Your node keeps unconfirmed transactions in its mempool. In order to protect the node from spam, it is best to set a minimum gas price that the transaction must meet in order to be accepted into the mempool.
This setting can be found in the following file and we will change the default value which is blank.
vi ~/.akash/config/app.toml
The initial recommended min-gas-prices is 0.025uakt but you might want to change it later.
# This is a TOML config file.
# For more information, see https://github.com/toml-lang/toml
##### main base config options #####
# The minimum gas prices a validator is willing to accept for processing a
# transaction. A transaction's fees must meet the minimum of any denomination
# specified in this config (e.g. 10uatom).
minimum-gas-prices = "0.025uakt"