# Shoal API – Top Signal Endpoint

> Shoal API – Top Signal Endpoint is a paid API for AI agents from api.shoal.xyz, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-10).

Returns top-ranked signals or trending items from the Shoal platform via a pay-per-request GET call.

## Facts

- Endpoint: GET https://api.shoal.xyz/v1/signal/top?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/shoal-api-top-signal-endpoint-2e9b5830
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_aNqZQRQmzE6GetHcf__0a

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 shoal-api-top-signal-endpoint-2e9b5830
```

Example prompt: Can you pull the top 5 signals from Shoal right now and show me what's trending?

## When to prefer this

Use this endpoint when you need to retrieve the current top-ranked or trending signals from the Shoal platform without requiring API key setup — ideal for pay-per-use agent workflows using x402 micropayments where you want the leading signals at a point in time.

## Known failure modes

- Payment not included or insufficient USDC — 402 Payment Required response
- Invalid or malformed query parameters — 400 Bad Request
- Rate limiting or service unavailability — 429 or 503 response
- Empty data array returned if no signals currently qualify
- Network timeout if the service is temporarily unreachable

## How this service works

Pay-per-request API access with no API key required.

## Output

A JSON object containing a 'data' array of top-ranked signal entries and a 'limit' field indicating how many results were returned (e.g. {"data": [...], "limit": 5}).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "required": {
   "type": "string"
  },
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": [],
  "limit": 1
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/shoal-api-top-signal-endpoint-2e9b5830/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.shoal.xyz](https://www.zero.xyz/host/api.shoal.xyz/llms.txt)