update our alpaca calls to be separate bid and ask

src/alpaca.ts

@@ -32,8 +32,8 @@ export interface AlpacaClock {
 }
 
 export interface AlpacaQuote {
-    ap: number; // ask price
-    bp: number; // bid price
+    AskPrice: number;
+    BidPrice: number;
 }
 
 export interface AlpacaTrade {
@@ -83,8 +83,17 @@ export class Alpaca {
         return this.alpaca.getClock();
     }
 
-    public async getLatestQuote(symbol: string) {
-        return this.alpaca.getLatestQuote(symbol);
+    public async getLatestAsk(symbol: string): Promise<number> {
+        const quote = await this.alpaca.getLatestQuote(symbol);
+        return quote.AskPrice;
+    }
+    public async getLatestBid(symbol: string): Promise<number> {
+        const quote = await this.alpaca.getLatestQuote(symbol);
+        return quote.BidPrice;
+    }
+    public async getLatestSpread(symbol: string): Promise<number> {
+        const quote = await this.alpaca.getLatestQuote(symbol);
+        return quote.AskPrice - quote.BidPrice;
     }
     public async getLatestTrades(symbols: string[]) {
         return this.alpaca.getLatestTrades(symbols);