# kwrds.ai, free: Related keywords API

> The Related Keywords API allows you to retrieve a list of keywords related to a given keyword, along with their search volumes, CPC, search intent, and competition level.

kwrds.ai's related keywords API on its Free API Plan. It costs $0.00 per 1,000 keywords. It returns 4 of the 6 key fields we check: Search volume, Cost per click, Competition, Search intent.
We rank 66 plans by price. [Mangools's $15 monthly plan](https://datacircle.dev/related-keywords-apis/mangools/15-monthly/llms.txt) is the cheapest paid plan per 1,000 keywords: $0.0001. Mangools charges for each page of results. We count 10,000 keywords on each page to get the $0.0001 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 [SE Ranking](https://datacircle.dev/related-keywords-apis/se-ranking/29-monthly-add-on-monthly-billing-get-v1-keywords-similar/llms.txt) are the best related keywords API providers in our benchmark.

- This page: https://datacircle.dev/related-keywords-apis/kwrds-ai/free
- [Best related keywords API in 2026: pricing compared](https://datacircle.dev/best-related-keywords-api.txt)
- Get it: https://www.kwrds.ai/api
- Request: `POST https://keywordresearch.api.kwrds.ai/related-keywords`
- API key: with the plan, on https://www.kwrds.ai/api
- Its API docs: https://www.kwrds.ai/api/documentation/related-keywords
- Sold by: kwrds.ai (https://www.kwrds.ai)
- Checked: 2026-10-30

## In the answer

- Completeness: 67%
- Search volume: ✓
- Cost per click: ✓
- Competition: ✓
- Search intent: ✓

## Price

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

## Charges

- Also pays for: nothing else

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: The Related Keywords API allows you to retrieve a list of keywords related to a given keyword, along with their search volumes, CPC, search intent, and competition level.

## Data

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

## Plan

- Pay: $0
- You get: 1 request
- Enough for: 1 page

## Rate limit

- Batch: 1

## The call

- You send: search_question, search_country, Content-Type header "application/json". Optional: limit
- Method: POST
- Path: /related-keywords

## About the plan

- Plan: Free API Plan
- Who can get it: anyone with an account

## The 6 fields the plan's answer can hold

keyword, search volume, cost per click, search intent, competition, keyword source

## kwrds.ai's plans (4)

- [kwrds.ai, free](https://datacircle.dev/related-keywords-apis/kwrds-ai/free/llms.txt): $0.00 per 1,000, 67% complete, live
- [kwrds.ai, $49 monthly](https://datacircle.dev/related-keywords-apis/kwrds-ai/49-monthly/llms.txt): 67% complete, live
- [kwrds.ai, $99 monthly](https://datacircle.dev/related-keywords-apis/kwrds-ai/99-monthly/llms.txt): 67% complete, live
- [kwrds.ai, contact us](https://datacircle.dev/related-keywords-apis/kwrds-ai/contact-us/llms.txt): 67% complete, live

## kwrds.ai's calls for this API (1)

- `POST /related-keywords`: [kwrds.ai, free](https://datacircle.dev/related-keywords-apis/kwrds-ai/free/llms.txt)

## kwrds.ai's APIs (4)

- [kwrds.ai: related keywords API pricing, 4 plans](https://datacircle.dev/related-keywords-apis/kwrds-ai/free/llms.txt)
- [kwrds.ai: SERP API pricing, 4 plans](https://datacircle.dev/serp-apis/kwrds-ai/free/llms.txt)
- [kwrds.ai: ranked keywords API pricing, 4 plans](https://datacircle.dev/ranked-keywords-apis/kwrds-ai/free/llms.txt)
- [kwrds.ai: keyword research API pricing, 4 plans, POST /keywords-with-volumes](https://datacircle.dev/keyword-research-apis/kwrds-ai/free-api-plan-post-keywords-with-volumes/llms.txt)
- [kwrds.ai: keyword research API pricing, 4 plans, POST /search-volume](https://datacircle.dev/keyword-research-apis/kwrds-ai/free-api-plan-post-search-volume/llms.txt)

## kwrds.ai: related keywords API alternatives

- [DataForSEO, free, $1 trial credit, POST /v3/keywords_data/bing/keywords_for_keywords/live](https://datacircle.dev/related-keywords-apis/dataforseo/free-1-trial-credit-post-v3-keywords-data-bing-keywords-for-keywords-live/llms.txt): $0.00 per 1,000, 67% 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 2026-10-30.

- https://www.kwrds.ai/api
- https://www.kwrds.ai/api/documentation
- https://www.kwrds.ai/api/documentation/related-keywords
- https://www.kwrds.ai/terms