# Vextorium Keyword & Keyphrase Extractor

> 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.

## Facts

- Endpoint: POST https://api.vextorium.com/v1/keywords?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vextorium-keyword-keyphrase-extractor-7f720f26
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_aYkzLMN_bIzvZ9HmLD_Ke

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability vextorium-keyword-keyphrase-extractor-7f720f26 -d '<json body>'
```

Example prompt: Extract the top 10 keywords and keyphrases from this blog post text using RAKE scoring, in English: 'Micropayments using USDC are transforming how AI agents pay for services, making it easier than ever to build viable business models without traditional payment rails.'

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string"
  },
  "limit": {
   "type": "integer"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "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
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vextorium-keyword-keyphrase-extractor-7f720f26/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.vextorium.com](https://www.zero.xyz/host/api.vextorium.com/llms.txt)