Roundhouse AI

open-pay.jp

OpenPayは、日本円ステーブルコインJPYC・USDC対応の店舗向け決済インフラ。QR決済からモバイルオーダー・受注・電子レシート・会計、AIエージェント決済まで手数料0〜1%（時間指定の事前注文のみ3%）。売上はウォレットへ直接着金（ノンカストディ）。導入費0円・契約不要・オープンソース。

SearchLiveeip155:8453Exactvia cdp
https://open-pay.jp/api/paid/usdc/japan-web3-directory/search
Calls · 30d
1↓ 43%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 26 snapshots so far.
$0.53
Verified settled volume
54 settlements proven x402 by their on-chain EIP-3009 marker.
$0.020
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-08-21 03:35Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x52d4901142e2B5680027da5EB47C86CB02a3cA81

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "error": "payment_required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x52d4901142e2B5680027da5EB47C86CB02a3cA81",
      "scheme": "exact",
      "network": "base",
      "mimeType": "application/json",
      "resource": "https://open-pay.jp/api/paid/usdc/japan-web3-directory/search",
      "description": "Filter the Japan Web3 Directory by category, token, chain or capability — the same sourced, date-stamped records as the full export, without pulling rows your agent doesn't need.",
      "outputSchema": {
        "input": {
          "type": "http",
          "method": "GET",
          "discoverable": true
        }
      },
      "maxAmountRequired": "20000",
      "maxTimeoutSeconds": 300
    }
  ],
  "x402Version": 1
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.02USDC≈ $0.02 USD
on Base · exact scheme

Pay 0.02 USDC on Base to 0x52d4…3cA81. The signed payment is good for 5 minutes.

Paid to
0x52d4…3cA81
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
20000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x52d4901142e2B5680027da5EB47C86CB02a3cA81",
    "amount": "20000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "chain": "polygon",
          "limit": "20",
          "token": "jpyc",
          "category": "exchange"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "items": [
            {
              "name": "JPYC EX",
              "slug": "jpyc-ex",
              "facts": {
                "tags": [
                  "Japan",
                  "issuance",
                  "redemption"
                ],
                "chains": [
                  "avalanche",
                  "ethereum",
                  "polygon"
                ],
                "tokens": [
                  "jpyc"
                ],
                "category": "exchange",
                "supportsMcp": false,
                "supportsJpyc": true,
                "supportsUsdc": false,
                "supportsX402": false
              },
              "nameJa": "JPYC EX",
              "status": "published",
              "sourceOk": true,
              "editorial": {
                "summaryEn": "The official starting point for JPYC issuance and redemption."
              },
              "sourceUrl": "https://jpyc.co.jp/",
              "sourceType": "official",
              "verifiedAt": "2026-07-13",
              "sourceCheckedAt": "2026-08-20T01:27:11.803Z"
            }
          ],
          "query": {
            "limit": 20,
            "offset": 0
          },
          "total": 19,
          "generatedAt": "2026-08-21T00:32:38.608Z",
          "schemaVersion": "1.0"
        }
      }
    },
    "schema": {
      "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"
              ],
              "type": "string"
            },
            "queryParams": {
              "type": "object",
              "properties": {
                "chain": {
                  "enum": [
                    "arbitrum",
                    "avalanche",
                    "base",
                    "ethereum",
                    "kaia",
                    "optimism",
                    "polygon"
                  ],
                  "type": "string"
                },
                "limit": {
                  "type": "string",
                  "description": "1-50 (default 20)"
                },
                "token": {
                  "enum": [
                    "jpyc",
                    "usdc"
                  ],
                  "type": "string"
                },
                "offset": {
                  "type": "string",
                  "description": "0-1000 (default 0)"
                },
                "keyword": {
                  "type": "string",
                  "maxLength": 100,
                  "description": "Free-text match on name/summary"
                },
                "category": {
                  "enum": [
                    "api",
                    "bridge",
                    "developer-tool",
                    "exchange",
                    "network",
                    "payment",
                    "stablecoin",
                    "wallet"
                  ],
                  "type": "string"
                },
                "language": {
                  "enum": [
                    "en",
                    "ja"
                  ],
                  "type": "string"
                },
                "supportsMcp": {
                  "enum": [
                    "true",
                    "false"
                  ],
                  "type": "string"
                },
                "supportsJpyc": {
                  "enum": [
                    "true",
                    "false"
                  ],
                  "type": "string"
                },
                "supportsUsdc": {
                  "enum": [
                    "true",
                    "false"
                  ],
                  "type": "string"
                },
                "supportsX402": {
                  "enum": [
                    "true",
                    "false"
                  ],
                  "type": "string"
                }
              },
              "additionalProperties": false
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object"
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-08-21 03:35Z
Last indexed by Roundhouse
2026-09-20 03:40Z
Last enriched (probe, favicon, geo)
2026-09-24 08:45Z
x402 version
2
Max timeout
300s
Liveness probe
HTTP 402
Report

Hand this page to an agent

Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.

GET api.roundhouseai.io/v0/endpoints

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 26 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md
Show the prompt
Using Roundhouse, look up the x402 service open-pay.jp and tell me whether it is
worth paying: what a call costs, whether the endpoint answered when last probed, and what
its payment record actually shows.

curl -s 'https://api.roundhouseai.io/v0/endpoints?q=open-pay.jp'
curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>'

Then call it: read the price from the live 402 at https://open-pay.jp/api/paid/usdc/japan-web3-directory/search, never from
a cached figure, and pay with an x402 client.

The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except
/v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402,
or use an organization key from https://roundhouseai.io/dashboard/team.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.