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SYNTHORA Whale Alert
x402
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.
Price / call$0.002
Success—
StatusUnknown
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.
Example use cases
DeFi token whale watch
“Is there any whale activity happening right now for the token 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base? Flag transfers above $100,000.”
Wallet large-transfer check
“Check if wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Base has made any large transfers above $25,000 recently.”
Pre-trade whale signal scan
“Before I buy this token 0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb on Base, can you check if there's been any whale activity with transfers over $200,000?”
Technical details
Endpoint
POSThttps://whale-alert.hergertsynthora.com/serviceWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| token | string | |
| wallet | string | |
| min_usd | number |
Output
Schema · Response
{
"type": "json",
"example": {
"verdict": "WHALE ACTIVITY",
"top_transfers_count": 10
}
}Tags
x402
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