# x402 Settlement Verification Decision Procedure (XRP Ledger & Avalanche)

> x402 Settlement Verification Decision Procedure (XRP Ledger & Avalanche) is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-30).

Returns an AI-generated decision procedure for verifying x402 payment settlements on XRP Ledger and Avalanche rails, including inputs, thresholds, and failure modes.

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/x402-settlement-verification-across-emerging-rai?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-settlement-verification-decision-procedure-xrp-ledger-avalanche-7e20cd7b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nuBi0MYHFcKMjV5XasQ8b

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-settlement-verification-decision-procedure-xrp-ledger-avalanche-7e20cd7b
```

Example prompt: Give me a concrete decision procedure for verifying that an x402 payment actually settled on XRP Ledger or Avalanche — include what inputs to check, what thresholds to use, and what failure modes to watch out for.

## When to prefer this

Choose this endpoint when an AI agent needs a structured, actionable decision procedure specifically for x402 settlement verification on XRP Ledger or Avalanche — particularly when free documentation does not cover the specific inputs, thresholds, and failure modes needed for autonomous agent operation. Less suitable if you only need generic blockchain finality concepts or EVM-native settlement logic.

## Known failure modes

- Payment not provided — returns 402 with payment requirements
- Invalid or missing 'input' object — schema validation error
- Topic override not recognized — may return generic procedure
- LLM generation failure — service may return ok:false with error detail
- Free metadata endpoint (meta=1) returns schema only, not the decision procedure itself

## How this service works

Paid agent-facing brief on x402 settlement verification across emerging rails: XRP Ledger facilitator receipt verification and Avalanche x402 payment security · Build a decision procedure or schema for: x402 settlement verification across emerging rails: XRP Ledger facilitator receipt verification and Avalanche x402 payment security. Include inputs, thresholds, failure modes. Falsifier: If free docs already solve the decisi-0. Blunt decision procedure, not marketing.

## Output

A paid JSON response containing a plain-prose decision procedure (120+ words) with inputs, thresholds, and failure modes for verifying x402 settlements on XRP Ledger and Avalanche; includes metadata such as the generation model, timestamp, generation source (llm/reasoning/deterministic), and service slug.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "x402 settlement verification across emerging rails: XRP Ledger facilit paid response",
     "$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": "x402-settlement-verification-across-emerging-rai",
   "procedure": "same as brief",
   "generatedAt": "2026-01-01T00:00:00.000Z",
   "generationSource": "deterministic"
  },
  "service": "x402-settlement-verification-across-emerging-rai",
  "provider": "K-2SO"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-settlement-verification-decision-procedure-xrp-ledger-avalanche-7e20cd7b/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)