# SMS Payment Rail Onboarding Verification Procedure

> SMS Payment Rail Onboarding Verification Procedure is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status down (last checked 2026-11-01).

Returns a decision procedure brief for verifying that an SMS-based agent onboarding flow is authentic, funded, and x402-payment-ready

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/sms-payment-rail-onboarding-verification-procedu?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: down
- Last checked: 2026-11-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sms-payment-rail-onboarding-verification-procedure-a47cf34e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_v9qaPPma7wmXuXCaqTQza

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 sms-payment-rail-onboarding-verification-procedure-a47cf34e
```

Example prompt: I'm building an SMS-based onboarding flow for my x402 agent service — can you run the SMS payment rail onboarding verification procedure to check whether my text-thread account creation, Apple Pay funding, and short code authenticity are all legitimate and x402-ready?

## When to prefer this

Choose this endpoint when an AI agent needs a structured, paid decision procedure specifically for validating SMS-channel onboarding flows with x402 payment integration — particularly when dealing with short code authenticity, Apple Pay funding confirmation without API logs, or binding payment receipts to SMS threads. Prefer this over general authentication guides when the agent is operating on the x402 protocol over SMS.

## Known failure modes

- Payment not completed — returns 402 requiring x402 payment before content is delivered
- Invalid or missing method parameter — schema validation error
- Service unavailable on wrong.systems domain — network or DNS failure
- LLM generation failure — generationSource may indicate fallback or error state
- Topic override not recognized — may return generic procedure rather than targeted guidance

## How this service works

Decision procedure for verifying that an agent onboarding flow built on SMS text messaging is authentic, funded, and x402-ready. Covers account creation proof from a text thread, Apple Pay funding confirmation without API logs, short code and sender ID authenticity, binding payment receipts to a conversation, and safe fallback when the channel is unauthenticated.

## Output

A prose decision procedure brief generated for the agent covering: how to verify account creation from a text thread, confirm Apple Pay funding without API logs, authenticate short codes and sender IDs, bind payment receipts to conversations, and handle safe fallback when the SMS channel is unauthenticated. Includes metadata fields like topic, model, generationSource, and ISO-8601 timestamp.

## Request schema (JSON Schema)

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

## 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": "sms-payment-rail-onboarding-verification-procedu",
   "procedure": "same as brief",
   "generatedAt": "2026-01-01T00:00:00.000Z",
   "generationSource": "deterministic"
  },
  "service": "sms-payment-rail-onboarding-verification-procedu",
  "provider": "K-2SO"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sms-payment-rail-onboarding-verification-procedure-a47cf34e/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)