Blockcypher and genesis block

Shouldn't the height of genesis block be zero?
If I type 0 on Blockcypher, it will return a error:

Code:

Server Error (500)

It seems that Blockcypher put the genesis block on height 1, thus makes the true block#1 inaccesible (unless specify sha256 directly: 00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048).