Dutch Cadastre Knowledge Graph: SPARQL Query (Kadaster)

kadasterkkgsparql/sparql-query

Runs a read-only SPARQL SELECT query against the Kadaster Knowledge Graph, the Dutch Kadaster's linked-data publication of addresses and buildings (BAG), large-scale topography (BGT), Top10NL (BRT), the open part of the cadastre (BRK), public-law restrictions and CBS neighbourhood areas, on the IMX-Geo model. You write the SPARQL; the answer is a list of rows, one object per solution, with each selected variable as a string (a URI or a literal). The query must end with LIMIT n (1 to 1000), optionally followed by OFFSET m; page with OFFSET. SELECT only, at most 2000 characters. An empty answer is a valid empty list. The service is described by the Kadaster as experimental. Kadaster data as served by Eden Engine; not an official Kadaster 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

Kadaster

Data from the Kadaster Knowledge Graph (Kadaster, the Netherlands), published at data.labs.kadaster.nl. Served by Eden Engine; not an official Kadaster 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: "kadasterkkgsparql/sparql-query" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "kadasterkkgsparql/sparql-query" })

// 4. run: price the exact call first, then run it
omnial_execute({ tool: "kadasterkkgsparql/sparql-query", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "kadasterkkgsparql/sparql-query", 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": [
    "query"
  ],
  "properties": {
    "query": {
      "type": "string",
      "pattern": "^(?=[\\s\\S]*\\b[Ss][Ee][Ll][Ee][Cc][Tt]\\b)[\\s\\S]*\\b[Ll][Ii][Mm][Ii][Tt]\\s+([1-9][0-9]{0,2}|1000)(\\s+[Oo][Ff][Ff][Ss][Ee][Tt]\\s+[0-9]{1,7})?\\s*$",
      "maxLength": 2000,
      "minLength": 20,
      "description": "A SPARQL SELECT query of at most 2000 characters that ends with LIMIT n (n from 1 to 1000), optionally followed by OFFSET m, for example SELECT * WHERE {?s ?p ?o} LIMIT 1. The LIMIT is required because the graph holds over a billion statements and the service has no paging parameter; page with OFFSET. A query without it, or one that is not a SELECT, is refused before any call is made; a query the SPARQL parser rejects is refused as invalid."
    }
  },
  "additionalProperties": false
}

Output schema

output_schema.json

{
  "type": "object",
  "required": [
    "results"
  ],
  "properties": {
    "results": {
      "type": "array",
      "items": {
        "type": "object",
        "additionalProperties": true
      },
      "description": "One object per solution, keyed by the query's selected variable names; each value is a string (a URI or a literal)."
    }
  },
  "description": "The solutions of the SELECT query.",
  "additionalProperties": false
}