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Keyword Autocomplete & Search Suggest API
x402
Keyword Autocomplete & Search Suggest API is a paid API for AI agents from x402-deployer.x402-deployer.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).
Aggregates and de-duplicates keyword autocomplete suggestions from Wikipedia OpenSearch and DuckDuckGo into a ranked list for SEO research and query expansion.
Price / call$0.002
Success—
StatusUnknown
How this service works
Keyword autocomplete / search suggest / SEO keyword research / query expansion / autocomplete suggestions. Aggregates suggestions from Wikipedia OpenSearch + DuckDuckGo's autocomplete (both public, no auth) into a de-duplicated ranked list. Useful for SEO content-gap analysis, LLM query expansion, agent-driven research.
Output
A de-duplicated, ranked list of autocomplete keyword suggestions aggregated from Wikipedia OpenSearch and DuckDuckGo's autocomplete endpoints, covering related terms and query expansions for the input seed keyword.
Example use cases
SEO content gap analysis
“I'm writing blog content about 'home solar panels' — can you pull keyword suggestions and autocomplete ideas from Wikipedia and DuckDuckGo so I can find angles I haven't covered yet?”
LLM query expansion for research agent
“I need to expand the query 'machine learning explainability' into a broad set of related search terms and autocomplete suggestions — can you aggregate results from Wikipedia and DuckDuckGo and give me a ranked, deduplicated list?”
Competitor brand keyword research
“What do Wikipedia and DuckDuckGo autocomplete suggest when someone starts typing 'Notion app'? Give me a ranked list of all unique suggestions so I can see what people associate with that brand.”
Technical details
Endpoint
POSThttps://x402-deployer.x402-deployer.workers.dev/keyword-suggestWhen to prefer
Choose this endpoint when you need free-tier autocomplete signals from Wikipedia and DuckDuckGo combined — ideal for SEO content gap analysis, LLM query expansion, or keyword brainstorming without needing a Google Ads or paid SEO API key. Best for agents that need broad, organic search-suggest data quickly at low cost.
Side effects
- Empty or very short seed keyword returns few or no suggestions
- Highly niche or misspelled queries may return sparse results from upstream sources
- Upstream Wikipedia or DuckDuckGo services temporarily unavailable causing partial or failed response
- Rate limiting or payment failure (x402) blocks the request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
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