blockchain.info select value

Challenge: Show data from https://blockchain.info/tobtc?currency=USD&value=500 where USD and value is a parameter
Twig-Code:
{% set js1 = 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ymbol":"SEK"},"SGD":{"15m":109618.3099999999976716935634613037109375,"last":109618.3099999999976716935634613037109375,"buy":109618.3099999999976716935634613037109375,"sell":109618.3099999999976716935634613037109375,"symbol":"SGD"},"THB":{"15m":2781385.58000000007450580596923828125,"last":2781385.58000000007450580596923828125,"buy":2781385.58000000007450580596923828125,"sell":2781385.58000000007450580596923828125,"symbol":"THB"},"TRY":{"15m":3010942.7799999997951090335845947265625,"last":3010942.7799999997951090335845947265625,"buy":3010942.7799999997951090335845947265625,"sell":3010942.7799999997951090335845947265625,"symbol":"TRY"},"TWD":{"15m":2708325.129999999888241291046142578125,"last":2708325.129999999888241291046142578125,"buy":2708325.129999999888241291046142578125,"sell":2708325.129999999888241291046142578125,"symbol":"TWD"},"USD":{"15m":82259.89999999999417923390865325927734375,"last":82259.89999999999417923390865325927734375,"buy":82259.89999999999417923390865325927734375,"sell":82259.89999999999417923390865325927734375,"symbol":"USD"}}' %} {% set shcDosc = (js1 | doshortcode) %} {% set shcArr = (shcDosc | json_decode(TRUE) ) %}
Value:

Result: {{nojsonvalue}}
In the above twig-code is “nameoftemplate=blockchaininfogetcurr”, in there is the URL https://blockchain.info/ticker and this twig
{{ _context | json_encode }}

In Action:

Value:

Result: 0.0060783