# Gapup, pay as you go: Keyword research API

> SEO keyword research from a seed keyword or topic. Uses Google Suggest (public, keyless) to discover related queries at 2 expansion levels, then clusters them by intent.

Gapup's x402 plan for the keyword research API costs $50.00 per 1,000 keywords. We check each provider's docs for 6 fields. Gapup's docs list 1: Search volume.
We haven't run Gapup through [our keyword research API benchmark](https://datacircle.dev/best-keyword-research-api.txt) yet.
We rank 331 plans for keyword research APIs by price. Half the plans cost $2.388 or less per 1,000 keywords. This plan costs less per 1,000 keywords than 15% of the 331 plans.
[AppDrift's $14.99 monthly plan](https://datacircle.dev/keyword-research-apis/appdrift/14-99-monthly/llms.txt) costs the least per 1,000 keywords. AppDrift's keyword research API costs nothing beyond the plan price. [Pixel Tools's ₽99 pack](https://datacircle.dev/keyword-research-apis/pixel-tools/99-pack-guru-for-99-rubles-post-api-wordstatapi-wordstatapi/llms.txt) costs the least for 10,000 keywords a month: about $1.18.
[seodata.dev's $4.99 monthly plan](https://datacircle.dev/keyword-research-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 AppDrift's $14.99 monthly plan.
[DataForSEO](https://datacircle.dev/keyword-research-apis/dataforseo/top-up-from-50-pay-as-you-go-post-v3-dataforseo-labs-google-keyword-overview-live/llms.txt), [AppDrift](https://datacircle.dev/keyword-research-apis/appdrift/14-99-monthly/llms.txt) and [Bing Webmaster Tools](https://datacircle.dev/keyword-research-apis/bing-webmaster-tools/free-get-webmaster-api-svc-json-getkeywordstats/llms.txt) are the best keyword research API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/keyword-research-apis/gapup/pay-as-you-go
- [Keyword research API: the best SEO keyword data providers](https://datacircle.dev/best-keyword-research-api.txt)
- Get it: https://mcp.gapup.io/docs/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=keyword-research-api-pricing
- Request: `POST https://mcp.gapup.io/api/v1/call/seo_keyword_research`
- API key: not needed
- Its API docs: https://mcp.gapup.io/docs/tools/seo_keyword_research?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=keyword-research-api-pricing
- Sold by: Gapup (https://mcp.gapup.io?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=keyword-research-api-pricing)
- Checked: 2026-11-10

## In the answer

- Completeness: 17%
- Search volume: ✓

## Price

- $ per 1,000 keywords: $50.00
- Per: call
- Billing: pay as you go

## Charges

- Also pays for: nothing else

## In their words

- Their pitch: SEO keyword research from a seed keyword or topic. Uses Google Suggest (public, keyless) to discover related queries at 2 expansion levels, then clusters them by intent.

## Data

- Freshness: 6 hours
- Keep data: no limit
- Use data: Authorized: legitimate AI agents, B2B integrations, security testing on owned assets, research, educational use. Prohibited: violation of applicable law, mass automated outreach without consent, circumventing rate limits, reverse-engineering for cloning, scraping catalog for competing products, fraud, mass-targeted attacks

## Plan

- Pay: per call

## Rate limit

- Per second: 1
- Batch: 1

## Speed

- Answer: in the call or by polling

## The call

- You send: args.seed_keyword. Optional: args.country, args.language, args.async
- Method: POST
- Path: /api/v1/call/seo_keyword_research

## About the plan

- Plan: x402
- Who can get it: anyone

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

seed keyword, country, language, total keywords, intent, keyword, search volume, top opportunities, quality score

## Gapup's plans (1)

- [Gapup, pay as you go](https://datacircle.dev/keyword-research-apis/gapup/pay-as-you-go/llms.txt): $50.00 per 1,000, 17% complete, 6 hours

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

- `POST /api/v1/call/seo_keyword_research`: [Gapup, pay as you go](https://datacircle.dev/keyword-research-apis/gapup/pay-as-you-go/llms.txt)

## Gapup's APIs (6)

- [Gapup: business verification API pricing, 1 plan](https://datacircle.dev/business-verification-apis/gapup/pay-as-you-go/llms.txt)
- [Gapup: similar companies API pricing, 1 plan](https://datacircle.dev/similar-company-apis/gapup/pay-as-you-go/llms.txt)
- [Gapup: tech stack API pricing, 1 plan](https://datacircle.dev/company-technology-apis/gapup/pay-as-you-go/llms.txt)
- [Gapup: keyword research API pricing, 1 plan](https://datacircle.dev/keyword-research-apis/gapup/pay-as-you-go/llms.txt)
- [Gapup: web scraping API pricing, 1 plan](https://datacircle.dev/web-scraping-apis/gapup/pay-as-you-go/llms.txt)
- [Gapup: web search API pricing, 1 plan](https://datacircle.dev/web-search-apis/gapup/pay-as-you-go/llms.txt)

## Gapup: keyword research API alternatives

- [OpenRush, top-up from $10](https://datacircle.dev/keyword-research-apis/openrush/top-up-from-10/llms.txt): $50.00 per 1,000, 83% complete, 1 day
- [Answer Socrates, $390 yearly](https://datacircle.dev/keyword-research-apis/answer-socrates/390-yearly/llms.txt): $65.00 per 1,000, 0% complete, live
- [kwrds.ai, $49 monthly, Starter API Access, POST /keywords-with-volumes](https://datacircle.dev/keyword-research-apis/kwrds-ai/49-monthly-starter-api-access-post-keywords-with-volumes/llms.txt): $81.667 per 1,000, 83% complete, live
- [DataForSEO, top-up from $50, Pay as you go, POST /v3/keywords_data/bing/search_volume/live](https://datacircle.dev/keyword-research-apis/dataforseo/top-up-from-50-pay-as-you-go-post-v3-keywords-data-bing-search-volume-live/llms.txt): $90.00 per 1,000, 67% 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 2026-11-10.

- https://mcp.gapup.io/.well-known/x402?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=keyword-research-api-pricing
- https://mcp.gapup.io/api/v1/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=keyword-research-api-pricing
- https://mcp.gapup.io/api/v1/tools/seo_keyword_research?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=keyword-research-api-pricing
- https://mcp.gapup.io/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=keyword-research-api-pricing
- https://mcp.gapup.io/docs/legal/terms-of-service?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=keyword-research-api-pricing
- https://mcp.gapup.io/docs/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=keyword-research-api-pricing
- https://mcp.gapup.io/docs/tools/seo_keyword_research?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=keyword-research-api-pricing
- https://mcp.gapup.io/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=keyword-research-api-pricing