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SpyFu Related Keywords API
x402
SpyFu Related Keywords API is a paid API for AI agents from spyfu.x402.paysponge.com, paid per call via x402, $0.01/call, status down (last checked 2026-09-14).
Returns related keywords for a given seed keyword using SpyFu's keyword relationship data
Price / call$0.01
Success—
StatusDown
How this service works
GET /apis/keyword_api/v2/related/getRelatedKeywords
Output
A list of related keywords associated with the input seed keyword, drawn from SpyFu's keyword relationship database, useful for expanding SEO campaigns and content strategy.
Example use cases
Expand PPC campaign keyword coverage
“Can you find all the related keywords for 'fitness tracker' that I should add to my Google Ads campaign? I want to capture more relevant search traffic.”
Build content clusters for SEO strategy
“Help me discover keywords related to 'sustainable packaging' so I can plan a content series that covers the whole topic cluster. What variations should I target?”
Identify user search intent variations
“What keywords does SpyFu show as related to 'remote work tools'? I need to understand what else my target audience is actually searching for beyond the main term.”
Technical details
Endpoint
GEThttps://spyfu.x402.paysponge.com/apis/keyword_api/v2/related/getRelatedKeywordsWhen to prefer
Use this endpoint when you need to discover semantically or contextually related keywords for a given seed term, particularly for SEO expansion, content clustering, or paid search campaign broadening. Prefer this over competitor-focused endpoints when the goal is keyword discovery rather than competitive analysis.
Side effects
- Missing required query parameters returns an error or empty result
- Invalid keyword input may return no related keywords
- Payment failure via x402 prevents API access
- Rate limiting if too many requests are made in quick succession
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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