# Shoal Radar By Category

> Shoal Radar By Category is a paid API for AI agents from api.shoal.xyz, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-10).

Retrieve radar data entries filtered by a specific category via pay-per-request access.

## Facts

- Endpoint: GET https://api.shoal.xyz/v1/radar/byCategory?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/shoal-radar-by-category-9e52254b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_exghRF9bId_Od87Is3eIZ

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-radar-by-category-9e52254b
```

Example prompt: Can you pull the radar data for the 'DeFi' category from Shoal and show me what's listed?

## When to prefer this

Use this endpoint when you need to retrieve radar entries filtered by a specific category from the Shoal platform and are operating in a pay-per-request model without needing a traditional API key. Prefer it when working with x402-compatible payment flows and need categorized radar data quickly.

## Known failure modes

- Payment not provided or insufficient — HTTP 402 returned, request not fulfilled
- Invalid or unsupported category value — returns empty data array or error
- Malformed query parameters — server returns 400 bad request
- Network timeout or server unavailability — connection error
- No results for the given category — returns {"data": []}

## How this service works

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

## Output

Returns a JSON object with a 'data' array containing radar records that match the requested category. The array may be empty if no entries exist for that category.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/shoal-radar-by-category-9e52254b/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)