Q:

Litecoin difficulty and reward

How can I know difficulty value and reward for Litecoin network ? 
I'm looking for website such as 

http://blockexplorer.com/q/bcperblock 
http://blockexplorer.com/q/getdifficulty

to get difficulty and reward for Litecoin network (instead of Bitcoin network)
I'm looking for a way to get difficulty and reward using an API that can be queried every 15 minutes to make my own mining profit calculator. 
Current difficulty is around 100 and current reward is 25 LTC. 

A:

The latest version of Abe supports getdifficulty, so you could run it yourself or convince the explorer administrator to upgrade.   But this will be the difficulty as of the last solved block.   I would expect "litecoind getinfo" to give a more accurate number during difficulty adjustments, and this does not require Abe or a website. 
As for the block reward, Abe lacks bcperblock.   Perhaps the easiest route is to get the current block number (also available via getinfo) and calculate the reward.   According to litecoin.org, the reward starts at 50 LTC and is halved every 840,000 blocks.   In Python:
def reward(blocknumber):
    return 50.0 / (2 ** int((blocknumber + 1) / 840000))

Adding 1 to the block number gives you the next block's reward, which is what matters to miners.