# x402 Prober Census – Bazaar Listing Monitor & Crawler Index

> x402 Prober Census – Bazaar Listing Monitor & Crawler Index is a paid API for AI agents from store-production-8add.up.railway.app, paid per call via x402, $0.25/call, status unknown (last checked 2026-10-22).

Returns a weekly-updated census of automated x402 monitors and index crawlers observed polling a Bazaar listing on Base mainnet, including their user-agent, operator, class, and quote counts.

## Facts

- Endpoint: GET https://store-production-8add.up.railway.app/v1/probers?utm_source=zero.xyz
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-prober-census-bazaar-listing-monitor-crawler-index-cbb00f3c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fMPDEaNhF5ws3AK8I8k6p

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 x402-prober-census-bazaar-listing-monitor-crawler-index-cbb00f3c
```

Example prompt: Pull the latest weekly census of x402 probers and crawlers that have been polling my Bazaar listing — I want to see each one's user-agent prefix, operator URL, class (monitor or crawler), and how many 402 quotes they were served.

## When to prefer this

Use this endpoint when you need to audit or understand the automated ecosystem polling an x402-protected Bazaar listing on Base mainnet — specifically when you want structured, named, classified records of monitors vs. crawlers with operator provenance and activity metrics, rather than raw server logs or generic traffic analytics.

## Known failure modes

- No probers observed in the window — returns count:0 and empty probers array
- Payment not completed — x402 402 response requiring $0.25 USDC before data is returned
- Stale data if logs have not yet been processed for the current week
- Upstream log pipeline failure causing delayed or missing weekly update

## How this service works

Census of automated x402 monitors and index crawlers observed polling a Bazaar listing on Base mainnet: user-agent prefix, operator URL, stated purpose, class (monitor or crawler), quotes served in the observation week. Updated weekly from live terminal logs.

## Output

A JSON object containing the observation window start and end dates (ISO format), a count of distinct named probers, and an array of prober records. Each record includes the prober's name, user-agent match prefix, class (monitor or crawler), operator URL (if provided), stated purpose, number of 402 quotes served, and number of distinct days seen during the week.

## 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": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "observedFrom",
      "observedTo",
      "count",
      "probers"
     ],
     "properties": {
      "count": {
       "type": "integer",
       "description": "Number of distinct named probers"
      },
      "probers": {
       "type": "array",
       "items": {
        "type": "object",
        "properties": {
         "days": {
          "type": "integer",
          "description": "Distinct days seen in the window"
         },
         "name": {
          "type": "string"
         },
         "class": {
          "type": "string",
          "description": "monitor (reads the price, never pays) or crawler (index or search)"
         },
         "match": {
          "type": "string",
          "description": "User-agent prefix that identifies the prober"
         },
         "quotes": {
          "type": "integer",
          "description": "402s served to this prober in the window"
         },
         "purpose": {
          "type": [
           "string",
           "null"
          ],
          "description": "What the user-agent string says about itself"
         },
         "operator": {
          "type": [
           "string",
           "null"
          ],
          "description": "Operator URL from the user-agent string, if given"
         }
        }
       }
      },
      "observedTo": {
       "type": "string",
       "description": "Last day of the observation window, ISO date"
      },
      "observedFrom": {
       "type": "string",
       "description": "First day of the observation window, ISO date"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-prober-census-bazaar-listing-monitor-crawler-index-cbb00f3c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from store-production-8add.up.railway.app](https://www.zero.xyz/host/store-production-8add.up.railway.app/llms.txt)