The very start of what will likely become an Infura API wrapper gem. Lots TODO still.

infura.rb

### Infura helper class

require "http"
require "json"

class Infura
  NETWORK      = :mainnet
  API_BASE_URL = "https://api.infura.io/v1/jsonrpc/#{Infura::NETWORK}/"

  class << self
    def print_debug label, value
      puts "#{label}:"
      puts "  #{value.inspect}" unless value.nil?
      puts
    end

    def get(method, params: [], debug: false)
      request_url = [Infura::API_BASE_URL, method.to_s].join
      print_debug "Request URL", request_url if debug # DEBUGGING OUTPUT

      headers = {
        content_type: "application/json",
        accept:       "application/json",
        token:        Infura::API_TOKEN,
      }
      print_debug "Headers", headers if debug # DEBUGGING OUTPUT

      data = {
        jsonrpc: "2.0",
        id:      1,
        method:  method,
        params: params.to_json
      }
      print_debug "Data", data if debug # DEBUGGING OUTPUT

      response = HTTP.headers(headers).get(request_url , params: data)
      print_debug "Response", response if debug # DEBUGGING OUTPUT

      result = JSON.parse(response.body)["result"]
      print_debug "Result", result if debug # DEBUGGING OUTPUT

      print_debug ":::END OF DEBUGGING::", nil if debug # DEBUGGING OUTPUT

      result
    end
  end
end

### Usage

Infura::API_TOKEN = "TODO: REPLACE WITH YOUR API TOKEN FROM INFURA.IO"

response = Infura.get(:eth_getBalance,
                      params: [
                        "0x89205A3A3b2A69De6Dbf7f01ED13B2108B2c43e7",
                        "latest"
                      ])

puts response