# HTTPay Whale Alert API

> HTTPay Whale Alert API is a paid API for AI agents from httpay.xyz, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).

Returns recent large on-chain transactions (whale movements) via a pay-per-call endpoint using x402 micropayments on Base

## Facts

- Endpoint: POST https://httpay.xyz/api/whale-alert
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/httpay-whale-alert-api-b5473f2d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nw0Q8Ifbn_b8ttTgvrPFH

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-api-b5473f2d -d '<json body>'
```

Example prompt: Can you pull up the most recent large on-chain transactions — I want to see what whales have been moving lately?

## When to prefer this

Use this endpoint when you need a no-API-key, pay-as-you-go solution for fetching recent large on-chain transaction data, especially when you want to avoid subscription commitments and only pay $0.005 per call via USDC micropayments on Base via the x402 protocol.

## Known failure modes

- Payment not included or insufficient USDC — returns HTTP 402 Payment Required
- Invalid x402 payment header format — returns 400 Bad Request
- No recent whale transactions available — returns empty list or placeholder simulated data
- Network congestion on Base causing payment verification delay — possible timeout
- Rate limit exceeded — returns 429 Too Many Requests

## How this service works

Recent large transactions (simulated)

## Output

A JSON object containing a list of recent large on-chain transactions (simulated), including details about transaction amounts, involved wallets or tokens, and other relevant metadata about whale-level movements.

## Example request

```json
{
 "limit": 10,
 "min_value": 100000
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "description": "Recent large transactions (simulated)"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/httpay-whale-alert-api-b5473f2d/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)