# DetectZeStack, free: Cached company discovery API

> Find sites using a specific technology. The /lookup endpoint returns domains running Shopify, React, Cloudflare, or any of 7,300+ technologies from our scan database.

DetectZeStack's cached company discovery API on its Free plan. It costs $0.00 per 1,000 companies. It returns 1 of the 13 key fields we check: Technologies.
The cheapest of the 304 plans we rank by price is [Deepline, top-up](https://datacircle.dev/cached-company-discovery-apis/deepline/top-up/llms.txt). Deepline's cached company discovery API costs nothing beyond the plan price.
[GetProspect](https://datacircle.dev/cached-company-discovery-apis/getprospect/49-monthly/llms.txt), [Hunter](https://datacircle.dev/cached-company-discovery-apis/hunter/49-monthly/llms.txt) and [Skrapp](https://datacircle.dev/cached-company-discovery-apis/skrapp/349-monthly/llms.txt) are the best cached company discovery API providers in our benchmark.

- This page: https://datacircle.dev/cached-company-discovery-apis/detectzestack/free
- [Best company discovery API in 2026](https://datacircle.dev/best-company-discovery-api.txt)
- Get it: https://detectzestack.com/pricing
- Request: `GET https://detectzestack.com/lookup`
- API key: with the plan, on https://detectzestack.com/pricing
- Its API docs: https://detectzestack.com/openapi.yaml
- Sold by: DetectZeStack (https://detectzestack.com)
- Checked: 2026-10-27

## In the answer

- Completeness: 8%
- Technologies: ✓

## Price

- $ per 1,000 companies: $0.00
- Per: page, size not stated
- Billing: free

## Aggregators

- Aggregators: none

## Charges

- Also pays for: Create a tech change alert watch: 1 weekly alert · from the same budget: Analyze a URL · Batch analyze multiple URLs · Compare technology stacks · Get technology history · Technology change feed · Check if a website uses a specific technology · Vulnerability scan — CVEs for detected technologies · Check TLS certificate · DNS lookup · Security headers analysis

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Find sites using a specific technology. The /lookup endpoint returns domains running Shopify, React, Cloudflare, or any of 7,300+ technologies from our scan database.

## Data

- Freshness: stored
- Keep data: no limit
- Use data: You agree not to use the Service to: Submit URLs you do not have a legitimate research, security, monitoring, or business reason to inspect. Attempt to overwhelm, denial-of-service, or otherwise abuse our infrastructure or any third-party site we resolve on your behalf. Use the Service to facilitate illegal activity, harass any individual or organization, or violate the rights of any third party. Reverse-engineer, decompile, or otherwise extract the source code of the Service beyond what is exposed via the public API. Resell or sublicense the Service without our written permission.

## Plan

- Pay: $0
- You get: 100 requests a month
- Enough for: 100 pages a month
- Expires: at the start of each calendar month

## Rate limit

- Per second: 5
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: tech. Optional: limit, offset
- Method: GET
- Path: /lookup

## About the plan

- Plan: Free
- Who can get it: anyone with an account (a valid email address), no credit card

## The 6 fields the plan's answer can hold

domain, first seen date, last seen date, total results, technology name, response time

## DetectZeStack's plans (4)

- [DetectZeStack, free](https://datacircle.dev/cached-company-discovery-apis/detectzestack/free/llms.txt): $0.00 per 1,000, 8% complete, stored
- [DetectZeStack, $9 monthly](https://datacircle.dev/cached-company-discovery-apis/detectzestack/9-monthly/llms.txt): 8% complete, stored
- [DetectZeStack, $29 monthly](https://datacircle.dev/cached-company-discovery-apis/detectzestack/29-monthly/llms.txt): 8% complete, stored
- [DetectZeStack, $79 monthly](https://datacircle.dev/cached-company-discovery-apis/detectzestack/79-monthly/llms.txt): 8% complete, stored

## DetectZeStack's calls for this API (1)

- `GET /lookup`: [DetectZeStack, free](https://datacircle.dev/cached-company-discovery-apis/detectzestack/free/llms.txt)

## DetectZeStack's APIs (3)

- [DetectZeStack: cached company discovery API pricing, 4 plans](https://datacircle.dev/cached-company-discovery-apis/detectzestack/free/llms.txt)
- [DetectZeStack: cached tech stack API pricing, 4 plans, GET /analyze](https://datacircle.dev/cached-company-technology-apis/detectzestack/free-free-get-analyze/llms.txt)
- [DetectZeStack: cached tech stack API pricing, 4 plans, POST /analyze/batch](https://datacircle.dev/cached-company-technology-apis/detectzestack/free-free-post-analyze-batch/llms.txt)
- [DetectZeStack: cached tech stack API pricing, 4 plans, GET /check](https://datacircle.dev/cached-company-technology-apis/detectzestack/free-free-get-check/llms.txt)
- [DetectZeStack: cached tech stack API pricing, 4 plans, GET /history](https://datacircle.dev/cached-company-technology-apis/detectzestack/free-free-get-history/llms.txt)
- [DetectZeStack: cached tech stack API pricing, 4 plans, GET /changes](https://datacircle.dev/cached-company-technology-apis/detectzestack/free-free-get-changes/llms.txt)
- [DetectZeStack: tech stack API pricing, 4 plans](https://datacircle.dev/company-technology-apis/detectzestack/free/llms.txt)

## DetectZeStack: cached company discovery API alternatives

- [GetProspect, free](https://datacircle.dev/cached-company-discovery-apis/getprospect/free/llms.txt): $0.00 per 1,000, 62% complete, stored
- [Hunter, free, Free, POST /discover](https://datacircle.dev/cached-company-discovery-apis/hunter/free/llms.txt): $0.00 per 1,000, 54% complete, stored
- [AnyAPI, free, Starting balance, POST /v1/run/company_search.prospeo](https://datacircle.dev/cached-company-discovery-apis/anyapi/free-starting-balance-post-v1-run-company-search-prospeo/llms.txt): $0.00 per 1,000, 85% complete, stored
- [graph8, free](https://datacircle.dev/cached-company-discovery-apis/graph8/free/llms.txt): $0.00 per 1,000, 69% complete, stored

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-10-27.

- https://detectzestack.com
- https://detectzestack.com/openapi.yaml
- https://detectzestack.com/pricing
- https://detectzestack.com/terms