# DetectZeStack, free, Free, GET /changes: Cached tech stack API

> The /changes API gives you a queryable feed of every technology change, with tier-gated history up to 365 days.

DetectZeStack's cached tech stack API on its Free plan. It costs $0.00 per 1,000 companies. It returns 2 of the 13 key fields we check: Technology, Categories.
The cheapest of the 113 plans we rank by price is [DetectZeStack, $79 monthly, Mega, POST /analyze/batch](https://datacircle.dev/cached-company-technology-apis/detectzestack/79-monthly-mega-post-analyze-batch/llms.txt), at $0.158 per 1,000 companies.
[Tomba](https://datacircle.dev/cached-company-technology-apis/tomba/449-monthly/llms.txt), [DetectZeStack](https://datacircle.dev/cached-company-technology-apis/detectzestack/79-monthly-mega-get-analyze/llms.txt) and [WhatCMS](https://datacircle.dev/cached-company-technology-apis/whatcms/500-monthly-500000-detections-get-api-tech/llms.txt) are the best cached tech stack API providers in our benchmark.

- This page: https://datacircle.dev/cached-company-technology-apis/detectzestack/free-free-get-changes
- [Best cached tech stack API in 2026](https://datacircle.dev/best-cached-tech-stack-api.txt)
- Get it: https://detectzestack.com/pricing
- Request: `GET https://detectzestack.com/changes`
- 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: 15%
- Technology: ✓
- Categories: ✓

## Price

- $ per 1,000 companies: $0.00
- Per: call
- 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 · Check if a website uses a specific technology · Reverse technology lookup — find sites using a 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: The /changes API gives you a queryable feed of every technology change, with tier-gated history up to 365 days.

## 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 calls 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: nothing required. Optional: domain
- Method: GET
- Path: /changes

## About the plan

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

## The 9 fields the plan's answer can hold

change ID, domain, technology name, change type, technology category, previous version, new version, snapshot ID, change date

## DetectZeStack's plans (4)

- [DetectZeStack, free, Free, GET /changes](https://datacircle.dev/cached-company-technology-apis/detectzestack/free-free-get-changes/llms.txt): $0.00 per 1,000, 15% complete, stored
- [DetectZeStack, $9 monthly, Pro, GET /changes](https://datacircle.dev/cached-company-technology-apis/detectzestack/9-monthly-pro-get-changes/llms.txt): $9.00 per 1,000, 15% complete, stored
- [DetectZeStack, $29 monthly, Ultra, GET /changes](https://datacircle.dev/cached-company-technology-apis/detectzestack/29-monthly-ultra-get-changes/llms.txt): $2.90 per 1,000, 15% complete, stored
- [DetectZeStack, $79 monthly, Mega, GET /changes](https://datacircle.dev/cached-company-technology-apis/detectzestack/79-monthly-mega-get-changes/llms.txt): $1.58 per 1,000, 15% complete, stored

## DetectZeStack's calls for this API (6)

- `GET /analyze`: [DetectZeStack, free, Free, GET /analyze](https://datacircle.dev/cached-company-technology-apis/detectzestack/free-free-get-analyze/llms.txt)
- `POST /analyze/batch`: [DetectZeStack, free, Free, POST /analyze/batch](https://datacircle.dev/cached-company-technology-apis/detectzestack/free-free-post-analyze-batch/llms.txt)
- `GET /check`: [DetectZeStack, free, Free, GET /check](https://datacircle.dev/cached-company-technology-apis/detectzestack/free-free-get-check/llms.txt)
- `GET /history`: [DetectZeStack, free, Free, GET /history](https://datacircle.dev/cached-company-technology-apis/detectzestack/free-free-get-history/llms.txt)
- `GET /changes`: [DetectZeStack, free, Free, GET /changes](https://datacircle.dev/cached-company-technology-apis/detectzestack/free-free-get-changes/llms.txt)
- `GET /site`: [DetectZeStack, $29 monthly, Ultra, GET /site](https://datacircle.dev/cached-company-technology-apis/detectzestack/29-monthly-ultra-get-site/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 /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 tech stack API alternatives

- [WhatCMS, $80 monthly, 50,000 Detections, GET /API/Tech](https://datacircle.dev/cached-company-technology-apis/whatcms/80-monthly-50000-detections-get-api-tech/llms.txt): $1.60 per 1,000, 23% complete, stored
- [Tomba, $199 monthly](https://datacircle.dev/cached-company-technology-apis/tomba/199-monthly/llms.txt): $1.658 per 1,000, 15% complete, stored
- [The Swarm, $96,000 yearly](https://datacircle.dev/cached-company-technology-apis/the-swarm/96000-yearly/llms.txt): $4.00 per 1,000, 38% complete, stored
- [TechnologyChecker, $2,490 yearly, Scale, GET /v1/domain/{domain}/history](https://datacircle.dev/cached-company-technology-apis/technologychecker/2490-yearly-scale-get-v1-domain-domain-history/llms.txt): $4.15 per 1,000, 23% 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