Whale Watch

Monitor large cryptocurrency transactions

Scan Ethereum for large transactions (whale movements) and get webhook alerts when significant ETH or ERC-20 transfers occur. Decoded payloads with clear, actionable data.

10¢ to arm 5¢ per alert ERC-20 decoded
Get 5 free alerts
How it works

The Whale Watch process

  1. You set a threshold for ETH or ERC-20 transaction value
  2. We scan every 10 minutes using eth_getLogs on Ethereum
  3. We decode the transaction data to extract token transfers and values
  4. If value exceeds threshold, we prepare an alert with decoded details
  5. We send a webhook with the full decoded payload to your endpoint
  6. You're charged only when we successfully deliver an alert
Use cases

Who uses Whale Watch

DeFi Trading

Monitor large token movements that could signal market shifts or upcoming volatility.

Portfolio Protection

Get alerts when large holders move your tokens to exchanges, indicating potential sell pressure.

Arbitrage Opportunities

Detect large exchange deposits/withdrawals that often precede price movements.

Research & Analysis

Study whale behavior patterns to understand market dynamics and accumulation/distribution phases.

Example webhook payload

What you'll receive

webhook payload
{
  "address": "0x742d35Cc6634C0532925a3b8D4C0532950532950",
  "timestamp": "2026-10-16T14:30:00Z",
  "transaction_hash": "0xa1b2c3d4e5f6789012345678901234567890abcdef1234567890abcdef123456",
  "token": "USDC",
  "token_address": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
  "from": "0x742d35Cc6634C0532925a3b8D4C0532950532950",
  "to": "0x8Ba1f109551bD432803012645hac136c22c501esi",
  "value": "1250000",
  "decimals": 6,
  "formatted_value": "1250.00",
  "transaction_type": "ERC20_TRANSFER"
}
Trust & transparency

Verifiable alerts

Every Whale Watch alert is recorded on a public ledger accessible at /ticker. This provides transparent, verifiable usage tracking without requiring accounts or personal information.