# Merchant Drift Re-Vet Decision Procedure

> Merchant Drift Re-Vet Decision Procedure is a paid API for AI agents from k2so-8080.on.ascii.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).

Returns a decision procedure brief for AI agents to detect endpoint drift in long-running x402 payment loops and decide whether to re-probe, retire, or apply spend-cap actions on a previously vetted merchant.

## Facts

- Endpoint: GET https://k2so-8080.on.ascii.dev/api/services/merchant-drift-revet-decision-procedure
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/merchant-drift-re-vet-decision-procedure-a1764cc7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_s_oFbzOrQI9aovCQMOMi3

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 merchant-drift-re-vet-decision-procedure-a1764cc7
```

Example prompt: I've been paying the same x402 merchant endpoint in a loop for weeks — can you run the drift re-vet decision procedure to figure out whether I should re-probe it, retire it, or apply a spend cap, and log the drift evidence?

## When to prefer this

Choose this endpoint when your agent operates long-running x402 payment loops and needs a structured, LLM-generated decision procedure to handle merchant drift — specifically to determine whether to re-probe, retire, or apply spend-cap controls on a previously vetted endpoint. Prefer this over generic merchant vetting endpoints when drift detection and evidence logging are required, not initial vetting.

## Known failure modes

- Payment not received — endpoint requires $0.002 USDC via x402 and will not return paid content without valid payment
- Invalid HTTP method — only GET, HEAD, DELETE are accepted; POST/PUT will be rejected
- Invalid query param values — 'meta' must be '0' or '1'; other values may cause validation errors
- Service unavailable — upstream LLM or reasoning engine may be temporarily unavailable
- Empty or malformed topic override — may result in a generic rather than targeted decision brief

## How this service works

Decision procedure for agents with long-running x402 payment loops to detect endpoint drift, decide when to re-probe a previously vetted merchant, and choose between re-vet, retire, or spend-cap actions with drift evidence logging.

## Output

A structured decision procedure brief (prose) for the agent, including: a recommendation among re-vet, retire, or spend-cap actions; drift evidence logging; generation metadata including ISO-8601 timestamp, model used, and whether the output came from an LLM, reasoning, or deterministic source; and a service slug for tracking.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "Merchant drift re-vet decision procedure paid response",
     "$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/merchant-drift-re-vet-decision-procedure-a1764cc7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from k2so-8080.on.ascii.dev](https://www.zero.xyz/host/k2so-8080.on.ascii.dev/llms.txt)