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x402node Keyword Extractor
x402
x402node Keyword Extractor is a paid API for AI agents from api.x402node.dev, paid per call via x402, $0.0022/call, status unknown (last checked 2026-09-14).
Extracts and ranks the top N significant keywords from English or multilingual text, filtering stopwords and scoring by frequency and importance
Price / call$0.0022
Success—
StatusUnknown
How this service works
extract keywords, keyword extraction, keyword extractor, find keywords, top keywords, SEO keywords, automatic keyword extraction, document keywords. Extract significant keywords from any English or multilingual text. Returns top N keywords ranked by frequency and importance with stopwords filtered. For AI agents doing SEO analysis, content tagging, document categorization, topic modeling. Accepts payment on Base or Solana — either network works.
Output
Returns a ranked list of the top N keywords extracted from the input text, scored by frequency and importance, with common stopwords filtered out — suitable for SEO tagging, content categorization, or topic modeling pipelines.
Example use cases
Example prompt
“Pull the top 10 keywords from this article text for SEO tagging: 'Artificial intelligence is transforming how businesses operate, automating repetitive tasks and enabling smarter decision-making through machine learning and data analytics.'”
Technical details
Endpoint
GEThttps://api.x402node.dev/text/keywordsWhen to prefer
Choose this endpoint when you need fast, lightweight keyword extraction from text without requiring a full NLP pipeline or ML model inference — ideal for SEO tagging, document categorization, search query expansion, or topic labeling at low cost ($0.0022/call). Prefer it over heavier NLP APIs when you want stopword-filtered, frequency-ranked keywords without sentiment or entity recognition overhead.
Side effects
- Empty or whitespace-only text input returns no keywords or an error
- Text too short to yield meaningful keywords beyond stopwords
- Non-English text may have reduced accuracy if stopword lists are incomplete for that language
- Requesting more keywords (N) than distinct meaningful words in the text may return fewer results than requested
- Malformed request body or missing required fields returns a 4xx error
Input
{
"n": 5,
"text": "Machine learning algorithms are revolutionizing data science and artificial intelligence applications across industries.",
"language": "en"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
{
"_hint": "x402 paid endpoints for AI agents — x402node.dev (utilities) · cn402.com (Chinese culture)",
"keywords": [
{
"word": "machine",
"count": 1
},
{
"word": "learning",
"count": 1
},
{
"word": "algorithms",
"count": 1
},
{
"word": "revolutionizing",
"count": 1
},
{
"word": "data",
"count": 1
},
{
"word": "science",
"count": 1
},
{
"word": "artificial",
"count": 1
},
{
"word": "intelligence",
"count": 1
},
{
"word": "applications",
"count": 1
},
{
"word": "industries",
"count": 1
}
],
"language": "en",
"text_length": 120,
"total_tokens": 10,
"processing_ms": 1,
"unique_keywords": 10
}Tags
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