# 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 2026-10-16).

Extracts keywords and keyphrases from Spanish or English text using the RAKE algorithm, scored by frequency and degree, plus most frequent word counts — for tagging, indexing, and SEO.

## Facts

- Endpoint: POST https://api.vextorium.com/palabras-clave-pago?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vextorium-keyword-keyphrase-extractor-c47a9c3f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_g63g1DS0w5dQ11gciq5Oy

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-c47a9c3f -d '<json body>'
```

Example prompt: Extract the top 10 keywords and keyphrases from this article text using RAKE scoring — it's in English: 'Artificial intelligence agents are transforming the digital economy. They pay for data per use via APIs. USDC micropayments make this business model viable.'

## When to prefer this

Choose this endpoint when you need deterministic, rule-based keyword extraction (RAKE algorithm) without AI model inference costs or latency — ideal for high-volume SEO tagging, content indexing pipelines, or any scenario where reproducibility and speed matter more than semantic nuance. It supports both Spanish and English, making it useful for bilingual content workflows. Prefer it over AI-based NLP services when budget is tight ($0.003/call), outputs need to be consistent across identical inputs, or when you want frequency-weighted phrase scoring without a large language model.

## Known failure modes

- Missing 'texto' field returns a validation error
- Empty or very short text may yield no keyphrases
- Very long texts may slow response or hit size limits
- Non-Spanish/non-English text may produce unreliable results since only those two languages are supported
- Malformed JSON body returns an error

## How this service works

Extract keywords and keyphrases from a text without AI (RAKE algorithm scoring frequency and degree), in Spanish or English, plus most frequent words. For tagging, indexing and SEO.

## Output

A JSON object with the auto-detected language code (e.g. 'en' or 'es'), an array of keyphrases each with the phrase text, occurrence count, and RAKE score (higher = more significant), plus an array of the most frequent individual words each with their word and count.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "texto": {
   "type": "string"
  },
  "limite": {
   "type": "integer"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "idioma": "en",
  "frases_clave": [
   {
    "frase": "business model viable",
    "veces": 1,
    "puntuacion": 9
   },
   {
    "frase": "usdc micropayments make",
    "veces": 1,
    "puntuacion": 8
   },
   {
    "frase": "artificial intelligence agents",
    "veces": 1,
    "puntuacion": 8
   },
   {
    "frase": "agents pay",
    "veces": 1,
    "puntuacion": 4
   },
   {
    "frase": "digital economy",
    "veces": 1,
    "puntuacion": 4
   }
  ],
  "palabras_frecuentes": [
   {
    "veces": 3,
    "palabra": "agents"
   },
   {
    "veces": 2,
    "palabra": "micropayments"
   },
   {
    "veces": 1,
    "palabra": "artificial"
   },
   {
    "veces": 1,
    "palabra": "intelligence"
   },
   {
    "veces": 1,
    "palabra": "transforming"
   },
   {
    "veces": 1,
    "palabra": "digital"
   },
   {
    "veces": 1,
    "palabra": "economy"
   },
   {
    "veces": 1,
    "palabra": "pay"
   },
   {
    "veces": 1,
    "palabra": "data"
   },
   {
    "veces": 1,
    "palabra": "per"
   },
   {
    "veces": 1,
    "palabra": "use"
   },
   {
    "veces": 1,
    "palabra": "apis"
   },
   {
    "veces": 1,
    "palabra": "usdc"
   },
   {
    "veces": 1,
    "palabra": "make"
   },
   {
    "veces": 1,
    "palabra": "business"
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vextorium-keyword-keyphrase-extractor-c47a9c3f/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)