I like it, though I got around curl's painful syntax by wrapping it in a few shell script. For example, here's my api_post script (meant to be used like "api_post users/123 first_name=Foo last_name=Bar") (pardon my incompetent shell scripting and redaction of company internals):

  #!/bin/sh
  
  resource="$1"
  shift
  
  declare -a post
  while [ "$1" ]; do
      post=("${post[@]}" "-F" "$1")
      shift
  done
  
  if [ -z "${API_BASE:=}" ]; then
      API_BASE=http://localhost:3000/api/v1/
      echo "No API_BASE set.  Using $API_BASE."
  fi
  
  verbose=""
  [ -n "$API_VERBOSE" ] && verbose="-v"
  
  if [ -z "${API_COOKIES:=}" ]; then
      cookies=~/.api.cookies
  else
      cookies="$API_COOKIES"
  fi
  
  curl -0 -k -s -S $verbose -b "$cookies" -c "$cookies" -X POST "${post[@]}" "${API_BASE}${resource}"