# x402 Trust Verification Budget Ceiling Decision Procedure

> x402 Trust Verification Budget Ceiling Decision Procedure is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-30).

Returns a verification tier (skip, spot-check, or full-verify) and breakeven formula for how much verification an agent should buy per x402 payment, given payment value, verification costs, reputation, and fraud-loss expectation.

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/x402-trust-verification-budget-ceiling-a-decisio?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-trust-verification-budget-ceiling-decision-procedure-41ad8790
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wrfdwFiHLsRgReuxG_uLY

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 x402-trust-verification-budget-ceiling-decision-procedure-41ad8790
```

Example prompt: I'm about to make a 10 USDC x402 payment to a counterparty with a reputation score of 0.7 — each signature verification costs 0.002 USDC and my expected fraud loss rate is 2%. Tell me whether I should skip verification, do a spot-check, or run full verification, and give me the breakeven formula.

## When to prefer this

Use this endpoint when an AI agent needs to make a real-time economic decision about how much verification to apply to an x402 payment, particularly when verification itself has a non-trivial cost. It is more useful than static policy rules because it incorporates payment value, per-check costs, reputation scores, and fraud expectations into a dynamic breakeven calculation. Prefer it over manual heuristics when operating at scale with variable counterparty trust levels or variable payment sizes.

## Known failure modes

- Payment not included or insufficient — returns 402 with payment requirements
- Invalid or missing query parameters — returns error in result.ok field
- LLM generation failure — generationSource may fall back to deterministic output
- Network timeout on the upstream generation service — request may hang or return 5xx
- Topic override not recognized — may return generic procedure rather than tailored one

## How this service works

Paid agent-facing brief on x402 trust verification budget ceiling: a decision procedure for an agent deciding how much verification to buy per payment. Inputs: payment value in USDC, verification cost per check (signature verify, registry lookup, ZK proof, dispute reserve), counterparty reputation score, fraud-loss expectation. Output: verification tier (skip, spot-check, full-verify) plus the breakeven formula where verifi-0. Blunt decision procedure, not marketing.

## Output

A structured response containing: a verification tier recommendation (skip, spot-check, or full-verify), a prose decision procedure brief explaining the reasoning, the breakeven formula showing where verification cost equals expected fraud loss, the topic slug, generation source (llm, reasoning, or deterministic), and an ISO-8601 timestamp.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "x402 trust verification budget ceiling: a decision procedure for an ag paid response",
     "$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": "x402-trust-verification-budget-ceiling-a-decisio",
   "procedure": "same as brief",
   "generatedAt": "2026-01-01T00:00:00.000Z",
   "generationSource": "deterministic"
  },
  "service": "x402-trust-verification-budget-ceiling-a-decisio",
  "provider": "K-2SO"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-trust-verification-budget-ceiling-decision-procedure-41ad8790/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)