How to Track Crypto Whale Transactions Across 9 Blockchains with Python

#api #crypto #python #tutorial

Why Whale Tracking Matters

When a whale moves $50M of ETH, the market notices. Learning to detect these movements before the price reacts gives you an edge.

Current Market: Fear & Greed Index at 28/100 (Fear)

Bitcoin ($64,625.44) 📈 +1.1%
Ethereum ($1,867.74) 📈 +1.2%
Tether ($1.00) 📈 +0.0%
BNB ($568.51) 📈 +0.2%
USDC ($1.00) 📈 +0.0%

What the API Provides

The ChainSight API tracks whale transactions across 9 blockchains:

Chain	Source	Min Trackable
Ethereum	Etherscan V2	100 ETH
Bitcoin	Blockstream Mempool	1 BTC
BSC	Etherscan V2	1000 BNB
Polygon	Etherscan V2	10000 MATIC
Arbitrum, Base, OP, Avalanche	Etherscan V2	Varies
Solana	Solscan API	100 SOL

Quick Start

import httpx

API = "https://chainsight-api.onrender.com"

# Get large ETH transactions
resp = httpx.get(f"{API}/v1/whales/chain/ethereum", params={"min_value": 100000})
for tx in resp.json():
    if "hash" in tx:
        print(f"🐋 {tx['value']} ETH — {tx['from_address'][:12]}...")

Build a Whale Alert Bot

import httpx, asyncio

API = "https://chainsight-api.onrender.com"

async def monitor():
    last_hash = ""
    while True:
        resp = httpx.get(f"{API}/v1/whales/chain/ethereum?min_value=500000")
        txs = resp.json()
        for tx in txs:
            if tx.get("hash") and tx["hash"] != last_hash:
                print(f"🚨 WHALE: {tx['value']} ETH moved!")
                last_hash = tx["hash"]
        await asyncio.sleep(60)

asyncio.run(monitor())

What You Can Build

Trading bots that react to whale movements
Portfolio alerts when large wallets move
Research dashboards tracking smart money
Risk management tools detecting exchange outflows

Try It Free

The API offers a free tier with no credit card:

curl "https://chainsight-api.onrender.com/v1/whales/chain/ethereum?min_value=100000"

🔗 RapidAPI | 🔗 GitHub

ChainSight is open source and free. Built by a solo developer.

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