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 = '{"USD":{"15m":62912.0999999999985448084771633148193359375,"last":62912.0999999999985448084771633148193359375,"buy":62912.0999999999985448084771633148193359375,"sell":62912.0999999999985448084771633148193359375,"symbol":"$"},"AUD":{"15m":81338.360000000000582076609134674072265625,"last":81338.360000000000582076609134674072265625,"buy":81338.360000000000582076609134674072265625,"sell":81338.360000000000582076609134674072265625,"symbol":"$"},"BRL":{"15m":353338.2700000000186264514923095703125,"last":353338.2700000000186264514923095703125,"buy":353338.2700000000186264514923095703125,"sell":353338.2700000000186264514923095703125,"symbol":"R$"},"CAD":{"15m":78976.199999999997089616954326629638671875,"last":78976.199999999997089616954326629638671875,"buy":78976.199999999997089616954326629638671875,"sell":78976.199999999997089616954326629638671875,"symbol":"$"},"CHF":{"15m":58054.02999999999883584678173065185546875,"last":58054.02999999999883584678173065185546875,"buy":58054.02999999999883584678173065185546875,"sell":58054.02999999999883584678173065185546875,"symbol":"CHF"},"CLP":{"15m":43944087.64000000059604644775390625,"last":43944087.64000000059604644775390625,"buy":43944087.64000000059604644775390625,"sell":43944087.64000000059604644775390625,"symbol":"$"},"CNY":{"15m":410797.150000000023283064365386962890625,"last":410797.150000000023283064365386962890625,"buy":410797.150000000023283064365386962890625,"sell":410797.150000000023283064365386962890625,"symbol":"\u00a5"},"DKK":{"15m":391255.7700000000186264514923095703125,"last":391255.7700000000186264514923095703125,"buy":391255.7700000000186264514923095703125,"sell":391255.7700000000186264514923095703125,"symbol":"kr"},"EUR":{"15m":52717.2399999999979627318680286407470703125,"last":52717.2399999999979627318680286407470703125,"buy":52717.2399999999979627318680286407470703125,"sell":52717.2399999999979627318680286407470703125,"symbol":"\u20ac"},"GBP":{"15m":45725.5199999999967985786497592926025390625,"last":45725.5199999999967985786497592926025390625,"buy":45725.5199999999967985786497592926025390625,"sell":45725.5199999999967985786497592926025390625,"symbol":"\u00a3"},"HKD":{"15m":488694.2899999999790452420711517333984375,"last":488694.2899999999790452420711517333984375,"buy":488694.2899999999790452420711517333984375,"sell":488694.2899999999790452420711517333984375,"symbol":"$"},"INR":{"15m":4705352.969999999739229679107666015625,"last":4705352.969999999739229679107666015625,"buy":4705352.969999999739229679107666015625,"sell":4705352.969999999739229679107666015625,"symbol":"\u20b9"},"ISK":{"15m":7981029.290000000037252902984619140625,"last":7981029.290000000037252902984619140625,"buy":7981029.290000000037252902984619140625,"sell":7981029.290000000037252902984619140625,"symbol":"kr"},"JPY":{"15m":6859993.0899999998509883880615234375,"last":6859993.0899999998509883880615234375,"buy":6859993.0899999998509883880615234375,"sell":6859993.0899999998509883880615234375,"symbol":"\u00a5"},"KRW":{"15m":70411750.35999999940395355224609375,"last":70411750.35999999940395355224609375,"buy":70411750.35999999940395355224609375,"sell":70411750.35999999940395355224609375,"symbol":"\u20a9"},"NZD":{"15m":87871.08999999999650754034519195556640625,"last":87871.08999999999650754034519195556640625,"buy":87871.08999999999650754034519195556640625,"sell":87871.08999999999650754034519195556640625,"symbol":"$"},"PLN":{"15m":239641.380000000004656612873077392578125,"last":239641.380000000004656612873077392578125,"buy":239641.380000000004656612873077392578125,"sell":239641.380000000004656612873077392578125,"symbol":"z\u0142"},"RUB":{"15m":4799532.83000000007450580596923828125,"last":4799532.83000000007450580596923828125,"buy":4799532.83000000007450580596923828125,"sell":4799532.83000000007450580596923828125,"symbol":"RUB"},"SEK":{"15m":532344.849999999976716935634613037109375,"last":532344.849999999976716935634613037109375,"buy":532344.849999999976716935634613037109375,"sell":532344.849999999976716935634613037109375,"symbol":"kr"},"SGD":{"15m":84037.360000000000582076609134674072265625,"last":84037.360000000000582076609134674072265625,"buy":84037.360000000000582076609134674072265625,"sell":84037.360000000000582076609134674072265625,"symbol":"$"},"THB":{"15m":1967701.82000000006519258022308349609375,"last":1967701.82000000006519258022308349609375,"buy":1967701.82000000006519258022308349609375,"sell":1967701.82000000006519258022308349609375,"symbol":"\u0e3f"},"TRY":{"15m":505408.96999999997206032276153564453125,"last":505408.96999999997206032276153564453125,"buy":505408.96999999997206032276153564453125,"sell":505408.96999999997206032276153564453125,"symbol":"\u20ba"},"TWD":{"15m":1784709.38999999989755451679229736328125,"last":1784709.38999999989755451679229736328125,"buy":1784709.38999999989755451679229736328125,"sell":1784709.38999999989755451679229736328125,"symbol":"NT$"}}' %} {% 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: 0.0079476