Documentation

Factline answers questions about Dutch addresses, neighbourhoods and vehicles with figures from Dutch government open data, in English. Every figure carries its source and year.

Use it in Claude or ChatGPT

Add a custom connector with this URL: https://factline.dev/mcp/chat. No login needed.

`nl_home_basic`	Facts about one address: year built, floor area, use, neighbourhood headline, liveability.
`nl_neighbourhood_summary`	Headline facts about the neighbourhood around a postcode: home values, crime vs national rate, distances to shops, GP, school, station.
`nl_vehicle_basic`	Licence plate check: make, model, age, APK expiry, insurance, open recall, odometer verdict.

Try: “What is the neighbourhood like around 2517AS?” · “When does the APK of GT-722-F expire?” · “When was Visschersplein 1 in Utrecht built?”

For developers and AI agents

REST and MCP with pay-per-call in USDC (x402). See llms.txt, the catalog and OpenAPI. Agent MCP endpoint: https://factline.dev/mcp.

Limits

Free use is limited to 30 requests per minute. Neighbourhood figures are CBS neighbourhood averages, not for the individual home. No personal data: no owners and no individual property values.