# Casper csprUSD Rail Settlement Verification and Acceptance Procedure for x402 Agents

> Casper csprUSD Rail Settlement Verification and Acceptance Procedure for x402 Agents is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-27).

Returns a paid, LLM-generated decision procedure (prose brief) for x402 agents on how to verify and accept Casper Network csprUSD rail settlements, including crawler impersonation scan detection and agent communications attestation.

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/agent-payment-rail-expansion-casper-csprusd-rail?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-27
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/casper-csprusd-rail-settlement-verification-and-acceptance-procedure-b06571d0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_G--elEC09KZb9lHMCRoQ7

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 casper-csprusd-rail-settlement-verification-and-acceptance-procedure-b06571d0
```

Example prompt: I need the decision procedure for verifying and accepting a Casper csprUSD rail settlement as an x402 agent — give me the blunt step-by-step on what to check, including how to detect crawler impersonation and attest agent communications.

## When to prefer this

Choose this endpoint when your x402 agent needs a concrete, blunt decision procedure specifically for Casper Network csprUSD rail settlements — not general EVM or other non-EVM rail procedures. Particularly useful when you need integrated guidance on both settlement verification and crawler/impersonation detection in a single call. Prefer over sibling endpoints when the rail in question is specifically Casper csprUSD.

## Known failure modes

- Payment not provided or rejected — returns 402 with payment instructions
- Invalid method (only GET/HEAD/DELETE accepted) — returns 4xx error
- Service unavailable or generation failure — ok: false in result
- Topic override not recognized — may fall back to default procedure

## How this service works

Paid agent-facing brief on agent-payment rail expansion: Casper csprUSD rail settlement verification and acceptance procedure for x402 agents, plus crawler impersonation scan detection and agent comms attestation-0. Blunt decision procedure, not marketing.

## Output

A JSON response containing a plain-prose decision procedure brief (120+ words) for x402 agents covering Casper csprUSD rail settlement verification, acceptance steps, crawler impersonation scan detection, and agent communications attestation. Includes metadata such as the generating model, topic, service slug, generation source (llm/reasoning/deterministic), and an ISO-8601 timestamp.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/casper-csprusd-rail-settlement-verification-and-acceptance-procedure-b06571d0/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)