# Whale Alert On-Chain Transaction Tracker

> Whale Alert On-Chain Transaction Tracker is a paid API for AI agents from whale-alert.api.klymax402.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).

Returns large cryptocurrency transactions (whale movements) on Ethereum or Base chains filtered by a minimum ETH value threshold

## Facts

- Endpoint: GET https://whale-alert.api.klymax402.com/api/whales
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/whale-alert-api-klymax402-com-14db5d3f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tio5CaKKCvYN6bMy4MCSR

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-alert-api-klymax402-com-14db5d3f
```

Example prompt: Show me all whale transactions on Ethereum where the value is at least 500 ETH — I want to see what big wallets are moving right now.

## When to prefer this

Use this endpoint when you need real-time or recent large on-chain transaction data for Ethereum or Base chains, specifically to detect whale wallet activity above a configurable ETH threshold. Prefer this over general blockchain explorers when you need a simple filtered feed of big-money movements without parsing raw block data.

## Known failure modes

- Unsupported chain value returns an error (only 'ethereum' and 'base' are valid)
- Very low minValue thresholds may return large result sets or be rejected
- No transactions found matching criteria returns empty list
- Payment failure (402) if USDC balance is insufficient
- Timeout if the chain is experiencing high load

## How this service works

Track large on-chain whale transactions

## Output

A list of large on-chain transactions matching the specified chain and minimum value threshold, including details about each whale movement such as transaction value and relevant addresses.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "chain": {
   "type": "string",
   "description": "Blockchain: 'ethereum' or 'base' (default: ethereum)"
  },
  "minValue": {
   "type": "number",
   "description": "Minimum transaction value in ETH (default: 100)"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/whale-alert-api-klymax402-com-14db5d3f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from whale-alert.api.klymax402.com](https://www.zero.xyz/host/whale-alert.api.klymax402.com/llms.txt)