# x402 Catalog Submission Readiness Gate

> x402 Catalog Submission Readiness Gate is a paid API for AI agents from k2so-8080.on.ascii.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-22).

Runs a pass/fail self-audit on an x402 service submission, checking for common rejection causes like missing license, broken 402 challenge, bad price metadata, thin schema, and no smoke test.

## Facts

- Endpoint: GET https://k2so-8080.on.ascii.dev/api/services/x402-catalog-submission-readiness-for-builders-a?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-catalog-submission-readiness-gate-80fdd847
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uFJ9OMJoRJaqHlAiodTwq

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-catalog-submission-readiness-gate-80fdd847
```

Example prompt: Run a readiness audit on my x402 service and tell me exactly what's failing — I want a hard pass/fail verdict with specific fixes for anything that would get it rejected from a catalog.

## When to prefer this

Choose this endpoint when you need a structured, automated pre-flight check before submitting an x402 service to any catalog or bazaar. It is purpose-built for x402 builders who want a blunt machine-readable verdict on common rejection causes (license, 402 response, pricing honesty, schema quality, smoke test) rather than a human-readable marketing guide. Prefer it over generic API linting tools because it encodes x402-specific catalog acceptance criteria.

## Known failure modes

- HTTP 402 returned if payment not included — must pay $0.002 USDC per call
- HTTP 404 if endpoint slug is incorrect
- HTTP 405 if wrong HTTP method used (only GET/HEAD/DELETE accepted)
- Empty or malformed topic param may return generic rather than targeted audit
- LLM-backed verdict may vary slightly between calls if generationSource is 'llm'
- Service may return ok:false with an error detail if the handler fails internally

## How this service works

Pass/fail self-audit for builders submitting an x402 service to a catalog or bazaar. Checks the failure modes that get services rejected or marked weak: missing MIT license file, HTTP 404/405 instead of a real 402 challenge, dishonest or missing price metadata, thin response schema, and no smoke test. Outputs a hard gate verdict with the exact fix for each failed check. Blunt decision procedure, not marketing.

## Output

A structured JSON response containing a hard pass/fail gate verdict, a list of each failed check with the exact remediation step, a prose decision-procedure brief for agents, an ISO-8601 timestamp, and the generation source (llm, reasoning, or deterministic). Also includes payment confirmation metadata.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "x402 catalog submission readiness gate paid response",
     "$schema": "https://json-schema.org/draft/2020-12/schema",
     "required": [
      "ok",
      "paid",
      "service",
      "provider",
      "result"
     ],
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "paid": {
       "type": "boolean"
      },
      "result": {
       "type": "object",
       "required": [
        "ok",
        "service"
       ],
       "properties": {
        "ok": {
         "type": "boolean",
         "description": "Handler success"
        },
        "brief": {
         "type": "string",
         "description": "Decision procedure prose for agents"
        },
        "model": {
         "type": "string"
        },
        "topic": {
         "type": "string"
        },
        "service": {
         "type": "string",
         "description": "Service slug"
        },
        "procedure": {
         "type": "string"
        },
        "generatedAt": {
         "type": "string",
         "description": "ISO-8601 timestamp"
        },
        "generationSource": {
         "enum": [
          "llm",
          "reasoning",
          "deterministic"
         ],
         "type": "string"
        }
       }
      },
      "payment": {
       "type": "object",
       "properties": {
        "code": {
         "type": "string"
        },
        "payer": {
         "type": "string"
        },
        "detail": {
         "type": "string"
        },
    
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-catalog-submission-readiness-gate-80fdd847/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from k2so-8080.on.ascii.dev](https://www.zero.xyz/host/k2so-8080.on.ascii.dev/llms.txt)