# Dutch BAG Building Lookup by Postcode + House Number

> Dutch BAG Building Lookup by Postcode + House Number is a paid API for AI agents from api.agenticweb.nl, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).

Returns construction year, floor area, use function, and status for a Dutch building using BAG data, identified by postcode and house number.

## Facts

- Endpoint: POST https://api.agenticweb.nl/api/v1/nl/building
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dutch-bag-building-lookup-by-postcode-house-number-97a3d7e5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_s5iEirNEMn13oXyYSVgYJ

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability dutch-bag-building-lookup-by-postcode-house-number-97a3d7e5 -d '<json body>'
```

Example prompt: What does the Dutch building registry say about the property at postcode 2511BX, house number 1? I need the construction year, floor area, and official use function.

## When to prefer this

Use this endpoint when you need official Dutch building attributes (construction year, floor area, use function, status) from the authoritative BAG registry for a known postcode and house number. Prefer this over the address lookup endpoint when building-specific attributes matter rather than geographic coordinates. Best suited for property due diligence, real estate enrichment, compliance checks, or any workflow requiring verified building metadata for Dutch addresses.

## Known failure modes

- Postcode or house number not found in BAG — returns 404 or empty result
- Invalid postcode format causes validation error
- Building exists but has no floor area recorded (some buildings lack oppervlakte)
- Payment not processed — request rejected before lookup
- House number addition required to disambiguate but not provided, returning wrong unit

## How this service works

Dutch building (BAG) lookup by postcode + house number: construction year, floor area, use function, status. Send the parameters in a JSON request body via POST. Payment constitutes acceptance of the terms at https://agenticweb.nl/terms.

## Output

Returns structured BAG data for the specified building including: construction year (bouwjaar), official floor area in m² (oppervlakte), use function (gebruiksfunctie, e.g. woonfunctie/kantoorsfunctie), and registration status (status) of the building object.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "postcode": {
   "type": "string",
   "description": "Dutch postcode, e.g. 1011AC."
  },
  "huisnummer": {
   "type": "number",
   "description": "House number."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/dutch-bag-building-lookup-by-postcode-house-number-97a3d7e5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.agenticweb.nl](https://www.zero.xyz/host/api.agenticweb.nl/llms.txt)