# Onvexia NLP Aspects — Blockchain Asset Sentiment & Topic Analysis

> Onvexia NLP Aspects — Blockchain Asset Sentiment & Topic Analysis is a paid API for AI agents from onvexia.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-19).

Returns NLP-derived aspect-level sentiment and thematic signals for a specified crypto asset, synthesized from half a million analysed blockchain-related documents.

## Facts

- Endpoint: GET https://onvexia.com/v1/nlp/aspects/%7Basset%7D
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/onvexia-nlp-aspects-blockchain-asset-sentiment-topic-analysis-f0c9fedc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rx3eiYsqeO6Xih6LNGYKj

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 onvexia-nlp-aspects-blockchain-asset-sentiment-topic-analysis-f0c9fedc
```

Example prompt: Pull the NLP aspect analysis for Ethereum from Onvexia — I want to see what topics and sentiment themes are showing up across their document corpus right now.

## When to prefer this

Choose this endpoint when you need narrative-level, NLP-derived aspect sentiment for a specific crypto asset rather than raw price or on-chain metrics. It is particularly valuable when you want to understand thematic and sentiment patterns drawn from a large document corpus — not just social media or news headline counts. Prefer it over generic sentiment APIs when you need blockchain-native coverage with labelled addresses and multi-chain context baked in.

## Known failure modes

- Unknown or unsupported asset identifier returns an empty data array
- Asset not covered across the ten supported chains returns no results
- Malformed asset path parameter returns a 400-level error
- Payment not processed (x402 flow incomplete) results in a 402 Payment Required response
- Rate limiting or quota exceeded may produce 429 errors

## How this service works

Thousands of assets across ten chains, half a million analysed documents, labelled addresses and supply-age history reaching back to 2008 — fused into one reading per asset. REST, SQL, GraphQL and MCP.

## Output

A JSON array of aspect-level NLP signals for the requested asset, including identified themes, sentiment dimensions, and scores synthesized from Onvexia's corpus of analysed blockchain documents. Also includes a meta object pointing to the full OpenAPI spec.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": [],
  "meta": {
   "docs": "https://onvexia.com/openapi.json",
   "endpoint": "/v1/nlp/aspects/{asset}"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/onvexia-nlp-aspects-blockchain-asset-sentiment-topic-analysis-f0c9fedc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from onvexia.com](https://www.zero.xyz/host/onvexia.com/llms.txt)