Roundhouse AI

Japan Postal Lookup

Japanese postal-code lookup and reverse lookup. Keywords: Japanese postal lookup, Japan Post postal code, postal code reverse lookup, 日本郵便番号検索. Use a postal code or prefecture/city/ward/town components against the local Japan Post snapshot. / 通过邮编或都道府县、市区町村、区、町名字段，在本地 Japan Post 数据中进行日本邮编反查。

OtherLiveeip155:8453Exactvia cdp
https://api.jpverify.com/jp-address/postal-lookup
JapanPostal-codeLookupReverse-lookupJapan-post
Calls · 30d
1↑ 14%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 30 snapshots so far.
$1.41
Verified settled volume
71 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0010
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 2026-09-17 04:04Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xe4A4E5B226bE71e7b6eD523bc7a91089c770572F

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.

Accepts

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

0.001USDC≈ $0.001 USD
on Base · exact scheme

Pay 0.001 USDC on Base to 0xe4A4…0572F. The signed payment is good for 5 minutes.

Paid to
0xe4A4…0572F
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
1000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xe4A4E5B226bE71e7b6eD523bc7a91089c770572F",
    "amount": "1000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "max_results": 10,
          "postal_code": "100-0001"
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "query": {
            "postal_code": "100-0001"
          },
          "status": "matched",
          "matches": [
            {
              "city": "千代田区",
              "kana": "トウキョウトチヨダクチヨダ",
              "town": "千代田",
              "source": "Japan Post local snapshot",
              "confidence": 1,
              "prefecture": "東京都",
              "postal_code": "100-0001"
            }
          ],
          "warnings": [],
          "data_version": null,
          "record_count": 1,
          "candidate_count": 1,
          "postal_code_match": true
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "properties": {
            "body": {
              "type": "object",
              "properties": {
                "city": {
                  "type": [
                    "string",
                    "null"
                  ],
                  "description": "City component. / 市区町村。"
                },
                "town": {
                  "type": [
                    "string",
                    "null"
                  ],
                  "description": "Town or chome component. / 町域・町名。"
                },
                "ward": {
                  "type": [
                    "string",
                    "null"
                  ],
                  "description": "Ward component. / 区。"
                },
                "county": {
                  "type": [
                    "string",
                    "null"
                  ],
                  "description": "County component when applicable. / 郡。"
                },
                "prefecture": {
                  "type": [
                    "string",
                    "null"
                  ],
                  "description": "Prefecture component. / 都道府県。"
                },
                "max_results": {
                  "type": "integer",
                  "default": 10,
                  "maximum": 50,
                  "minimum": 1,
                  "description": "Maximum returned candidates. / 返却候補数の上限。"
                },
                "postal_code": {
                  "type": [
                    "string",
                    "null"
                  ],
                  "pattern": "^\\d{3}-?\\d{4}$",
                  "description": "Japan postal code to expand or verify. / 照合・展開する日本郵便番号。"
                }
              },
              "description": "Provide postal_code or one or more administrative components. / postal_codeまたは行政区・町域の項目を指定します。",
              "additionalProperties": false
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "POST",
                "PUT",
                "PATCH"
              ],
              "type": "string"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object",
              "query": {
                "type": "object"
              },
              "status": {
                "type": "string"
              },
              "matches": {
                "type": "array",
                "items": {
                  "type": "object",
                  "properties": {
                    "city": {
                      "type": "string"
                    },
                    "kana": {
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "town": {
                      "type": "string"
                    },
                    "source": {
                      "type": "string"
                    },
                    "confidence": {
                      "type": "number"
                    },
                    "prefecture": {
                      "type": "string"
                    },
                    "postal_code": {
                      "type": "string"
                    }
                  }
                }
              },
              "warnings": {
                "type": "array",
                "items": {
                  "type": "string"
                }
              },
              "data_version": {
                "type": [
                  "string",
                  "null"
                ]
              },
              "record_count": {
                "type": "integer"
              },
              "candidate_count": {
                "type": "integer"
              },
              "postal_code_match": {
                "type": [
                  "boolean",
                  "null"
                ]
              }
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-09-17 04:04Z
Last indexed by Roundhouse
2026-09-24 15:30Z
Last enriched (probe, favicon, geo)
2026-09-23 09:15Z
x402 version
2
Max timeout
300s
Liveness probe
HTTP 405
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. 30 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 Japan Postal Lookup 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=Japan%20Postal%20Lookup'
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://api.jpverify.com/jp-address/postal-lookup, 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.