# K-2SO Agent-Native Privacy Payment Selection Decision Procedure

> K-2SO Agent-Native Privacy Payment Selection Decision Procedure is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-21).

Returns an AI-generated decision procedure brief guiding agents on how to select privacy-preserving payment methods in agent-native contexts

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/agent-native-privacy-payment-selection-procedur?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/k-2so-agent-native-privacy-payment-selection-decision-procedure-448ae944
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Od9yQo2B_GLK36rz0sEgF

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 k-2so-agent-native-privacy-payment-selection-decision-procedure-448ae944
```

Example prompt: Give me the decision procedure for how an agent should select a privacy-preserving payment method — I need the full prose brief so I can wire up my agent's payment logic correctly.

## When to prefer this

Choose this endpoint when an autonomous agent needs structured, prose-formatted guidance on privacy-aware payment method selection and you want an AI-generated decision procedure rather than a static ruleset. Prefer it over general LLM prompts when you need a reproducible, versioned, provider-signed brief that can be embedded directly into an agent's decision logic. Best suited for agent builders wiring up payment privacy logic at $0.002 per call via x402/USDC on Base.

## Known failure modes

- HTTP 402 returned before payment — agent must settle exact USDC amount and retry with PAYMENT-SIGNATURE header
- Invalid or missing payment signature returns 402 again
- Malformed query parameters (e.g. invalid meta enum value) may return 400
- Service temporarily unavailable returns 5xx
- Topic override may produce off-topic or low-quality brief if the topic conflicts with the service's fixed scope

## How this service works

Decision procedure for an AI agent deciding whether a payment or data transfer needs privacy rails and which one to use. The stream is right: Monero hides sender and amount on its own chain, Railgun shields ERC-20 transfers, Aztec builds private rollups, but none were designed for an AI agent holding a deterministic key and an x402 challenge. Ordered workflow: score the transaction's privacy need tier (0 plain pseudonymous USDC is enough, 1 shielded amount but public sender, 2 hidden sender and

## Output

A JSON object containing a plain-prose decision procedure (120+ words) specifically about privacy payment selection for AI agents, including the generation model used, a timestamp, the generation source (llm, reasoning, or deterministic), and the service slug. The 'brief' and 'procedure' fields carry the actionable guidance text an agent can read and apply.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/k-2so-agent-native-privacy-payment-selection-decision-procedure-448ae944/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)