how to translate curl to elixir httpoison - rest

Question

I have an example curl command from an api:
curl -sd '{"inputs":[{"addresses": ["add42af7dd58b27e1e6ca5c4fdc01214b52d382f"]}],"outputs":[{"addresses": ["884bae20ee442a1d53a1d44b1067af42f896e541"], "value": 4200000000000000}]}' https://api.blockcypher.com/v1/eth/main/txs/new?token=YOURTOKEN
I have no idea how to translate this into HTTPoison for Elixir. I've been trying for hours. I can't even begin to mention all the iterations I've gone through, but here's where I'm at now:
Connect.post( "https://api.blockcypher.com/v1/eth/main/txs/new?token=#{#token}",
"",
[
{ "inputs", "{addresses, #{address_from}}"},
{ "outputs", "[{addresses, #{address_to}}, {value, #{eth_amount}}]"}
]
)
unlike most everything I've tried before this actually gets to their servers and gives a response:
"{\"error\": \"Couldn't deserialize request: EOF\"}"
%{"error" => "Couldn't deserialize request: EOF"}
** (FunctionClauseError) no function clause matching in Base.encode16/2
(elixir) lib/base.ex:175: Base.encode16(nil, [])
(blockcypher) lib/blockcypher/handler.ex:55: Blockcypher.Handler.post_transa
ction_new/4
iex(46)>
can you help me out? I tried putting the data in the body portion instead of the headers but with no luck.

Answer 1

The data should be the second argument to HTTPoison.post/2 and should be encoded to JSON. Your data is also in the wrong format.
This should work:
Connect.post(
"https://api.blockcypher.com/v1/eth/main/txs/new?token=#{#token}",
"",
Poison.encode!(
%{"inputs" => [%{"addresses" => [address_from]}],
"outputs" => [%{"addresses" => [address_to],
"value" => eth_amount}]})
)