I need to programmatically generate a bunch of bitcoin addresses and the private keys to them. Later on I am going to fund them with bitcoin.

What are some APIs or libraries I can use to perform this task? I've looked on google but I can't seem to find something that can do this cleanly/easily.

I'm using a blockchain.info wallet. I am building an app and am using the blockchain.info API to send/receive money. I have to test with real money before declaring my app to be functional.

I am using transfers of 1USD for testing.

I just did a send to many transaction from 1 address to 17 receiving addresses. ( $17 dollars to transfer, paid a custom fee of $4 to make sure it don't get stuck ). This worked fine and I guess is acceptable with all the network congestion.

But now I went to transfer the 1USD back into the main wallet, and the fee is about 90% of the value of the transfer ( transfer 1USD, fee is like 90 cents, so I'm left with 10cents after the fee )

Is this normal? Does bitcoin basically outlaw tiny transactions? If so then it will never catch on for everyday purchases.

Imagine going to buy a bottle of water or some candy, and paying $2USD for the item and then an extra $2-$4 USD just for the "privilege" of performing this buy/sell with bitcoin. WTF???

I have a wallet on blockchain.info. I am using their API to do a "send to many" transaction. I am sending bitcoin from my wallet to about 3000 addresses. Around 200USD to each address. I was told that a send to many is counted as a single transaction, not 3000 separate transactions ( true or false? ).

I want to know what an optimal fee to use is so this transaction does not get stuck in limbo or go very slow.

Thanks!!!!