# HTTPay Whale Alert Base

> HTTPay Whale Alert Base is a paid API for AI agents from httpay.xyz, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Returns the latest large on-chain transactions (>$10K) on Base in the last hour, focusing on USDC and WETH transfers sourced from BaseScan.

## Facts

- Endpoint: POST https://httpay.xyz/api/whale-alert-base
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/httpay-whale-alert-base-45529b32
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6KoywfWZmcWLnE3WnaI_z

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 httpay-whale-alert-base-45529b32 -d '<json body>'
```

Example prompt: Show me the latest whale transactions on Base — I want to see any USDC or WETH transfers over $10K from the past hour.

## When to prefer this

Use this endpoint when you need a quick, real-time snapshot of whale activity (>$10K transfers) on the Base network without setting up API keys or subscriptions. Ideal for DeFi monitoring agents, trading bots, or market sentiment tools that need on-chain large-transaction signals on Base specifically.

## Known failure modes

- No large transactions found in the last hour — returns empty list or descriptive message
- BaseScan data unavailable — may return stale or error response
- Payment not completed — 402 response requiring x402 USDC payment on Base
- Rate limiting or server errors — 5xx response

## How this service works

Latest large transactions on Base (>$10K) in the last hour. Real on-chain USDC/WETH transfer data via BaseScan.

## Output

A JSON object containing a list of large on-chain transactions on Base from the past hour, including transfer amounts, token types (USDC/WETH), sender and receiver addresses, and timestamps, sourced from BaseScan.

## Example request

```json
{
 "chain": "base",
 "limit": 10
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "description": "Latest large transactions on Base (>$10K) in the last hour. Real on-chain USDC/WETH transfer data via BaseScan."
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/httpay-whale-alert-base-45529b32/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from httpay.xyz](https://www.zero.xyz/host/httpay.xyz/llms.txt)