# Argosor, free: Related keywords API

> Expand a seed keyword or product category into semantic topic clusters with monthly search volume, CPC benchmarks, and Keyword Difficulty scores.

Argosor's related keywords API on its Free plan. It costs $0.00 per 1,000 keywords. Argosor's docs list 2 of the 6 key fields we check: Search volume, Search intent.
We haven't run Argosor through [our related keywords API benchmark](https://datacircle.dev/best-related-keywords-api.txt) yet.
This plan is free. We rank 194 plans for related keywords APIs by price. Half the plans cost $0.60 per 1,000 keywords or less.
[Keys.so's ₽34,900 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 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 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/argosor/free
- [Related keywords API: the 7 best providers compared](https://datacircle.dev/best-related-keywords-api.txt)
- Get it: https://argosor.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- Request: `POST https://argosor.com/v1/keywords/cluster`
- API key: with the plan, on https://argosor.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- Its API docs: https://argosor.com/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing#rest
- Sold by: Argosor (https://argosor.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: ✓
- Search intent: ✓

## Price

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

## Charges

- Also pays for: AI visibility audit across nine models · 7-dimension reputation score + answer-first writer pack · from the same budget: Live Multi-Engine SERP & AI Overview Search · Backlink Authority & LLM Citation Graph · Live Web URL to Clean LLM Markdown Extractor

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Expand a seed keyword or product category into semantic topic clusters with monthly search volume, CPC benchmarks, and Keyword Difficulty scores.

## Data

- Keep data: no limit
- Use data: By using Argosor you agree to use it lawfully, to respect the terms of the search engines, AI providers and websites you query, and to keep your API keys secure.

## Plan

- Pay: $0
- You get: 250 requests a month
- Enough for: 250 pages a month

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: seed_topic. Optional: country, language, max_clusters
- Method: POST
- Path: /v1/keywords/cluster

## About the plan

- Plan: Free
- Who can get it: anyone

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

keyword, cluster, search volume, CPC, difficulty, search intent, funnel stage, conversational prompts, recommended URL slug

## Argosor's plans (7)

- [Argosor, free](https://datacircle.dev/related-keywords-apis/argosor/free/llms.txt): $0.00 per 1,000, 33% complete
- [Argosor, $19 monthly](https://datacircle.dev/related-keywords-apis/argosor/19-monthly/llms.txt): 33% complete
- [Argosor, $39 monthly](https://datacircle.dev/related-keywords-apis/argosor/39-monthly/llms.txt): 33% complete
- [Argosor, $79 monthly](https://datacircle.dev/related-keywords-apis/argosor/79-monthly/llms.txt): 33% complete
- [Argosor, $190 yearly](https://datacircle.dev/related-keywords-apis/argosor/190-yearly/llms.txt): 33% complete
- [Argosor, $390 yearly](https://datacircle.dev/related-keywords-apis/argosor/390-yearly/llms.txt): 33% complete
- [Argosor, $790 yearly](https://datacircle.dev/related-keywords-apis/argosor/790-yearly/llms.txt): 33% complete

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

- `POST /v1/keywords/cluster`: [Argosor, free](https://datacircle.dev/related-keywords-apis/argosor/free/llms.txt)

## Argosor's APIs (3)

- [Argosor: domain authority API pricing, 7 plans](https://datacircle.dev/domain-authority-apis/argosor/free/llms.txt)
- [Argosor: related keywords API pricing, 7 plans](https://datacircle.dev/related-keywords-apis/argosor/free/llms.txt)
- [Argosor: SERP API pricing, 7 plans](https://datacircle.dev/serp-apis/argosor/free/llms.txt)

## Argosor: related keywords API alternatives

- [Bing Webmaster Tools, free](https://datacircle.dev/related-keywords-apis/bing-webmaster-tools/free/llms.txt): $0.00 per 1,000, 17% complete
- [DataForSEO, free, $1 trial credit, POST /v3/dataforseo_labs/google/keyword_ideas/live](https://datacircle.dev/related-keywords-apis/dataforseo/free-1-trial-credit-post-v3-dataforseo-labs-google-keyword-ideas-live/llms.txt): $0.00 per 1,000, 100% complete, 1 month
- [Mangools, free](https://datacircle.dev/related-keywords-apis/mangools/free/llms.txt): $0.00 per 1,000, 83% complete
- [SE Ranking, free trial, GET /v1/keywords/questions](https://datacircle.dev/related-keywords-apis/se-ranking/free-trial-get-v1-keywords-questions/llms.txt): $0.00 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 2026-11-05.

- https://argosor.com/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://argosor.com/docs.md?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://argosor.com/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://argosor.com/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://argosor.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://argosor.com/pricing.md?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://argosor.com/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://argosor.com/vs/serpapi?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing