# SYNTHORA Whale Alert

> SYNTHORA Whale Alert is a paid API for AI agents from whale-alert.hergertsynthora.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-13).

Detects and reports large on-chain transfers (whale activity) for any token or wallet on Base, returning a verdict and top transfer count per call.

## Facts

- Endpoint: POST https://whale-alert.hergertsynthora.com/service
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synthora-whale-alert-b0baa1e4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_W3RUj1qmZv48SipHh5b0C

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 synthora-whale-alert-b0baa1e4 -d '<json body>'
```

Example prompt: Check for whale activity on Base for the token 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 and flag any transfers above $50,000.

## When to prefer this

Choose this endpoint when you need a single, on-demand per-call whale alert for Base network tokens or wallets without committing to a subscription. Ideal for autonomous agents that need to check whale activity conditionally as part of a workflow rather than on a continuous basis. Prefer this over subscription-based whale alert services when cost efficiency per query matters or when checks are sporadic rather than continuous.

## Known failure modes

- Invalid or malformed token/wallet address returns an error
- No whale activity found returns a benign verdict with zero transfer count
- Network issues with Base RPC may cause timeouts
- min_usd threshold set too low may return large result sets or be rejected
- Missing both token and wallet fields may result in a validation error

## How this service works

Per-call whale and large-transfer alerts for any token or wallet on Base, keyless. Returns the biggest recent ERC-20 transfers plus a WHALE ACTIVITY / MODERATE / QUIET verdict. Unlike Nansen, Arkham or Whale Alert which are subscription-only, autonomous agents can buy this per-call with a wallet. Agent-to-agent smart-money monitoring for A2A trading and risk systems.

## Output

Returns a JSON object with a 'verdict' field (e.g. 'WHALE ACTIVITY') indicating whether large transfers were detected, and 'top_transfers_count' showing how many significant transfers were found meeting the threshold criteria.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "token": {
   "type": "string"
  },
  "wallet": {
   "type": "string"
  },
  "min_usd": {
   "type": "number"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "verdict": "WHALE ACTIVITY",
  "top_transfers_count": 10
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synthora-whale-alert-b0baa1e4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from whale-alert.hergertsynthora.com](https://www.zero.xyz/host/whale-alert.hergertsynthora.com/llms.txt)