# Agent Data Tools, free: Tech stack API

> Detect the technologies behind a website from its home page HTML and response headers: CMS or site builder (WordPress, Shopify, Webflow…), JavaScript framework (Next.js, Nuxt, React…), analytics and ad pixels, support widgets, payments, captcha, CDN and hosting, web server and backend language, each with the evidence that matched.

Agent Data Tools's Free calls plan for the tech stack API costs $0.00 per 1,000 companies. We check each provider's docs for 13 fields. Agent Data Tools's docs list 2: Technology, Categories.
We haven't run Agent Data Tools through [our tech stack API benchmark](https://datacircle.dev/best-tech-stack-api.txt) yet.
This plan is free. We rank 450 plans for tech stack APIs by price. Half the plans cost $7.155 or less per 1,000 companies. [See the best free tech stack API plan.](https://datacircle.dev/best-tech-stack-api.txt)
[cl0q's $50 monthly plan](https://datacircle.dev/company-technology-apis/cl0q/50-monthly/llms.txt) is the cheapest paid plan per 1,000 companies: $0.0042. [Enterno's ₽2,511 yearly plan](https://datacircle.dev/company-technology-apis/enterno/2511-yearly-explorer-get-api-v4-cms/llms.txt) costs the least for 10,000 companies a month: about $2.50.
[GetProspect's $49 monthly plan](https://datacircle.dev/company-technology-apis/getprospect/49-monthly/llms.txt) covers any number of companies. GetProspect's $49 monthly plan costs less up front than cl0q's $50 monthly plan.
[JobsPipe](https://datacircle.dev/company-technology-apis/jobspipe/149-monthly-growth-post-v1-stack-scan/llms.txt), [DetectZeStack](https://datacircle.dev/company-technology-apis/detectzestack/79-monthly-mega-get-analyze/llms.txt) and [GetProspect](https://datacircle.dev/company-technology-apis/getprospect/49-monthly/llms.txt) are the best tech stack API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/company-technology-apis/agent-data-tools/free
- [Company technologies API: tech stack APIs compared](https://datacircle.dev/best-tech-stack-api.txt)
- Get it: https://agent-data-tools.revmesh2074.workers.dev/tools?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- Request: `GET https://agent-data-tools.revmesh2074.workers.dev/tech/stack`
- API key: not needed
- Its API docs: https://agent-data-tools.revmesh2074.workers.dev/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing#/paths/~1tech~1stack
- Sold by: Agent Data Tools (https://agent-data-tools.revmesh2074.workers.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing)
- Checked: 2026-11-09

## In the answer

- Completeness: 15%
- Technology: ✓
- Categories: ✓

## Price

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

## Aggregators

- Aggregators: none

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Detect the technologies behind a website from its home page HTML and response headers: CMS or site builder (WordPress, Shopify, Webflow…), JavaScript framework (Next.js, Nuxt, React…), analytics and ad pixels, support widgets, payments, captcha, CDN and hosting, web server and backend language, each with the evidence that matched.

## Data

- Freshness: live
- Keep data: no limit
- Use data: Do not use the service for anything unlawful, to harm others, or to overload it. Keep your API key private, anyone with it can spend its credits.

## Plan

- Pay: $0
- You get: 25 requests
- Enough for: 25 calls

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: url
- Method: GET
- Path: /tech/stack

## About the plan

- Plan: Free calls
- Who can get it: anyone, 25 free successful calls per caller with no key or account (trial=1 on a GET request), at most 2,000 free calls a day in total

## The 10 fields the plan's answer can hold

url, technologies, technology name, technology category, evidence, technologies by category, generator, server, powered by, technology count

## Agent Data Tools's plans (6)

- [Agent Data Tools, free](https://datacircle.dev/company-technology-apis/agent-data-tools/free/llms.txt): $0.00 per 1,000, 15% complete, live
- [Agent Data Tools, pay as you go](https://datacircle.dev/company-technology-apis/agent-data-tools/pay-as-you-go/llms.txt): $10.00 per 1,000, 15% complete, live
- [Agent Data Tools, $1 pack](https://datacircle.dev/company-technology-apis/agent-data-tools/1-pack/llms.txt): $10.00 per 1,000, 15% complete, live
- [Agent Data Tools, $5 pack](https://datacircle.dev/company-technology-apis/agent-data-tools/5-pack/llms.txt): $10.00 per 1,000, 15% complete, live
- [Agent Data Tools, $20 pack](https://datacircle.dev/company-technology-apis/agent-data-tools/20-pack/llms.txt): $9.091 per 1,000, 15% complete, live
- [Agent Data Tools, $100 pack](https://datacircle.dev/company-technology-apis/agent-data-tools/100-pack/llms.txt): $8.00 per 1,000, 15% complete, live

## Agent Data Tools's calls for this API (1)

- `GET /tech/stack`: [Agent Data Tools, free](https://datacircle.dev/company-technology-apis/agent-data-tools/free/llms.txt)

## Agent Data Tools's APIs (7)

- [Agent Data Tools: tech stack API pricing, 6 plans](https://datacircle.dev/company-technology-apis/agent-data-tools/free/llms.txt)
- [Agent Data Tools: domain WHOIS API pricing, 6 plans](https://datacircle.dev/domain-whois-apis/agent-data-tools/free/llms.txt)
- [Agent Data Tools: email verification API pricing, 6 plans](https://datacircle.dev/validate-email-apis/agent-data-tools/free/llms.txt)
- [Agent Data Tools: company enrichment API pricing, 6 plans, GET /company/lookup](https://datacircle.dev/company-enrichment-apis/agent-data-tools/free-calls-get-company-lookup/llms.txt)
- [Agent Data Tools: company enrichment API pricing, 6 plans, GET /pack/domain-intel](https://datacircle.dev/company-enrichment-apis/agent-data-tools/free-calls-get-pack-domain-intel/llms.txt)
- [Agent Data Tools: web scraping API pricing, 6 plans, GET /extract](https://datacircle.dev/web-scraping-apis/agent-data-tools/free-calls-get-extract/llms.txt)
- [Agent Data Tools: web scraping API pricing, 6 plans, GET /contents](https://datacircle.dev/web-scraping-apis/agent-data-tools/free-calls-get-contents/llms.txt)
- [Agent Data Tools: web scraping API pricing, 6 plans, GET /scrape](https://datacircle.dev/web-scraping-apis/agent-data-tools/free-calls-get-scrape/llms.txt)
- [Agent Data Tools: IP company lookup API pricing, 6 plans, GET /pack/ip-intelligence](https://datacircle.dev/ip-company-lookup-apis/agent-data-tools/free-calls-get-pack-ip-intelligence/llms.txt)
- [Agent Data Tools: IP company lookup API pricing, 6 plans, GET /ip/lookup](https://datacircle.dev/ip-company-lookup-apis/agent-data-tools/free-calls-get-ip-lookup/llms.txt)
- [Agent Data Tools: business verification API pricing, 6 plans, GET /lei/lookup](https://datacircle.dev/business-verification-apis/agent-data-tools/free-calls-get-lei-lookup/llms.txt)
- [Agent Data Tools: business verification API pricing, 6 plans, GET /vat/validate](https://datacircle.dev/business-verification-apis/agent-data-tools/free-calls-get-vat-validate/llms.txt)

## Agent Data Tools: tech stack API alternatives

- [SEO Score API, $39 monthly](https://datacircle.dev/company-technology-apis/seo-score-api/39-monthly/llms.txt): $7.80 per 1,000, 8% complete, live
- [RankParse, $59 monthly](https://datacircle.dev/company-technology-apis/rankparse/59-monthly/llms.txt): $7.867 per 1,000, 23% complete, live
- [agentsvc.io, $0.10 pack](https://datacircle.dev/company-technology-apis/agentsvc-io/0-10-pack/llms.txt): $8.182 per 1,000, 23% complete, live
- [ReefAPI, $15 monthly](https://datacircle.dev/company-technology-apis/reefapi/15-monthly/llms.txt): $9.00 per 1,000, 23% complete, live

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-09.

- https://agent-data-tools.revmesh2074.workers.dev/credits?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://agent-data-tools.revmesh2074.workers.dev/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://agent-data-tools.revmesh2074.workers.dev/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://agent-data-tools.revmesh2074.workers.dev/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://agent-data-tools.revmesh2074.workers.dev/tools?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing