# ZK-Proof-Gated Settlement Acceptance Decision Procedure

> ZK-Proof-Gated Settlement Acceptance 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 2026-10-31).

Returns a blunt, agent-facing decision procedure for when to accept ZK-proof-gated settlement versus plain x402 payment execution, including how to verify proofs, which circuits to trust, and when to demand proof before paying.

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/agent-decision-procedure-for-accepting-zk-proof?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: down
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/zk-proof-gated-settlement-acceptance-decision-procedure-099c723f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fC6YtdK_jNRn3ZGOgLLUW

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 zk-proof-gated-settlement-acceptance-decision-procedure-099c723f
```

Example prompt: Give me the blunt decision procedure for when I should accept a ZK-proof-gated settlement versus just doing a plain x402 payment — I need to know how to verify the proof, which circuits to trust, and when demanding proof before paying is actually worth it.

## When to prefer this

Use this endpoint when an agent needs a concrete, non-marketing decision procedure for evaluating ZK-proof-gated settlement offers in x402 contexts — specifically when the agent must decide at runtime whether to require cryptographic proof of delivery before releasing payment, or when building a trust policy for ZK circuits. Prefer this over generic ZK documentation when you need agent-executable logic rather than explanatory prose.

## Known failure modes

- Payment not included — returns 402 requiring $0.002 USDC via x402 before content is served
- Invalid or missing 'method' field in input schema — returns validation error
- Topic override not recognized or out of scope — may return generic procedure rather than topic-specific guidance
- Provider backend unavailable — returns error with no brief generated
- Malformed request body — returns schema validation failure

## How this service works

Decision procedure for agents choosing between plain x402 calls and ZK-proof-gated settlement. When a provider offers atomic proof-verified delivery, this procedure tells you: (1) whether the proof type matches the claimed execution (circuit pinning, verification key check, proof standard), (2) which circuit/verifier sources are trustworthy enough to accept, (3) when plain payment is acceptable (low value, idempotent, replayable) versus when you must demand proof before paying (high value,

## Output

A structured prose brief containing: a blunt decision procedure for accepting ZK-proof-gated settlement vs plain x402 execution; steps for how an agent verifies a ZK proof from a provider; criteria for which circuits to trust; conditions under which plain x402 payment is acceptable; and conditions under which the agent must demand proof before paying. Also includes the generation source (llm/reasoning/deterministic), model used, and ISO-8601 timestamp.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/zk-proof-gated-settlement-acceptance-decision-procedure-099c723f/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)