China: Brent futures fell 21 cents, or 0.3 per cent, to $75.69 a barrel and US West Texas Intermediate (WTI) crude futures were down 14 cents, or 0.2 per cent, at $71.06 at 0043 GMT.
"Within the decentralized finance ecosystem there are these very significant structural issues around the lack of transparency," Powell said during a panel discussion on digital finance organized by Banque de France.
Indian rupee again breached the psychologically crucial 80 mark to touch an all-time low of 80.11 in early trade on Monday tracking firmness in the US dollar.