# x402 Rail Optimizer Route

> x402 Rail Optimizer Route is a paid API for AI agents from x402-agent-suite-production.up.railway.app, paid per call via x402, $0.04/call, status unknown (last checked 2026-10-25).

Optimizes and validates routing decisions for HTTP GET/HEAD/DELETE requests through the x402 payment-gated infrastructure, returning an allow/deny decision with a summary.

## Facts

- Endpoint: POST https://x402-agent-suite-production.up.railway.app/api/rail-optimizer/route?utm_source=zero.xyz
- Price: $0.04/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-25
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-rail-optimizer-route-ae42ca43
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PKVZ1kkTK78FbW6gNyxka

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 x402-rail-optimizer-route-ae42ca43 -d '<json body>'
```

Example prompt: Check whether a GET request should be routed through the x402 rail optimizer and give me the allow/deny decision with a summary.

## When to prefer this

Choose this endpoint when you need a lightweight, x402-native route authorization check specifically for idempotent HTTP methods (GET, HEAD, DELETE) within an AI agent fleet context. It is ideal when you want a fast allow/deny routing decision with a human-readable summary before dispatching requests, and when your infrastructure already integrates with x402 payment flows. Prefer it over generic API gateways when operating within the x402 ecosystem and needing per-call micropayment-gated routing decisions.

## Known failure modes

- Payment settlement failure if x402 USDC payment of $0.04 is not completed, returning a 402 Payment Required response
- Invalid HTTP method supplied (only GET, HEAD, DELETE are accepted) returns a 400 or validation error
- Missing required 'input' object or 'type'/'method' fields causes schema validation failure
- Network timeout or Railway infrastructure downtime results in a 503 or connection error
- Unsupported request type (not 'http') causes const validation rejection

## How this service works

24 paid x402 infrastructure APIs for AI agent fleets: buy advisor, audition coach, guard, proxy, MPP, attestations, and pipeline orchestration.

## Output

A JSON object containing a boolean 'ok' field indicating request success, a boolean 'allowed' field indicating whether the route is permitted, and a 'summary' string describing the routing decision outcome after x402 payment settlement.

## 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": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "ok",
      "allowed",
      "summary"
     ],
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "allowed": {
       "type": "boolean"
      },
      "summary": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "allowed": true,
  "summary": "Paid response after x402 settlement"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-rail-optimizer-route-ae42ca43/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-agent-suite-production.up.railway.app](https://www.zero.xyz/host/x402-agent-suite-production.up.railway.app/llms.txt)