# Machine Receipt Pickup Redemption Verification Procedure

> Machine Receipt Pickup Redemption Verification 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).

Verifies a machine payment receipt as a valid physical pickup authorization token, running ordered checks (signature, price, freshness, one-time use, binding, replay prevention) and returning a deterministic REDEEM, REDEEM_WITH_HOLD, REQUEST_REISSUE, or REJECT decision.

## Facts

- Endpoint: GET https://k2so-8080.on.ascii.dev/api/services/agent-facing-decision-procedure-for-verifying-a
- 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-pickup-redemption-verification-procedure-740d5554
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_R4Jikl1txF3CfCIg12pfT

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-pickup-redemption-verification-procedure-740d5554
```

Example prompt: I just paid for an item and have a machine payment receipt — can you run it through the pickup redemption verification to check if the signature is valid, the price matches what I was quoted, it hasn't been redeemed before, and I'm authorized to collect it at the counter?

## When to prefer this

Choose this endpoint when an AI agent has completed an x402 payment and needs to physically collect goods IRL at a counter — it provides a complete, ordered, deterministic multi-check gate (signature, price, one-time-use, freshness, binding, replay prevention, refund hold) rather than a single validation step. Prefer over ad-hoc receipt checks when fraud prevention, replay/resale prevention, and refund-hold logic all need to be enforced atomically before releasing goods.

## Known failure modes

- Invalid or forged issuer signature returns REJECT with 'signature_authenticity' as failing check
- Price on receipt does not match quoted price returns REJECT with 'price_consistency' failing check
- Receipt nonce already consumed (replay) returns REJECT with 'nonce_consumption' failing check
- Receipt outside freshness window returns REJECT with 'freshness_window' failing check
- Pickup entity binding mismatch returns REJECT with 'entity_binding' failing check
- Receipt in refund-after-pickup hold state returns REDEEM_WITH_HOLD
- Upstream service unavailable or payment not confirmed results in non-200 response

## How this service works

Deterministic buyer-side redemption gate for a machine payment receipt used as a physical pickup authorization token. Ordered checks: issuer signature authenticity, price consistency vs quoted, one-time redemption state, freshness window, pickup entity binding, replay and resale prevention via nonce consumption, refund-after-pickup hold. Outputs REDEEM, REDEEM_WITH_HOLD, REQUEST_REISSUE, or REJECT with the failing check named. For agents that paid and must collect goods IRL from a counter,

## Output

A deterministic decision object containing one of four verdicts — REDEEM, REDEEM_WITH_HOLD, REQUEST_REISSUE, or REJECT — along with the name of any failing check, a prose brief explaining the decision, the generation source (llm, reasoning, or deterministic), and an ISO-8601 timestamp of when the decision was generated.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/machine-receipt-pickup-redemption-verification-procedure-740d5554/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)