# Factline Energy Label Lookup

> Factline Energy Label Lookup is a paid API for AI agents from factline.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-11).

Returns the officially registered Dutch energy label (A++++ to G), registration date, expiry date, and building type for any Dutch address by postcode and house number, sourced from RVO EP-Online.

## Facts

- Endpoint: GET https://factline.dev/v1/energy-label?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/factline-energy-label-lookup-2e44686f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FnDJMVg-qgzfpGFCHOpgf

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 factline-energy-label-lookup-2e44686f
```

Example prompt: What is the official energy label registered for Visschersplein 1 in Utrecht — postcode 3511LX? I need the label rating, when it was registered, and when it expires.

## When to prefer this

Use this endpoint when you need the officially government-registered Dutch energy label for a specific residential or commercial address, sourced from RVO EP-Online. Prefer this over general property lookup endpoints when energy compliance, label rating, or certificate validity is the primary concern. Ideal for real estate agents, property buyers, landlords, sustainability analysts, or compliance workflows focused on Netherlands addresses.

## Known failure modes

- Invalid or malformed postcode format returns a validation error
- House number not found at the given postcode returns 'none registered'
- Address exists but has no energy label registered returns 'none registered'
- RVO EP-Online upstream unavailability may cause timeout or 503 error
- Ambiguous address without house number addition may return multiple or incorrect results

## How this service works

API and MCP servers that let AI agents and apps check people, companies, Dutch addresses and cars against official records: sanctions and PEP lists, 10 company registers, Dutch property, rent and RDW vehicle data. From $0.001 per call.

## Output

Returns the officially registered energy label (e.g. A++, B, C … G), the registration date, the expiry date, and the building type for the queried Dutch address. If no label is registered, returns a clear 'none registered' response. Data sourced directly from RVO EP-Online.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "q": {
       "type": "string",
       "description": "Alternative to postcode: free-text address, e.g. 'Visschersplein 1 Utrecht'"
      },
      "addition": {
       "type": "string",
       "description": "Optional house number addition, e.g. 2 or BIS"
      },
      "postcode": {
       "type": "string",
       "pattern": "^[1-9][0-9]{3} ?[A-Za-z]{2}$",
       "description": "Dutch postcode, 4 digits + 2 letters, e.g. 3511LX"
      },
      "house_letter": {
       "type": "string",
       "description": "Optional house letter, e.g. A"
      },
      "house_number": {
       "type": "integer",
       "minimum": 1,
       "description": "House number, e.g. 1"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "source": "RVO EP-Online",
  "address": {
   "city": "'s-Gravenhage",
   "label": "Laan van Meerdervoort 100, 2517AS 's-Gravenhage",
   "postcode": "2517AS",
   "house_number": 100,
   "bag_object_id": "0518010001775699"
  },
  "energy_label": {
   "label": "A",
   "inspected": "2020-12-30",
   "registered": "2020-12-31",
   "valid_until": "2030-12-30",
   "energy_index": 1.02,
   "building_type": "Flatwoning (overig)",
   "simplified_label": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/factline-energy-label-lookup-2e44686f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from factline.dev](https://www.zero.xyz/host/factline.dev/llms.txt)