API api.coinmarketcap.com-bitcoin

Task: Display data from https://api.coinmarketcap.com/v1/ticker/bitcoin/
Pro-Version (date-formatting, shorter code, use of template-manager: much better for future wordpress-updates like the gutenberg-update for wordpress 5.0 – which maybe is a game changer for wordpress):

Template-Manager of the plugin (remember the id of the template):
id: {{_context[0].id}}, price_usd: {{_context[0].price_usd}}, 
{{ attribute(_context[0], '24h_volume_usd') | number_format (2, '.', ',') }}
Shortcode on page:
[jsoncontentimporterpro url=https://api.coinmarketcap.com/v1/ticker/bitcoin/ parser=twig id=NO_OF_TEMPLATE]
In Action: Fetching URL failed: http-errorcode 503