# Whale Transfer Alerts (Blockscout)

> Whale Transfer Alerts (Blockscout) is a paid API for AI agents from store.agentexchange.work, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Returns the largest recent large-cap token transfers on Base or Ethereum with USD value, wallet labels, and transaction metadata for whale-watching and smart-money flow monitoring.

## Facts

- Endpoint: GET https://store.agentexchange.work/crypto/whales
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/whale-transfer-alerts-blockscout-da06e7ad
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kXVqsj6XInjRT_nXEAFJa

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 whale-transfer-alerts-blockscout-da06e7ad
```

Example prompt: Show me the 20 biggest USDC transfers on Ethereum in the last hour, only ones over $50,000, and flag which wallets are contracts or scam-tagged.

## When to prefer this

Choose this endpoint when you need real-time, ready-parsed whale transfer data with labeled counterparties (scam flags, contract status, verified tags) for Base or Ethereum without needing a Nansen or Whale Alert subscription. Prefer it over raw on-chain RPC calls when you want USD-denominated filtering, human-readable wallet labels, and a structured feed suitable for trading signal pipelines or portfolio monitoring agents.

## Known failure modes

- Unsupported token symbol for the selected chain returns an error or empty result
- min_usd set too high returns an empty whale list if no transfers qualify
- Invalid chain value (not 'base' or 'ethereum') returns a validation error
- limit out of range (>50 or <1) returns a schema validation error
- Blockscout upstream outage causes 503 or timeout
- ERC-20 contract address that is not indexed returns no results

## How this service works

Live whale alerts: the largest recent USDC / WETH / cbBTC / USDT / WBTC transfers on Base or Ethereum, with USD value, from/to wallets, counterparty labels (contract? verified? scam-flagged?), tx hash and age. The smart-money / whale-watching feed trading agents poll to front-run big flows — a Nansen-style whale alert without the subscription. Each whale wallet chains into /crypto/smart-money (what is this wallet doing?) and /crypto/wallet (what does it hold?).

## Output

A JSON array of recent large token transfers, each including the USD value, sender and recipient wallet addresses with counterparty labels (contract, verified, or scam-flagged), the transaction hash, token symbol, and transfer age — ordered by transfer size descending.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "chain": {
       "type": "string",
       "description": "base|ethereum (default base)"
      },
      "limit": {
       "type": "number",
       "description": "1-50, default 15"
      },
      "token": {
       "type": "string",
       "description": "usdc|weth|cbbtc (base) or usdc|usdt|weth|wbtc (ethereum), or any ERC-20 contract 0x... (default usdc)"
      },
      "min_usd": {
       "type": "number",
       "description": "Minimum transfer size in USD (default 10000)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "count": {
       "type": "number"
      },
      "whales": {
       "type": "array"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/whale-transfer-alerts-blockscout-da06e7ad/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from store.agentexchange.work](https://www.zero.xyz/host/store.agentexchange.work/llms.txt)