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 = 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EK":{"15m":600352.069999999948777258396148681640625,"last":600352.069999999948777258396148681640625,"buy":600352.069999999948777258396148681640625,"sell":600352.069999999948777258396148681640625,"symbol":"SEK"},"SGD":{"15m":80942.58999999999650754034519195556640625,"last":80942.58999999999650754034519195556640625,"buy":80942.58999999999650754034519195556640625,"sell":80942.58999999999650754034519195556640625,"symbol":"SGD"},"THB":{"15m":2114431.8999999999068677425384521484375,"last":2114431.8999999999068677425384521484375,"buy":2114431.8999999999068677425384521484375,"sell":2114431.8999999999068677425384521484375,"symbol":"THB"},"TRY":{"15m":2995399.4399999999441206455230712890625,"last":2995399.4399999999441206455230712890625,"buy":2995399.4399999999441206455230712890625,"sell":2995399.4399999999441206455230712890625,"symbol":"TRY"},"TWD":{"15m":2036904.98999999999068677425384521484375,"last":2036904.98999999999068677425384521484375,"buy":2036904.98999999999068677425384521484375,"sell":2036904.98999999999068677425384521484375,"symbol":"TWD"},"USD":{"15m":63044.3099999999976716935634613037109375,"last":63044.3099999999976716935634613037109375,"buy":63044.3099999999976716935634613037109375,"sell":63044.3099999999976716935634613037109375,"symbol":"USD"}}' %} {% 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: 0.00793093