Then consider BTC lotteries. I decided not to call them "instant" (like LTC versions), because BTC confirmation times can be "very not instant".
These lotteries results become available as soon as your transaction gets the 1st confirmation.
And of course they are provably fair - they use block's Merkle root hash, which is unknown until the block is generated.
https://crackthewallet.org/btc/

Tickets are 0.01-0.64 BTC and 0.001-0.064 BTC in mini version. 1st ticket is demo play: try, see results, withdraw back.