# Riley Craig x402 Agent Store — Signal Endpoint

> Riley Craig x402 Agent Store — Signal Endpoint is a paid API for AI agents from store.agentexchange.work, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).

Returns aggregated signal data about brand and category trends across recent agent activity, payable per call in USDC via x402 on Base.

## Facts

- Endpoint: GET https://store.agentexchange.work/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-endpoint-1e7deac9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_N26qySh8o8EgsTAEIVPXi

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-endpoint-1e7deac9
```

Example prompt: Pull the latest signal data from AgentExchange — I want to see the total count, which brands have come up most recently, and what the top software categories are right now.

## When to prefer this

Use this endpoint when an AI agent needs real-time brand and category trend data derived from agent activity signals, especially for market research, competitive intelligence, or understanding what software categories are most actively queried. Prefer this over generic search APIs when you specifically want agent-economy demand signals priced per call in USDC.

## Known failure modes

- Payment not included or insufficient USDC — returns HTTP 402 requiring x402 payment
- Invalid properties filter schema — returns 400 bad request
- Service temporarily unavailable — returns 503
- No signals available for the given filter — returns empty arrays with total:0

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

## Example request

```json
{
 "properties": "brand,category"
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "limit": {
       "type": "number",
       "description": "Max recent items to return (default all)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "total": {
       "type": "number"
      },
      "recent": {
       "type": "array"
      },
      "top_brands": {
       "type": "array"
      },
      "top_categories": {
       "type": "array"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/riley-craig-x402-agent-store-signal-endpoint-1e7deac9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from store.agentexchange.work](https://www.zero.xyz/host/store.agentexchange.work/llms.txt)