Belgian Secondhand Search Chatbot in n8n (Koopje.ai + OpenRouter)

Find Belgian secondhand deals instantly with a chatbot in n8n (Koopje.ai + OpenRouter)

This n8n workflow powers a Dutch-language search chatbot that looks up Belgian secondhand listings and auction lots via koopje.ai, using an OpenRouter chat model to understand your request and refine search queries—then replies with matching results and direct links.

What this workflow does

• Receives your message via the n8n Chat trigger (in the workflow’s Dutch conversation flow).
• Understands your intent using an OpenRouter Chat Model with a Dutch system prompt to turn your request into a focused query (e.g., item type, desired budget, optional location).
• Searches Belgian listings through the koopje.ai /v1/search endpoint and returns results including title, price (or auction house), location, source, and the listing URL.
• Fetches full listing details only when needed by calling koopje.ai /v1/contents for up to five selected URLs to retrieve the full text/details.
• Maintains context across messages using conversation memory, so follow-up questions can refine results.
• Responds in Dutch with per-result price, place, and the original link.

Use cases

• “Find me a gaming laptop under €300 in Belgium” — get curated matches with direct links.
• Compare secondhand options across sources like 2dehands.be, markplaats.nl, vavato.com, troc.com, troostwijkauctions.com, zoekertjes.be, auctelia.com, vlavem.com, and more (via koopje.ai).
• Ask a follow-up such as “Only show listings in Antwerp” or “What details are written for the top results?”—the chatbot can fetch extra content for selected URLs.

Technical details

• n8nn8n-nodes-langchainchat trigger (chat entry)
• n8nn8n-nodes-langchainlm chat open router (OpenRouter model)
• HTTP Request Tool (calls koopje.ai with your Bearer API key using /v1/search and optional /v1/contents)
• n8nn8n-nodes-langchainmemory buffer window (conversation memory)

Setup summary: create a koopje.ai account, generate an API key, add it to n8n as Bearer Auth, select an OpenRouter Chat Model you have access to, then open the n8n Chat interface and start searching for deals.