diff --git a/server/src/index.ts b/server/src/index.ts
index 131ba97..75a30ad 100644
--- a/server/src/index.ts
+++ b/server/src/index.ts
@@ -46,7 +46,7 @@ const appRouter = router({
     }),
   getExpirationsForUnderlying: publicProcedure
     .input(RpcType(ObjectT({
-      underlying:StringT(),
+      underlying:StringT({maxLength:5}),
       asOfDate:StringT()
     })))
     .query(async (opts)=>{
@@ -62,7 +62,7 @@ const appRouter = router({
     }),
   getStrikesForUnderlying: publicProcedure
     .input(RpcType(ObjectT({
-      underlying:StringT(),
+      underlying:StringT({maxLength:5}),
       asOfDate:StringT(),
       expirationDate:StringT(),
     })))
@@ -80,7 +80,7 @@ const appRouter = router({
     }),
   getOpensForUnderlying: publicProcedure
     .input(RpcType(ObjectT({
-      underlying:StringT()
+      underlying:StringT({maxLength:5})
     })))
     .query(async (opts)=>{
       const {underlying} = opts.input;
@@ -96,7 +96,7 @@ const appRouter = router({
     }),
   getOpensForOptionContract: publicProcedure
     .input(RpcType(ObjectT({
-      underlying:StringT(),
+      underlying:StringT({maxLength:5}),
       expirationDate:StringT(),
       strike:NumberT()
     })))
@@ -117,7 +117,7 @@ const appRouter = router({
     }),
   getHistoricalCalendarPrices: publicProcedure
     .input(RpcType(ObjectT({
-      underlying:StringT(),
+      underlying:StringT({maxLength:5}),
       daysToFrontExpiration:NumberT(),
       daysBetweenFrontAndBackExpiration:NumberT(),
       strikePercentageFromUnderlyingPriceRangeMin:NumberT(),
@@ -140,7 +140,7 @@ const appRouter = router({
     }),
   getHistoricalStockQuoteChartData: publicProcedure
     .input(RpcType(ObjectT({
-      underlying:StringT(),
+      underlying:StringT({maxLength:5}),
       lookbackPeriodStart:StringT(),
       lookbackPeriodEnd:StringT(),
     })))
@@ -159,7 +159,7 @@ const appRouter = router({
     }),
   getHistoricalCalendarQuoteChartData: publicProcedure
     .input(RpcType(ObjectT({
-      underlying:StringT(),
+      underlying:StringT({maxLength:5}),
       daysToFrontExpiration:NumberT(),
       daysBetweenFrontAndBackExpiration:NumberT(),
       strikePercentageFromUnderlyingPriceRangeMin:NumberT(),
@@ -185,11 +185,11 @@ const appRouter = router({
     }),
   getHistoricalCalendarExitQuoteChartData: publicProcedure
     .input(RpcType(ObjectT({
-      underlying:StringT(),
+      underlying:StringT({maxLength:5}),
       daysToFrontExpiration:NumberT(),
       daysBetweenFrontAndBackExpiration:NumberT(),
-      lookbackPeriodStart:StringT(),
-      lookbackPeriodEnd:StringT(),
+      lookbackPeriodStart:StringT({pattern:'[0-9]{4}\-[0-9]{2}\-[0-9]{2}'}),
+      lookbackPeriodEnd:StringT({pattern:'[0-9]{4}\-[0-9]{2}\-[0-9]{2}'}),
     })))
     .query(async (opts)=>{
       const {underlying, daysToFrontExpiration, daysBetweenFrontAndBackExpiration, lookbackPeriodStart, lookbackPeriodEnd, } = opts.input;