# Payment-Gate Sufficiency Classification Decision Procedure

> Payment-Gate Sufficiency Classification Decision Procedure 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).

Returns an AI-generated decision procedure helping agents determine whether paying a 402-gated endpoint will actually unlock it, or whether additional credentials (identity, KYC, region, age, session) are also required before funds should move.

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/payment-gate-sufficiency-classification-for-agen?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/payment-gate-sufficiency-classification-decision-procedure-94838f08
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_daP6WL9BPEOkynzgEnb2b

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 payment-gate-sufficiency-classification-decision-procedure-94838f08
```

Example prompt: I just hit a 402 on an endpoint and I'm about to pay — can you run the payment-gate sufficiency classification procedure to tell me whether paying alone will unlock it, or if I also need identity, KYC, or region credentials before I send funds?

## When to prefer this

Use this endpoint when an agent has encountered a 402-challenged resource and needs to determine, before committing payment, whether payment alone is sufficient or whether additional credentials (KYC, identity, age, region, session) are also required. Prefer this over generic payment flows when the gate's requirements are unclear from headers alone, when financial waste from paying an unsatisfiable gate is a concern, or when operating in regulated domains where identity/region gates are common alongside payment gates.

## Known failure modes

- Payment not received or too low — endpoint remains 402-gated and no brief is returned
- Underspecified or missing topic override may produce generic rather than context-specific guidance
- LLM generation failure may return an error or fallback deterministic response
- Invalid HTTP method (only GET, HEAD, DELETE supported) causes request rejection
- Gate metadata unavailable or ambiguous — brief may note inability to classify gate shape conclusively

## How this service works

Paid agent-facing brief on Payment-gate sufficiency classification for agents: decision procedure for an agent that hits a 402-challenged endpoint and must determine BEFORE paying whether payment alone unlocks the resource, or whether the gate also demands identity, age, region, KYC, or session credentials, including how to detect the gate shape from the challenge headers/meta without leaking data, sequencing credential checks, and aborting before funds move when the gate is underspecified.

## Output

A paid JSON response containing a prose decision-procedure brief for agents, including gate shape classification, steps to detect credential requirements from challenge headers without data leakage, recommended sequencing of credential checks before payment, and explicit abort conditions when the gate is underspecified. Also includes metadata such as generation source (llm, reasoning, or deterministic), ISO-8601 timestamp, and topic slug.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "Payment-gate sufficiency classification for agents: decision procedure paid response",
     "$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": {
         
… (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": "payment-gate-sufficiency-classification-for-agen",
   "procedure": "same as brief",
   "generatedAt": "2026-01-01T00:00:00.000Z",
   "generationSource": "deterministic"
  },
  "service": "payment-gate-sufficiency-classification-for-agen",
  "provider": "K-2SO"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/payment-gate-sufficiency-classification-decision-procedure-94838f08/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)