# Agent-to-Merchant Post-Payment Feedback and Reputation Update Loop

> Agent-to-Merchant Post-Payment Feedback and Reputation Update Loop is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status down (last checked 2026-09-15).

Returns a structured decision procedure for classifying x402 payment outcomes, computing merchant reputation deltas, and applying allowlist/trust-tier updates with evidence retention and replay guards.

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/agent-to-merchant-post-payment-feedback-and-repu
- Price: $0.002/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-to-merchant-post-payment-feedback-and-reputation-update-loop-f32f5602
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0_EyJFSQYV4VlblgQ11nu

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 agent-to-merchant-post-payment-feedback-and-reputation-update-loop-f32f5602
```

Example prompt: I just settled an x402 payment to a merchant and they delivered the wrong file — walk me through classifying the outcome, computing the reputation delta, and deciding whether to downgrade them from my allowlist, including what evidence I need to retain before recording a negative mark.

## When to prefer this

Choose this endpoint when your agent has just completed an x402 payment and needs a structured, evidence-backed procedure for updating merchant reputation — especially when you need replay protection, minimum-evidence rules before negative deltas, and trust-tier/allowlist governance logic baked in. Prefer this over generic reputation systems when operating in the x402 ecosystem where outcome classes and evidence standards are specific to autonomous agent-merchant interactions.

## Known failure modes

- Payment not settled — returns 402 requiring x402 payment before content is served
- Missing or malformed query parameters — may return default topic procedure rather than a tailored one
- Service unavailable or provider error — returns non-200 with no decision procedure
- Ambiguous topic override — procedure may not match intended merchant scenario
- Stale or cached response — generatedAt timestamp may not reflect current ruleset

## How this service works

Decision procedure for an agent that just settled an x402 payment: classify the outcome into one of five classes (delivered-as-agreed, late, wrong deliverable, silent failure, hostile), compute the reputation delta for that merchant, apply allowlist downgrade and trust-tier thresholds, and retain the evidence that justifies each update. Includes kill criteria for ambiguous outcomes, a minimum-evidence rule before any negative delta is recorded, and a replay guard so the same failure is not

## Output

A paid JSON response containing a prose decision procedure brief for agents, the outcome classification logic across five classes (delivered-as-agreed, late, wrong deliverable, silent failure, hostile), reputation delta computation rules, allowlist downgrade and trust-tier threshold criteria, minimum-evidence requirements before negative deltas are recorded, kill criteria for ambiguous outcomes, and a replay guard mechanism — plus metadata including generation source, timestamp, and service slug.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-to-merchant-post-payment-feedback-and-reputation-update-loop-f32f5602/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)