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Vextorium Keyword & Keyphrase Extractor
x402
Vextorium Keyword & Keyphrase Extractor is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-15).
Extracts keywords, keyphrases, and frequent words from text using the RAKE algorithm (no AI), supporting English and Spanish, for tagging, indexing, and SEO.
Price / call$0.003
Success—
StatusUnknown
How this service works
558 pay-per-call data APIs for AI agents: Solana and EVM on-chain data, tokenized stocks, DeFi, Hyperliquid, economy and official statistics, FX, validation, web and developer tools. Pay in USDC via x402.
Output
Returns the detected language, an array of scored keyphrases (each with a RAKE score, occurrence count, and the phrase text), and an array of the most frequent individual words with their counts.
Example use cases
SEO tagging for blog content
“Pull the top keyphrases and most frequent words from this article so I can use them as SEO tags: 'Decentralized finance is reshaping how individuals and institutions manage assets, offering yield opportunities without traditional intermediaries.'”
Auto-indexing Spanish documents
“I have a Spanish product description I need to index — extract the main keywords and keyphrases from it: 'Los pagos digitales permiten a los usuarios transferir dinero de forma rápida y segura sin necesidad de un banco.'”
Topic identification in customer reviews
“Find the key topics and most-repeated words in this customer review so I can categorize it: 'The onboarding process was confusing and slow, but once set up, the dashboard was intuitive and the reports were very detailed and useful.'”
Technical details
Endpoint
POSThttps://api.vextorium.com/v1/keywords?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need fast, deterministic, non-AI keyword extraction using the RAKE algorithm — ideal for high-volume tagging, SEO enrichment, or content indexing pipelines where AI overhead is unnecessary, and when you need Spanish or English support with scoring based on word frequency and co-occurrence.
Side effects
- Missing or empty 'text' field returns a validation error
- Very short texts may yield no meaningful keyphrases
- Unsupported language input may produce low-quality or empty keyphrase results
- Exceeding rate limits or payment failure returns HTTP 402 or 429
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | |
| limit | integer |
Output
Schema · Response
{
"type": "json",
"example": {
"language": "en",
"key_sentences": [
{
"score": 9,
"times": 1,
"sentence": "business model viable"
},
{
"score": 8,
"times": 1,
"sentence": "usdc micropayments make"
}
],
"frequent_words": [
{
"word": "agents",
"times": 3
},
{
"word": "micropayments",
"times": 2
}
]
}
}Tags
x402
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