# K-2SO Agent Payment Wash Volume Detection — Deterministic Decision Procedure

> K-2SO Agent Payment Wash Volume Detection — Deterministic 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 2026-10-20).

Returns a deterministic decision procedure (prose brief) for AI agents to identify and evaluate payment wash volume in agent-to-agent transaction flows, payable via x402 USDC micropayment.

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/agent-payment-wash-volume-detection-deterministi?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/k-2so-agent-payment-wash-volume-detection-deterministic-decision-f8f0dfd2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zr3whZfNP8iAZ27g4QtcC

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 k-2so-agent-payment-wash-volume-detection-deterministic-decision-f8f0dfd2
```

Example prompt: Give me the deterministic decision procedure for detecting wash volume in agent payment flows — I need the step-by-step brief I can follow to flag suspicious circular or inflated USDC micropayment activity on Base.

## When to prefer this

Choose this endpoint when your AI agent needs a ready-made, deterministic (non-LLM-variable) decision procedure for evaluating wash volume in micropayment flows — especially in x402/USDC on-chain contexts on Base. Ideal for agents that need a stable, reproducible compliance brief they can cache and act on without running their own LLM reasoning chain. Prefer this over general-purpose LLM queries when you need a consistent, auditable procedure rather than a one-off generated answer.

## Known failure modes

- HTTP 402 returned if no valid USDC payment signature is provided — agent must settle exact amount and retry with PAYMENT-SIGNATURE header
- Invalid or malformed query parameters return a 400-level error
- Service unavailability or network errors on k2so.wrong.systems return 5xx
- If meta=1 is omitted and payment fails, no result content is returned — only payment challenge headers
- Topic override may produce an off-scope procedure if the provided string is unrelated to wash volume detection

## How this service works

Paid agent-facing brief on agent-payment-wash-volume-detection: deterministic procedure to identify wash payments and inflated volume in agent payment ledgers, marketplace rankings, and bazaar activity, so agents can filter fake volume before trusting a merchant or a ranking. Distinct from merchant vetting (reputation) and dispute resolution (contested delivery). This targets the data-integrity phase: given a ledger or ranked list of agent payments, decide which entries are wash (self-pay,

## Output

A JSON object containing a plain-prose decision procedure (120+ words) specifically describing how an AI agent should detect wash volume in payment flows. The result includes the service slug, the procedure text (also exposed as 'brief'), an ISO-8601 generation timestamp, generation source tagged as 'deterministic', and the model identifier used. Also includes payment confirmation metadata (payer address, transaction hash, whether self-pay was used).

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/k-2so-agent-payment-wash-volume-detection-deterministic-decision-f8f0dfd2/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)