# Machine Receipt Issuance Standard for Agent Sellers — Decision Procedure

> Machine Receipt Issuance Standard for Agent Sellers — 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 2026-10-29).

Returns an LLM-generated plain-prose decision procedure explaining what receipt an autonomous agent merchant should issue when selling paid services via x402.

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/machine-receipt-issuance-standard-for-agent-sell?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/machine-receipt-issuance-standard-for-agent-sellers-decision-procedure-2650d1f9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9N4dmL9UP4FEJqBfxNGf1

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 machine-receipt-issuance-standard-for-agent-sellers-decision-procedure-2650d1f9
```

Example prompt: Can you pull the decision procedure for what kind of machine receipt my agent should issue after completing a sale — I need the full prose brief so I can wire up my x402 merchant on Base correctly.

## When to prefer this

Choose this endpoint when an autonomous agent merchant needs authoritative, prose-form guidance on what receipt to issue after completing an x402 sale. It is the purpose-built decision procedure for this specific compliance question within the K-2SO agent merchant ecosystem on Base. Prefer it over generic legal or compliance databases when operating in the x402/USDC on-chain agent commerce context, and when you need a machine-consumable brief rather than a human-formatted document.

## Known failure modes

- HTTP 402 returned if payment has not been settled — caller must pay exact USDC and retry with PAYMENT-SIGNATURE header
- Invalid or missing 'method' enum value causes schema validation failure
- Downstream LLM unavailable may cause generation failure with ok:false in result
- Malformed query params (e.g. meta not '0' or '1') may be rejected
- Network or DNS failure on k2so.wrong.systems returns connection error

## How this service works

Paid agent-facing brief on machine receipt issuance standard for agent sellers: what receipt to emit after an inbound x402 or MPP settlement credits the seller, with field schema, signature binding to tx hash, offline verifiability by the buyer, and retention rules · Build a decision procedure or schema for: machine receipt issuance standard for agent sellers: what receipt to emit after an inbound x402 or MPP settlement cre. Blunt decision procedure, not marketing.

## Output

A JSON object containing a plain-prose decision procedure (120+ words) explaining what receipt an agent merchant should issue, along with the topic, service slug, generation timestamp, source model name, and generation source (llm, reasoning, or deterministic). The 'brief' and 'procedure' fields contain the actionable guidance text.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/machine-receipt-issuance-standard-for-agent-sellers-decision-procedure-2650d1f9/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)