# KeywordPlanner.vn, $9 monthly: Related keywords API

> Keyword ideas for seed keywords and/or a website, with volume, 12-month trend, CPC, competition and difficulty (max 1000 rows).

KeywordPlanner.vn's Starter plan for the related keywords API costs $0.0018 per 1,000 keywords. KeywordPlanner.vn's docs list 4 of the 6 fields on our checklist: Search volume, Monthly trend, Competition, Keyword difficulty.
We haven't run KeywordPlanner.vn through [our related keywords API benchmark](https://datacircle.dev/best-related-keywords-api.txt) yet.
Half of the 226 plans we rank by price cost $0.596 per 1,000 keywords or less. This plan costs less per 1,000 keywords than 92% of the 226 plans.
[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/keywordplanner-vn/9-monthly
- [Related keywords API: the 9 best providers compared](https://datacircle.dev/best-related-keywords-api.txt)
- Get it: https://keywordplanner.vn/en/price?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- Request: `POST https://keywordplanner.vn/api/v1/keywords/ideas`
- API key: with the plan, on https://keywordplanner.vn/en/price?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- Its API docs: https://keywordplanner.vn/en/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing#endpoints
- Sold by: KeywordPlanner.vn (https://keywordplanner.vn?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing)
- Checked: 2026-11-07

## In the answer

- Completeness: 67%
- Search volume: ✓
- Monthly trend: ✓
- Competition: ✓
- Keyword difficulty: ✓

## Price

- $ per 1,000 keywords: $0.0018
- Per: page of 1,000
- Billing: monthly
- $ a month: $9

## Charges

- Also pays for: from the same budget: /api/v1/keywords/volume call · /api/v1/keywords/suggest call · /api/v1/keywords/group call · /api/v1/keywords/semantic call

## Overage

- Units cap: hard

## In their words

- Their pitch: Keyword ideas for seed keywords and/or a website, with volume, 12-month trend, CPC, competition and difficulty (max 1000 rows).

## Data

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

## Plan

- Pay: $9
- You get: 10,000 credits a month
- Enough for: 5,000 pages a month
- Expires: at the monthly reset

## Rate limit

- Per day: 500
- Per second: 0.25
- Concurrent: 5

## Speed

- Answer: in the call

## The call

- You send: at least one of keywords or targetSite. Optional: country, lang, sortBy, limit
- Method: POST
- Path: /api/v1/keywords/ideas

## About the plan

- Plan: Starter
- Who can get it: anyone

## The 20 fields the plan's answer can hold

keyword, search volume, search volume trend, competition level, minimum cost per click, maximum cost per click, keyword difficulty, keyword length, is question, keyword type, traffic time, traffic month, traffic year, total impressions, success, plan, credits consumed, credits used, credits limit, credits remaining

## KeywordPlanner.vn's plans (4)

- [KeywordPlanner.vn, $9 monthly](https://datacircle.dev/related-keywords-apis/keywordplanner-vn/9-monthly/llms.txt): $0.0018 per 1,000, 67% complete
- [KeywordPlanner.vn, $19 monthly](https://datacircle.dev/related-keywords-apis/keywordplanner-vn/19-monthly/llms.txt): $0.0015 per 1,000, 67% complete
- [KeywordPlanner.vn, $75.60 yearly](https://datacircle.dev/related-keywords-apis/keywordplanner-vn/75-60-yearly/llms.txt): $0.0013 per 1,000, 67% complete
- [KeywordPlanner.vn, $159.60 yearly](https://datacircle.dev/related-keywords-apis/keywordplanner-vn/159-60-yearly/llms.txt): $0.0011 per 1,000, 67% complete

## KeywordPlanner.vn's calls for this API (1)

- `POST /api/v1/keywords/ideas`: [KeywordPlanner.vn, $9 monthly](https://datacircle.dev/related-keywords-apis/keywordplanner-vn/9-monthly/llms.txt)

## KeywordPlanner.vn's APIs (3)

- [KeywordPlanner.vn: search autocomplete API pricing, 4 plans, Keyword suggestions (Amazon)](https://datacircle.dev/search-autocomplete-apis/keywordplanner-vn/9-monthly-starter-get-api-v1-keywords-suggest-keyword-suggestions-amazon/llms.txt)
- [KeywordPlanner.vn: search autocomplete API pricing, 4 plans, Keyword suggestions (Bing)](https://datacircle.dev/search-autocomplete-apis/keywordplanner-vn/9-monthly-starter-get-api-v1-keywords-suggest-keyword-suggestions-bing/llms.txt)
- [KeywordPlanner.vn: search autocomplete API pricing, 4 plans, Keyword suggestions (Google)](https://datacircle.dev/search-autocomplete-apis/keywordplanner-vn/9-monthly-starter-get-api-v1-keywords-suggest-keyword-suggestions-google/llms.txt)
- [KeywordPlanner.vn: search autocomplete API pricing, 4 plans, Keyword suggestions (Wikipedia)](https://datacircle.dev/search-autocomplete-apis/keywordplanner-vn/9-monthly-starter-get-api-v1-keywords-suggest-keyword-suggestions-wikipedia/llms.txt)
- [KeywordPlanner.vn: search autocomplete API pricing, 4 plans, Keyword suggestions (Yahoo)](https://datacircle.dev/search-autocomplete-apis/keywordplanner-vn/9-monthly-starter-get-api-v1-keywords-suggest-keyword-suggestions-yahoo/llms.txt)
- [KeywordPlanner.vn: search autocomplete API pricing, 4 plans, Keyword suggestions (Yandex)](https://datacircle.dev/search-autocomplete-apis/keywordplanner-vn/9-monthly-starter-get-api-v1-keywords-suggest-keyword-suggestions-yandex/llms.txt)
- [KeywordPlanner.vn: search autocomplete API pricing, 4 plans, Keyword suggestions (YouTube)](https://datacircle.dev/search-autocomplete-apis/keywordplanner-vn/9-monthly-starter-get-api-v1-keywords-suggest-keyword-suggestions-youtube/llms.txt)
- [KeywordPlanner.vn: keyword research API pricing, 4 plans](https://datacircle.dev/keyword-research-apis/keywordplanner-vn/9-monthly/llms.txt)
- [KeywordPlanner.vn: related keywords API pricing, 4 plans](https://datacircle.dev/related-keywords-apis/keywordplanner-vn/9-monthly/llms.txt)

## KeywordPlanner.vn: related keywords API alternatives

- [SEOmonitor, €299 monthly](https://datacircle.dev/related-keywords-apis/seomonitor/299-monthly/llms.txt): $0.0011 per 1,000, 33% complete, 30 days
- [Mutagen, top-up, Wordstat parser, POST /json/{api_key}/mutagen.parser.get/, mutagen.parser.get wordstat_key_50](https://datacircle.dev/related-keywords-apis/mutagen/top-up-wordstat-parser-post-json-api-key-mutagen-parser-get-mutagen-parser-get-wordstat-key-50/llms.txt): $0.0012 per 1,000, 17% complete
- [Mangools, $586.20 yearly](https://datacircle.dev/related-keywords-apis/mangools/586-20-yearly/llms.txt): $0.0019 per 1,000, 83% complete
- [RankParse, $108 yearly](https://datacircle.dev/related-keywords-apis/rankparse/108-yearly/llms.txt): $0.003 per 1,000, 50% 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://keywordplanner.vn/en/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://keywordplanner.vn/en/disclaimer?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://keywordplanner.vn/en/price?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://keywordplanner.vn/en/privacy-policy?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing