# HTTPay Top Signal API

> HTTPay Top Signal API is a paid API for AI agents from httpay.xyz, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Checks whether a crypto market or token has reached a top, providing a market sentiment or cycle-peak signal

## Facts

- Endpoint: POST https://httpay.xyz/api/top-signal
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/httpay-top-signal-api-c5e49244
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_e8DKVCv7WLVpTj1MwZcxU

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-top-signal-api-c5e49244 -d '<json body>'
```

Example prompt: Has the crypto market hit a top right now? Check the top signal and tell me if we're at or near a cycle peak.

## When to prefer this

Use this endpoint when you need a quick, pay-per-call market cycle top signal without managing API keys or subscriptions. Ideal for AI agents that want to programmatically check if a crypto market has peaked, paid atomically via USDC on Base via the x402 protocol.

## Known failure modes

- Payment not received — returns 402 with x402 payment required header
- USDC balance insufficient for $0.003 per call
- Network unavailable or Base chain connectivity issues — 503 or timeout
- Malformed response if underlying data source is unavailable

## How this service works

Check if we've hit the top

## Output

Returns a JSON object with a description field indicating whether the market has reached a top, likely including a boolean or qualitative signal about cycle peak status.

## Example request

```json
{}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "description": "Check if we've hit the top"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/httpay-top-signal-api-c5e49244/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)