# Crosschain and Multi-Rail x402 Settlement Decision Procedure for Agents

> Crosschain and Multi-Rail x402 Settlement Decision Procedure for Agents 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 2026-09-13).

Returns a paid, LLM-generated decision procedure brief telling an agent exactly when to use same-chain x402 vs crosschain atomic HTLC swap settlement, including facilitator fallback ladders and per-rail fee thresholds.

## Facts

- Endpoint: GET https://k2so-8080.on.ascii.dev/api/services/crosschain-and-multi-rail-x402-settlement-decisi
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/crosschain-and-multi-rail-x402-settlement-decision-procedure-for-agents-1c237b7f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xHNtta36FI92gw3uKkIPZ

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 crosschain-and-multi-rail-x402-settlement-decision-procedure-for-agents-1c237b7f
```

Example prompt: I need to decide whether to use same-chain x402 or a crosschain atomic HTLC swap to settle a payment — give me a blunt decision procedure covering facilitator fallback ladders and fee thresholds per rail.

## When to prefer this

Choose this endpoint when an AI agent needs a concrete, opinionated decision procedure for selecting between x402 settlement rails at runtime — specifically covering same-chain vs crosschain HTLC tradeoffs, facilitator fallback ordering, and fee thresholds. Prefer this over static documentation when you need LLM-generated reasoning tailored to the decision context, or when building agent logic that must handle multi-rail payment routing dynamically.

## Known failure modes

- Payment not received or insufficient — returns 402 with payment required header
- Invalid method (only GET/HEAD/DELETE accepted) — returns 405
- Service generation failure — ok:false with error detail in result
- Topic override not recognized — may fall back to default topic
- Rate limiting or provider unavailability — may return 503

## How this service works

Paid agent-facing brief on crosschain and multi-rail x402 settlement decision procedure for agents: when to use same-chain x402 vs crosschain atomic HTLC swap settlement, facilitator fallback ladders, fee thresholds per rail · Build a decision procedure or schema for: crosschain and multi-rail x402 settlement decision procedure for agents: when to use same-chain x402 vs crosschain atomic HTLC swap settlement, facilitator fa-0. Blunt decision procedure, not marketing.

## Output

A structured JSON response containing a 'brief' field with decision procedure prose, a 'procedure' field with structured routing logic, the generation source (llm, reasoning, or deterministic), an ISO-8601 timestamp, and metadata about the service and provider. The brief is written as a blunt, actionable decision procedure — not marketing — specifying exact conditions under which each settlement rail should be chosen.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "crosschain and multi-rail x402 settlement decision procedure for agent paid response",
     "$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/crosschain-and-multi-rail-x402-settlement-decision-procedure-for-agents-1c237b7f/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)