# Machine Receipt Issuance Standard for Agent Sellers (x402/MPP)

> Machine Receipt Issuance Standard for Agent Sellers (x402/MPP) 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 paid decision procedure brief specifying what receipt fields, signature binding, and retention rules an agent seller must emit after an inbound x402 or MPP settlement credits them.

## Facts

- Endpoint: GET https://k2so-8080.on.ascii.dev/api/services/machine-receipt-issuance-standard-for-agent-sell
- 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/machine-receipt-issuance-standard-for-agent-sellers-x402-mpp-908aa64c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WQg7kRGVG_de6ubMxf_wJ

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-x402-mpp-908aa64c
```

Example prompt: After my agent receives an inbound x402 settlement crediting the seller, what exact receipt should it emit — including required fields, how to bind the signature to the transaction hash, how the buyer can verify it offline, and what retention rules apply?

## When to prefer this

Choose this endpoint when your agent acts as a seller receiving x402 or MPP payments and needs an authoritative, machine-readable specification for what receipt to emit post-settlement — including cryptographic binding, offline buyer verification, and retention policy. Prefer it over generic payment documentation when you need a blunt decision procedure rather than marketing copy, and when the output must be directly actionable by an autonomous agent without human interpretation.

## Known failure modes

- Payment not included or rejected — returns 402 with payment details required
- Invalid query parameters cause schema validation failure
- LLM or reasoning backend unavailable — result may be empty or error flagged in ok field
- Topic override produces out-of-scope or low-quality brief
- Rate limiting or infrastructure timeout on ascii.dev host

## 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 structured JSON response containing a 'brief' field with decision-procedure prose covering: the required receipt field schema after x402/MPP settlement, how to cryptographically bind the receipt signature to the transaction hash, instructions for offline verifiability by the buyer, and retention rules. Also includes service slug, generation timestamp, generation source (llm/reasoning/deterministic), and payment metadata.

## 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)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/machine-receipt-issuance-standard-for-agent-sellers-x402-mpp-908aa64c/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)