# RankParse, free: Related keywords API

> Discovers new keyword ideas from seed keywords, a URL, or both, each with average monthly searches, competition and top-of-page bid range.

RankParse's related keywords API on its Free plan. It costs $0.00 per 1,000 keywords. It returns 3 of the 6 key fields we check: Search volume, Cost per click, Competition.
You get 100 credits, which pay for RankParse's other calls. This call costs none of them for up to 3,000 calls a month.
We rank 53 plans by price. [Mangools's $15 monthly plan](https://datacircle.dev/related-keywords-apis/mangools/15-monthly/llms.txt) costs the least 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/rankparse/free
- [Best related keywords API in 2026](https://datacircle.dev/best-related-keywords-api.txt)
- Get it: https://rankparse.com/pricing
- Request: `POST https://api.rankparse.com/v1/google-ads/keyword-ideas`
- API key: with the plan, on https://rankparse.com/pricing
- Its API docs: https://rankparse.com/docs/endpoints/google-ads#post-v1google-adskeyword-ideas
- Sold by: RankParse (https://rankparse.com)
- Checked: 2026-10-29

## In the answer

- Completeness: 50%
- Search volume: ✓
- Cost per click: ✓
- Competition: ✓

## Price

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

## Charges

- Also pays for: from the same budget: POST /v1/google-ads/keyword-metrics · GET /v1/google-ads/accounts

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Discovers new keyword ideas from seed keywords, a URL, or both, each with average monthly searches, competition and top-of-page bid range.

## Data

- Keep data: no limit
- Use data: You may use RankParse data to build products, conduct research, enrich datasets, and power automated workflows. You may not: resell raw API responses as a standalone data product, use the API to build a service that directly competes with RankParse's API offering, attempt to circumvent rate limits, or use the service for any unlawful purpose.

## Plan

- Pay: $0
- You get: 100 credits
- Enough for: 3,000 calls a month

## Rate limit

- Per day: 100
- Per second: 1
- Batch: 1

## The call

- You send: one of keywords or url, Content-Type header "application/json". Optional: language, geo_target_constants, keyword_plan_network, include_adult_keywords, limit
- Method: POST
- Path: /v1/google-ads/keyword-ideas

## About the plan

- Plan: Free
- Who can get it: anyone with a valid email address and a Google Ads account connected to RankParse

## The 9 fields the plan's answer can hold

keyword, search volume, competition, competition index, low top of page bid, high top of page bid, results returned, total results, customer ID

## RankParse's plans (5)

- [RankParse, free](https://datacircle.dev/related-keywords-apis/rankparse/free/llms.txt): $0.00 per 1,000, 50% complete
- [RankParse, $15 monthly](https://datacircle.dev/related-keywords-apis/rankparse/15-monthly/llms.txt): $0.005 per 1,000, 50% complete
- [RankParse, $59 monthly](https://datacircle.dev/related-keywords-apis/rankparse/59-monthly/llms.txt): $0.02 per 1,000, 50% complete
- [RankParse, $108 yearly](https://datacircle.dev/related-keywords-apis/rankparse/108-yearly/llms.txt): $0.003 per 1,000, 50% complete
- [RankParse, $468 yearly](https://datacircle.dev/related-keywords-apis/rankparse/468-yearly/llms.txt): $0.013 per 1,000, 50% complete

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

- `POST /v1/google-ads/keyword-ideas`: [RankParse, free](https://datacircle.dev/related-keywords-apis/rankparse/free/llms.txt)

## RankParse's APIs (5)

- [RankParse: keyword research API pricing, 5 plans](https://datacircle.dev/keyword-research-apis/rankparse/free/llms.txt)
- [RankParse: related keywords API pricing, 5 plans](https://datacircle.dev/related-keywords-apis/rankparse/free/llms.txt)
- [RankParse: tech stack API pricing, 11 plans](https://datacircle.dev/company-technology-apis/rankparse/free/llms.txt)
- [RankParse: backlink API pricing, 11 plans, GET /v1/backlinks](https://datacircle.dev/backlink-apis/rankparse/free-get-v1-backlinks/llms.txt)
- [RankParse: backlink API pricing, 11 plans, POST /v1/batch](https://datacircle.dev/backlink-apis/rankparse/free-post-v1-batch/llms.txt)
- [RankParse: domain authority API pricing, 11 plans, GET /v1/domain-authority](https://datacircle.dev/domain-authority-apis/rankparse/free/llms.txt)
- [RankParse: domain authority API pricing, 11 plans, GET /v1/domain-rank](https://datacircle.dev/domain-authority-apis/rankparse/free-get-v1-domain-rank/llms.txt)

## RankParse: related keywords API alternatives

- [Mangools, $70.50 monthly](https://datacircle.dev/related-keywords-apis/mangools/70-50-monthly/llms.txt): $0.0028 per 1,000, 83% complete
- [DataForSEO, top-up from $50, Pay as you go, POST /v3/keywords_data/google_ads/keywords_for_keywords/live](https://datacircle.dev/related-keywords-apis/dataforseo/top-up-from-50-pay-as-you-go-post-v3-keywords-data-google-ads-keywords-for-keywords-live/llms.txt): $0.0045 per 1,000, 67% complete, live
- [KeywordTool.io, $816 yearly, Starter (annual), GET /v2/search/suggestions/bing](https://datacircle.dev/related-keywords-apis/keywordtool-io/816-yearly-starter-annual-get-v2-search-suggestions-bing/llms.txt): $0.045 per 1,000, 67% complete
- [AnyAPI, pay as you go, Pay per call with x402 and MPP, POST /v1/run/seo.related_keywords](https://datacircle.dev/related-keywords-apis/anyapi/pay-as-you-go-pay-per-call-with-x402-and-mpp-post-v1-run-seo-related-keywords/llms.txt): $0.16 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 2026-10-29.

- https://rankparse.com
- https://rankparse.com/docs/credits
- https://rankparse.com/docs/endpoints/google-ads
- https://rankparse.com/docs/rate-limiting
- https://rankparse.com/pricing
- https://rankparse.com/terms