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":33674.66000000000349245965480804443359375,"last":33674.66000000000349245965480804443359375,"buy":33674.66000000000349245965480804443359375,"sell":33674.66000000000349245965480804443359375,"symbol":"$"},"AUD":{"15m":44443.2699999999967985786497592926025390625,"last":44443.2699999999967985786497592926025390625,"buy":44443.2699999999967985786497592926025390625,"sell":44443.2699999999967985786497592926025390625,"symbol":"$"},"BRL":{"15m":167245.1799999999930150806903839111328125,"last":167245.1799999999930150806903839111328125,"buy":167245.1799999999930150806903839111328125,"sell":167245.1799999999930150806903839111328125,"symbol":"R$"},"CAD":{"15m":41428.7900000000008731149137020111083984375,"last":41428.7900000000008731149137020111083984375,"buy":41428.7900000000008731149137020111083984375,"sell":41428.7900000000008731149137020111083984375,"symbol":"$"},"CHF":{"15m":30921.68999999999869032762944698333740234375,"last":30921.68999999999869032762944698333740234375,"buy":30921.68999999999869032762944698333740234375,"sell":30921.68999999999869032762944698333740234375,"symbol":"CHF"},"CLP":{"15m":24791240.9800000004470348358154296875,"last":24791240.9800000004470348358154296875,"buy":24791240.9800000004470348358154296875,"sell":24791240.9800000004470348358154296875,"symbol":"$"},"CNY":{"15m":218009.73000000001047737896442413330078125,"last":218009.73000000001047737896442413330078125,"buy":218009.73000000001047737896442413330078125,"sell":218009.73000000001047737896442413330078125,"symbol":"\u00a5"},"DKK":{"15m":209922.76000000000931322574615478515625,"last":209922.76000000000931322574615478515625,"buy":209922.76000000000931322574615478515625,"sell":209922.76000000000931322574615478515625,"symbol":"kr"},"EUR":{"15m":28225.7900000000008731149137020111083984375,"last":28225.7900000000008731149137020111083984375,"buy":28225.7900000000008731149137020111083984375,"sell":28225.7900000000008731149137020111083984375,"symbol":"\u20ac"},"GBP":{"15m":24114.59000000000014551915228366851806640625,"last":24114.59000000000014551915228366851806640625,"buy":24114.59000000000014551915228366851806640625,"sell":24114.59000000000014551915228366851806640625,"symbol":"\u00a3"},"HKD":{"15m":261483.04000000000814907252788543701171875,"last":261483.04000000000814907252788543701171875,"buy":261483.04000000000814907252788543701171875,"sell":261483.04000000000814907252788543701171875,"symbol":"$"},"INR":{"15m":2500246.8599999998696148395538330078125,"last":2500246.8599999998696148395538330078125,"buy":2500246.8599999998696148395538330078125,"sell":2500246.8599999998696148395538330078125,"symbol":"\u20b9"},"ISK":{"15m":4132890.6400000001303851604461669921875,"last":4132890.6400000001303851604461669921875,"buy":4132890.6400000001303851604461669921875,"sell":4132890.6400000001303851604461669921875,"symbol":"kr"},"JPY":{"15m":3742071.120000000111758708953857421875,"last":3742071.120000000111758708953857421875,"buy":3742071.120000000111758708953857421875,"sell":3742071.120000000111758708953857421875,"symbol":"\u00a5"},"KRW":{"15m":38253413.45000000298023223876953125,"last":38253413.45000000298023223876953125,"buy":38253413.45000000298023223876953125,"sell":38253413.45000000298023223876953125,"symbol":"\u20a9"},"NZD":{"15m":47783.08999999999650754034519195556640625,"last":47783.08999999999650754034519195556640625,"buy":47783.08999999999650754034519195556640625,"sell":47783.08999999999650754034519195556640625,"symbol":"$"},"PLN":{"15m":127867.66000000000349245965480804443359375,"last":127867.66000000000349245965480804443359375,"buy":127867.66000000000349245965480804443359375,"sell":127867.66000000000349245965480804443359375,"symbol":"z\u0142"},"RUB":{"15m":2446497.5,"last":2446497.5,"buy":2446497.5,"sell":2446497.5,"symbol":"RUB"},"SEK":{"15m":285631.9099999999743886291980743408203125,"last":285631.9099999999743886291980743408203125,"buy":285631.9099999999743886291980743408203125,"sell":285631.9099999999743886291980743408203125,"symbol":"kr"},"SGD":{"15m":45315.9899999999979627318680286407470703125,"last":45315.9899999999979627318680286407470703125,"buy":45315.9899999999979627318680286407470703125,"sell":45315.9899999999979627318680286407470703125,"symbol":"$"},"THB":{"15m":1071847.76000000000931322574615478515625,"last":1071847.76000000000931322574615478515625,"buy":1071847.76000000000931322574615478515625,"sell":1071847.76000000000931322574615478515625,"symbol":"\u0e3f"},"TRY":{"15m":290945.4299999999930150806903839111328125,"last":290945.4299999999930150806903839111328125,"buy":290945.4299999999930150806903839111328125,"sell":290945.4299999999930150806903839111328125,"symbol":"\u20ba"},"TWD":{"15m":945028.7299999999813735485076904296875,"last":945028.7299999999813735485076904296875,"buy":945028.7299999999813735485076904296875,"sell":945028.7299999999813735485076904296875,"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: 0.01484796