# Japan DG Stablecoin Rail Acceptance Check

> Japan DG Stablecoin Rail Acceptance Check is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status down (last checked 2026-10-21).

Determines whether a target merchant or payment location is reachable via Japan's DG stablecoin rail (USDC/Base), returning an acceptance verdict, settlement path, fee profile, and Japan payment-regulation flags.

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/japan-dg-rail-acceptance-check?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: down
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/japan-dg-stablecoin-rail-acceptance-check-f3111ce9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Kr5cgSzK9N3c6i4TKhHVh

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 japan-dg-stablecoin-rail-acceptance-check-f3111ce9
```

Example prompt: Can you check whether the merchant at Shibuya crossing accepts payments on the Japan DG stablecoin rail — my wallet is USDC on Base, counterparty is Japan-based, and I want to know the settlement path, fees, and any regulatory flags before I commit?

## When to prefer this

Use this endpoint when an AI agent needs to pre-flight a payment to a Japan-based merchant or location via the DG stablecoin rail on USDC/Base, especially when regulatory compliance, wallet surface compatibility, or settlement certainty is required before committing funds. Prefer this over generic payment-route selectors when the Japan DG rail specifically (JCB/DGFT network) is the target and jurisdiction-specific flags matter.

## Known failure modes

- Merchant or payment location not recognized — verdict returned as 'unverified'
- Unsupported wallet surface or rail preference combination — may return partial or null settlement path
- Japan regulatory flags unavailable for certain counterparty jurisdictions
- LLM-generated brief may have lower confidence for edge-case merchant types
- Payment of 0.002 USDC required; unpaid requests return metadata only (meta=1 mode)
- Network or upstream provider failure returning non-200 response

## How this service works

Agent-facing decision procedure for the Japan DG stablecoin payment rail launched on USDC/Base for x402 agent payments. Inputs: target merchant or payment location, wallet surface (USDC on Base, Cloudflare Wallets, exchange custody), rail preference, jurisdiction of the counterparty. Outputs: acceptance verdict (reachable via JCB/DGFT 1.3M+ locations, Base-only, or unverified), settlement path with expected latency, fee profile, Japan payment-regulation flags, and dispute surface. Thresholds

## Output

Returns an acceptance verdict (reachable via JCB/DGFT 1.3M+ locations, Base-only, or unverified), the settlement path with expected latency, a fee profile, Japan payment-regulation flags, and dispute surface information. Also includes a prose decision brief for agents and an ISO-8601 generation timestamp.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/japan-dg-stablecoin-rail-acceptance-check-f3111ce9/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)