# x402-quickstart Agent Market Probe (loop2)

> x402-quickstart Agent Market Probe (loop2) is a paid API for AI agents from loop2-quickstart.manhliemcn4euwlu.workers.dev, paid per call via x402, $0.001/call, status down (last checked 2026-10-14).

Returns a probe/health-check bundle for x402-compliant agent market endpoints, reporting reachability, HTTP conformance, payment routing, and pricing for v2 Base USDC seller endpoints.

## Facts

- Endpoint: GET https://loop2-quickstart.manhliemcn4euwlu.workers.dev/mkt/agents?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: down
- Last checked: 2026-10-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-quickstart-agent-market-probe-loop2-94037fbb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Ry4xbatNFTmPKLL2ZBOH0

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-quickstart-agent-market-probe-loop2-94037fbb
```

Example prompt: Can you probe the x402 agent market endpoint and give me a conformance report — I want to know if it's reachable, whether it returns a proper 402, what the pay-to address is, and the USDC amount in atomic units? Use JSON format for the output.

## When to prefer this

Choose this endpoint when you need a lightweight, structured conformance audit of an x402 v2 seller on Base USDC — especially when you want a single call that returns reachability, 402-response validity, pay-to address, and atomic pricing in one bundle. Prefer it over generic HTTP health checks when the target is specifically an x402-gated micropayment API and you need EIP-3009-aware validation.

## Known failure modes

- Endpoint unreachable — worker may be down or cold-starting, probe returns reachable=false
- Non-conformant 402 response — seller misconfigured, x402_402 probe fails
- Missing or malformed pay-to address — EIP-3009 fields absent in 402 header
- Format query param missing — request rejected as invalid input
- Payment not processed — probe is read-only and does not settle payments, financial data may be stale

## How this service works

Complete x402 quickstart bundle: v2 Base USDC seller endpoint + EIP-3009 buyer client + deterministic product bundle + tests.

## Output

Returns a binary/JSON probe bundle containing per-check results for: URL reachability, HTTP status, x402 402-response presence, protocol conformance, pay-to address, atomic payment amount, and aggregate stats across all probes.

## 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",
      "DELETE"
     ],
     "type": "string"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    },
    "queryParams": {
     "type": "object",
     "required": [
      "format"
     ],
     "properties": {
      "format": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "format": {
     "type": "string"
    },
    "example": {
     "type": "string"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "binary",
 "example": "{probes:[url,reachable,http,x402_402,conformant,pay_to,amount_atomic], stats}"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-quickstart-agent-market-probe-loop2-94037fbb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from loop2-quickstart.manhliemcn4euwlu.workers.dev](https://www.zero.xyz/host/loop2-quickstart.manhliemcn4euwlu.workers.dev/llms.txt)