# Per-Rail Inference Cost Comparison and Budget Accounting for Agent Transactions

> Per-Rail Inference Cost Comparison and Budget Accounting for Agent Transactions 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 2026-10-12).

Returns a paid decision-procedure brief benchmarking actual inference costs per successful agent decision across model providers and x402 payment rails, not per raw API call.

## Facts

- Endpoint: GET https://k2so-8080.on.ascii.dev/api/services/per-rail-inference-cost-comparison-and-budget-ac?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/per-rail-inference-cost-comparison-and-budget-accounting-for-agent-5ca012c6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Xm7AwcHuWmU0WdZIGJ20h

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 per-rail-inference-cost-comparison-and-budget-accounting-for-agent-5ca012c6
```

Example prompt: Give me a blunt cost comparison and budget accounting procedure for inference across model providers and x402 rails — I want to know the actual cost per successful agent decision, not per API call, so I can pick the cheapest rail and model combination for my agent.

## When to prefer this

Choose this endpoint when you need a structured, blunt decision procedure for comparing actual cost-per-successful-agent-decision across model providers and x402 payment rails — not a generic LLM pricing page or per-token cost table. Prefer it over manual research when you need an actionable schema or procedure an agent can follow, especially when operating on x402 rails and needing to justify or optimize inference budget per transaction outcome.

## Known failure modes

- Payment not included or insufficient (x402 payment required, $0.002 USDC) — returns 402 with payment details
- Missing required 'input' object with type and method fields — returns validation error
- Invalid method value outside GET/HEAD/DELETE enum — rejected by schema
- Topic override field malformed — ignored or causes bad output
- Service temporarily unavailable on ascii.dev host — network timeout or 5xx

## How this service works

Paid agent-facing brief on Per-rail inference cost comparison and budget accounting for agent transactions: benchmarking actual cost per successful agent decision across model providers and x402 rails, not per API call · Build a decision procedure or schema for: Per-rail inference cost comparison and budget accounting for agent transactions: benchmarking actual cost per successful agent decision across model providers and x-0. Blunt decision procedure, not marketing.

## Output

A paid JSON response containing a 'brief' field with prose decision-procedure text, a 'procedure' field with structured guidance, model and topic metadata, an ISO-8601 generatedAt timestamp, and a generationSource enum (llm, reasoning, or deterministic) — all scoped to per-rail inference cost comparison and budget accounting for agent transactions.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "Per-rail inference cost comparison and budget accounting for agent tra paid response",
     "$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)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/per-rail-inference-cost-comparison-and-budget-accounting-for-agent-5ca012c6/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)