diff --git a/ui/src/components/AmountSelectorDialog.tsx b/ui/src/components/AmountSelectorDialog.tsx
index fa349055..2eabac39 100644
--- a/ui/src/components/AmountSelectorDialog.tsx
+++ b/ui/src/components/AmountSelectorDialog.tsx
@@ -70,7 +70,7 @@ const AmountSelectorDialog = ({
       <div className="px-2">
         <p className="font-medium italic">Select {selectedBrand} Amount</p>
         {purse && (
-          <PurseAmountInput purse={purse} onChange={setSelectedAmount} />
+          <PurseAmountInput purse={purse} onChange={setSelectedAmount} onChangeInput={()=>{}} />
         )}
       </div>
     );
diff --git a/ui/src/components/DisplayAmount.tsx b/ui/src/components/DisplayAmount.tsx
index fa289e2c..4592df15 100644
--- a/ui/src/components/DisplayAmount.tsx
+++ b/ui/src/components/DisplayAmount.tsx
@@ -33,7 +33,7 @@ export const AmountValue = ({
   displayInfo,
   allowPopup,
 }: {
-  amount: Amount;
+  amount: Amount<'set'> | Amount<'nat'> | Amount<'copyBag'> | Amount<'copySet'>;
   displayInfo: DisplayInfoForBrand;
   allowPopup?: boolean;
 }) => {
@@ -65,7 +65,7 @@ export const NonNatValue = ({
   petname,
   allowPopup = true,
 }: {
-  value: Amount<'set'>['value'] | Amount<'copyBag'>['value'];
+  value: Amount<'set'>['value'] | Amount<'copyBag'>['value'] | Amount<'nat'>['value'] | Amount<'copySet'>['value'];
   petname: string;
   allowPopup?: boolean;
 }) => {
@@ -86,24 +86,23 @@ export const NonNatValue = ({
 
   const count = isCopyBag
     ? String(
-        value.payload.reduce(
-          // @ts-expect-error cast
+        (value as Amount<'copyBag'>['value']).payload.reduce(
           // eslint-disable-next-line @typescript-eslint/no-unused-vars
           (total, [_, count]) => total + count,
           0n,
         ),
       )
-    : value.length;
+    : (value as Amount<'set'>['value']).length;
 
   const items = isCopyBag
-    ? value.payload.map((entry: [unknown, bigint]) => (
+    ? (value as Amount<'copyBag'>['value']).payload.map((entry: [unknown, bigint]) => (
         <CopyBagEntry
           key={stringifyData(entry[0])}
           className="mb-4"
           entry={entry}
         />
       ))
-    : value.map((entry: unknown) => (
+    : (value as Amount<'set'>['value']).map((entry: unknown) => (
         <SetEntry className="mb-4" key={stringifyData(entry)} entry={entry} />
       ));
 
diff --git a/ui/src/components/PurseAmountInput.tsx b/ui/src/components/PurseAmountInput.tsx
index dbb1ecc0..ca0b91f8 100644
--- a/ui/src/components/PurseAmountInput.tsx
+++ b/ui/src/components/PurseAmountInput.tsx
@@ -1,12 +1,13 @@
 import { AmountInput, type PurseJSONState } from '@agoric/react-components';
-import type { Amount, AssetKind } from '@agoric/web-components';
+import type { AssetKind } from '@agoric/web-components';
 import { useState } from 'react';
 import { CopyBagEntry, PurseValue, SetEntry } from './DisplayAmount';
 import { stringifyData } from '../utils/stringify';
-import { makeCopyBag } from '@endo/patterns';
+import { makeCopyBag, Key } from '@endo/patterns';
 
 type Props = {
   purse: PurseJSONState<AssetKind>;
+  onChangeInput: (amount: {brand: globalThis.Brand, value: unknown} | null) => void;
   onChange: (amount: Amount | null) => void;
 };
 
@@ -35,7 +36,7 @@ const PurseAmountInput = (props: Props) => {
   return <></>;
 };
 
-const SetInput = ({ purse, onChange }: Props) => {
+const SetInput = ({ purse, onChangeInput }: Props) => {
   const entries = purse.currentAmount.value;
   const [checkedEntries, setCheckedEntries] = useState(new Set<unknown>());
 
@@ -48,13 +49,13 @@ const SetInput = ({ purse, onChange }: Props) => {
       updated.add(entry);
     }
     if (!updated.size) {
-      onChange(null);
+      onChangeInput(null);
     } else {
       const newAmount = {
         brand: purse.brand,
         value: [...updated],
       };
-      onChange(newAmount);
+      onChangeInput(newAmount);
     }
     setCheckedEntries(updated);
   };
@@ -85,13 +86,13 @@ const SetInput = ({ purse, onChange }: Props) => {
   });
 };
 
-const CopyBagInput = ({ purse, onChange }: Props) => {
+const CopyBagInput = ({ purse, onChangeInput }: Props) => {
   const entries = purse.currentAmount.value.payload;
   const [entriesMap, setEntriesMap] = useState(
-    new Map<string, [unknown, bigint]>(),
+    new Map<string, [Key, bigint]>(),
   );
 
-  const updateCount = (entry: [unknown, bigint], count: bigint) => {
+  const updateCount = (entry: [Key, bigint], count: bigint) => {
     const updated = new Map(entriesMap);
     if (count === 0n) {
       updated.delete(stringifyData(entry[0]));
@@ -99,18 +100,18 @@ const CopyBagInput = ({ purse, onChange }: Props) => {
       updated.set(stringifyData(entry[0]), [entry[0], count]);
     }
     if (count > entry[1]) {
-      onChange(null);
+      onChangeInput(null);
     } else {
       const newAmount = {
         brand: purse.brand,
         value: makeCopyBag(updated.values()),
       };
-      onChange(newAmount);
+      onChangeInput(newAmount);
     }
     setEntriesMap(updated);
   };
 
-  return entries.map((entry: [unknown, bigint]) => {
+  return entries.map((entry: [Key, bigint]) => {
     const selectedAmount = entriesMap.get(stringifyData(entry[0]))?.[1] ?? null;
 
     const onInput = (count: bigint) => {
@@ -143,16 +144,16 @@ const CopyBagInput = ({ purse, onChange }: Props) => {
   });
 };
 
-const NatAmountInput = ({ purse, onChange }: Props) => {
+const NatAmountInput = ({ purse, onChangeInput }: Props) => {
   const [amount, setAmount] = useState({ brand: purse?.brand, value: 0n });
   const hasError = amount.value > purse.currentAmount.value;
 
   const onInputChange = (value: bigint) => {
     const newAmount = { brand: purse?.brand, value };
     if (value > purse.currentAmount.value || value === 0n) {
-      onChange(null);
+      onChangeInput(null);
     } else {
-      onChange(newAmount);
+      onChangeInput(newAmount);
     }
     setAmount(newAmount);
   };
diff --git a/ui/src/components/mint/MintTickets.tsx b/ui/src/components/mint/MintTickets.tsx
index 023a750f..1b358bcc 100644
--- a/ui/src/components/mint/MintTickets.tsx
+++ b/ui/src/components/mint/MintTickets.tsx
@@ -26,7 +26,7 @@ const makeOffer = (
     [ticketKind.toLowerCase() + 'Row', ticketValue],
   ];
   const choiceBag = makeCopyBag(choices);
-  const ticketAmount = AmountMath.make(brands.Ticket, choiceBag);
+  const ticketAmount = AmountMath.make((brands.Ticket as Brand), choiceBag);
   const want = { Tickets: ticketAmount };
   const give = { Price: { brand: brands.IST, value: giveValue * IST_UNIT } };
 
diff --git a/ui/src/components/swap/IncomingOffers.tsx b/ui/src/components/swap/IncomingOffers.tsx
index bf30eed0..554de632 100644
--- a/ui/src/components/swap/IncomingOffers.tsx
+++ b/ui/src/components/swap/IncomingOffers.tsx
@@ -7,10 +7,12 @@ const IncomingOffers = () => {
   const { instances } = useContractStore();
   const swaparooInstance = instances?.['swaparoo'];
   const invitationPurse = usePurse('Invitation');
-  const swaparooInvitations = invitationPurse?.currentAmount.value.filter(
+  const swaparooInvitations = Array.isArray(invitationPurse?.currentAmount.value) ?
+  invitationPurse?.currentAmount.value.filter(
+    // @ts-expect-error cast
     ({ instance, description }: { instance: unknown; description: string }) =>
       instance === swaparooInstance && description.startsWith('matchOffer'),
-  ) as Array<unknown>[] | undefined;
+  ): []
 
   return (
     <div className="w-80">