What’s in the pump.ex around line 4 where the error is?

Thanks for your patient and detailed explanation. I used it to rework the code as follows:

def get_trading_activity do

 		case HTTPoison.get("https://api.wavesplatform.com/v0/pairs") do
			{:ok, _} ->
			results = HTTPoison.get!("https://api.wavesplatform.com/v0/pairs")

			json_into_atoms = Poison.decode!(results.body, keys: :atoms)
			

		#Exclude all pairs with volumeWAVES < 500

			Enum.filter(json_into_atoms.data, fn pairs -> pairs.data.volumeWaves >= 500.0 end)
    			
	
			{:error, %HTTPoison.Error{reason: reason}} ->
 			
			IO.inspect reason

		end
end

Thanks again!

Is there any reason you do that request at compile time?

If you really want to do that, you need to Application.ensure_started/1 for applications you need runtime features off.

Also most of the apps you specified in :extra_applications don’t belong there as they have been inferred by mix anyway because they are in deps.

Ah shoot I totally missed that. Yeah, that’s the reason, the applications like HTTpoison are not started at compile time. The whole code probably should be within some function.