# Dutch Postcode Lookup API (CBS Open Data Proxy)

> Dutch Postcode Lookup API (CBS Open Data Proxy) is a paid API for AI agents from cbs.thesoulnetwork.eu, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-29).

Resolves a Dutch postcode and house number to full address details including street, city, municipality, province, and coordinates.

## Facts

- Endpoint: GET https://cbs.thesoulnetwork.eu/postcode?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dutch-postcode-lookup-api-cbs-open-data-proxy-97969e40
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UU6lsJHbT1TRcQ_C3SFfb

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-postcode-lookup-api-cbs-open-data-proxy-97969e40
```

Example prompt: Can you look up the address details for Dutch postcode 1012AB, house number 1? I need the street, city, municipality, province, and coordinates.

## When to prefer this

Choose this endpoint when you need to resolve or validate Dutch (Netherlands) postcodes to full address data including geocoordinates, municipality, and province. It is pay-per-call at $0.01 USDC via x402 on Base Mainnet, making it ideal for low-volume or on-demand lookups without a subscription. Prefer this over generic geocoding APIs when you specifically need Dutch CBS-sourced address data with municipality and province breakdown.

## Known failure modes

- Invalid or non-existent postcode returns valid: false or empty fields
- Missing required query parameters (code or number) returns a 400-level error
- Payment failure over x402 protocol prevents the call from completing
- Postcode format incorrect (not Dutch 4-digit + 2-letter format) may return no results

## How this service works

Pay $0.01 USDC per call to validate IBANs, EU VAT numbers and Dutch postcodes, and to query CBS housing, company, domain and EU sanctions data on Base Mainnet.

## Output

A JSON object containing: whether the postcode is valid, the resolved street name, city, municipality, province, house number, and lat/lon coordinates. Example: {city: 'Amsterdam', street: 'Stadhouderskade', province: 'Noord-Holland', municipality: 'Amsterdam', lat_lon: '52.3633,4.8823', valid: true}.

## Request schema (JSON Schema)

```json
{
 "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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "code",
      "number"
     ],
     "properties": {
      "code": {
       "type": "string"
      },
      "number": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {}
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "city": "Amsterdam",
  "input": "1012AB",
  "valid": true,
  "street": "Stadhouderskade",
  "lat_lon": "52.3633,4.8823",
  "province": "Noord-Holland",
  "houseNumber": "1",
  "municipality": "Amsterdam"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/dutch-postcode-lookup-api-cbs-open-data-proxy-97969e40/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from cbs.thesoulnetwork.eu](https://www.zero.xyz/host/cbs.thesoulnetwork.eu/llms.txt)