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Silverback Whale Movement Monitor
x402
Silverback Whale Movement Monitor is a paid API for AI agents from silverback-x402.onrender.com, paid per call via x402, $0.02/call, status down (last checked 2026-09-15).
Tracks large on-chain token transfers, buys, and sells above a USD threshold, returning a ranked list of whale moves with summary analytics
Price / call$0.02
Success—
StatusDown
How this service works
Monitor whale movements including buys, sells, and transfers for any token
Output
Returns a list of up to 50 whale transactions including sender, receiver, move type (buy/sell/transfer), token symbol, raw value, USD value, transaction hash, block number, and timestamp. Also includes a summary with total move count, net flow, top buyers, top sellers, and the single largest move.
Example use cases
Example prompt
“Show me the top 10 whale moves for USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base chain with a minimum transaction size of $500,000 — I want to see who's buying, selling, and moving big amounts.”
Technical details
Endpoint
GEThttps://silverback-x402.onrender.com/api/v1/whale-movesWhen to prefer
Use this endpoint when you need real-time whale activity intelligence for a specific ERC-20 token on Base (or other EVM chains), particularly when you want to identify large holders moving funds, detect buy/sell pressure from big wallets, or understand net flow dynamics. Prefer this over generic block explorers when you need structured, filterable, USD-denominated whale data with summary analytics in a single call.
Side effects
- Invalid token contract address returns error or empty moves array
- Unsupported chain ID may return no results
- minValueUsd set too high may return zero moves
- limit exceeding 50 is clamped or rejected
- Payment failure via x402 returns 402 before data is served
- Rate limiting or cold start on Render free tier causes timeout
Input
{
"limit": 10,
"token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"chainId": 8453,
"minValueUsd": 500000
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| limit | number | Number of results (default: 10, max: 50) |
| token | string | Token contract address (optional - ETH if not provided) |
| chainId | number | Chain ID (default: 8453 for Base) |
| minValueUsd | number | Minimum USD value to track (default: 100000) |
Output
{
"data": {
"moves": [],
"token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"chainId": 8453,
"summary": {
"netFlow": 0,
"topBuyers": [],
"topSellers": [],
"totalMoves": 0,
"largestMove": null
}
},
"success": true
}Tags
x402
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