# Arvow, $69 monthly, Solo, POST /api/v0.1/projects/{projectId}/seo/keywords/suggestions: Related keywords API

> Returns long-tail keyword suggestions for one seed.

Arvow's Solo plan for the related keywords API costs $2.76 per 1,000 keywords. We check each provider's docs for 6 fields. Arvow's docs list 5: Search volume, Cost per click, Competition, Keyword difficulty, Search intent.
We haven't run Arvow through [our related keywords API benchmark](https://datacircle.dev/best-related-keywords-api.txt) yet.
We rank 253 plans for related keywords APIs by price. Half the plans cost $0.735 or less per 1,000 keywords. This plan costs less per 1,000 keywords than 31% of the 253 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, with no charge per call. You get as many keywords as Keys.so's rate limit allows. [AnyAPI's pay-as-you-go plan](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) costs the least for 10,000 keywords a month: $1.60.
[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, and costs less up front than Keys.so's ₽34,900 (about $417) monthly plan.
[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), [Mangools](https://datacircle.dev/related-keywords-apis/mangools/15-monthly/llms.txt) and [Bing Webmaster Tools](https://datacircle.dev/related-keywords-apis/bing-webmaster-tools/free/llms.txt) are the best related keywords API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/related-keywords-apis/arvow/69-monthly-solo-post-api-v0-1-projects-projectid-seo-keywords-suggestions
- [Related keywords API: the best SEO keyword data providers](https://datacircle.dev/best-related-keywords-api.txt)
- Get it: https://arvow.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- Request: `POST https://api.arvow.com/api/v0.1/projects/{projectId}/seo/keywords/suggestions`
- API key: with the plan, on https://arvow.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- Its API docs: https://api.arvow.com/api/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing#tag/seo-research/POST/api/v0.1/projects/{projectId}/seo/keywords/suggestions
- Sold by: Arvow (https://arvow.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing)
- Checked: 2026-11-10

## In the answer

- Completeness: 83%
- Search volume: ✓
- Cost per click: ✓
- Competition: ✓
- Keyword difficulty: ✓
- Search intent: ✓

## Price

- $ per 1,000 keywords: $2.76
- Per: page of 50
- Billing: monthly
- $ a month: $69

## Charges

- Also pays for: from the same budget: Generate a new batch of articles · Suggest internal links · Generate an AI image · Create a brand monitor · Update a brand monitor · Add monitor prompts · Run monitor prompts · Look up keyword metrics · Get related keywords · Get keyword ideas · List ranking keywords · Get domain overview · Get backlink overview · Get organic search results · List competing domains · Find keyword gaps

## Overage

- Units cap: hard

## In their words

- Their pitch: Returns long-tail keyword suggestions for one seed.

## Data

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

## Plan

- Pay: $69
- You get: 1,000 credits a month
- Enough for: 500 pages a month
- Expires: resets every billing cycle

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: projectId, keyword. Optional: limit, countryCode, languageCode
- Method: POST
- Path: /api/v0.1/projects/{projectId}/seo/keywords/suggestions

## About the plan

- Plan: Solo
- Who can get it: anyone who registers a member account with an accurate email address

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

seed keyword, country code, language code, keyword, search volume, cost per click, competition, keyword difficulty, search intent

## Arvow's plans (6)

- [Arvow, $69 monthly, Solo, POST /api/v0.1/projects/{projectId}/seo/keywords/suggestions](https://datacircle.dev/related-keywords-apis/arvow/69-monthly-solo-post-api-v0-1-projects-projectid-seo-keywords-suggestions/llms.txt): $2.76 per 1,000, 83% complete
- [Arvow, $169 monthly, Business, POST /api/v0.1/projects/{projectId}/seo/keywords/suggestions](https://datacircle.dev/related-keywords-apis/arvow/169-monthly-business-post-api-v0-1-projects-projectid-seo-keywords-suggestions/llms.txt): $2.253 per 1,000, 83% complete
- [Arvow, $449 monthly, Ultimate, POST /api/v0.1/projects/{projectId}/seo/keywords/suggestions](https://datacircle.dev/related-keywords-apis/arvow/449-monthly-ultimate-post-api-v0-1-projects-projectid-seo-keywords-suggestions/llms.txt): $1.996 per 1,000, 83% complete
- [Arvow, $468 yearly, Solo, POST /api/v0.1/projects/{projectId}/seo/keywords/suggestions](https://datacircle.dev/related-keywords-apis/arvow/468-yearly-solo-post-api-v0-1-projects-projectid-seo-keywords-suggestions/llms.txt): $1.56 per 1,000, 83% complete
- [Arvow, $828 yearly, Business, POST /api/v0.1/projects/{projectId}/seo/keywords/suggestions](https://datacircle.dev/related-keywords-apis/arvow/828-yearly-business-post-api-v0-1-projects-projectid-seo-keywords-suggestions/llms.txt): $0.92 per 1,000, 83% complete
- [Arvow, $2,988 yearly, Ultimate, POST /api/v0.1/projects/{projectId}/seo/keywords/suggestions](https://datacircle.dev/related-keywords-apis/arvow/2988-yearly-ultimate-post-api-v0-1-projects-projectid-seo-keywords-suggestions/llms.txt): $1.107 per 1,000, 83% complete

## Arvow's calls for this API (3)

- `POST /api/v0.1/projects/{projectId}/seo/keywords/ideas`: [Arvow, $69 monthly, Solo, POST /api/v0.1/projects/{projectId}/seo/keywords/ideas](https://datacircle.dev/related-keywords-apis/arvow/69-monthly-solo-post-api-v0-1-projects-projectid-seo-keywords-ideas/llms.txt)
- `POST /api/v0.1/projects/{projectId}/seo/keywords/suggestions`: [Arvow, $69 monthly, Solo, POST /api/v0.1/projects/{projectId}/seo/keywords/suggestions](https://datacircle.dev/related-keywords-apis/arvow/69-monthly-solo-post-api-v0-1-projects-projectid-seo-keywords-suggestions/llms.txt)
- `POST /api/v0.1/projects/{projectId}/seo/keywords/related`: [Arvow, $69 monthly, Solo, POST /api/v0.1/projects/{projectId}/seo/keywords/related](https://datacircle.dev/related-keywords-apis/arvow/69-monthly-solo-post-api-v0-1-projects-projectid-seo-keywords-related/llms.txt)

## Arvow's APIs (5)

- [Arvow Keyword research API pricing, 6 plans](https://datacircle.dev/keyword-research-apis/arvow/69-monthly/llms.txt)
- [Arvow Ranked keywords API pricing, 6 plans](https://datacircle.dev/ranked-keywords-apis/arvow/69-monthly/llms.txt)
- [Arvow SERP API pricing, 6 plans](https://datacircle.dev/serp-apis/arvow/69-monthly/llms.txt)
- [Arvow Domain authority API pricing, 6 plans, POST /api/v0.1/projects/{projectId}/seo/domains/backlinks](https://datacircle.dev/domain-authority-apis/arvow/69-monthly-solo-post-api-v0-1-projects-projectid-seo-domains-backlinks/llms.txt)
- [Arvow Domain authority API pricing, 6 plans, POST /api/v0.1/projects/{projectId}/seo/domains/overview](https://datacircle.dev/domain-authority-apis/arvow/69-monthly-solo-post-api-v0-1-projects-projectid-seo-domains-overview/llms.txt)
- [Arvow Related keywords API pricing, 6 plans, POST /api/v0.1/projects/{projectId}/seo/keywords/suggestions](https://datacircle.dev/related-keywords-apis/arvow/69-monthly-solo-post-api-v0-1-projects-projectid-seo-keywords-suggestions/llms.txt)

## Arvow: related keywords API alternatives

[Arvow alternatives: other related keywords API providers by price](https://datacircle.dev/arvow-alternatives.txt)

We list other providers' plans closest to this plan in price per 1,000 keywords.

- [Moz, $125 monthly](https://datacircle.dev/related-keywords-apis/moz/125-monthly/llms.txt): $2.50 per 1,000, 0% complete
- [SearcherLite, $7 pack, Starter, related_keywords](https://datacircle.dev/related-keywords-apis/searcherlite/7-pack-starter-related-keywords/llms.txt): $2.80 per 1,000, 67% complete
- [Ranxplorer, €2,500 pack, Sans abonnement 10 M, GET /v1/kwd/relatedsearches](https://datacircle.dev/related-keywords-apis/ranxplorer/2500-pack-sans-abonnement-10-m-get-v1-kwd-relatedsearches/llms.txt): $2.813 per 1,000, 83% complete
- [SpyFu, $119 monthly, Pro + AI, GET /apis/keyword_api/v2/related/getAlsoBuysAdsForKeywords](https://datacircle.dev/related-keywords-apis/spyfu/119-monthly-pro-ai-get-apis-keyword-api-v2-related-getalsobuysadsforkeywords/llms.txt): $2.975 per 1,000, 67% 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 2026-11-10.

- https://api.arvow.com/api/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://arvow.com/developers-and-ai-agents?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://arvow.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://arvow.com/tos?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing