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SpyFu Keyword Expansions API
x402
SpyFu Keyword Expansions 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 2026-09-15).
Returns related and expanded keyword suggestions for a given seed keyword using SpyFu's keyword database
Price / call$0.01
Success—
StatusDown
How this service works
GET /apis/keyword_api/v2/related/getKeywordExpansions
Output
A list of related and expanded keywords derived from the seed keyword, likely including search volume, competition data, and semantic variations as returned by SpyFu's keyword expansion database.
Example use cases
Example prompt
“Can you pull up related keyword expansions for 'project management software' from SpyFu so I can build out my SEO keyword list?”
Technical details
Endpoint
GEThttps://spyfu.x402.paysponge.com/apis/keyword_api/v2/related/getKeywordExpansionsWhen to prefer
Choose this endpoint when you need to expand a seed keyword into a broader set of related search terms for SEO or PPC planning, especially when SpyFu's proprietary keyword database is preferred over generic keyword tools. Ideal for building keyword clusters or discovering long-tail variants.
Side effects
- Missing required keyword parameter returns 400 error
- Empty or unrecognized keyword returns empty results set
- Rate limiting or payment failure returns 402 or 429
- SpyFu database has no data for niche/obscure keywords
- Network timeout from upstream SpyFu API
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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