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OpenVerbs SEO Keyword Variations API
x402
OpenVerbs SEO Keyword Variations API is a paid API for AI agents from seo.openverbs.com, paid per call via x402, $0.04/call, status unknown (last checked 2026-10-29).
Expands a seed keyword phrase into related keyword variations containing that phrase, each with Google monthly search volume, CPC, competition, keyword difficulty, and search intent.
Price / call$0.04
Success—
StatusUnknown
How this service works
Keyword variations API: expand a seed phrase into keywords containing that phrase, such as 'running shoes' into 'running shoes for women'. Each includes Google monthly search volume, CPC, competition, keyword difficulty and search intent. No matches returns empty results.
Output
A list of keyword variation strings that each contain the seed phrase, annotated with Google monthly search volume, cost-per-click (CPC), competition level, keyword difficulty score (0-100), and search intent classification. Returns an empty result set if no matching variations are found.
Example use cases
Content cluster planning for blog
“I'm writing a blog about home coffee brewing — can you expand the phrase 'pour over coffee' into up to 30 keyword variations for a US English audience, with their monthly search volumes and keyword difficulty so I can pick the best topics to cover?”
PPC ad group keyword discovery
“I need to build a Google Ads campaign around 'noise cancelling headphones' — find me up to 50 keyword variations containing that phrase for the US market, with CPC and competition data so I can estimate my budget.”
International SEO keyword research
“I'm targeting the UK market — can you expand the seed phrase 'meal prep ideas' into keyword variations for location code 2826 with language code EN, returning up to 40 results with search volume, difficulty, and search intent?”
Technical details
Endpoint
POSThttps://seo.openverbs.com/v1/keyword-variations?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to discover keyword variations that literally contain a specific seed phrase, especially when you want rich per-keyword metrics (volume, CPC, competition, difficulty, intent) in a single call. Prefer this over the Related Keywords endpoint when you specifically want phrase-match expansions rather than semantically related terms. Ideal for building phrase-match ad groups, content clusters around a core topic, or long-tail keyword lists anchored to a specific phrase.
Side effects
- No keyword variations found for the seed phrase returns empty results
- Invalid or unsupported language code returns an error
- Unsupported location code returns an error or empty results
- Seed phrase exceeds 80-character maximum returns a validation error
- Limit parameter outside 1-100 range returns a validation error
- Payment failure or insufficient USDC balance prevents the call from completing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| limit | integer | Maximum suggestions to return. Defaults to 20. |
| keyword | string | Seed phrase; suggestions contain this phrase. |
| 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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