# OutlierKit, $19 pack: Related keywords API

> Expand seed keywords into a ranked list of related YouTube search keywords with monthly search volumes.

OutlierKit's related keywords API on its Credit top-up plan. It costs $1.90 per 1,000 keywords. It returns 2 of the 6 key fields we check: Search volume, Competition.
We haven't run OutlierKit through [our related keywords API benchmark](https://datacircle.dev/best-related-keywords-api.txt) yet.
Half of the 169 plans we rank by price cost $0.45 per 1,000 keywords or less. This plan costs less per 1,000 keywords than 11% of the 169 plans.
[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.
[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 XMLRiver's ₽15,000 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/outlierkit/19-pack
- [Related keywords API: 6 providers compared on price and data](https://datacircle.dev/best-related-keywords-api.txt)
- Get it: https://outlierkit.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- Request: `POST https://outlierkit.com/api/v1/keywords/research`
- API key: with the plan, on https://outlierkit.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- Its API docs: https://outlierkit.com/app/api-docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- Sold by: OutlierKit (https://outlierkit.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing)
- Checked: 2026-11-05

## In the answer

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

## Price

- $ per 1,000 keywords: $1.90
- Per: page of 200
- Billing: pay first

## Charges

- Also pays for: from the same budget: Outlier video search · Deep Outlier Search · Outlier channel search · Channel similarity · Channel lookup · Video lookup · Channel videos · Video transcript · Video comments

## Overage

- Units cap: hard

## In their words

- Their pitch: Expand seed keywords into a ranked list of related YouTube search keywords with monthly search volumes.

## Data

- Freshness: live
- Keep data: no API terms
- Use data: You agree to: [...] Use the Service in compliance with all applicable laws and regulations, Respect platform-specific usage limitations and guidelines, Not use the Service for any illegal or unauthorized purpose, Not attempt to circumvent any technical limitations or access restrictions [...] You acknowledge that the use of such data is subject to the respective terms and privacy policies of these platforms.

## Plan

- Pay: $19
- You get: 100 credits
- Enough for: 50 pages

## Speed

- Answer: in the call

## The call

- You send: keywords, Content-Type header "application/json". Optional: minVolume, limit
- Method: POST
- Path: /keywords/research

## About the plan

- Plan: Credit top-up
- Who can get it: a subscriber of any plan

## The 11 fields the plan's answer can hold

success, credits consumed, credits remaining, request ID, time taken, keyword, search volume, competition, total results, results returned, fetched at

## OutlierKit's plans (7)

- [OutlierKit, $19 pack](https://datacircle.dev/related-keywords-apis/outlierkit/19-pack/llms.txt): $1.90 per 1,000, 33% complete, live
- [OutlierKit, $99 monthly](https://datacircle.dev/related-keywords-apis/outlierkit/99-monthly/llms.txt): $1.98 per 1,000, 33% complete, live
- [OutlierKit, $399 monthly](https://datacircle.dev/related-keywords-apis/outlierkit/399-monthly/llms.txt): $1.995 per 1,000, 33% complete, live
- [OutlierKit, $199 quarterly](https://datacircle.dev/related-keywords-apis/outlierkit/199-quarterly/llms.txt): $1.327 per 1,000, 33% complete, live
- [OutlierKit, $799 quarterly](https://datacircle.dev/related-keywords-apis/outlierkit/799-quarterly/llms.txt): $1.332 per 1,000, 33% complete, live
- [OutlierKit, $599 yearly](https://datacircle.dev/related-keywords-apis/outlierkit/599-yearly/llms.txt): $0.998 per 1,000, 33% complete, live
- [OutlierKit, $1,999 yearly](https://datacircle.dev/related-keywords-apis/outlierkit/1999-yearly/llms.txt): $0.833 per 1,000, 33% complete, live

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

- `POST /keywords/research`: [OutlierKit, $19 pack](https://datacircle.dev/related-keywords-apis/outlierkit/19-pack/llms.txt)

## OutlierKit's APIs (4)

- [OutlierKit: related keywords API pricing, 7 plans](https://datacircle.dev/related-keywords-apis/outlierkit/19-pack/llms.txt)
- [OutlierKit: YouTube channel API pricing, 7 plans](https://datacircle.dev/youtube-channel-apis/outlierkit/19-pack/llms.txt)
- [OutlierKit: YouTube channel video API pricing, 7 plans](https://datacircle.dev/youtube-channel-video-apis/outlierkit/19-pack/llms.txt)
- [OutlierKit: video search API pricing, 7 plans, POST /outliers/refresh](https://datacircle.dev/video-search-apis/outlierkit/19-pack-credit-top-up-post-outliers-refresh/llms.txt)
- [OutlierKit: video search API pricing, 7 plans, POST /outliers/search](https://datacircle.dev/video-search-apis/outlierkit/19-pack-credit-top-up-post-outliers-search/llms.txt)

## OutlierKit: related keywords API alternatives

- [Omkar Cloud, free](https://datacircle.dev/related-keywords-apis/omkar-cloud/free/llms.txt): $0.00 per 1,000, 67% complete, live
- [Answer Socrates, free, GET /api/v1/youtube-keywords](https://datacircle.dev/related-keywords-apis/answer-socrates/free-get-api-v1-youtube-keywords/llms.txt): $0.00 per 1,000, 0% complete, live
- [DataForSEO, top-up from $50, Pay as you go, POST /v3/keywords_data/bing/keywords_for_keywords/live](https://datacircle.dev/related-keywords-apis/dataforseo/top-up-from-50-pay-as-you-go-post-v3-keywords-data-bing-keywords-for-keywords-live/llms.txt): $0.03 per 1,000, 67% complete, live
- [QuanticData, $79 monthly](https://datacircle.dev/related-keywords-apis/quanticdata/79-monthly/llms.txt): $0.253 per 1,000, 0% 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 2026-11-05.

- https://outlierkit.com/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://outlierkit.com/app/api-docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://outlierkit.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://outlierkit.com/resources/choose-your-plan?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://outlierkit.com/resources/youtube-api-pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://outlierkit.com/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing