ai you can run barcode of a product free on the web, via [Chrome Extension](https://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb)Chrome Extensionhttps://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb, or through our barcode lookup API/bulk-barcode-lookup across 1.6B+ indexed products.

Upc codes

Upc codes is one of the highest-intent searches in product data — and it is exactly what this guide on *How to Do Bulk Product Lookups with the EcomSource API* helps you solve. Sellers and developers use upc codes to identify products, validate supplier manifests, and connect barcodes to Amazon ASINs. With EcomSource.ai you can run upc codes free on the web, via [Chrome Extension](https://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb)Chrome Extensionhttps://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb, or through our barcode lookup API/bulk-barcode-lookup across 1.6B+ indexed products.

Sku lookup

Sku lookup is one of the highest-intent searches in product data — and it is exactly what this guide on *How to Do Bulk Product Lookups with the EcomSource API* helps you solve. Sellers and developers use sku lookup to identify products, validate supplier manifests, and connect barcodes to Amazon ASINs. With EcomSource.ai you can run sku lookup free on the web, via [Chrome Extension](https://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb)Chrome Extensionhttps://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb, or through our barcode lookup API/bulk-barcode-lookup across 1.6B+ indexed products.

Product barcode

Product barcode is one of the highest-intent searches in product data — and it is exactly what this guide on *How to Do Bulk Product Lookups with the EcomSource API* helps you solve. Sellers and developers use product barcode to identify products, validate supplier manifests, and connect barcodes to Amazon ASINs. With EcomSource.ai you can run product barcode free on the web, via [Chrome Extension](https://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb)Chrome Extensionhttps://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb, or through our barcode lookup API/bulk-barcode-lookup across 1.6B+ indexed products.

Upc number lookup

Upc number lookup is one of the highest-intent searches in product data — and it is exactly what this guide on *How to Do Bulk Product Lookups with the EcomSource API* helps you solve. Sellers and developers use upc number lookup to identify products, validate supplier manifests, and connect barcodes to Amazon ASINs. With EcomSource.ai you can run upc number lookup free on the web, via [Chrome Extension](https://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb)Chrome Extensionhttps://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb, or through our barcode lookup API/bulk-barcode-lookup across 1.6B+ indexed products.

Gtin lookup

Gtin lookup is one of the highest-intent searches in product data — and it is exactly what this guide on *How to Do Bulk Product Lookups with the EcomSource API* helps you solve. Sellers and developers use gtin lookup to identify products, validate supplier manifests, and connect barcodes to Amazon ASINs. With EcomSource.ai you can run gtin lookup free on the web, via [Chrome Extension](https://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb)Chrome Extensionhttps://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb, or through our barcode lookup API/bulk-barcode-lookup across 1.6B+ indexed products.

International product code

International product code is one of the highest-intent searches in product data — and it is exactly what this guide on *How to Do Bulk Product Lookups with the EcomSource API* helps you solve. Sellers and developers use international product code to identify products, validate supplier manifests, and connect barcodes to Amazon ASINs. With EcomSource.ai you can run international product code free on the web, via [Chrome Extension](https://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb)Chrome Extensionhttps://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb, or through our barcode lookup API/bulk-barcode-lookup across 1.6B+ indexed products.

Terminology & search intent reference

Understanding *why* a query matters helps you pick the right tool. High-volume navigational searches like upc lookup (22K+), upc code lookup (15K+), and barcode lookup (12K+) expect an instant free tool. Commercial queries such as barcode lookup api, upc api, and bulk barcode lookup expect documentation, pricing, and batch endpoints — all available on EcomSource.

Additional long-tail searches in this topic cluster

• api shoes
• barcode search api
• go upc api

Free lookup tools on EcomSource.ai

• [BULK lookup tools](/bulk-barcode-lookup)
• [API lookup tools](/product-data-api)

• [All guides & blog posts](/blogs)
• [API documentation](/docs)
• [Pricing for high-volume barcode lookup](/pricing)

Frequently asked questions

Product data api?

Product data api is one of the highest-intent searches in product data — and it is exactly what this guide on *How to Do Bulk Product Lookups with the EcomSource API* helps you solve. Sellers and developers use product data api to identify products, validate supplier manifests, and connect barcodes to Amazon ASINs. With EcomSource.ai you can run product data api free on the web, via [Chrome Extension](https://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb)Chrome Extensionhttps://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb, or through our barcode lookup API/bulk-barcode-lookup across 1.6B+ indexed products. Use the free search on [ecomsource.ai](https://www.ecomsource.ai)ecomsource.aihttps://www.ecomsource.ai or read the related sections above for step-by-step workflows tied to Tutorial.

Amazon product advertising api official 2026?

Amazon product advertising api official 2026 is one of the highest-intent searches in product data — and it is exactly what this guide on *How to Do Bulk Product Lookups with the EcomSource API* helps you solve. Sellers and developers use amazon product advertising api official 2026 to identify products, validate supplier manifests, and connect barcodes to Amazon ASINs. With EcomSource.ai you can run amazon product advertising api official 2026 free on the web, via [Chrome Extension](https://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb)Chrome Extensionhttps://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb, or through our barcode lookup API/bulk-barcode-lookup across 1.6B+ indexed products. Use the free search on [ecomsource.ai](https://www.ecomsource.ai)ecomsource.aihttps://www.ecomsource.ai or read the related sections above for step-by-step workflows tied to Tutorial.

Amazon api product?

Amazon api product is one of the highest-intent searches in product data — and it is exactly what this guide on *How to Do Bulk Product Lookups with the EcomSource API* helps you solve. Sellers and developers use amazon api product to identify products, validate supplier manifests, and connect barcodes to Amazon ASINs. With EcomSource.ai you can run amazon api product free on the web, via [Chrome Extension](https://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb)Chrome Extensionhttps://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb, or through our barcode lookup API/bulk-barcode-lookup across 1.6B+ indexed products. Use the free search on [ecomsource.ai](https://www.ecomsource.ai)ecomsource.aihttps://www.ecomsource.ai or read the related sections above for step-by-step workflows tied to Tutorial.

Amazon product advertising api current status 2026?

Amazon product advertising api current status 2026 is one of the highest-intent searches in product data — and it is exactly what this guide on *How to Do Bulk Product Lookups with the EcomSource API* helps you solve. Sellers and developers use amazon product advertising api current status 2026 to identify products, validate supplier manifests, and connect barcodes to Amazon ASINs. With EcomSource.ai you can run amazon product advertising api current status 2026 free on the web, via [Chrome Extension](https://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb)Chrome Extensionhttps://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb, or through our barcode lookup API/bulk-barcode-lookup across 1.6B+ indexed products. Use the free search on [ecomsource.ai](https://www.ecomsource.ai)ecomsource.aihttps://www.ecomsource.ai or read the related sections above for step-by-step workflows tied to Tutorial.

Amazon product data api?

Amazon product data api is one of the highest-intent searches in product data — and it is exactly what this guide on *How to Do Bulk Product Lookups with the EcomSource API* helps you solve. Sellers and developers use amazon product data api to identify products, validate supplier manifests, and connect barcodes to Amazon ASINs. With EcomSource.ai you can run amazon product data api free on the web, via [Chrome Extension](https://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb)Chrome Extensionhttps://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb, or through our barcode lookup API/bulk-barcode-lookup across 1.6B+ indexed products. Use the free search on [ecomsource.ai](https://www.ecomsource.ai)ecomsource.aihttps://www.ecomsource.ai or read the related sections above for step-by-step workflows tied to Tutorial.

Amazon product advertising api 2026?

Amazon product advertising api 2026 is one of the highest-intent searches in product data — and it is exactly what this guide on *How to Do Bulk Product Lookups with the EcomSource API* helps you solve. Sellers and developers use amazon product advertising api 2026 to identify products, validate supplier manifests, and connect barcodes to Amazon ASINs. With EcomSource.ai you can run amazon product advertising api 2026 free on the web, via [Chrome Extension](https://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb)Chrome Extensionhttps://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb, or through our barcode lookup API/bulk-barcode-lookup across 1.6B+ indexed products. Use the free search on [ecomsource.ai](https://www.ecomsource.ai)ecomsource.aihttps://www.ecomsource.ai or read the related sections above for step-by-step workflows tied to Tutorial.

Best amazon product data api 2026?

Best amazon product data api 2026 is one of the highest-intent searches in product data — and it is exactly what this guide on *How to Do Bulk Product Lookups with the EcomSource API* helps you solve. Sellers and developers use best amazon product data api 2026 to identify products, validate supplier manifests, and connect barcodes to Amazon ASINs. With EcomSource.ai you can run best amazon product data api 2026 free on the web, via [Chrome Extension](https://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb)Chrome Extensionhttps://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb, or through our barcode lookup API/bulk-barcode-lookup across 1.6B+ indexed products. Use the free search on [ecomsource.ai](https://www.ecomsource.ai)ecomsource.aihttps://www.ecomsource.ai or read the related sections above for step-by-step workflows tied to Tutorial.

Best amazon product data api 2026 comparison?

Searchers looking for best amazon product data api 2026 comparison usually need fast, accurate product identification — not a generic description. EcomSource supports this query as part of unified UPC, EAN, GTIN, and ISBN lookup/bulk-barcode-lookup with Amazon catalog mapping, variation trees, and bulk batch endpoints. Use the free search on [ecomsource.ai](https://www.ecomsource.ai)ecomsource.aihttps://www.ecomsource.ai or read the related sections above for step-by-step workflows tied to Tutorial.

Amazon api to get product details?

Searchers looking for amazon api to get product details usually need fast, accurate product identification — not a generic description. EcomSource supports this query as part of unified UPC, EAN, GTIN, and ISBN lookup/bulk-barcode-lookup with Amazon catalog mapping, variation trees, and bulk batch endpoints. Use the free search on [ecomsource.ai](https://www.ecomsource.ai)ecomsource.aihttps://www.ecomsource.ai or read the related sections above for step-by-step workflows tied to Tutorial.

Amazon product advertising api official documentation 2026?

Searchers looking for amazon product advertising api official documentation 2026 usually need fast, accurate product identification — not a generic description. EcomSource supports this query as part of unified UPC, EAN, GTIN, and ISBN lookup/bulk-barcode-lookup with Amazon catalog mapping, variation trees, and bulk batch endpoints. Use the free search on [ecomsource.ai](https://www.ecomsource.ai)ecomsource.aihttps://www.ecomsource.ai or read the related sections above for step-by-step workflows tied to Tutorial.

Step-by-step: run your first lookup after reading this guide

1. 1Copy a UPC, EAN, GTIN, ISBN, or ASIN from packaging or your supplier sheet.
2. 2Open [ecomsource.ai](/) or a dedicated tool page ([UPC lookup](/upc-lookup), [barcode lookup](/barcode-lookup), [GTIN](/gtin-lookup), [ISBN](/isbn-lookup)).
3. 3Paste the code and search — results include brand, title, images, and Amazon identifiers.
4. 4For lists of 20+ codes, use [bulk barcode lookup](/bulk-barcode-lookup) via the API ([docs](/docs)).
5. 5Pin the [Chrome Extension](https://chromewebstore.google.com/detail/upc-lookup/pglhhlcbcbmfebnagjgmbchpmgokbmpb) for on-page Amazon/Walmart lookups.

Why EcomSource for barcode & UPC data

Competitors excel at single-purpose pages; EcomSource combines free online lookup, Amazon-native ASIN mapping, variation intelligence, and real-time bulk barcode lookup in one platform. If you are outgrowing BarcodeLookup pricing, Go-UPC email bulk turnaround, or EAN-Search rate limits, start with a free account/signup and run your first asin to upc api in seconds.

Try free UPC & barcode lookup →/

Get API keys for bulk search →/signup