# Checkpoint Capability Diff Index Decision Procedure

> Checkpoint Capability Diff Index 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 2026-10-28).

Returns a paid, AI-generated decision procedure for evaluating checkpoint capability diff index, including inputs, thresholds, and failure modes.

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/checkpoint-capability-diff-index-build-a-decisio?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: down
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/checkpoint-capability-diff-index-decision-procedure-3877d721
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qz0nLGkWudMIC_FR8CK5W

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 checkpoint-capability-diff-index-decision-procedure-3877d721
```

Example prompt: Can you get me the decision procedure for checkpoint capability diff index — I need the inputs, thresholds, and failure modes spelled out clearly so I know exactly when and how to act on capability changes between checkpoints?

## When to prefer this

Choose this endpoint when you need a structured, agent-consumable decision procedure specifically for checkpoint capability diff index and free documentation does not already cover inputs, thresholds, and failure modes. It is most useful in agentic MLOps or AI evaluation pipelines where a blunt, paid, LLM-generated brief (not marketing) is required to gate decisions about capability changes between model checkpoints.

## Known failure modes

- Payment not completed — returns 402 with payment details instead of result
- Topic override not recognized — may fall back to default checkpoint capability diff topic
- LLM generation failure — generationSource may indicate fallback to deterministic output
- Metadata-only request (meta=1) returns schema without paid content
- Handler failure returns ok:false with no brief populated

## How this service works

Paid agent-facing brief on checkpoint capability diff index · Build a decision procedure or schema for: checkpoint capability diff index. Include inputs, thresholds, failure modes. Falsifier: If free docs already solve the decision, paid product fails.-0. Blunt decision procedure, not marketing.

## Output

Returns a JSON object containing a plain-prose decision procedure (120+ words) under the 'brief' and 'procedure' fields, the topic evaluated, the model used to generate the procedure, a generation source label (llm, reasoning, or deterministic), and an ISO-8601 timestamp — all gated behind a $0.002 USDC x402 micropayment.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/checkpoint-capability-diff-index-decision-procedure-3877d721/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)