Exchange Rate Canister

Our Price Feed Data is given by Dfinity's (e)xchange rate canister (xrc). Calls to borrow, redeem (if in any markets) and liquidate call the xrc. The principal of the canister is listed below.
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Extracted from from the following repos:
The corresponding symbols to pass into the exchange rate canister below.
Token
Exchange Rate Canister Symbol
Asset Class
XTC
CXDR
FiatCurrency
ICP
ICP
Cryptocurrency
CKBTC
BTC
Cryptocurrency
The candid notation of the two parameters
type symbol = text;
type AssetClass = variant { Cryptocurrency; FiatCurrency; };