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Long-tail Keyword Suggestions
x402
Long-tail Keyword Suggestions 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).
Returns up to 100 long-tail keyword suggestions that contain a given seed phrase, with optional language and location targeting.
Price / call$0.04
Success—
StatusUnknown
How this service works
Keyword suggestions API - find long-tail keywords that contain your seed phrase (full-text phrase match), each with Google monthly search volume, CPC, competition, keyword difficulty and search intent. Complements keyword-ideas (semantically related terms) with literal phrase-match variations. For long-tail content and PPC research. No matches returns empty results.
Output
An array of long-tail keyword strings (up to the requested limit) that each contain the provided seed phrase, tailored to the specified language and geographic market. Useful for content planning, PPC keyword lists, and SEO gap analysis.
Example use cases
Blog content ideation for niche topics
“I'm writing a series of articles about 'air fryer recipes' — can you pull 30 long-tail keyword suggestions in English for the US so I know what specific angles to cover?”
PPC campaign keyword expansion
“We're launching Google Ads for 'project management software' — give me up to 100 long-tail keyword suggestions in English targeting the US so I can build out our ad groups.”
International SEO keyword research
“I need 25 long-tail keyword suggestions around 'apprendre le piano' in French — use language code 'fr' and set the location to France so the results are relevant to that market.”
Technical details
Endpoint
POSThttps://seo.openverbs.com/v1/keyword-suggestions?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to expand a specific seed phrase into long-tail variations rather than broad topic ideation. It's ideal for content marketers, SEO specialists, and PPC managers who already have a target phrase and want to discover longer, more specific keyword variants. Prefer this over general keyword ideas endpoints when you need suggestions that strictly contain the seed phrase.
Side effects
- Invalid or unsupported language code returns a validation error
- Unknown or invalid DataForSEO location code returns an error or empty results
- Seed keyword exceeding 80 characters is rejected
- Limit value outside 1–100 range is rejected
- No suggestions found for highly obscure or misspelled seed phrases
- Payment failure (x402) if USDC balance is insufficient
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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