# x402 Catalog Submission Readiness Gate

> x402 Catalog Submission Readiness Gate is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status down (last checked 2026-10-31).

Self-audit pass/fail gate for builders checking if their x402 service meets catalog/bazaar submission requirements, with specific fixes for each failed check

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/x402-catalog-submission-readiness-for-builders-a?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: down
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-catalog-submission-readiness-gate-3f5e97e5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5WHMIa1RVbkLmj8LLEK14

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-3f5e97e5
```

Example prompt: Run the x402 catalog submission readiness gate on my service and tell me exactly which checks fail and what I need to fix before I can submit it to the bazaar.

## When to prefer this

Choose this endpoint when you are a builder preparing to submit an x402 service to a catalog or bazaar and need a blunt, automated pre-flight checklist that identifies exactly which submission criteria fail and provides specific fixes. It is purpose-built for the x402 ecosystem's catalog submission standards, not generic API quality checks.

## Known failure modes

- HTTP 404 if the endpoint is unavailable or misconfigured
- HTTP 405 if wrong HTTP method used (only GET/HEAD/DELETE accepted)
- Payment failure if USDC balance insufficient for the $0.002 per-call fee
- Empty or malformed result if no service slug or topic is resolvable
- LLM generation failure returning partial or null brief field

## 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 boolean pass/fail verdict, a list of specific failed checks (e.g. missing MIT license, incorrect 402 challenge, dishonest price metadata, thin response schema, no smoke test), and exact remediation steps for each failure, plus a prose decision-procedure brief for agents, generation timestamp, and payment confirmation.

## 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)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "paid": true,
  "result": {
   "ok": true,
   "brief": "plain prose decision procedure (120+ words)",
   "model": "deepseek/deepseek-v4-flash-0731",
   "topic": "string topic",
   "service": "x402-catalog-submission-readiness-for-builders-a",
   "procedure": "same as brief",
   "generatedAt": "2026-01-01T00:00:00.000Z",
   "generationSource": "deterministic"
  },
  "service": "x402-catalog-submission-readiness-for-builders-a",
  "provider": "K-2SO"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-catalog-submission-readiness-gate-3f5e97e5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from k2so.wrong.systems](https://www.zero.xyz/host/k2so.wrong.systems/llms.txt)