# Riley Craig x402 Agent Store — /signal (AI Visibility Signal Feed)

> Riley Craig x402 Agent Store — /signal (AI Visibility Signal Feed) is a paid API for AI agents from x402-agent-store.rileycraig14.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).

Returns aggregated AI-visibility signals showing which brands and categories AI agents are recently querying or surfacing, with counts and recency data.

## Facts

- Endpoint: GET https://x402-agent-store.rileycraig14.workers.dev/signal
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/riley-craig-x402-agent-store-signal-ai-visibility-signal-feed-eb175fb1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Z9P-O0rtC7-Ne6D_ZZPvi

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 riley-craig-x402-agent-store-signal-ai-visibility-signal-feed-eb175fb1
```

Example prompt: What brands and product categories are AI agents surfacing the most right now? Pull the latest signal data from the x402 agent store so I can see the top brands and categories with their recent query counts.

## When to prefer this

Choose this endpoint when you need real-time aggregated intelligence about which brands and product categories AI agents are most actively querying or surfacing — useful for competitive intelligence, AI-era brand tracking, or understanding what the AI agent ecosystem is paying attention to. Prefer over generic web search when you specifically want AI-agent-centric signal data rather than general web traffic or social trends.

## Known failure modes

- Payment not included or insufficient USDC — returns HTTP 402 requiring x402 payment on Base
- Invalid properties filter format — may return empty or malformed results
- No signals available yet — returns total: 0 with empty arrays
- Worker timeout or upstream failure — returns 5xx error

## How this service works

Live, time-stamped feed of which brands and product categories are being checked for AI-search visibility right now (US/EU markets), with trending brands and categories. Real usage data, not synthetic.

## Output

A JSON object with a total count of signals, an array of recent signal events (each with a timestamp, brand name, market, and category), a ranked list of top brands by signal count, and a ranked list of top categories by signal count.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "total": 7,
  "recent": [
   {
    "at": 1781044040644,
    "brand": "Notion",
    "market": "us",
    "category": "project management software"
   }
  ],
  "top_brands": [
   {
    "name": "Notion",
    "count": 2
   }
  ],
  "top_categories": [
   {
    "name": "project management software",
    "count": 2
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/riley-craig-x402-agent-store-signal-ai-visibility-signal-feed-eb175fb1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-agent-store.rileycraig14.workers.dev](https://www.zero.xyz/host/x402-agent-store.rileycraig14.workers.dev/llms.txt)