# Onvexia Natural Language Screen

> Onvexia Natural Language Screen is a paid API for AI agents from onvexia.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-19).

Screen crypto assets using a natural language query against Onvexia's fused blockchain analytics database covering thousands of assets across ten chains

## Facts

- Endpoint: GET https://onvexia.com/v1/screen/nl
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/onvexia-natural-language-screen-3d94322c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Aq_DqVlHnPrGVWAOzfL9f

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-natural-language-screen-3d94322c
```

Example prompt: Use Onvexia to screen crypto assets and find top gainers with rising social volume right now — give me the list with coverage details.

## When to prefer this

Choose this endpoint when you want to screen or discover crypto assets using plain English queries against a broad, fused dataset covering thousands of tokens across ten blockchains, labelled addresses, document analysis, and supply-age history back to 2008. Prefer it over raw on-chain data APIs when you need multi-signal fusion (social, on-chain, document) in one call, or when you need natural language flexibility rather than rigid filter parameters. Best suited for discovery and screening workflows rather than deep single-asset analysis.

## Known failure modes

- Empty data array when no assets match the query criteria — not an error
- Null label in meta means no label is held for that subject, not that it is safe or clean
- Query too vague or ambiguous may return broad or unexpected results
- Payment required (402) if USDC payment not provided
- Rate limiting if too many requests per period
- Unsupported chain or asset may return empty coverage metadata

## 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

Returns a JSON object with a 'data' field containing an array of matching assets or analytics rows based on the natural language query, and a 'meta' field describing coverage scope, provenance, what was measured, and what data is not held. An empty data array means no assets matched the query, not that the metric is unsupported.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "properties": {
  "input": {
   "type": "object",
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "q": {
       "type": "string",
       "description": "e.g. 'top gainers with rising social volume'"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "properties": {
    "example": {
     "type": "object",
     "properties": {
      "data": {
       "description": "The result — an array or object depending on the endpoint. An empty array means no rows in range, never that the metric is unsupported."
      },
      "meta": {
       "type": "object",
       "description": "Coverage and provenance: what was measured, and what is not held. A null label means no label is held, never that the subject is safe."
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/onvexia-natural-language-screen-3d94322c/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)