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Vextorium Extractive Summary
x402
Vextorium Extractive Summary is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-30).
Summarizes a block of text by selecting and returning the most important original sentences, with configurable sentence count and reduction statistics.
Price / call$0.003
Success—
StatusUnknown
How this service works
244 pay-per-call data APIs for AI agents: official statistics and economy (ECB, Fed, Eurostat, World Bank, SEC, BOE, INE), crypto prices and sentiment, Spanish public data, compliance (sanctions, VAT, IBAN, LEI), science, weather, web and developer tools and local AI text tools. Pay in USDC via x402.
Output
Returns a JSON object with: the extractive summary string (sentences copied verbatim from the original), detected language code, percentage of text reduced, count of sentences in the summary, count of sentences in the original, and a note clarifying that sentences are copied not rewritten.
Example use cases
Condense long article for briefing
“Take this 800-word news article and pull out the 5 most important sentences from it verbatim so I can skim the key points quickly: [article text here]”
Summarize research paper abstract
“I have this dense academic abstract — can you extract the 3 most informative sentences from it without rewriting anything? Here's the text: 'Machine learning has advanced rapidly over the past decade. Deep neural networks now outperform humans on many benchmarks. However, interpretability remains a major challenge. Researchers are developing explainability tools. Regulatory bodies are beginning to take notice.'”
Shorten customer feedback for dashboard
“I need to condense this customer review down to just 2 key sentences using the exact original words — no paraphrasing. Here's the review: 'The product arrived quickly and was well packaged. Setup was straightforward and took less than ten minutes. The interface is intuitive. However, battery life was shorter than expected. Customer support responded within an hour and resolved the issue promptly.'”
Technical details
Endpoint
POSThttps://api.vextorium.com/v1/extractive-summary?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to shorten text while preserving the original author's exact wording — ideal for news articles, legal documents, or research papers where paraphrasing would introduce inaccuracy. Prefer it over abstractive summarization when fidelity to the source text matters. The sentence count parameter makes it easy to control output length precisely.
Side effects
- Missing required 'text' field returns a validation error
- Very short input text (1 sentence) may produce a summary identical to the input
- Requesting more sentences than exist in the text may return all available sentences
- Non-UTF-8 encoded text may cause parsing issues
- Payment failure via x402 returns 402 status before processing begins
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | |
| sentences | integer | Sentences to keep (default 5) |
Output
Schema · Response
{
"type": "json",
"example": {
"note": "Extractive summary (it copies sentences from the original, it does not rewrite them).",
"summary": "Artificial intelligence agents are transforming the digital economy. The x402 protocol lets agents pay per call without accounts.",
"language": "en",
"reduction_pct": 54.3,
"summary_sentences": 2,
"original_sentences": 5
}
}Tags
x402
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