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 = '{"AUD":{"15m":51457.7699999999967985786497592926025390625,"last":51457.7699999999967985786497592926025390625,"buy":51457.7699999999967985786497592926025390625,"sell":51457.7699999999967985786497592926025390625,"symbol":"AUD"},"BRL":{"15m":198196.97000000000116415321826934814453125,"last":198196.97000000000116415321826934814453125,"buy":198196.97000000000116415321826934814453125,"sell":198196.97000000000116415321826934814453125,"symbol":"BRL"},"CAD":{"15m":46128.610000000000582076609134674072265625,"last":46128.610000000000582076609134674072265625,"buy":46128.610000000000582076609134674072265625,"sell":46128.610000000000582076609134674072265625,"symbol":"CAD"},"CHF":{"15m":33799.8199999999997089616954326629638671875,"last":33799.8199999999997089616954326629638671875,"buy":33799.8199999999997089616954326629638671875,"sell":33799.8199999999997089616954326629638671875,"symbol":"CHF"},"CLP":{"15m":29471980.14000000059604644775390625,"last":29471980.14000000059604644775390625,"buy":29471980.14000000059604644775390625,"sell":29471980.14000000059604644775390625,"symbol":"CLP"},"CNY":{"15m":244077.89999999999417923390865325927734375,"last":244077.89999999999417923390865325927734375,"buy":244077.89999999999417923390865325927734375,"sell":244077.89999999999417923390865325927734375,"symbol":"CNY"},"CZK":{"15m":808600.23999999999068677425384521484375,"last":808600.23999999999068677425384521484375,"buy":808600.23999999999068677425384521484375,"sell":808600.23999999999068677425384521484375,"symbol":"CZK"},"DKK":{"15m":242052.54000000000814907252788543701171875,"last":242052.54000000000814907252788543701171875,"buy":242052.54000000000814907252788543701171875,"sell":242052.54000000000814907252788543701171875,"symbol":"DKK"},"EUR":{"15m":32551.99000000000160071067512035369873046875,"last":32551.99000000000160071067512035369873046875,"buy":32551.99000000000160071067512035369873046875,"sell":32551.99000000000160071067512035369873046875,"symbol":"EUR"},"GBP":{"15m":27145.22000000000116415321826934814453125,"last":27145.22000000000116415321826934814453125,"buy":27145.22000000000116415321826934814453125,"sell":27145.22000000000116415321826934814453125,"symbol":"GBP"},"HKD":{"15m":282733.9099999999743886291980743408203125,"last":282733.9099999999743886291980743408203125,"buy":282733.9099999999743886291980743408203125,"sell":282733.9099999999743886291980743408203125,"symbol":"HKD"},"HRK":{"15m":272600.650000000023283064365386962890625,"last":272600.650000000023283064365386962890625,"buy":272600.650000000023283064365386962890625,"sell":272600.650000000023283064365386962890625,"symbol":"HRK"},"HUF":{"15m":12592388.49000000022351741790771484375,"last":12592388.49000000022351741790771484375,"buy":12592388.49000000022351741790771484375,"sell":12592388.49000000022351741790771484375,"symbol":"HUF"},"INR":{"15m":3244795.7299999999813735485076904296875,"last":3244795.7299999999813735485076904296875,"buy":3244795.7299999999813735485076904296875,"sell":3244795.7299999999813735485076904296875,"symbol":"INR"},"ISK":{"15m":5809495.379999999888241291046142578125,"last":5809495.379999999888241291046142578125,"buy":5809495.379999999888241291046142578125,"sell":5809495.379999999888241291046142578125,"symbol":"ISK"},"JPY":{"15m":4185272.8399999998509883880615234375,"last":4185272.8399999998509883880615234375,"buy":4185272.8399999998509883880615234375,"sell":4185272.8399999998509883880615234375,"symbol":"JPY"},"KRW":{"15m":44466398.320000000298023223876953125,"last":44466398.320000000298023223876953125,"buy":44466398.320000000298023223876953125,"sell":44466398.320000000298023223876953125,"symbol":"KRW"},"NZD":{"15m":55093.9899999999979627318680286407470703125,"last":55093.9899999999979627318680286407470703125,"buy":55093.9899999999979627318680286407470703125,"sell":55093.9899999999979627318680286407470703125,"symbol":"NZD"},"PLN":{"15m":149563.119999999995343387126922607421875,"last":149563.119999999995343387126922607421875,"buy":149563.119999999995343387126922607421875,"sell":149563.119999999995343387126922607421875,"symbol":"PLN"},"RON":{"15m":142050.23999999999068677425384521484375,"last":142050.23999999999068677425384521484375,"buy":142050.23999999999068677425384521484375,"sell":142050.23999999999068677425384521484375,"symbol":"RON"},"RUB":{"15m":2824152.5600000000558793544769287109375,"last":2824152.5600000000558793544769287109375,"buy":2824152.5600000000558793544769287109375,"sell":2824152.5600000000558793544769287109375,"symbol":"RUB"},"SEK":{"15m":338823.1799999999930150806903839111328125,"last":338823.1799999999930150806903839111328125,"buy":338823.1799999999930150806903839111328125,"sell":338823.1799999999930150806903839111328125,"symbol":"SEK"},"SGD":{"15m":50181,"last":50181,"buy":50181,"sell":50181,"symbol":"SGD"},"THB":{"15m":1224168.41999999992549419403076171875,"last":1224168.41999999992549419403076171875,"buy":1224168.41999999992549419403076171875,"sell":1224168.41999999992549419403076171875,"symbol":"THB"},"TRY":{"15m":501208.590000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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: 0.01379751