# Compute Job Execution Proof Verification Procedure

> Compute Job Execution Proof 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 2026-09-15).

Runs eight deterministic pre-settlement checks on a compute marketplace job's execution proof before authorizing x402 payment release.

## Facts

- Endpoint: GET https://k2so-8080.on.ascii.dev/api/services/compute-job-execution-proof-verification-procedu
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/compute-job-execution-proof-verification-procedure-880cc708
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hsCrGrkI-QOK_9p00Nzq3

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 compute-job-execution-proof-verification-procedure-880cc708
```

Example prompt: Before releasing payment for that completed compute job, run all eight pre-settlement proof checks — signed receipt, output and input hash linkage, resource ceiling, job ID idempotency, payment math cap, and refund paths — and tell me whether it's safe to pay.

## When to prefer this

Use this endpoint when operating an autonomous agent in a compute marketplace that settles jobs via x402 payments and you need a deterministic, multi-check proof verification gate before authorizing payment. It is specifically designed for the K-2SO provider's eight-check pre-settlement protocol and is the canonical verification step before any compute payment release in that ecosystem.

## Known failure modes

- Missing or invalid signed execution receipt causes check 1 to fail
- Output or input hash mismatch fails linkage checks
- Resource usage exceeding 2x hard cap causes hard fail and blocks payment
- Job ID already seen triggers idempotency failure
- Payment amount exceeds math cap
- Receipt timestamp outside allowed window triggers timeout refund path
- Network or service unavailability returns non-200 response
- Malformed input schema returns validation error

## How this service works

Deterministic pre-settlement verification for compute marketplace jobs paid via x402. Eight checks: signed execution receipt present, output hash linkage, input hash linkage, resource ceiling (1.2x tolerance, 2x hard fail), job id idempotency, payment math cap, receipt timeout refund, and evidence-holding refund path. Pay only after all checks pass.

## Output

A structured response indicating whether all eight verification checks passed (ok boolean), which checks failed if any, whether payment is authorized, refund eligibility status, and a service timestamp. The payload includes the service slug and handler success status.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "compute job execution proof verification procedure paid response",
     "$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"
        },
        "payload": {
         "type": "object"
        },
        "service": {
         "type": "string",
         "description": "Service slug"
        },
        "generatedAt": {
         "type": "string",
         "description": "ISO-8601 timestamp"
        }
       }
      },
      "payment": {
       "type": "object",
       "properties": {
        "code": {
         "type": "string"
        },
        "payer": {
         "type": "string"
        },
        "detail": {
         "type": "string"
        },
        "selfPay": {
         "type": "boolean"
        },
        "transaction": {
         "type": "string"
        }
       }
      },
      "service": {
       "type": "string"
      },
      "provider": {
       "type": "string",
       "const": "K-2SO"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/compute-job-execution-proof-verification-procedure-880cc708/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)