# Whale Transfers

> Whale Transfers is a paid API for AI agents from bess-x402.onrender.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-29).

Returns the largest recent ERC-20 token transfers (whale alerts) on EVM chains, including sender, receiver, amount, and mint/burn flag.

## Facts

- Endpoint: GET https://bess-x402.onrender.com/v1/crypto/whale-transfers?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/whale-transfers-c8c3ab12
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xzySIlarq9tf894Q6JAgJ

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 whale-transfers-c8c3ab12
```

Example prompt: Show me the largest USDC transfers over $1M on Ethereum from the last 500 blocks — I want to see sender, receiver, and amount for any whale movements.

## When to prefer this

Choose this endpoint when you need real-time on-chain whale activity detection for major stablecoins (USDC, USDT, DAI) or any ERC-20 token across five EVM-compatible chains. It is ideal for agents monitoring large capital flows, detecting mint/burn events, or building DeFi analytics dashboards. Prefer this over general blockchain explorers when you need structured, filtered results by minimum transfer size without writing custom on-chain queries.

## Known failure modes

- Invalid chain name returns an error (accepted: ethereum, base, arbitrum, optimism, polygon)
- Unknown token symbol or invalid contract address returns an error
- blocks parameter out of range (must be 1-2000) returns validation error
- limit parameter out of range (must be 1-100) returns validation error
- No transfers found meeting the minimum amount threshold returns empty results
- Chain RPC unavailability may cause timeout or partial results
- Payment of $0.003 USDC required per call; missing payment returns 402

## How this service works

Whale alerts: the largest recent ERC-20 transfers (default USDC over $1M) in the latest blocks, with sender, receiver, amount and mint/burn flag. Works for USDC, USDT, DAI or any token on 5 EVM chains.

## Output

A list of recent large ERC-20 token transfers on the specified EVM chain, each including sender address, receiver address, transfer amount, token symbol, block number, transaction hash, and a mint/burn flag indicating whether the transfer originated from or went to the zero address.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "chain": {
       "type": "string",
       "description": "ethereum, base, arbitrum, optimism or polygon"
      },
      "limit": {
       "type": "integer",
       "description": "Maximum number of results (1-100)"
      },
      "token": {
       "type": "string",
       "description": "Token address or USDC/USDT/DAI"
      },
      "blocks": {
       "type": "integer",
       "description": "Recent blocks to scan (1-2000)"
      },
      "min_amount": {
       "type": "number",
       "description": "Minimum amount in token units"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/whale-transfers-c8c3ab12/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bess-x402.onrender.com](https://www.zero.xyz/host/bess-x402.onrender.com/llms.txt)