JPYC Service Monitor: weekly change feed for Japan-related JPYC and Web3 services

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x52d4901142e2B5680027da5EB47C86CB02a3cA81",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "method": "GET",
        "queryParams": {
          "changedSince": "2026-08-20"
        },
        "type": "http"
      },
      "output": {
        "example": {
          "attribution": [
            "JPYC株式会社"
          ],
          "changes": [
            {
              "changeType": "verified",
              "date": "2026-08-27",
              "slug": "jpyc-ex",
              "sourceUrl": "https://jpyc.co.jp/",
              "summary": "Re-verified against the official source; no factual change.",
              "summaryJa": "公式ソースで再確認。事実関係の変更なし。"
            }
          ],
          "generatedAt": "2026-08-27T01:23:45.000Z",
          "licenseNotice": "Facts summarized from official sources; source rights remain with their owners.",
          "mode": "delta",
          "notice": {
            "code": "sourced-facts-only",
            "detail": "Change events and rows summarize what official sources state; they are not availability guarantees or endorsements.",
            "termsUrl": "https://open-pay.jp/en/terms"
          },
          "query": {
            "changedSince": "2026-08-20",
            "limit": 200
          },
          "schemaVersion": "1.0",
          "services": [
            {
              "category": "exchange",
              "chains": [
                "avalanche",
                "ethereum",
                "polygon"
              ],
              "name": "JPYC EX",
              "nameJa": "JPYC EX",
              "slug": "jpyc-ex",
              "sourceCheckedAt": "2026-08-27T01:00:00.000Z",
              "sourceOk": true,
              "sourceUrl": "https://jpyc.co.jp/",
              "status": "published",
              "supportsJpyc": true,
              "supportsUsdc": false,
              "supportsX402": false,
              "verifiedAt": "2026-08-27"
            }
          ],
          "totalServices": 20
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "additionalProperties": false,
              "properties": {
                "changedSince": {
                  "description": "Return only changes on/after this date (YYYY-MM-DD). Set to your last run date. Omit for the full snapshot.",
                  "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
                  "type": "string"
                },
                "limit": {
                  "description": "1-200 (default 200)",
                  "type": "string"
                }
              },
              "type": "object"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

curl "https://open-pay.jp/api/paid/usdc/jpyc/services"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://open-pay.jp/api/paid/usdc/jpyc/services");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

import httpx
res = httpx.get("https://open-pay.jp/api/paid/usdc/jpyc/services")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header