Monitoring · x402 · early usage

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

by open-pay.jp · discovered, not yet claimed by its owner · updated 2026-10-09

30d calls1

30d payers1

MethodGET

Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

JPYC Service Monitor: weekly change feed for Japan-related JPYC and Web3 services. Each event is dated, typed (added / updated / removed / verified) and tied to an official source URL. Call with changedSince=YYYY-MM-DD set to your last run date to fetch only what changed; an empty changes list explicitly means no change, so a scheduled agent can report that without guessing. Without changedSince you get the full monitor snapshot.

Tags: jpyc · japan · web3 · monitoring · change-feed · bazaar

Call contract

Method: GET
Input: query parameters
Output: json
Last paid call: 2026-10-09

Input example from Bazaar metadata

{
  "changedSince": "2026-08-20"
}

Output example

{
  "attribution": [
    "JPYC株式会社"
  ],
  "changes": [
    {
      "changeType": "updated",
      "collectedAt": "2026-08-27",
      "date": "2026-05-15",
      "diffs": [
        {
          "currentValue": [
            "avalanche",
            "ethereum",
            "polygon",
            "kaia"
          ],
          "field": "chains",
          "previousValue": [
            "avalanche",
            "ethereum",
            "polygon"
          ]
        },
        {
          "currentValue": "1,000,000 JPY per transaction (issuance)",
          "field": "limit",
          "previousValue": "1,000,000 JPY per day (issuance)"
        }
      ],
      "slug": "jpyc-ex",
      "sourceUrl": "https://prtimes.jp/main/html/rd/p/000000315.000054018.html",
      "summary": "JPYC EX added Kaia support and changed the issuance cap from 1M JPY per day to 1M JPY per transaction.",
      "summaryJa": "JPYC EX が Kaia に対応。発行上限を「1日100万円」から「1回100万円」へ変更。"
    }
  ],
  "generatedAt": "2026-08-27T01:23:45.000Z",
  "hasMore": false,
  "licenseNotice": "Facts summarized from official sources; source rights remain with their owners.",
  "mode": "delta",
  "nextChangedSince": "2026-08-27",
  "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": "2026-05-15",
    "limit": 200
  },
  "schemaVersion": "1.0",
  "services": [
    {
      "category": "exchange",
      "chains": [
        "avalanche",
        "ethereum",
        "kaia",
        "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
}

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/29035.json for the price and payment options.
Pay. Call GET https://open-pay.jp/api/paid/usdc/jpyc/services. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, eip155:5042, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.01 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base, eip155:5042
Demand: 1 calls · 1 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.01	0x52d4901142e2B5680027da5EB47C86CB02a3cA81	300s
exact	eip155:5042 eip155:5042	0x3600000000000000000000000000000000000000	10000	0x52d4901142e2B5680027da5EB47C86CB02a3cA81	604900s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x52d4901142e2B5680027da5EB47C86CB02a3cA81",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:5042",
    "payTo": "0x52d4901142e2B5680027da5EB47C86CB02a3cA81",
    "asset": "0x3600000000000000000000000000000000000000",
    "amount": "10000",
    "maxTimeoutSeconds": 604900
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

Example shape — generated from the schema, not a captured live response

{
  "example": {},
  "type": "string"
}

Examples

curl

curl -X GET 'https://open-pay.jp/api/paid/usdc/jpyc/services'
# -> 402 Payment Required; read PAYMENT-REQUIRED
# retry the identical request with PAYMENT-SIGNATURE

JavaScript

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

Python

import httpx
res = httpx.request("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

Details

Provider: open-pay.jp
Endpoint: https://open-pay.jp/api/paid/usdc/jpyc/services
Machine-readable: /resources/29035.json