# Payment Plumbing Operator Selector

> Payment Plumbing Operator Selector is a paid API for AI agents from k2so-8080.on.ascii.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-20).

Returns a deterministic build/rent/integrate verdict for choosing who should operate payment infrastructure for an agent platform, based on volume, custody, compliance, and latency thresholds.

## Facts

- Endpoint: GET https://k2so-8080.on.ascii.dev/api/services/payment-plumbing-operator-selector?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/payment-plumbing-operator-selector-728326dc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NVWcHGP8-fQ4mai8jcqok

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 payment-plumbing-operator-selector-728326dc
```

Example prompt: We're building an agent platform expecting around $50K in monthly payment volume, need non-custodial key management, and must settle in under 10 seconds — should we self-host an x402 server, use a managed payment facilitator, or integrate directly with the protocol?

## When to prefer this

Use this endpoint when an agent platform or autonomous agent architect needs a structured, threshold-driven decision on payment operator selection rather than a freeform LLM opinion. Prefer it over ad-hoc reasoning when deterministic kill criteria and specific volume/custody/compliance thresholds matter. Especially useful early in platform design when the build-vs-rent-vs-integrate question is unresolved.

## Known failure modes

- Missing or malformed 'input' object returns a 400-level error
- Payment not received results in a 402 Payment Required response before content is delivered
- Invalid method (e.g. POST) returns method not allowed
- Optional 'topic' override not recognized may default to standard procedure
- LLM generation source may introduce non-determinism; 'deterministic' source is most reliable for strict thresholds

## How this service works

Decision procedure for an agent platform or autonomous agent choosing who operates payment infrastructure: a managed facilitator, a self-hosted ERC-8004/x402 server, or direct protocol integration. Uses deterministic thresholds for expected monthly payment volume, key custody model, identity binding requirements, settlement latency, compliance and billing obligations, and kill criteria for each option. Ends with a build, rent, or integrate verdict.

## Output

A structured JSON object containing a build/rent/integrate verdict ('brief' prose field), the decision procedure text, the generation source (llm, reasoning, or deterministic), an ISO-8601 timestamp, and a service slug. Also includes payment metadata confirming the call was paid.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "Payment plumbing operator selector paid response",
     "$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": "string"
        },
        
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/payment-plumbing-operator-selector-728326dc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from k2so-8080.on.ascii.dev](https://www.zero.xyz/host/k2so-8080.on.ascii.dev/llms.txt)