# Bought Web Action Receipt Verification Standard

> Bought Web Action Receipt Verification Standard 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).

Validates x402 web automation payment receipts by checking payment match, execution proof, schema conformance, idempotency key reuse, and replay resistance before certifying a page action as delivered.

## Facts

- Endpoint: GET https://k2so-8080.on.ascii.dev/api/services/bought-web-action-receipt-verification-standard
- 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/bought-web-action-receipt-verification-standard-2ec324b2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fXszhOPNAw6ytMSiC5f3j

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 bought-web-action-receipt-verification-standard-2ec324b2
```

Example prompt: Can you verify this x402 web action receipt for me — I need to confirm the payment matches the original quote, the execution proof fields are valid, no idempotency key reuse, and it passes replay resistance before I accept it as certified delivery evidence?

## When to prefer this

Choose this endpoint when you need a post-purchase gate specifically for x402 web automation receipts and require checks across payment match, execution proof integrity, idempotency key uniqueness, schema conformance, and replay resistance in a single call. Prefer it over generic payment verification when the receipt comes from an x402-based web action automation flow and certified delivery evidence is required before proceeding.

## Known failure modes

- Payment amount does not match the original quote — receipt rejected
- Execution proof fields are missing or malformed — validation fails
- Idempotency key has been seen before — replay detected and rejected
- Receipt schema does not conform to expected structure — conformance check fails
- Replay resistance check fails due to reused nonce or stale timestamp
- Service unavailable or upstream error returns non-ok response
- Invalid HTTP method used (only GET/HEAD/DELETE accepted)

## How this service works

Post-purchase gate for x402 web automation receipts. Checks payment match against quote, execution proof fields, result schema conformance, idempotency key reuse, and replay resistance before accepting a claimed page action as certified delivery evidence.

## Output

Returns a structured object with an 'ok' boolean indicating overall handler success, a 'paid' boolean, a 'result' object containing a decision procedure brief (prose guidance for agents), topic, service slug, generation source (llm/reasoning/deterministic), and an ISO-8601 timestamp. Also includes payment details such as payer, transaction hash, and self-pay flag. Effectively certifies whether the presented receipt constitutes valid delivery evidence.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "Bought web action receipt verification standard paid response",
     "$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/bought-web-action-receipt-verification-standard-2ec324b2/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)