const ws = new WebSocket("wss://leviathan.whale-alert.io/ws?api_key=YOUR_API_KEY");

ws.onopen = () => ws.send(JSON.stringify({
  type: "subscribe_alerts",
  blockchains: ["ethereum"],
  symbols: ["cro"],
  min_value_usd: 100000,
}));

ws.onmessage = (event) => {
  const msg = JSON.parse(event.data);
  if (msg.type === "alert") console.log(msg.amounts, msg.from, "→", msg.to);
};

import asyncio, json
from websockets.asyncio.client import connect

async def main():
    url = "wss://leviathan.whale-alert.io/ws?api_key=YOUR_API_KEY"
    async with connect(url) as ws:
        await ws.send(json.dumps({
            "type": "subscribe_alerts",
            "blockchains": ["ethereum"],
            "symbols": ["cro"],
            "min_value_usd": 100000,
        }))
        async for raw in ws:
            msg = json.loads(raw)
            if msg.get("type") == "alert":
                print(msg["amounts"], msg.get("from"), "->", msg.get("to"))

asyncio.run(main())

package main

import (
	"fmt"
	"log"

	"github.com/gorilla/websocket"
)

func main() {
	conn, _, err := websocket.DefaultDialer.Dial("wss://leviathan.whale-alert.io/ws?api_key=YOUR_API_KEY", nil)
	if err != nil {
		log.Fatal(err)
	}
	defer conn.Close()

	err = conn.WriteJSON(map[string]any{
		"type":          "subscribe_alerts",
		"blockchains":   []string{"ethereum"},
		"symbols":       []string{"cro"},
		"min_value_usd": 100000,
	})
	if err != nil {
		log.Fatal(err)
	}

	for {
		var msg struct {
			Type    string `json:"type"`
			From    string `json:"from"`
			To      string `json:"to"`
			Amounts []struct {
				Symbol string  `json:"symbol"`
				Amount float64 `json:"amount"`
			} `json:"amounts"`
		}
		if err := conn.ReadJSON(&msg); err != nil {
			log.Fatal(err)
		}
		if msg.Type == "alert" {
			fmt.Println(msg.Amounts, msg.From, "->", msg.To)
		}
	}
}

{
  "type": "alert",
  "blockchain": "bitcoin",
  "transaction_type": "transfer",
  "to": "Coinbase",
  "amounts": [{ "symbol": "btc", "amount": 1500, "value_usd": 98512350 }],
  "transaction": { "hash": "7c3f9a1e…6be91a", "height": 970412 },
  "timestamp": 1791900127
}