# Model Identity Verification for Agent LLM Spend

> Model Identity Verification for Agent LLM Spend is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Returns a decision procedure for detecting model substitution (knockoff/swap) during agent LLM spend, with evidence collection and pay/hold/dispute guidance.

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/model-identity-verification-for-agent-llm-spend
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/model-identity-verification-for-agent-llm-spend-f9dcf873
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Oqe4qlSEFIPgHl1EAXKjr

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 model-identity-verification-for-agent-llm-spend-f9dcf873
```

Example prompt: Before I release payment for this LLM inference session, run the model-identity verification procedure — I want to know if the model responding matches what I was billed for, what evidence to collect (logprobs, latency fingerprints, output hashes), and whether I should pay, hold, or dispute.

## When to prefer this

Choose this endpoint when an AI agent needs a concrete, actionable decision procedure for verifying that the LLM model it paid for is the one that actually responded — especially when pricing anomalies, latency inconsistencies, or output quality drops suggest a knockoff swap. Prefer over general fraud guides when you need specific evidence types (logprobs, watermarks, hashes) and a binary pay/hold/dispute outcome, not marketing prose.

## Known failure modes

- Missing or invalid input object returns schema validation error
- Payment not received results in 402 response requiring x402 micropayment
- Topic override not recognized may fall back to default procedure
- LLM generation source may produce non-deterministic procedure text across calls
- Endpoint unavailability at wrong.systems returns 5xx

## How this service works

Paid agent-facing brief on model-identity verification for agent LLM spend: detect model substitution / knockoff swap, collect verifiable evidence (pricing mismatch, logprobs, latency fingerprints, watermark, prompt/output hashes), decide pay vs hold vs dispute. Blunt decision procedure, not marketing.

## Output

A structured brief containing a blunt decision procedure for model-identity verification: evidence to collect (pricing mismatch, logprobs, latency fingerprints, watermarks, prompt/output hashes), a verdict on whether the model matches what was billed, and an explicit pay/hold/dispute recommendation. Includes service slug, generation timestamp, and generation source (llm/reasoning/deterministic).

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/model-identity-verification-for-agent-llm-spend-f9dcf873/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)