# WalletWatch Base Intel API — Whale Transfer Monitor

> WalletWatch Base Intel API — Whale Transfer Monitor is a paid API for AI agents from walletwatch.deleonanalytics.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-20).

Returns recent large ERC-20 token transfers (whale activity) on Base chain, enriched with USD pricing, scanned from live on-chain logs.

## Facts

- Endpoint: GET https://walletwatch.deleonanalytics.com/whales?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/walletwatch-base-intel-api-whale-transfer-monitor-9e6506e8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__F-oB0_Tza1Xzn1RfPrij

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 walletwatch-base-intel-api-whale-transfer-monitor-9e6506e8
```

Example prompt: Show me the top 10 whale transfers for USDC on Base from the last 500 blocks — I want to see who's moving large amounts and the USD value of each transfer.

## When to prefer this

Use this endpoint when you need real-time, USD-enriched whale transfer data specifically on the Base chain from live ERC-20 event logs. Prefer this over generic block explorers when you need structured, pre-enriched output with USD values and configurable scan depth.

## Known failure modes

- Invalid token contract address returns empty results or error
- Requested block depth exceeds available history or node range
- Limit parameter too high may result in slow response or timeout
- No whale transfers found in the specified block range returns empty array
- Network congestion on Base may delay log scanning

## How this service works

Base whale-transfer intelligence from live ERC-20 logs, enriched with USD pricing.

## Output

A list of recent large ERC-20 token transfers on Base chain, each enriched with USD pricing, including sender/receiver wallet addresses, token amounts, and transfer metadata extracted from live on-chain logs.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "limit": {
   "type": "integer",
   "description": "Max whale transfers to return."
  },
  "token": {
   "type": "string",
   "description": "Base token contract address. Defaults to USDC."
  },
  "blocks": {
   "type": "integer",
   "description": "Blocks to scan backwards."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/walletwatch-base-intel-api-whale-transfer-monitor-9e6506e8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from walletwatch.deleonanalytics.com](https://www.zero.xyz/host/walletwatch.deleonanalytics.com/llms.txt)