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":91625088.5900000035762786865234375,"last":91625088.5900000035762786865234375,"buy":91625088.5900000035762786865234375,"sell":91625088.5900000035762786865234375,"symbol":"ARS"},"AUD":{"15m":89661.60000000000582076609134674072265625,"last":89661.60000000000582076609134674072265625,"buy":89661.60000000000582076609134674072265625,"sell":89661.60000000000582076609134674072265625,"symbol":"AUD"},"BRL":{"15m":326861.0800000000162981450557708740234375,"last":326861.0800000000162981450557708740234375,"buy":326861.0800000000162981450557708740234375,"sell":326861.0800000000162981450557708740234375,"symbol":"BRL"},"CAD":{"15m":88149.360000000000582076609134674072265625,"last":88149.360000000000582076609134674072265625,"buy":88149.360000000000582076609134674072265625,"sell":88149.360000000000582076609134674072265625,"symbol":"CAD"},"CHF":{"15m":50388.41000000000349245965480804443359375,"last":50388.41000000000349245965480804443359375,"buy":50388.41000000000349245965480804443359375,"sell":50388.41000000000349245965480804443359375,"symbol":"CHF"},"CLP":{"15m":57846378.869999997317790985107421875,"last":57846378.869999997317790985107421875,"buy":57846378.869999997317790985107421875,"sell":57846378.869999997317790985107421875,"symbol":"CLP"},"CNY":{"15m":428383.0900000000256113708019256591796875,"last":428383.0900000000256113708019256591796875,"buy":428383.0900000000256113708019256591796875,"sell":428383.0900000000256113708019256591796875,"symbol":"CNY"},"CZK":{"15m":1326451.6499999999068677425384521484375,"last":1326451.6499999999068677425384521484375,"buy":1326451.6499999999068677425384521484375,"sell":1326451.6499999999068677425384521484375,"symbol":"CZK"},"DKK":{"15m":409731.6699999999837018549442291259765625,"last":409731.6699999999837018549442291259765625,"buy":409731.6699999999837018549442291259765625,"sell":409731.6699999999837018549442291259765625,"symbol":"DKK"},"EUR":{"15m":54821.3799999999973806552588939666748046875,"last":54821.3799999999973806552588939666748046875,"buy":54821.3799999999973806552588939666748046875,"sell":54821.3799999999973806552588939666748046875,"symbol":"EUR"},"GBP":{"15m":47383.449999999997089616954326629638671875,"last":47383.449999999997089616954326629638671875,"buy":47383.449999999997089616954326629638671875,"sell":47383.449999999997089616954326629638671875,"symbol":"GBP"},"GHS":{"15m":792221.7700000000186264514923095703125,"last":792221.7700000000186264514923095703125,"buy":792221.7700000000186264514923095703125,"sell":792221.7700000000186264514923095703125,"symbol":"GHS"},"HKD":{"15m":495119.0499999999883584678173065185546875,"last":495119.0499999999883584678173065185546875,"buy":495119.0499999999883584678173065185546875,"sell":495119.0499999999883584678173065185546875,"symbol":"HKD"},"HRK":{"15m":291495.2000000000116415321826934814453125,"last":291495.2000000000116415321826934814453125,"buy":291495.2000000000116415321826934814453125,"sell":291495.2000000000116415321826934814453125,"symbol":"HRK"},"HUF":{"15m":19507625.4699999988079071044921875,"last":19507625.4699999988079071044921875,"buy":19507625.4699999988079071044921875,"sell":19507625.4699999988079071044921875,"symbol":"HUF"},"INR":{"15m":6024716.879999999888241291046142578125,"last":6024716.879999999888241291046142578125,"buy":6024716.879999999888241291046142578125,"sell":6024716.879999999888241291046142578125,"symbol":"INR"},"ISK":{"15m":7871511.91999999992549419403076171875,"last":7871511.91999999992549419403076171875,"buy":7871511.91999999992549419403076171875,"sell":7871511.91999999992549419403076171875,"symbol":"ISK"},"JPY":{"15m":10135502.429999999701976776123046875,"last":10135502.429999999701976776123046875,"buy":10135502.429999999701976776123046875,"sell":10135502.429999999701976776123046875,"symbol":"JPY"},"KRW":{"15m":97895050.680000007152557373046875,"last":97895050.680000007152557373046875,"buy":97895050.680000007152557373046875,"sell":97895050.680000007152557373046875,"symbol":"KRW"},"NGN":{"15m":87492491.73999999463558197021484375,"last":87492491.73999999463558197021484375,"buy":87492491.73999999463558197021484375,"sell":87492491.73999999463558197021484375,"symbol":"NGN"},"NZD":{"15m":108931.949999999997089616954326629638671875,"last":108931.949999999997089616954326629638671875,"buy":108931.949999999997089616954326629638671875,"sell":108931.949999999997089616954326629638671875,"symbol":"NZD"},"PLN":{"15m":232718.16000000000349245965480804443359375,"last":232718.16000000000349245965480804443359375,"buy":232718.16000000000349245965480804443359375,"sell":232718.16000000000349245965480804443359375,"symbol":"PLN"},"RON":{"15m":287680.46999999997206032276153564453125,"last":287680.46999999997206032276153564453125,"buy":287680.46999999997206032276153564453125,"sell":287680.46999999997206032276153564453125,"symbol":"RON"},"RUB":{"15m":4654723.700000000186264514923095703125,"last":4654723.700000000186264514923095703125,"buy":4654723.700000000186264514923095703125,"sell":4654723.70000000018626451492309570312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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: 0.00791208