Japan Government Open Data Catalogue Search (e-Gov Data Portal)

egovdata/search-japan-open-datasets

Search the Japanese central-government open data catalogue (e-Gov Data Portal) for datasets by keyword: each result is a catalogue record with its title, publishing organisation, licence fields, update frequency and the format and link of every resource, plus the total number of matches. Page size is required; page through with a start offset. Catalogue metadata and resource links only: the datasets' files are not fetched or returned. The catalogue lists records from many publishers whose own terms differ, so check the publisher's terms before reusing the data behind a link. Mostly Japanese-language metadata, passed through unmodified. 出典：e-Govデータポータル（https://data.e-gov.go.jp）, デジタル庁, PDL 1.0. Served by Eden Engine; not an official Digital Agency product.

activeper callv1

Price

$0.0026 per call

You pay the price shown. If a call turns out to cost more than its quote, you pay the actual price, capped at twice the quote. No monthly minimum. Top-ups start at $5.

Data source

e-Gov Data Portal

出典：e-Govデータポータル（https://data.e-gov.go.jp）, デジタル庁. Content is published under the Public Data License 1.0 (PDL 1.0) unless a rights notice says otherwise. Each dataset record is from its own publisher: check the publisher's terms before reusing the data behind a link. Served by Eden Engine; not an official Digital Agency product.

Use it

Five steps: search, inspect, learn, run, settle. No per-tool setup; your agent reaches this tool through the meta-tools it already has.

Connect once and your AI can find and run this tool, and any other it needs.

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agent

// 1. search: find the tool
omnial_search({ query: "what you need" })

// 2. inspect: price and input schema
omnial_inspect({ tool: "egovdata/search-japan-open-datasets" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "egovdata/search-japan-open-datasets" })

// 4. run: price the exact call first, then run it
omnial_execute({ tool: "egovdata/search-japan-open-datasets", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "egovdata/search-japan-open-datasets", input: { /* ... */ } })

// 5. settle: the call is charged when it finishes, nothing to do

Not connected yet? Point your MCP client at https://mcp.eden-engine.com/mcp, then copy a config for your client.

Pricing

Every charge this tool can incur.

Charge	Price
Per call	$0.0026

Updated: Oct 20, 2026

Input and output schemas

Input schema

input_schema.json

{
  "type": "object",
  "required": [
    "rows"
  ],
  "properties": {
    "q": {
      "type": "string",
      "maxLength": 200,
      "minLength": 1,
      "description": "Keyword query, for example 祝日 or population. Leave out to list records from the top of the catalogue. Most records are described in Japanese."
    },
    "rows": {
      "type": "integer",
      "maximum": 25,
      "minimum": 1,
      "description": "How many catalogue records to return, 1 to 25."
    },
    "start": {
      "type": "integer",
      "minimum": 0,
      "description": "Zero-based offset of the first record returned, for paging: 0 for the first page, then the page size, and so on. Leave out for the first page."
    }
  },
  "additionalProperties": false
}

Output schema

output_schema.json

{
  "type": "object",
  "required": [
    "count",
    "results"
  ],
  "properties": {
    "sort": {
      "type": "string",
      "description": "The sort order applied."
    },
    "count": {
      "type": "integer",
      "description": "Total number of matching datasets, not just this page."
    },
    "facets": {
      "type": "object",
      "additionalProperties": true
    },
    "results": {
      "type": "array",
      "items": {
        "type": "object",
        "additionalProperties": true
      },
      "description": "Catalogue records, best match first (`sort` reads 'score desc, metadata_modified desc'). Each has `id`, `name`, `title`, `notes`, `organization` (with `title` and `description`), `license_id`, `license_title`, `isopen`, `landingPage`, `frequency_of_update`, `metadata_modified` and `resources`, each resource with `format`, `url`, `size`, `license_id` and `name`. Many text fields are empty strings."
    },
    "highlighting": {
      "type": "object",
      "additionalProperties": true
    },
    "search_facets": {
      "type": "object",
      "additionalProperties": true
    }
  },
  "description": "The catalogue search result: `count` is the number of matching datasets in total, `results` holds this page of catalogue records.",
  "additionalProperties": true
}