# LucidExtractor, free: Related keywords API

> Analyze search engine results pages for any keyword with metrics, rankings, and related keywords.

LucidExtractor's related keywords API on its Free plan. It costs $0.00 per 1,000 keywords. It returns 1 of the 6 key fields we check: Search volume.
We rank 82 plans by price. [XMLRiver's ₽15,000 monthly plan](https://datacircle.dev/related-keywords-apis/xmlriver/15000-monthly/llms.txt) is the cheapest paid plan per 1,000 keywords: $0.00009. XMLRiver charges for each page of results. We count 2,000 keywords on each page to get the $0.00009 price.
[Mangools](https://datacircle.dev/related-keywords-apis/mangools/15-monthly/llms.txt), [DataForSEO](https://datacircle.dev/related-keywords-apis/dataforseo/top-up-from-50-pay-as-you-go-post-v3-dataforseo-labs-google-keyword-ideas-live/llms.txt) and [AnyAPI](https://datacircle.dev/related-keywords-apis/anyapi/top-up-from-10-manual-top-up-post-v1-run-seo-related-keywords/llms.txt) are the best related keywords API providers in our benchmark.

- This page: https://datacircle.dev/related-keywords-apis/lucidextractor/free
- [Best related keywords API in 2026: providers compared](https://datacircle.dev/best-related-keywords-api.txt)
- Get it: https://lucidextractor.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- Request: `POST https://api.lucidextractor.com/v1/serp/analyze`
- API key: with the plan, on https://lucidextractor.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- Its API docs: https://lucidextractor.com/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing#serp-analysis
- Sold by: LucidExtractor (https://lucidextractor.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing)
- Checked: 2026-11-01

## In the answer

- Completeness: 17%
- Search volume: ✓

## Price

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

## Charges

- Also pays for: from the same budget: Single URL scraping · Bulk URL scraping · Browser session reuse · Website crawling · AI data extraction · SEO analysis · Advanced SEO audit · Trending Keywords · Create Monitor · Create Schedule

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Analyze search engine results pages for any keyword with metrics, rankings, and related keywords.

## Data

- Keep data: no limit
- Use data: Subject to these Terms, we grant you a limited, non-exclusive, non-transferable, revocable license to access and use the Service for your personal or internal business purposes. [...] You agree to use the Service only for lawful purposes and in accordance with these Terms. [...] Your Responsibilities: Ensure you have the legal right to scrape target websites, Comply with target websites' robots.txt and terms of service, Do not overwhelm or damage target websites with excessive requests, Respect intellectual property and copyright laws, Protect your API keys and account credentials. [...] The following activities are strictly prohibited: Scraping personal data without proper legal basis (GDPR, CCPA compliance), Harvesting email addresses or contact information for spam, Circumventing security measures of websites that prohibit scraping, Engaging in competitive intelligence gathering that violates laws, Distributing malware or conducting cyber attacks, Reselling, sublicensing, or redistributing the Service without authorization, Reverse engineering, decompiling, or attempting to extract source code, Creating multiple accounts to abuse free credit offerings, Using the Service for any illegal, fraudulent, or harmful purpose

## Plan

- Pay: $0
- You get: 500 credits a month
- Enough for: about 166 pages a month

## Rate limit

- Concurrent: 2
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: keyword. Optional: location, language
- Method: POST
- Path: /v1/serp/analyze

## About the plan

- Plan: Free
- Who can get it: anyone 18 or over

## The 2 fields the plan's answer can hold

keyword, search volume

## LucidExtractor's plans (10)

- [LucidExtractor, free](https://datacircle.dev/related-keywords-apis/lucidextractor/free/llms.txt): $0.00 per 1,000, 17% complete
- [LucidExtractor, $5 pack](https://datacircle.dev/related-keywords-apis/lucidextractor/5-pack/llms.txt): 17% complete
- [LucidExtractor, $20 pack](https://datacircle.dev/related-keywords-apis/lucidextractor/20-pack/llms.txt): 17% complete
- [LucidExtractor, $75 pack](https://datacircle.dev/related-keywords-apis/lucidextractor/75-pack/llms.txt): 17% complete
- [LucidExtractor, $240 pack](https://datacircle.dev/related-keywords-apis/lucidextractor/240-pack/llms.txt): 17% complete
- [LucidExtractor, $900 pack](https://datacircle.dev/related-keywords-apis/lucidextractor/900-pack/llms.txt): 17% complete
- [LucidExtractor, $12 monthly](https://datacircle.dev/related-keywords-apis/lucidextractor/12-monthly/llms.txt): 17% complete
- [LucidExtractor, $45 monthly](https://datacircle.dev/related-keywords-apis/lucidextractor/45-monthly/llms.txt): 17% complete
- [LucidExtractor, $149 monthly](https://datacircle.dev/related-keywords-apis/lucidextractor/149-monthly/llms.txt): 17% complete
- [LucidExtractor, contact us](https://datacircle.dev/related-keywords-apis/lucidextractor/contact-us/llms.txt): 17% complete

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

- `POST /v1/serp/analyze`: [LucidExtractor, free](https://datacircle.dev/related-keywords-apis/lucidextractor/free/llms.txt)

## LucidExtractor's APIs (3)

- [LucidExtractor: keyword research API pricing, 10 plans](https://datacircle.dev/keyword-research-apis/lucidextractor/free/llms.txt)
- [LucidExtractor: related keywords API pricing, 10 plans](https://datacircle.dev/related-keywords-apis/lucidextractor/free/llms.txt)
- [LucidExtractor: web scraping API pricing, 10 plans, POST /v1/browser/batch](https://datacircle.dev/web-scraping-apis/lucidextractor/free-post-v1-browser-batch/llms.txt)
- [LucidExtractor: web scraping API pricing, 10 plans, POST /v1/scrape/batch](https://datacircle.dev/web-scraping-apis/lucidextractor/free-post-v1-scrape-batch/llms.txt)
- [LucidExtractor: web scraping API pricing, 10 plans, POST /v1/scrape/scrape](https://datacircle.dev/web-scraping-apis/lucidextractor/free-post-v1-scrape-scrape/llms.txt)

## LucidExtractor: related keywords API alternatives

- [Mangools, free](https://datacircle.dev/related-keywords-apis/mangools/free/llms.txt): $0.00 per 1,000, 83% complete
- [DataForSEO, free, $1 trial credit, POST /v3/dataforseo_labs/google/keyword_ideas/live](https://datacircle.dev/related-keywords-apis/dataforseo/free-1-trial-credit-post-v3-dataforseo-labs-google-keyword-ideas-live/llms.txt): $0.00 per 1,000, 100% complete, 1 month
- [AnyAPI, free trial key, POST /v1/run/seo.related_keywords](https://datacircle.dev/related-keywords-apis/anyapi/free-trial-key-post-v1-run-seo-related-keywords/llms.txt): $0.00 per 1,000, 100% complete, 1 month
- [SE Ranking, free trial, GET /v1/keywords/questions](https://datacircle.dev/related-keywords-apis/se-ranking/free-trial-get-v1-keywords-questions/llms.txt): $0.00 per 1,000, 100% complete, 1 month

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-01.

- https://lucidextractor.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://lucidextractor.com/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://lucidextractor.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://lucidextractor.com/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing