# M2M Sentinel Whale Signals

> M2M Sentinel Whale Signals is a paid API for AI agents from api.m2msentinel.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Returns observations of large ERC-20 token transfers (whale movements) on the Base blockchain

## Facts

- Endpoint: GET https://api.m2msentinel.com/v1/whales/signals
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/m2m-sentinel-whale-signals-fb312d9b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0kgawe68jm_oq58nVT-dy

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 m2m-sentinel-whale-signals-fb312d9b
```

Example prompt: Pull the latest whale signals from M2M Sentinel — I want to see any large ERC-20 transfers that have been detected on Base right now.

## When to prefer this

Choose this endpoint when you need real-time or near-real-time observations of large ERC-20 token transfers specifically on the Base blockchain. It is purpose-built for whale signal detection on Base, making it superior to generic blockchain explorers or multi-chain analytics APIs when Base-specific whale activity is the focus. Prefer this over DEX volume or price feeds when the primary concern is large wallet movements rather than market liquidity or pricing.

## Known failure modes

- Payment not included or invalid — 402 Payment Required response
- Rate limit exceeded — too many calls in a short window
- No signals currently available — empty signals array returned with SUCCESS status
- Network or upstream Base node unavailability — 503 or timeout
- Malformed query parameters — 400 Bad Request

## How this service works

Who is moving size on Base right now: large ERC-20 transfers reported as observed facts with amounts and source, not as trade signals or predictions.

## Output

Returns an array of whale signal objects representing observed large ERC-20 transfers on the Base network, with a SUCCESS status indicator. Each signal likely includes details such as token address, transfer amounts, sender/receiver addresses, and timestamps of the detected large transfers.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "status"
     ],
     "properties": {
      "status": {
       "type": "string",
       "const": "SUCCESS"
      },
      "signals": {
       "type": "array"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/m2m-sentinel-whale-signals-fb312d9b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.m2msentinel.com](https://www.zero.xyz/host/api.m2msentinel.com/llms.txt)