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 = '{"ARS":{"15m":5322812.809999999590218067169189453125,"last":5322812.809999999590218067169189453125,"buy":5322812.809999999590218067169189453125,"sell":5322812.809999999590218067169189453125,"symbol":"ARS"},"AUD":{"15m":25116.31000000000130967237055301666259765625,"last":25116.31000000000130967237055301666259765625,"buy":25116.31000000000130967237055301666259765625,"sell":25116.31000000000130967237055301666259765625,"symbol":"AUD"},"BRL":{"15m":88649.039999999993597157299518585205078125,"last":88649.039999999993597157299518585205078125,"buy":88649.039999999993597157299518585205078125,"sell":88649.039999999993597157299518585205078125,"symbol":"BRL"},"CAD":{"15m":22973.56000000000130967237055301666259765625,"last":22973.56000000000130967237055301666259765625,"buy":22973.56000000000130967237055301666259765625,"sell":22973.56000000000130967237055301666259765625,"symbol":"CAD"},"CHF":{"15m":15826.0400000000008731149137020111083984375,"last":15826.0400000000008731149137020111083984375,"buy":15826.0400000000008731149137020111083984375,"sell":15826.0400000000008731149137020111083984375,"symbol":"CHF"},"CLP":{"15m":14901510.49000000022351741790771484375,"last":14901510.49000000022351741790771484375,"buy":14901510.49000000022351741790771484375,"sell":14901510.49000000022351741790771484375,"symbol":"CLP"},"CNY":{"15m":121109.419999999998253770172595977783203125,"last":121109.419999999998253770172595977783203125,"buy":121109.419999999998253770172595977783203125,"sell":121109.419999999998253770172595977783203125,"symbol":"CNY"},"CZK":{"15m":391139.650000000023283064365386962890625,"last":391139.650000000023283064365386962890625,"buy":391139.650000000023283064365386962890625,"sell":391139.650000000023283064365386962890625,"symbol":"CZK"},"DKK":{"15m":118592.64999999999417923390865325927734375,"last":118592.64999999999417923390865325927734375,"buy":118592.64999999999417923390865325927734375,"sell":118592.64999999999417923390865325927734375,"symbol":"DKK"},"EUR":{"15m":16020.639999999999417923390865325927734375,"last":16020.639999999999417923390865325927734375,"buy":16020.639999999999417923390865325927734375,"sell":16020.639999999999417923390865325927734375,"symbol":"EUR"},"GBP":{"15m":13831.95000000000072759576141834259033203125,"last":13831.95000000000072759576141834259033203125,"buy":13831.95000000000072759576141834259033203125,"sell":13831.95000000000072759576141834259033203125,"symbol":"GBP"},"HKD":{"15m":130749.3099999999976716935634613037109375,"last":130749.3099999999976716935634613037109375,"buy":130749.3099999999976716935634613037109375,"sell":130749.3099999999976716935634613037109375,"symbol":"HKD"},"HRK":{"15m":126458.25,"last":126458.25,"buy":126458.25,"sell":126458.25,"symbol":"HRK"},"HUF":{"15m":6242979.440000000409781932830810546875,"last":6242979.440000000409781932830810546875,"buy":6242979.440000000409781932830810546875,"sell":6242979.440000000409781932830810546875,"symbol":"HUF"},"INR":{"15m":1379124.5200000000186264514923095703125,"last":1379124.5200000000186264514923095703125,"buy":1379124.5200000000186264514923095703125,"sell":1379124.5200000000186264514923095703125,"symbol":"INR"},"ISK":{"15m":2558484.2799999997951090335845947265625,"last":2558484.2799999997951090335845947265625,"buy":2558484.2799999997951090335845947265625,"sell":2558484.2799999997951090335845947265625,"symbol":"ISK"},"JPY":{"15m":2313712.0299999997951090335845947265625,"last":2313712.0299999997951090335845947265625,"buy":2313712.0299999997951090335845947265625,"sell":2313712.0299999997951090335845947265625,"symbol":"JPY"},"KRW":{"15m":22491758.1600000001490116119384765625,"last":22491758.1600000001490116119384765625,"buy":22491758.1600000001490116119384765625,"sell":22491758.1600000001490116119384765625,"symbol":"KRW"},"NZD":{"15m":26546.13000000000101863406598567962646484375,"last":26546.13000000000101863406598567962646484375,"buy":26546.13000000000101863406598567962646484375,"sell":26546.13000000000101863406598567962646484375,"symbol":"NZD"},"PLN":{"15m":75218.66000000000349245965480804443359375,"last":75218.66000000000349245965480804443359375,"buy":75218.66000000000349245965480804443359375,"sell":75218.66000000000349245965480804443359375,"symbol":"PLN"},"RON":{"15m":74554.039999999993597157299518585205078125,"last":74554.039999999993597157299518585205078125,"buy":74554.039999999993597157299518585205078125,"sell":74554.039999999993597157299518585205078125,"symbol":"RON"},"RUB":{"15m":1064312.80000000004656612873077392578125,"last":1064312.80000000004656612873077392578125,"buy":1064312.80000000004656612873077392578125,"sell":1064312.80000000004656612873077392578125,"symbol":"RUB"},"SEK":{"15m":175200.369999999995343387126922607421875,"last":175200.369999999995343387126922607421875,"buy":175200.369999999995343387126922607421875,"sell":175200.369999999995343387126922607421875,"symbol":"SEK"},"SGD":{"15m":22939.95000000000072759576141834259033203125,"last":22939.95000000000072759576141834259033203125,"buy":22939.950000000000727595761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%}
{% 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: 0.02974242