This indicator shows Bitcoin price deviation from average of price across difference exchanges in percentage. As you can see, price at Bitfinex and Binance (both BTC/Tether pairs) are going up relative to BTC/USD pairs. This means Tether price is going down for some fishy reason(s). In the next update, I will add Tether price calculation.
Release Notes
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added an estimation for Tether price deviation from 1 USD in %