# Kadec0, pay as you go: Related keywords API

> Google Trends related queries for a keyword. Returns the searches people run alongside a keyword in a given country: top queries scored 0-100 relative to each other, and rising queries with their percentage growth. Google Trends keyword expansion for SEO keyword research, content planning, and spotting breakout search demand early.

Kadec0's x402 pay per call plan lets you call the related keywords API. We check each provider's docs for 6 fields: Search volume, Monthly trend, Cost per click, Competition and 2 more. Kadec0's docs list none of the 6.
We haven't run Kadec0 through [our related keywords API benchmark](https://datacircle.dev/best-related-keywords-api.txt) yet.
We rank 227 plans for related keywords APIs by price. Half the plans cost $0.594 or less per 1,000 keywords.
[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. [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. seodata.dev's $4.99 monthly plan 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), [Bing Webmaster Tools](https://datacircle.dev/related-keywords-apis/bing-webmaster-tools/free/llms.txt) and [Bukvarix](https://datacircle.dev/related-keywords-apis/bukvarix/free-without-registration-post-v1-mkeywords/llms.txt) are the best related keywords API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/related-keywords-apis/kadec0/pay-as-you-go
- [Related keywords API: the best SEO keyword data providers](https://datacircle.dev/best-related-keywords-api.txt)
- Get it: https://api.kadec0.xyz/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- Request: `GET https://api.kadec0.xyz/v1/related-queries`
- API key: not needed
- Its API docs: https://api.kadec0.xyz/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing#/default/handler_v1_related_queries_get
- Sold by: Kadec0 (https://api.kadec0.xyz?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing)
- Checked: 2026-11-09

## In the answer

- Completeness: 0%

## Price

- Per: page, size not stated
- Billing: pay as you go

## Charges

- Also pays for: nothing else

## In their words

- Their pitch: Google Trends related queries for a keyword. Returns the searches people run alongside a keyword in a given country: top queries scored 0-100 relative to each other, and rising queries with their percentage growth. Google Trends keyword expansion for SEO keyword research, content planning, and spotting breakout search demand early.

## Data

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

## Plan

- Pay: per call

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: keyword. Optional: geo
- Method: GET
- Path: /v1/related-queries

## About the plan

- Plan: x402 pay per call
- Who can get it: anyone with a wallet paying each call in USDC on Base (x402), with no account or API key

## The 8 fields the plan's answer can hold

keyword, country code, timeframe, top related query, top query score, rising related query, rising query growth, queried at

## Kadec0's plans (1)

- [Kadec0, pay as you go](https://datacircle.dev/related-keywords-apis/kadec0/pay-as-you-go/llms.txt): 0% complete

## Kadec0's calls for this API (1)

- `GET /v1/related-queries`: [Kadec0, pay as you go](https://datacircle.dev/related-keywords-apis/kadec0/pay-as-you-go/llms.txt)

## Kadec0's APIs (9)

- [Kadec0: GitHub repository API pricing, 1 plan](https://datacircle.dev/github-repository-apis/kadec0/pay-as-you-go/llms.txt)
- [Kadec0: Hacker News search API pricing, 1 plan](https://datacircle.dev/hacker-news-search-apis/kadec0/pay-as-you-go/llms.txt)
- [Kadec0: company enrichment API pricing, 1 plan](https://datacircle.dev/company-enrichment-apis/kadec0/pay-as-you-go/llms.txt)
- [Kadec0: tech stack API pricing, 1 plan](https://datacircle.dev/company-technology-apis/kadec0/pay-as-you-go/llms.txt)
- [Kadec0: email verification API pricing, 1 plan](https://datacircle.dev/validate-email-apis/kadec0/pay-as-you-go/llms.txt)
- [Kadec0: related keywords API pricing, 1 plan](https://datacircle.dev/related-keywords-apis/kadec0/pay-as-you-go/llms.txt)
- [Kadec0: web scraping API pricing, 1 plan](https://datacircle.dev/web-scraping-apis/kadec0/pay-as-you-go/llms.txt)
- [Kadec0: web search API pricing, 1 plan, GET /v1/serp-batch](https://datacircle.dev/web-search-apis/kadec0/pay-as-you-go-x402-pay-per-call-get-v1-serp-batch/llms.txt)
- [Kadec0: web search API pricing, 1 plan, GET /v1/serp-multi](https://datacircle.dev/web-search-apis/kadec0/pay-as-you-go-x402-pay-per-call-get-v1-serp-multi/llms.txt)
- [Kadec0: web search API pricing, 1 plan, GET /v1/serp-read](https://datacircle.dev/web-search-apis/kadec0/pay-as-you-go-x402-pay-per-call-get-v1-serp-read/llms.txt)
- [Kadec0: web search API pricing, 1 plan, GET /v1/serp](https://datacircle.dev/web-search-apis/kadec0/pay-as-you-go-x402-pay-per-call-get-v1-serp/llms.txt)
- [Kadec0: domain WHOIS API pricing, 1 plan, GET /v1/whois-bulk](https://datacircle.dev/domain-whois-apis/kadec0/pay-as-you-go-x402-pay-per-call-get-v1-whois-bulk/llms.txt)
- [Kadec0: domain WHOIS API pricing, 1 plan, GET /v1/domain-age-check](https://datacircle.dev/domain-whois-apis/kadec0/pay-as-you-go-x402-pay-per-call-get-v1-domain-age-check/llms.txt)
- [Kadec0: domain WHOIS API pricing, 1 plan, GET /v1/domain-info](https://datacircle.dev/domain-whois-apis/kadec0/pay-as-you-go-x402-pay-per-call-get-v1-domain-info/llms.txt)

## Kadec0: related keywords API alternatives

- [AnyAPI, pay as you go, Pay per call with x402 and MPP, POST /v1/run/ahrefs.keyword_ideas](https://datacircle.dev/related-keywords-apis/anyapi/pay-as-you-go-pay-per-call-with-x402-and-mpp-post-v1-run-ahrefs-keyword-ideas/llms.txt): 33% complete, stored
- [ForgeMesh, pay as you go, x402, GET /v1/query-expand](https://datacircle.dev/related-keywords-apis/forgemesh/pay-as-you-go-x402-get-v1-query-expand/llms.txt): 0% 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 2026-11-09.

- https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://api.kadec0.xyz/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://api.kadec0.xyz/.well-known/x402?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://api.kadec0.xyz/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing
- https://api.kadec0.xyz/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=related-keywords-api-pricing