# WhatCMS, free, 500 Detections, GET /API/Theme: Cached tech stack API

> Detect which theme WordPress sites are using

WhatCMS's cached tech stack API on its 500 Detections plan. It costs $0.00 per 1,000 companies. It returns none of the 13 key fields we check: Technology, Categories, When and where seen, Spend and 9 more.
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/whatcms/free-500-detections-get-api-theme
- [Best cached tech stack API in 2026](https://datacircle.dev/best-cached-tech-stack-api.txt)
- Get it: https://whatcms.org/API/Plans
- Request: `GET https://www.themedetect.com/API/Theme`
- API key: with the plan, on https://whatcms.org/API/Plans
- Its API docs: https://whatcms.org/Documentation
- Sold by: WhatCMS (https://whatcms.org)
- Checked: 2026-10-27

## In the answer

- Completeness: 0%

## Price

- $ per 1,000 companies: $0.00
- Per: call
- Billing: free

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: Technology Detection · Host Detection

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Detect which theme WordPress sites are using

## Data

- Freshness: stored
- Keep data: for caching purposes only
- Use data: You may view, download for caching purposes only, and print pages from the website, provided that: (a) you must not republish material from this website (including republication on another website), or reproduce or store material from this website in any public or private electronic retrieval system, (b) you must not reproduce, duplicate, copy, sell, resell, visit, or otherwise exploit our website or material on our website for a commercial purpose, without our express written consent [...] you agree not to reproduce, duplicate, copy, sell, resell or exploit for any commercial purposes, any aspect of the Service

## Plan

- Pay: $0
- You get: 500 requests a month
- Enough for: 500 calls a month

## Rate limit

- Per second: 0.1
- Batch: 1

## Speed

- Answer: in the call
- Median: 4.34 s

## The call

- You send: url
- Method: GET
- Path: /API/Theme

## About the plan

- Plan: 500 Detections
- Who can get it: anyone with an account, one account each

## The 14 fields the plan's answer can hold

request URL, result code, result message, last checked, theme URI, theme name, theme author, theme author URI, theme version, theme license, theme license URI, theme template, theme description, theme tags

## WhatCMS's plans (14)

- [WhatCMS, free, 500 Detections, GET /API/Theme](https://datacircle.dev/cached-company-technology-apis/whatcms/free-500-detections-get-api-theme/llms.txt): $0.00 per 1,000, 0% complete, stored
- [WhatCMS, $20 monthly, 10,000 Detections, GET /API/Theme](https://datacircle.dev/cached-company-technology-apis/whatcms/20-monthly-10000-detections-get-api-theme/llms.txt): $2.00 per 1,000, 0% complete, stored
- [WhatCMS, $40 monthly, 20,000 Detections, GET /API/Theme](https://datacircle.dev/cached-company-technology-apis/whatcms/40-monthly-20000-detections-get-api-theme/llms.txt): $2.00 per 1,000, 0% complete, stored
- [WhatCMS, $80 monthly, 50,000 Detections, GET /API/Theme](https://datacircle.dev/cached-company-technology-apis/whatcms/80-monthly-50000-detections-get-api-theme/llms.txt): $1.60 per 1,000, 0% complete, stored
- [WhatCMS, $150 monthly, 100,000 Detections, GET /API/Theme](https://datacircle.dev/cached-company-technology-apis/whatcms/150-monthly-100000-detections-get-api-theme/llms.txt): $1.50 per 1,000, 0% complete, stored
- [WhatCMS, $300 monthly, 200,000 Detections, GET /API/Theme](https://datacircle.dev/cached-company-technology-apis/whatcms/300-monthly-200000-detections-get-api-theme/llms.txt): $1.50 per 1,000, 0% complete, stored
- [WhatCMS, $360 monthly, 300,000 Detections, GET /API/Theme](https://datacircle.dev/cached-company-technology-apis/whatcms/360-monthly-300000-detections-get-api-theme/llms.txt): $1.20 per 1,000, 0% complete, stored
- [WhatCMS, $450 monthly, 400,000 Detections, GET /API/Theme](https://datacircle.dev/cached-company-technology-apis/whatcms/450-monthly-400000-detections-get-api-theme/llms.txt): $1.125 per 1,000, 0% complete, stored
- [WhatCMS, $500 monthly, 500,000 Detections, GET /API/Theme](https://datacircle.dev/cached-company-technology-apis/whatcms/500-monthly-500000-detections-get-api-theme/llms.txt): $1.00 per 1,000, 0% complete, stored
- [WhatCMS, $600 monthly, 600,000 Detections, GET /API/Theme](https://datacircle.dev/cached-company-technology-apis/whatcms/600-monthly-600000-detections-get-api-theme/llms.txt): $1.00 per 1,000, 0% complete, stored
- [WhatCMS, $650 monthly, 700,000 Detections, GET /API/Theme](https://datacircle.dev/cached-company-technology-apis/whatcms/650-monthly-700000-detections-get-api-theme/llms.txt): $0.929 per 1,000, 0% complete, stored
- [WhatCMS, $720 monthly, 800,000 Detections, GET /API/Theme](https://datacircle.dev/cached-company-technology-apis/whatcms/720-monthly-800000-detections-get-api-theme/llms.txt): $0.90 per 1,000, 0% complete, stored
- [WhatCMS, $760 monthly, 900,000 Detections, GET /API/Theme](https://datacircle.dev/cached-company-technology-apis/whatcms/760-monthly-900000-detections-get-api-theme/llms.txt): $0.844 per 1,000, 0% complete, stored
- [WhatCMS, $800 monthly, 1,000,000 Detections, GET /API/Theme](https://datacircle.dev/cached-company-technology-apis/whatcms/800-monthly-1000000-detections-get-api-theme/llms.txt): $0.80 per 1,000, 0% complete, stored

## WhatCMS's calls (3)

- `GET /API/Host`: [WhatCMS, free, 500 Detections, GET /API/Host](https://datacircle.dev/cached-company-technology-apis/whatcms/free-500-detections-get-api-host/llms.txt)
- `GET /API/Tech`: [WhatCMS, free, 500 Detections, GET /API/Tech](https://datacircle.dev/cached-company-technology-apis/whatcms/free-500-detections-get-api-tech/llms.txt)
- `GET /API/Theme`: [WhatCMS, free, 500 Detections, GET /API/Theme](https://datacircle.dev/cached-company-technology-apis/whatcms/free-500-detections-get-api-theme/llms.txt)

## WhatCMS's APIs (1)

- [WhatCMS: cached tech stack API pricing, 14 plans, GET /API/Theme](https://datacircle.dev/cached-company-technology-apis/whatcms/free-500-detections-get-api-theme/llms.txt)

## WhatCMS: cached tech stack API alternatives

- [Tomba, $1,791 yearly](https://datacircle.dev/cached-company-technology-apis/tomba/1791-yearly/llms.txt): $1.244 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
- [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://whatcms.org
- https://whatcms.org/API/Plans
- https://whatcms.org/Documentation
- https://whatcms.org/Support
- https://whatcms.org/Terms
- https://www.themedetect.com/Support