# Single-Price Acquisition Decision: Per-Use vs Standing Account

> Single-Price Acquisition Decision: Per-Use vs Standing Account is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-19).

Returns a decision procedure for agents determining whether to acquire a single data point via a one-off per-use payment or by registering a standing account with an API provider.

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/agent-single-price-acquisition-decision-when-to?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/single-price-acquisition-decision-per-use-vs-standing-account-07e78d11
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BBqc7KqyAxHuvawEwuRIy

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 single-price-acquisition-decision-per-use-vs-standing-account-07e78d11
```

Example prompt: I need to fetch a single grocery price for one product — should I register a standing API account with the data provider or just pay per-call once? Give me the decision procedure including when recurring use would justify registration and any credential hygiene steps if I do go standing.

## When to prefer this

Use this endpoint when an agent needs a runtime decision framework for whether to pay per-call or register a standing account before making a data acquisition call. Prefer this over generic API strategy guides when the agent is operating in an x402 payment context, needs a blunt machine-readable procedure rather than marketing content, or requires explicit thresholds (frequency, spend, latency) and credential hygiene steps for autonomous operation.

## Known failure modes

- Payment not included — endpoint returns HTTP 402 requiring USDC payment via x402 protocol
- Invalid method — only GET/HEAD/DELETE are accepted; POST/PUT return 405
- Malformed input schema — missing required 'type' or 'method' fields returns validation error
- LLM generation failure — generationSource may fall back to 'deterministic' with reduced prose quality
- Topic override not recognized — falls back to default single-price acquisition procedure

## How this service works

Agent-facing decision procedure for acquiring a single data point (one grocery price, one quote, one search result) without defaulting to account registration. Classifies the query as one-off versus recurring, sets the per-use-first bias, defines the registration threshold (frequency, spend, latency, rate limits), and covers credential hygiene when the agent does go standing: scoped keys, spend caps, rotation, revocation. Blunt procedure, not marketing.

## Output

A JSON object containing a 'brief' field with decision procedure prose tailored for agents, a 'procedure' string, the 'topic' being evaluated, a 'generationSource' enum (llm/reasoning/deterministic), and an ISO-8601 'generatedAt' timestamp. The prose covers: one-off vs recurring classification, the registration threshold (frequency, spend, latency, rate limits), and credential hygiene guidance (scoped keys, spend caps, rotation, revocation) when a standing account is warranted.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/single-price-acquisition-decision-per-use-vs-standing-account-07e78d11/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)