Guides: build something with free APIs

Step-by-step guides that combine free APIs from the directory into something that works: a weather widget, a currency converter, address search, a website check, a chatbot. The code was run before it was published.

Build a weather widget with free APIs

A small web page where a visitor types a city and gets the current weather and a three-day forecast. It uses two free APIs from Open-Meteo, needs no API key…

Build a currency converter with free exchange rate APIs

A converter for a web page or a shop: amounts between currencies at today's rates, without an API key or a server. It uses the European Central Bank rates…

Add address autocomplete and route planning with free APIs

Suggest addresses while a visitor types, then show the driving distance and time between two of them. It uses OpenStreetMap data through Photon and OSRM,…

Check a website's security, HTTPS and speed with free APIs

A short Python script that reports on any website: its security headers, its HTTPS set-up and certificate, the host names in the certificate logs, its last…

Build a chatbot on free AI API tiers

A small chatbot in Python that runs on a free AI tier, from Groq, Google Gemini or OpenRouter, and switches between them by changing one setting, because all…