# Onvexia Substance — Blockchain Asset Analytics Feed

> Onvexia Substance — Blockchain Asset Analytics Feed is a paid API for AI agents from onvexia.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-17).

Returns a paginated list of blockchain assets enriched with on-chain analytics including labelled addresses, supply-age history, and document-derived signals fused into a single reading per asset.

## Facts

- Endpoint: GET https://onvexia.com/v1/ai/substance
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/onvexia-substance-blockchain-asset-analytics-feed-a30b8027
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_H4iSjqEgy68bLrs91jQRq

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-substance-blockchain-asset-analytics-feed-a30b8027
```

Example prompt: Pull me up to 100 blockchain assets from Onvexia with their on-chain substance analytics — I want to see labelled addresses, supply-age history, and document evidence scores across all supported chains.

## When to prefer this

Choose this endpoint when you need a broad, pre-fused per-asset intelligence feed across many blockchain assets at once — particularly when you require supply-age history reaching back to 2008, labelled addresses, or document-derived on-chain signals fused into a single record. Prefer this over building your own aggregation when coverage transparency (via the meta field) matters to your use case. It is the right choice when you want multi-chain breadth (ten chains) rather than deep per-transaction data on a single chain.

## Known failure modes

- Empty data array returned when no assets match — this means no rows in range, not that the metric is unsupported
- limit parameter exceeding 300 may be rejected or capped
- 402 Payment Required if USDC micropayment via x402 is not attached to the request
- meta.label being null means no label is held for that address, not that the subject is safe
- Malformed limit query parameter (non-numeric string) may return 400

## 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 object with a 'data' array of asset analytics records (empty array if no rows, not unsupported) and a 'meta' object describing coverage and provenance — what was measured, what is not held, and a link to the full OpenAPI spec. Each asset record contains fused signals from labelled addresses, supply-age history back to 2008, and half a million analysed documents across ten chains.

## 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": {
      "limit": {
       "type": "string",
       "description": "Assets to return, default 50, max 300"
      }
     }
    }
   },
   "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/ai/substance"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/onvexia-substance-blockchain-asset-analytics-feed-a30b8027/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)