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Related Keywords Expander
x402
Related Keywords Expander is a paid API for AI agents from seo.openverbs.com, paid per call via x402, $0.04/call, status unknown (last checked 2026-10-11).
Expands a seed keyword into a set of related keywords by traversing the related-searches graph, with control over depth, limit, language, and location.
Price / call$0.04
Success—
StatusUnknown
How this service works
Related keywords API - expand a seed keyword using Google's "searches related to" graph, returning the related keywords (traversed to a configurable depth) each with monthly search volume, CPC, competition, keyword difficulty and search intent, plus the further related terms branching off each. For content-cluster planning and keyword discovery. No matches returns empty results.
Output
A list of related keywords derived by traversing the related-searches graph from the seed keyword, filtered by the specified depth, limit, language, and location. Each keyword represents a term users commonly search in relation to the seed.
Example use cases
Content cluster planning for a blog
“I'm planning a content hub around 'home espresso machine' — can you traverse the related-searches graph 3 levels deep and return up to 80 related keywords in English for the US so I can identify subtopics to cover?”
Localized keyword research for French market
“I need to find related keywords for 'assurance voiture' targeting French speakers — run it in French (fr) for France (location code 2250), 1 level deep, and give me the top 30 results.”
Competitive niche discovery for new product launch
“We're launching a new yoga mat brand — can you expand 'yoga mat' 2 levels deep and return up to 100 related keywords in English for the US so we can find underserved niche terms?”
Technical details
Endpoint
POSThttps://seo.openverbs.com/v1/related-keywords?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to discover and expand a seed keyword into a broader set of related search terms, especially when you need graph traversal depth control and localization by language and country. Prefer it over static keyword databases when you want dynamically generated related-search expansions tied to real search behavior. It is distinct from keyword metrics (which scores existing keywords) or keyword gap analysis (which compares against competitors).
Side effects
- Invalid or unsupported language code returns validation error
- Unknown or invalid locationCode causes empty or error response
- Exceeding keyword maxLength (80 chars) returns validation error
- depth out of range (>4 or <0) returns schema validation error
- limit out of range (<1 or >100) returns schema validation error
- Payment failure or insufficient USDC balance blocks the call
- Very niche seed keywords with no related searches return empty list
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| depth | integer | How many levels of the related-searches graph to traverse (0-4). Defaults to 1. |
| limit | integer | Maximum keywords to return. Defaults to 20. |
| keyword | string | Seed keyword to expand. |
| languageCode | string | Language code (2-letter). Defaults to en. |
| locationCode | integer | DataForSEO location code. Defaults to 2840 (United States). |
Tags
x402
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