# Semust, free: Related keywords API

> Manuel araştırma süreçlerinden ve karışık veri toplama işlerinden kurtulun. Semust Keyword Research API — arama hacmi, CPC, rekabet skoru, arama niyeti ve ilgili kelime önerilerini tek bir endpoint'te birleştiren SEO keyword API'si.

Semust's Free trial plan for the related keywords API costs $0.00 per 1,000 keywords. Semust's docs list 2 of the 6 fields on our checklist: Search volume, Competition.
We haven't run Semust through [our related keywords API benchmark](https://datacircle.dev/best-related-keywords-api.txt) yet.
This plan is free. We rank 226 plans for related keywords APIs by price. Half the plans cost $0.596 per 1,000 keywords or less. [See the best free related keywords API plan.](https://datacircle.dev/best-related-keywords-api.txt)
[Keys.so's ₽34,900 (about $417) monthly plan](https://datacircle.dev/related-keywords-apis/keys-so/34900-monthly/llms.txt) is the cheapest paid plan per 1,000 keywords. Keys.so's ₽34,900 (about $417) monthly plan charges nothing per call. You get as many keywords as Keys.so's rate limit allows.
[seodata.dev's $4.99 monthly plan](https://datacircle.dev/related-keywords-apis/seodata-dev/4-99-monthly/llms.txt) covers any number of keywords. seodata.dev's $4.99 monthly plan costs less up front than Keys.so's ₽34,900 (about $417) monthly plan.
[Bing Webmaster Tools](https://datacircle.dev/related-keywords-apis/bing-webmaster-tools/free/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 [Mangools](https://datacircle.dev/related-keywords-apis/mangools/15-monthly/llms.txt) are the best related keywords API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/related-keywords-apis/semust/free
- [Related keywords API: the 9 best providers compared](https://datacircle.dev/best-related-keywords-api.txt)
- Get it: https://semust.com/en/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- Request: `POST https://data.semust.com/v1/keyword-data`
- API key: with the plan, on https://semust.com/en/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- Its API docs: https://semust.com/en/docs/api/keyword-data?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- Sold by: Semust (https://semust.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing)
- Checked: 2026-11-07

## In the answer

- Completeness: 33%
- Search volume: ✓
- Competition: ✓

## Price

- $ per 1,000 keywords: $0.00
- Per: result
- Billing: free

## Charges

- Also pays for: from the same budget: SERP API · Google Images API · Technical SEO API · Backlinks API · Domain Research API · YouTube API · Trends API · On-Page API · Business Data API

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Manuel araştırma süreçlerinden ve karışık veri toplama işlerinden kurtulun. Semust Keyword Research API — arama hacmi, CPC, rekabet skoru, arama niyeti ve ilgili kelime önerilerini tek bir endpoint'te birleştiren SEO keyword API'si.

## Data

- Keep data: no API terms
- Use data: no API terms

## Plan

- Pay: $0
- Expires: 14 days

## Rate limit

- Batch: 1

## Speed

- Answer: in the call or by polling

## The call

- You send: keyword, match_type "related". Optional: country, language, limit
- Method: POST
- Path: /v1/keyword-data

## About the plan

- Plan: Free trial
- Who can get it: anyone who signs up, no credit card required

## The 12 fields the plan's answer can hold

keyword, search volume, CPC, competition, competition level, country, language, intent, related keywords, success, result count, cost

## Semust's plans (2)

- [Semust, free](https://datacircle.dev/related-keywords-apis/semust/free/llms.txt): $0.00 per 1,000, 33% complete
- [Semust, top-up](https://datacircle.dev/related-keywords-apis/semust/top-up/llms.txt): $0.30 per 1,000, 33% complete

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

- `POST /v1/keyword-data`: [Semust, free](https://datacircle.dev/related-keywords-apis/semust/free/llms.txt)

## Semust's APIs (11)

- [Semust: image search API pricing, 2 plans](https://datacircle.dev/image-search-apis/semust/free/llms.txt)
- [Semust: SERP API pricing, 2 plans](https://datacircle.dev/serp-apis/semust/free/llms.txt)
- [Semust: Local business reviews API pricing, 2 plans](https://datacircle.dev/local-business-reviews-apis/semust/free/llms.txt)
- [Semust: Local business search API pricing, 2 plans](https://datacircle.dev/local-business-search-apis/semust/free/llms.txt)
- [Semust: backlink API pricing, 2 plans](https://datacircle.dev/backlink-apis/semust/free/llms.txt)
- [Semust: domain authority API pricing, 2 plans](https://datacircle.dev/domain-authority-apis/semust/free/llms.txt)
- [Semust: keyword research API pricing, 2 plans](https://datacircle.dev/keyword-research-apis/semust/free/llms.txt)
- [Semust: ranked keywords API pricing, 2 plans](https://datacircle.dev/ranked-keywords-apis/semust/free/llms.txt)
- [Semust: related keywords API pricing, 2 plans](https://datacircle.dev/related-keywords-apis/semust/free/llms.txt)
- [Semust: web scraping API pricing, 2 plans](https://datacircle.dev/web-scraping-apis/semust/free/llms.txt)
- [Semust: video search API pricing, 2 plans](https://datacircle.dev/video-search-apis/semust/free/llms.txt)

## Semust: related keywords API alternatives

- [YepAPI, top-up, Pay as you go, POST /v1/seo/keywords/ideas](https://datacircle.dev/related-keywords-apis/yepapi/top-up-pay-as-you-go-post-v1-seo-keywords-ideas/llms.txt): $0.30 per 1,000, 100% complete, stored
- [Citable, pay as you go, Pay per call, GET /v1/keyword-research](https://datacircle.dev/related-keywords-apis/citable/pay-as-you-go-pay-per-call-get-v1-keyword-research/llms.txt): $0.30 per 1,000, 83% complete
- [Ahrefs, $249 monthly, Standard, GET /v3/keywords-explorer/matching-terms, Matching terms](https://datacircle.dev/related-keywords-apis/ahrefs/249-monthly-standard-get-v3-keywords-explorer-matching-terms-matching-terms/llms.txt): $0.311 per 1,000, 50% complete
- [Keywords Everywhere, $8,000 pack, 50,000,000 credits, POST /v1/get_pasf_keywords](https://datacircle.dev/related-keywords-apis/keywords-everywhere/8000-pack-50000000-credits-post-v1-get-pasf-keywords/llms.txt): $0.32 per 1,000, 0% complete

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-07.

- https://semust.com/api-platform/keyword-research-api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://semust.com/en/docs/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://semust.com/en/docs/api/keyword-data?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://semust.com/en/docs/api/rate-limits?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://semust.com/en/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://semust.com/en/terms-of-service?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing