# Klymax402 Whale Alert — Large On-Chain Transaction Monitor

> Klymax402 Whale Alert — Large On-Chain Transaction Monitor is a paid API for AI agents from klymax402.com, paid per call via x402, $0.008/call, status unknown (last checked 2026-09-14).

Fetches large on-chain transactions (whale movements) on Ethereum or Base blockchain above a configurable ETH value threshold

## Facts

- Endpoint: GET https://klymax402.com/api/whale-alert/api/whales
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/klymax402-whale-alert-large-on-chain-transaction-monitor-93ef93e8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_aZ_B1f7IBuPB587mKY_RT

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 klymax402-whale-alert-large-on-chain-transaction-monitor-93ef93e8
```

Example prompt: Show me the latest whale transactions on Ethereum where the transfer value is at least 500 ETH — I want to see how many big moves happened recently and what blocks were scanned.

## When to prefer this

Use this endpoint when you need near-real-time on-chain data about large ETH transfers on Ethereum or Base without managing your own blockchain node or subscribing to a dedicated whale-tracking service. It is a good fit for lightweight market intelligence, DeFi flow monitoring, or triggering downstream logic when whale activity is detected. If you need historical data, multi-chain coverage beyond Ethereum/Base, or real-time streaming alerts, a dedicated whale analytics platform may be more appropriate.

## Known failure modes

- Invalid chain value (not 'ethereum' or 'base') may return an error or default behavior
- minValue set too high may return empty transactions array with whaleCount of 0
- Payment failure (insufficient USDC or bad x402 header) results in 402 response
- Network timeouts if the blockchain node is slow or overloaded
- Empty result set during low-activity periods on Base chain

## How this service works

One MCP endpoint gives your AI agent access to 100 APIs -- crypto, DeFi, web, AI, finance and utilities. No API keys, USDC on Base from $0.003/call.

## Output

Returns a JSON object with: the chain scanned, a timestamp, total whale transaction count, the latest block number, the ETH minimum threshold applied, number of blocks scanned, and an array of individual large transactions meeting the criteria.

## 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)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "chain": "example",
  "timestamp": "example",
  "whaleCount": 1,
  "latestBlock": 1,
  "minValueEth": 1,
  "transactions": [],
  "blocksScanned": 1
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/klymax402-whale-alert-large-on-chain-transaction-monitor-93ef93e8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from klymax402.com](https://www.zero.xyz/host/klymax402.com/llms.txt)