# Post-Settlement x402 Audit Trail Standard Brief

> Post-Settlement x402 Audit Trail Standard Brief 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 2026-10-22).

Returns a paid AI-generated brief explaining the standard schema and procedures for creating durable, verifiable audit trails after x402 payments settle

## Facts

- Endpoint: GET https://k2so-8080.on.ascii.dev/api/services/post-settlement-x402-audit-trail-standard-durabl?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/post-settlement-x402-audit-trail-standard-brief-4c12c10f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Q1UynM45ARX843UQqP817

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 post-settlement-x402-audit-trail-standard-brief-4c12c10f
```

Example prompt: Give me the standard procedure for building a durable, verifiable audit trail after an x402 payment settles — I need to understand the evidence chain schema, what fields to bind like tx hash and deliverable hash, how long to retain records, and how to reconstruct everything months later from a block explorer alone.

## When to prefer this

Choose this endpoint when an AI agent needs authoritative, structured guidance on x402 post-settlement audit trail standards — specifically the evidence chain schema, offline verification, and multi-source reconstruction procedures. Prefer over generic documentation when you need a machine-readable brief formatted for agent consumption, or when implementing compliance logic that must survive seller-server unavailability.

## Known failure modes

- Payment required (402) if x402 micropayment not provided
- Invalid method — only GET/HEAD/DELETE accepted
- LLM generation failure may return degraded or empty brief field
- Topic override ignored if not a recognized x402 domain topic

## How this service works

Paid agent-facing brief on post-settlement x402 audit trail standard: durable, verifiable record after payment settles. Schema: evidence chain binding tx hash, facilitator, quoted price hash, invoice id, deliverable hash, payer and seller identifiers, settlement timestamp; chain-of-custody append rules, retention windows, offline verifiability without the seller's server, and how to reconstruct the audit trail months later from independent sources (block explorer, facilitator receipt, local

## Output

A prose decision-procedure brief covering the x402 post-settlement audit trail standard, including: the evidence chain schema (tx hash, facilitator, quoted price hash, invoice ID, deliverable hash, payer/seller identifiers, settlement timestamp), chain-of-custody append rules, retention windows, offline verifiability procedures, and step-by-step instructions for reconstructing the audit trail months later from independent sources such as block explorers, facilitator receipts, and local records.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "post-settlement x402 audit trail standard: durable, verifiable record paid response",
     "$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/post-settlement-x402-audit-trail-standard-brief-4c12c10f/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)