I've been reading forums and trying Steam APIs, I'm searching for an API which provides all Steam Games.
I found the API providing all SteamApps, and the Steam Store API which provides information for Apps (I'm looking for the type: 'game'), but for this, I need to call the store API once for each SteamApp... And the Store API is limited to 200 calls every 5 minutes! Is it the only solution?
EDIT:
All Apps API : http://api.steampowered.com/ISteamApps/GetAppList/v0002/?key=STEAMKEY&format=json
App details API : http://store.steampowered.com/api/appdetails?appids={APP_ID}
Answer
A common method here is to cache the results.
So for example, if your using something like PHP to query the results, you would do something like json_encode and json_decode with an array / object to hold the last results.
You can get fancy depending on what you want, but basically you'll need to cache and then perform an update of the oldest.