# Untrusted Payload Quarantine Decision Procedure

> Untrusted Payload Quarantine Decision Procedure 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 2026-09-13).

Returns a structured decision procedure guiding agents on how to quarantine and evaluate untrusted content payloads (NFT metadata, marketplace listings, merchant responses) before forming payment intent.

## Facts

- Endpoint: GET https://k2so-8080.on.ascii.dev/api/services/quarantine-decision-procedure-for-untrusted-cont
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/untrusted-payload-quarantine-decision-procedure-f02ec867
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_N9B0BuAMjBrekhnh0t9OI

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 untrusted-payload-quarantine-decision-procedure-f02ec867
```

Example prompt: Before I approve this NFT marketplace payment, walk me through the quarantine decision procedure for untrusted payload metadata — I need to know how to tier the content origin, detect hidden instructions, and log evidence alongside the transaction.

## When to prefer this

Choose this endpoint when your agent is about to process payment intent derived from attacker-controllable content sources such as NFT metadata, marketplace listings, or third-party merchant responses, and you need a structured, auditable decision procedure — not just a static rule. Especially valuable when payment values vary and you need threshold-based re-inspection gates, or when you require evidence logging tied to the payment for dispute purposes.

## Known failure modes

- Missing or malformed input type/method fields returns a 400-level error
- Service unavailable or upstream LLM failure may return an error with ok:false
- Payment not attached or insufficient funds returns a 402 requiring x402 payment flow
- Topic override not recognized may fall back to default quarantine procedure
- Response may be LLM-generated and should be validated against current agent policy

## How this service works

Decision procedure for quarantining untrusted content payloads (NFT metadata, marketplace listings, merchant response bodies) before an agent forms payment intent. Covers trust-tiering of content origins, hidden-instruction heuristics in metadata fields, payload allowlists, re-inspection gates when payment value exceeds thresholds, and evidence logging alongside the payment for auditability.

## Output

A structured prose decision procedure covering: trust-tiering of content origins, heuristics for detecting hidden instructions in metadata fields, payload allowlist criteria, re-inspection gate conditions keyed to payment value thresholds, and evidence logging requirements to attach to the payment record for auditability. Returned as a 'brief' text field alongside service metadata and a generation timestamp.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "Untrusted payload quarantine standard paid response",
     "$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/untrusted-payload-quarantine-decision-procedure-f02ec867/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)