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SpyFu Question Keywords API
x402
SpyFu Question Keywords API is a paid API for AI agents from spyfu.x402.paysponge.com, paid per call via x402, $0.010000/call, status down (last checked 2026-09-15).
Returns question-based keyword suggestions related to a given topic or keyword using SpyFu's keyword intelligence data
Price / call$0.010000
Success—
StatusDown
How this service works
GET /apis/keyword_api/v2/related/getQuestionKeywords
Output
A list of question-based keyword suggestions (e.g. 'how to install solar panels', 'what is the cost of solar panels') related to the input topic, sourced from SpyFu's keyword database, useful for content strategy and featured snippet targeting.
Example use cases
Example prompt
“What question-based keywords do people search for around 'home solar panels'? I want to find SEO content ideas based on real search questions people ask.”
Technical details
Endpoint
GEThttps://spyfu.x402.paysponge.com/apis/keyword_api/v2/related/getQuestionKeywordsWhen to prefer
Use this endpoint when you need question-format keyword ideas (who, what, how, why, when) for SEO content planning, FAQ pages, or featured snippet optimization. Prefer this over general keyword tools when you specifically need interrogative phrasing variants of a seed keyword.
Side effects
- Missing required query parameter returns an error or empty result
- Invalid or unsupported keyword format may return empty keyword list
- Rate limiting or payment failure returns 402 Payment Required
- SpyFu data unavailable for very niche or obscure topics returns empty list
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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