That ' s why the almost is there As them being exactly in line is highly unlikely . <| sep |> Expected behaviour . No harm . But it ' s good people have eyes on . Gav Wood gavofyork 1041 NOTE beta versions of Parity are , by default , configured to accept the best paying transactions . If the block gas limit is not fully utilised by paying transactions , then zero gas price transactions will be included to fill up the remainder . This is much the same as other blockchain networks , notably Bitcoin . Core developers including Vitalik are agreed it does not constitute any kind of issue or attack . That said , if you would prefer to insist on a minimum transaction gas price , this can be configured with usdpertx . <| sep |> You mean ARGs ? Valve has done those in the past .