# P0 Agent Economy Index – URL Uptime Ping

> P0 Agent Economy Index – URL Uptime Ping is a paid API for AI agents from x402-bazaar-rank.x402-bazaar-rank-worker.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-22).

Checks whether a given public HTTP/HTTPS URL is reachable by performing a HEAD (or GET fallback) request from a Cloudflare edge node and returning status, latency, TLS, and redirect details.

## Facts

- Endpoint: GET https://x402-bazaar-rank.x402-bazaar-rank-worker.workers.dev/v1/uptime/ping?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/p0-agent-economy-index-url-uptime-ping-0dc05ab9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4E41rNEiok3xQF2ImIjgY

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 p0-agent-economy-index-url-uptime-ping-0dc05ab9
```

Example prompt: Can you check if https://example.com/ is up right now — whether it returns a 200, how fast it responds, and whether TLS is enabled?

## When to prefer this

Use this endpoint when you need a fast, single-shot reachability check on any public HTTP/HTTPS URL — especially before making downstream API calls, verifying deployed services, or confirming redirect chains. It is a lightweight probe, not a full uptime-history or multi-region monitoring service; prefer it over general-purpose HTTP clients when you want edge-location latency measurement, automatic HEAD→GET fallback, and structured TLS/redirect metadata in one call.

## Known failure modes

- URL is unreachable or times out — ok: false with error_detail
- URL redirects more than 4 times — redirect loop reported as ok: false
- Non-standard ports (not 80, 443, 8080, 8443) may be blocked
- Bad or missing Location header in redirect chain — ok: false
- TLS handshake errors reported as ok: false
- 4xx/5xx from target server — ok: false; HEAD retried as GET automatically

## How this service works

An open index of the machine-to-machine (agent) economy. x402 routes: ranked discovery over the live x402 service market, every indexed service scored by real 30-day calls and paying-wallet bounds, with a receipt naming the snapshot hash and scoring revision. /economy routes, for Tempo MPP, Virtuals ACP, Olas, Masumi, ERC-8004 agent registries, Solana agent registries, Base agent contracts and MCP servers (Official MCP Registry): each protocol's published figures (agent or server counts, transactions or payment events; payers and USD volume only where the source publishes them: payers for x402 and Tempo MPP, USD volume for x402 and Virtuals ACP), each with its unit, window and source; units differ, so totals are not summed. L402 and per-service MPP listings are not covered.

## Output

A JSON object indicating whether the URL returned a successful response (ok: true/false), the HTTP status code, latency to response headers in milliseconds, TLS status, the final URL after any redirects, the full redirect chain, the server header, content-type, the edge location that performed the check, and a timestamp. Errors (timeouts, refused connections) are reported with ok: false and an error_detail field.

## 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",
      "HEAD"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "url"
     ],
     "properties": {
      "url": {
       "type": "string",
       "maxLength": 2048,
       "description": "public http or https URL to check, e.g. https://example.com/ (ports 80, 443, 8080, 8443)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "url",
      "final_url",
      "ok",
      "status",
      "latency_ms",
      "redirects",
      "tls",
      "checked_at",
      "checked_from",
      "note"
     ],
     "properties": {
      "ok": {
       "type": "boolean",
       "description": "true when the final response was 2xx, or 3xx with no further redirect; false on error or a stopped redirect"
      },
      "tls": {
       "type": "boolean",
       "description": "true when final_url is https"
      },
      "url": {
       "type": "string",
       "description": "The URL checked, as normalized"
      },
      "note": {
       "type": "string",
       "description": "Fixed text on what one check does and does not prove"
      },
      "error": {
       "type": [
        "string",
        "null"
       ],
       "description": "null, or: timeout, connection refused, dns error, tls error, connection reset, network error, dns: name does not exist"
      },
      "method": {
       "type": [
        "string",
        "null"
       ],
       "description": "Method of the final request: HEAD, or GET when HEAD answered 4xx/5xx; null when no request was made"
      },
      "server": {
       "type": [
        "string",
        "null"
       ],
       "description": "Server header of the final response (max 200 chars); null when absent or no response"
      },
      "status": {
       "type": [
        "integer",
        "null"
       ],
       "description": "HTTP status of the final response; null when no response arrived"
      },
      "total_ms": {
       "type": [
        "integ
… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "tls": true,
  "url": "https://example.com/",
  "note": "Format sample with round illustrative placeholder numbers, not a live measurement. One check from one Cloudflare edge location at checked_at: HEAD, repeated as GET (body capped at 8 KB) if HEAD answered 4xx/5xx; redirects followed manually up to 4. ok means the final response was 2xx, or 3xx without a further redirect; a redirect that was not followed (loop, bad Location, blocked target) is ok:false. It does not prove the page content is correct, that the site is reachable from other networks, or anything about uptime history. latency_ms is time to response headers of the final request; TLS certificate details are not inspected. Timeouts and refused connections are reported as ok:false.",
  "error": null,
  "method": "HEAD",
  "server": "cloudflare",
  "status": 200,
  "total_ms": 200,
  "final_url": "https://example.com/",
  "redirects": 0,
  "checked_at": "2026-10-06T00:00:00.000Z",
  "latency_ms": 100,
  "head_status": null,
  "checked_from": "Cloudflare edge",
  "content_type": "text/html; charset=utf-8",
  "error_detail": null,
  "redirect_chain": [],
  "redirect_stopped": null
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/p0-agent-economy-index-url-uptime-ping-0dc05ab9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-bazaar-rank.x402-bazaar-rank-worker.workers.dev](https://www.zero.xyz/host/x402-bazaar-rank.x402-bazaar-rank-worker.workers.dev/llms.txt)