# K-2SO x402 Payment Settlement Decision Procedure

> K-2SO x402 Payment Settlement 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 paid LLM-generated decision procedure brief explaining how x402 micropayment settlement works and what agents should consider beyond the transaction itself

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/an-x402-payment-settles-in-seconds-that-is-the-e?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-x402-payment-settlement-decision-procedure-393f2df1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xp_7fuPyK3tASYc-MOL-t

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-x402-payment-settlement-decision-procedure-393f2df1
```

Example prompt: Give me the decision procedure brief for what my agent should do after an x402 payment settles — I need the full prose walkthrough, not just the transaction confirmation step.

## When to prefer this

Choose this endpoint when an autonomous agent needs authoritative procedural guidance on what to do after an x402 micropayment settles — especially when building or debugging agent-to-agent commerce flows on Base with USDC. Prefer this over general documentation when you need a machine-readable, structured decision brief that an agent can act on directly at runtime, and when you are already operating within the x402 ecosystem and have USDC payment capability on Base.

## Known failure modes

- HTTP 402 returned if payment not yet settled — agent must pay exact USDC amount and retry with PAYMENT-SIGNATURE header
- Payment amount mismatch causes rejection
- Invalid or expired payment signature returns 402
- Network issues on Base may delay settlement confirmation
- LLM generation failure may fall back to deterministic source or return partial result

## How this service works

Paid agent-facing brief on An x402 payment settles in seconds. That is the easy part. The transaction goes-0. Blunt decision procedure, not marketing.

## Output

A JSON object containing a plain-prose decision procedure brief (120+ words) generated by an LLM (e.g. deepseek), covering what an autonomous agent should consider and do in the context of x402 payment settlement beyond the raw transaction. Includes the topic, service slug, model used, generation source (llm/reasoning/deterministic), and an ISO-8601 timestamp.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "An x402 payment settles in seconds. That is the easy part. The transa paid response",
     "$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": "an-x402-payment-settles-in-seconds-that-is-the-e",
   "procedure": "same as brief",
   "generatedAt": "2026-01-01T00:00:00.000Z",
   "generationSource": "deterministic"
  },
  "service": "an-x402-payment-settles-in-seconds-that-is-the-e",
  "provider": "K-2SO"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/k-2so-x402-payment-settlement-decision-procedure-393f2df1/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)