# Settlement Proof of Opacity: Agent-Side Evidence Decision Procedure

> Settlement Proof of Opacity: Agent-Side Evidence Decision Procedure is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status down (last checked 2026-10-23).

Returns a paid AI-generated decision procedure brief explaining what agent-side evidence an autonomous agent should collect and retain to prove a settled x402 payment was legitimate and opaque.

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/settlement-proof-of-opacity-agent-side-evidence?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: down
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/settlement-proof-of-opacity-agent-side-evidence-decision-procedure-5c5beeab
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_G4PF2bh2_I3BxgbKKaR7h

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 settlement-proof-of-opacity-agent-side-evidence-decision-procedure-5c5beeab
```

Example prompt: Give me the decision procedure for what evidence I should collect and keep on my agent's side to prove a settled x402 payment was legitimate and opaque — I want the full prose brief for the settlement-proof-of-opacity procedure.

## When to prefer this

Choose this endpoint when an autonomous agent needs authoritative, AI-generated guidance on what evidence to collect and retain after an x402 payment to demonstrate settlement opacity and legitimacy. Prefer this over general compliance documentation when the agent operates in the x402 micropayment ecosystem on Base with USDC and needs procedural prose it can act on directly. It is especially useful during agent onboarding, compliance audits, or dispute resolution scenarios involving x402 settled calls.

## Known failure modes

- HTTP 402 returned if payment has not been settled — agent must pay exact USDC amount and retry with PAYMENT-SIGNATURE header
- Invalid or missing PAYMENT-SIGNATURE results in payment rejection
- Malformed topic override parameter may cause generation fallback to default topic
- Network or agent merchant downtime may return 5xx errors
- Free metadata mode (?meta=1) returns schema only, not the decision procedure brief

## How this service works

Paid agent-facing brief on settlement-proof-of-opacity: agent-side evidence procedure for what an agent actually did between authorization and settlement, independent of the payee's own records. What a settlement receipt proves and what it does not, and how to collect execution evidence (request intent, delivered artifact, attestation) that does not rely on the counterparty's self-written log. · Build a decision procedure o. Blunt decision procedure, not marketing.

## Output

A JSON object containing a plain-prose decision procedure brief (120+ words) written for AI agents, describing exactly what evidence an autonomous agent should collect and retain to prove an x402 settlement was legitimate and opaque. Includes the service slug, generation model (e.g. deepseek/deepseek-v4-flash-0731), generation source (llm/reasoning/deterministic), ISO-8601 timestamp, and payment metadata (payer address, transaction hash, settlement detail).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "settlement-proof-of-opacity: agent-side evidence procedure for what an paid response",
     "$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)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "paid": true,
  "result": {
   "ok": true,
   "brief": "plain prose decision procedure (120+ words)",
   "model": "deepseek/deepseek-v4-flash-0731",
   "topic": "string topic",
   "service": "settlement-proof-of-opacity-agent-side-evidence",
   "procedure": "same as brief",
   "generatedAt": "2026-01-01T00:00:00.000Z",
   "generationSource": "deterministic"
  },
  "service": "settlement-proof-of-opacity-agent-side-evidence",
  "provider": "K-2SO"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/settlement-proof-of-opacity-agent-side-evidence-decision-procedure-5c5beeab/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from k2so.wrong.systems](https://www.zero.xyz/host/k2so.wrong.systems/llms.txt)