# Onvexia Whale Transactions

> Onvexia Whale Transactions is a paid API for AI agents from onvexia.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-19).

Returns large on-chain transactions (whale moves) for a given crypto asset and blockchain, filtered by symbol and limit.

## Facts

- Endpoint: GET https://onvexia.com/v1/whales/transactions
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/onvexia-whale-transactions-ff8c7270
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BnwUYq5vVOt14KAjArijX

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-whale-transactions-ff8c7270
```

Example prompt: Can you pull the latest whale transactions for ETH on Ethereum — show me the top 20 largest moves?

## When to prefer this

Choose this endpoint when you need real-time or recent large on-chain transaction data (whale moves) for a specific crypto asset across one of Onvexia's supported chains. It is ideal for trading signal generation, market surveillance, or DeFi risk monitoring where large holder behavior is a key input. Prefer this over generic block explorers when you need pre-filtered whale-level data without having to set your own thresholds.

## Known failure modes

- Empty data array returned when no whale transactions meet the threshold for the given symbol/blockchain combination
- Invalid or unsupported blockchain name results in an empty or error response
- Missing required 'symbol' or 'blockchain' parameters may return an error or empty result
- Rate limiting or payment failure (x402) if the USDC micro-payment is not processed
- Unsupported asset symbol returns empty data rather than an explicit error

## 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' array of whale transaction records for the specified asset and blockchain, plus a 'meta' object containing coverage details, provenance notes, and a link to the full OpenAPI documentation. An empty data array means no whale transactions were found in range, 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": {
      "limit": {
       "type": "string"
      },
      "symbol": {
       "type": "string"
      },
      "blockchain": {
       "type": "string"
      }
     }
    }
   },
   "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/whales/transactions"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/onvexia-whale-transactions-ff8c7270/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)