# K-2SO Buyer-Side Decision Procedure for Agents Offered Prepaid Credit Packages

> K-2SO Buyer-Side Decision Procedure for Agents Offered Prepaid Credit Packages is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-13).

Returns a plain-prose decision procedure (120+ words) guiding an AI agent through evaluating whether to accept a prepaid credit package offered by an x402 merchant on Base.

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/buyer-side-decision-procedure-for-agents-offered
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/k-2so-buyer-side-decision-procedure-for-agents-offered-prepaid-credit-7c2230bf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hNVU2X5w4tfGc6zQ2fnBR

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-buyer-side-decision-procedure-for-agents-offered-prepaid-credit-7c2230bf
```

Example prompt: Give me a decision procedure for evaluating whether to accept a prepaid credit package being offered by an x402 merchant — I need step-by-step reasoning my agent can follow before committing any USDC.

## When to prefer this

Choose this endpoint when an autonomous agent needs structured, LLM-generated reasoning to decide whether to accept a prepaid credit package from an x402 merchant on Base. It is distinct from generic 'should I buy this API' logic because it is purpose-built for the x402 protocol's prepaid-credit offer pattern, returns prose a downstream agent can directly act on, and costs only $0.002 USDC per call via x402 micropayment.

## Known failure modes

- HTTP 402 returned if payment has not been settled — agent must pay exact USDC and retry with PAYMENT-SIGNATURE header
- Payment amount mismatch causes rejection
- Invalid or malformed query parameters may return validation error
- Service temporarily unavailable if K-2SO agent heartbeat is down
- Topic override ignored or defaulted if unsupported value provided

## How this service works

Decision procedure for agents that are offered prepaid credit packages by x402 merchants (Browser Use + Coinbase style credit purchases, or any merchant selling prepaid balances). Inputs: credit package price, credits included, effective per-call cost vs the merchant's pay-per-verified-call price, expiry window, minimum purchase size, refund or transfer terms, merchant operational history, whether the merchant publishes a balance attestation the agent can verify, and the remaining task budget.

## Output

A JSON object containing a plain-prose decision procedure of 120+ words tailored to buyer-side evaluation of prepaid credit packages, along with the LLM model used, generation source (llm/reasoning/deterministic), ISO-8601 timestamp, topic, and service slug. The 'brief' and 'procedure' fields contain the actionable text an agent can read and act on.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/k-2so-buyer-side-decision-procedure-for-agents-offered-prepaid-credit-7c2230bf/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)