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":82716.27999999999883584678173065185546875,"last":82716.27999999999883584678173065185546875,"buy":82716.27999999999883584678173065185546875,"sell":82716.27999999999883584678173065185546875,"symbol":"AUD"},"BRL":{"15m":337609.28000000002793967723846435546875,"last":337609.28000000002793967723846435546875,"buy":337609.28000000002793967723846435546875,"sell":337609.28000000002793967723846435546875,"symbol":"BRL"},"CAD":{"15m":76582.47000000000116415321826934814453125,"last":76582.47000000000116415321826934814453125,"buy":76582.47000000000116415321826934814453125,"sell":76582.47000000000116415321826934814453125,"symbol":"CAD"},"CHF":{"15m":56842.5699999999997089616954326629638671875,"last":56842.5699999999997089616954326629638671875,"buy":56842.5699999999997089616954326629638671875,"sell":56842.5699999999997089616954326629638671875,"symbol":"CHF"},"CLP":{"15m":50597688.490000002086162567138671875,"last":50597688.490000002086162567138671875,"buy":50597688.490000002086162567138671875,"sell":50597688.490000002086162567138671875,"symbol":"CLP"},"CNY":{"15m":387445.25,"last":387445.25,"buy":387445.25,"sell":387445.25,"symbol":"CNY"},"CZK":{"15m":1347436.1499999999068677425384521484375,"last":1347436.1499999999068677425384521484375,"buy":1347436.1499999999068677425384521484375,"sell":1347436.1499999999068677425384521484375,"symbol":"CZK"},"DKK":{"15m":313097.609999999986030161380767822265625,"last":313097.609999999986030161380767822265625,"buy":313097.609999999986030161380767822265625,"sell":313097.609999999986030161380767822265625,"symbol":"DKK"},"EUR":{"15m":52864.2099999999991268850862979888916015625,"last":52864.2099999999991268850862979888916015625,"buy":52864.2099999999991268850862979888916015625,"sell":52864.2099999999991268850862979888916015625,"symbol":"EUR"},"GBP":{"15m":44589.5,"last":44589.5,"buy":44589.5,"sell":44589.5,"symbol":"GBP"},"HKD":{"15m":474862.1599999999743886291980743408203125,"last":474862.1599999999743886291980743408203125,"buy":474862.1599999999743886291980743408203125,"sell":474862.1599999999743886291980743408203125,"symbol":"HKD"},"HRK":{"15m":461171.619999999995343387126922607421875,"last":461171.619999999995343387126922607421875,"buy":461171.619999999995343387126922607421875,"sell":461171.619999999995343387126922607421875,"symbol":"HRK"},"HUF":{"15m":18605084.85999999940395355224609375,"last":18605084.85999999940395355224609375,"buy":18605084.85999999940395355224609375,"sell":18605084.85999999940395355224609375,"symbol":"HUF"},"INR":{"15m":4664990.9800000004470348358154296875,"last":4664990.9800000004470348358154296875,"buy":4664990.9800000004470348358154296875,"sell":4664990.9800000004470348358154296875,"symbol":"INR"},"ISK":{"15m":6816163.5,"last":6816163.5,"buy":6816163.5,"sell":6816163.5,"symbol":"ISK"},"JPY":{"15m":7007332.719999999739229679107666015625,"last":7007332.719999999739229679107666015625,"buy":7007332.719999999739229679107666015625,"sell":7007332.719999999739229679107666015625,"symbol":"JPY"},"KRW":{"15m":75536872.5,"last":75536872.5,"buy":75536872.5,"sell":75536872.5,"symbol":"KRW"},"NZD":{"15m":86847.889999999999417923390865325927734375,"last":86847.889999999999417923390865325927734375,"buy":86847.889999999999417923390865325927734375,"sell":86847.889999999999417923390865325927734375,"symbol":"NZD"},"PLN":{"15m":238784,"last":238784,"buy":238784,"sell":238784,"symbol":"PLN"},"RON":{"15m":234665.380000000004656612873077392578125,"last":234665.380000000004656612873077392578125,"buy":234665.380000000004656612873077392578125,"sell":234665.380000000004656612873077392578125,"symbol":"RON"},"RUB":{"15m":4364649.33000000007450580596923828125,"last":4364649.33000000007450580596923828125,"buy":4364649.33000000007450580596923828125,"sell":4364649.33000000007450580596923828125,"symbol":"RUB"},"SEK":{"15m":562935.69999999995343387126922607421875,"last":562935.69999999995343387126922607421875,"buy":562935.69999999995343387126922607421875,"sell":562935.69999999995343387126922607421875,"symbol":"SEK"},"SGD":{"15m":82569.979999999995925463736057281494140625,"last":82569.979999999995925463736057281494140625,"buy":82569.979999999995925463736057281494140625,"sell":82569.979999999995925463736057281494140625,"symbol":"SGD"},"THB":{"15m":2047950.59000000008381903171539306640625,"last":2047950.59000000008381903171539306640625,"buy":2047950.59000000008381903171539306640625,"sell":2047950.59000000008381903171539306640625,"symbol":"THB"},"TRY":{"15m":569217.829999999958090484142303466796875,"last":569217.829999999958090484142303466796875,"buy":569217.829999999958090484142303466796875,"sell":569217.829999999958090484142303466796875,"symbol":"TRY"},"TWD":{"15m":1913572.6499999999068677425384521484375,"last":1913572.6499999999068677425384521484375,"buy":1913572.6499999999068677425384521484375,"sell":1913572.6499999999068677425384521484375,"symbol":"TWD"},"USD":{"15m":61265.9800000000032014213502407073974609375,"last":61265.9800000000032014213502407073974609375,"buy":61265.980000000003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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: 0.00816114