diff --git a/src/components/common/CreatorCard.tsx b/src/components/common/CreatorCard.tsx
index 9005bc2c..1a6a4802 100644
--- a/src/components/common/CreatorCard.tsx
+++ b/src/components/common/CreatorCard.tsx
@@ -22,6 +22,7 @@ import CreatorListRowDivider from '@/components/common/CreatorListRowDivider';
 import BuyActionHelperText from '@/components/common/BuyActionHelperText';
 import CreatorLabeledStatRow from '@/components/common/CreatorLabeledStatRow';
 import { useTransactionTelemetry } from '@/hooks/useTransactionTelemetry';
+import { formatCompactNumber, formatNumber } from '@/utils/numberFormat.utils';
 
 interface CreatorCardProps {
 	creator: Course;
@@ -116,7 +117,7 @@ const CreatorCard: React.FC<CreatorCardProps> = ({ creator, className }) => {
 						<TrendingUp className="size-3 text-emerald-400" />
 						<span className="text-xs font-bold text-white/90">
 							{creator.volume24h > 0
-								? `${creator.volume24h} ETH`
+								? `${formatCompactNumber(creator.volume24h)} ETH`
 								: 'New'}
 						</span>
 					</div>
@@ -157,7 +158,7 @@ const CreatorCard: React.FC<CreatorCardProps> = ({ creator, className }) => {
 				</div>
 
 				<div className="mt-3 flex flex-wrap gap-2">
-					<MiniStatChip label="Price" value={`${creator.price} ETH`} />
+					<MiniStatChip label="Price" value={`${formatNumber(creator.price)} ETH`} />
 					<MiniStatChip
 						label="Category"
 						value={creator.category || 'General'}
@@ -170,7 +171,7 @@ const CreatorCard: React.FC<CreatorCardProps> = ({ creator, className }) => {
 						label="Creator Share Supply"
 						value={
 							creator.creatorShareSupply
-								? `${creator.creatorShareSupply} shares`
+								? `${formatCompactNumber(creator.creatorShareSupply)} shares`
 								: 'Supply pending'
 						}
 						className="px-3 py-3"
@@ -202,7 +203,7 @@ const CreatorCard: React.FC<CreatorCardProps> = ({ creator, className }) => {
 					/>
 					<CardMetaRow
 						label="Key Price"
-						value={`${creator.price} ETH`}
+						value={`${formatNumber(creator.price)} ETH`}
 						truncateValue={false}
 						valueClassName="font-grotesque text-base font-black text-amber-400"
 					/>
diff --git a/src/components/common/KeySupplyBadge.tsx b/src/components/common/KeySupplyBadge.tsx
index 984f7ecd..cffdc04a 100644
--- a/src/components/common/KeySupplyBadge.tsx
+++ b/src/components/common/KeySupplyBadge.tsx
@@ -3,6 +3,7 @@ import { Key } from 'lucide-react';
 import { cn } from '@/lib/utils';
 import { Tooltip } from '@/components/ui/tooltip';
 import { formatRelativeTime, type TooltipContent } from '@/utils/keyPrice.utils';
+import { formatCompactNumber, formatNumber } from '@/utils/numberFormat.utils';
 
 interface KeySupplyBadgeProps {
 	/** Total key supply. Undefined or null renders a graceful placeholder. */
@@ -11,16 +12,6 @@ interface KeySupplyBadgeProps {
 	tooltipContent?: TooltipContent;
 }
 
-function formatSupply(supply: number): string {
-	if (supply >= 1_000_000) {
-		return `${(supply / 1_000_000).toFixed(1).replace(/\.0$/, '')}M`;
-	}
-	if (supply >= 1_000) {
-		return `${(supply / 1_000).toFixed(1).replace(/\.0$/, '')}K`;
-	}
-	return supply.toString();
-}
-
 function KeyPriceTooltipContent({ lastUpdated, quoteSource }: TooltipContent) {
 	const timeLabel = formatRelativeTime(lastUpdated);
 	const sourceLabel = quoteSource?.trim() ? `Source: ${quoteSource}` : 'Source: N/A';
@@ -45,10 +36,10 @@ const KeySupplyBadge: React.FC<KeySupplyBadgeProps> = ({ supply, className, tool
 					: 'border-white/10 bg-white/[0.06] text-white/40',
 				className
 			)}
-			title={hasData ? `${supply} keys available` : 'Supply not available'}
+			title={hasData ? `${formatNumber(supply)} keys available` : 'Supply not available'}
 		>
 			<Key className="size-3" aria-hidden="true" />
-			<span>{hasData ? formatSupply(supply!) : '—'}</span>
+			<span>{hasData ? formatCompactNumber(supply!) : '—'}</span>
 		</span>
 	);
 
diff --git a/src/components/common/TradeDialog.tsx b/src/components/common/TradeDialog.tsx
new file mode 100644
index 00000000..70b24e99
--- /dev/null
+++ b/src/components/common/TradeDialog.tsx
@@ -0,0 +1,129 @@
+import { useEffect, useMemo, useRef, useState } from 'react';
+import { Button } from '@/components/ui/button';
+import {
+	Dialog,
+	DialogContent,
+	DialogDescription,
+	DialogFooter,
+	DialogHeader,
+	DialogTitle,
+} from '@/components/ui/dialog';
+import { cn } from '@/lib/utils';
+import { formatNumber } from '@/utils/numberFormat.utils';
+
+export type TradeSide = 'buy' | 'sell';
+
+export interface TradeDialogProps {
+	open: boolean;
+	side: TradeSide;
+	creatorName: string;
+	availableHoldings: number;
+	onOpenChange: (open: boolean) => void;
+	onConfirm: (amount: number) => Promise<void> | void;
+	isSubmitting?: boolean;
+}
+
+const TradeDialog: React.FC<TradeDialogProps> = ({
+	open,
+	side,
+	creatorName,
+	availableHoldings,
+	onOpenChange,
+	onConfirm,
+	isSubmitting = false,
+}) => {
+	const [amountText, setAmountText] = useState('1');
+	const amountInputRef = useRef<HTMLInputElement | null>(null);
+
+	useEffect(() => {
+		if (open) setAmountText('1');
+	}, [open]);
+
+	const parsedAmount = useMemo(() => {
+		const normalized = amountText.trim();
+		if (!normalized) return NaN;
+		return Number(normalized);
+	}, [amountText]);
+
+	const amountValid =
+		Number.isFinite(parsedAmount) &&
+		parsedAmount > 0 &&
+		(side !== 'sell' || parsedAmount <= availableHoldings);
+
+	const title = side === 'buy' ? 'Buy keys' : 'Sell keys';
+	const confirmLabel = side === 'buy' ? 'Confirm buy' : 'Confirm sell';
+
+	return (
+		<Dialog open={open} onOpenChange={next => !isSubmitting && onOpenChange(next)}>
+			<DialogContent
+				className="max-w-md"
+				showCloseButton={!isSubmitting}
+				onOpenAutoFocus={event => {
+					event.preventDefault();
+					amountInputRef.current?.focus();
+				}}
+				onEscapeKeyDown={event => {
+					if (isSubmitting) event.preventDefault();
+				}}
+				onInteractOutside={event => {
+					if (isSubmitting) event.preventDefault();
+				}}
+			>
+				<DialogHeader>
+					<DialogTitle>{title}</DialogTitle>
+					<DialogDescription>
+						{side === 'buy'
+							? `Purchase creator keys for ${creatorName}.`
+							: `Sell creator keys for ${creatorName}.`}
+					</DialogDescription>
+				</DialogHeader>
+
+				<div className="space-y-2">
+					<div className="text-sm text-white/70">Amount</div>
+					<input
+						ref={amountInputRef}
+						inputMode="decimal"
+						value={amountText}
+						onChange={event => setAmountText(event.target.value)}
+						disabled={isSubmitting}
+						className={cn(
+							'w-full rounded-xl border bg-white/[0.04] px-3 py-2 text-white outline-none transition-colors',
+							'border-white/10 focus:border-amber-500/50 focus:ring-2 focus:ring-amber-500/15',
+							!amountValid && amountText.trim() ? 'border-red-500/40' : ''
+						)}
+						aria-label="Trade amount"
+					/>
+					<div className="text-xs text-white/45">
+						Holdings: {formatNumber(availableHoldings)} keys
+					</div>
+					{side === 'sell' && parsedAmount > availableHoldings && (
+						<div className="text-xs text-red-300">
+							You can’t sell more than your current holdings.
+						</div>
+					)}
+				</div>
+
+				<DialogFooter className="sm:justify-between">
+					<Button
+						type="button"
+						variant="ghost"
+						onClick={() => onOpenChange(false)}
+						disabled={isSubmitting}
+					>
+						Cancel
+					</Button>
+					<Button
+						type="button"
+						onClick={() => onConfirm(parsedAmount)}
+						disabled={!amountValid || isSubmitting}
+					>
+						{isSubmitting ? 'Submitting…' : confirmLabel}
+					</Button>
+				</DialogFooter>
+			</DialogContent>
+		</Dialog>
+	);
+};
+
+export default TradeDialog;
+
diff --git a/src/pages/LandingPage.tsx b/src/pages/LandingPage.tsx
index 198b51ad..4f76e285 100644
--- a/src/pages/LandingPage.tsx
+++ b/src/pages/LandingPage.tsx
@@ -19,6 +19,10 @@ import CreatorBreadcrumb from '@/components/common/CreatorBreadcrumb';
 import CreatorProfileHeader from '@/components/common/CreatorProfileHeader';
 import TransactionRetryNotice from '@/components/common/TransactionRetryNotice';
 import EmptyTransactionTimelineState from '@/components/common/EmptyTransactionTimelineState';
+import TradeDialog, { type TradeSide } from '@/components/common/TradeDialog';
+import PendingTxModal from '@/components/common/PendingTxModal';
+import showToast from '@/utils/toast.util';
+import { formatCompactNumber, formatNumber } from '@/utils/numberFormat.utils';
 
 const FEATURED_CREATOR_FACTS = [
 	{ label: 'Membership', value: 'Collectors Circle' },
@@ -120,6 +124,11 @@ function LandingPage() {
 	const [isLoading, setIsLoading] = useState(true);
 	const [searchQuery, setSearchQuery] = useState('');
 	const [activeProfileTab, setActiveProfileTab] = useState('overview');
+	const [featuredHoldings, setFeaturedHoldings] = useState(3);
+	const [tradeSide, setTradeSide] = useState<TradeSide>('buy');
+	const [tradeDialogOpen, setTradeDialogOpen] = useState(false);
+	const [tradeSubmitting, setTradeSubmitting] = useState(false);
+	const [pendingTxOpen, setPendingTxOpen] = useState(false);
 	const [sortOption, setSortOption] = useState<SortOption>(() => {
 		if (typeof window === 'undefined') return 'featured';
 		const saved = window.localStorage.getItem(CREATOR_SORT_KEY) as SortOption | null;
@@ -215,8 +224,49 @@ function LandingPage() {
 
 	const handleResetSearch = () => setSearchQuery('');
 
+	const openTradeDialog = (side: TradeSide) => {
+		setTradeSide(side);
+		setTradeDialogOpen(true);
+	};
+
+	const handleConfirmTrade = async (amount: number) => {
+		const previousHoldings = featuredHoldings;
+		setTradeSubmitting(true);
+		setPendingTxOpen(true);
+
+		try {
+			showToast.loading(
+				tradeSide === 'buy'
+					? `Submitting buy for ${amount} key${amount === 1 ? '' : 's'}...`
+					: `Submitting sell for ${amount} key${amount === 1 ? '' : 's'}...`
+			);
+
+			await new Promise<void>(resolve => window.setTimeout(resolve, 900));
+
+			setFeaturedHoldings(current =>
+				tradeSide === 'buy' ? current + amount : Math.max(0, current - amount)
+			);
+
+			await new Promise<void>(resolve => window.setTimeout(resolve, 250));
+
+			showToast.transactionSuccess(
+				'Trade confirmed',
+				tradeSide === 'buy'
+					? `Holdings refreshed: +${formatNumber(amount)} keys.`
+					: `Holdings refreshed: -${formatNumber(amount)} keys.`
+			);
+			setTradeDialogOpen(false);
+		} catch {
+			setFeaturedHoldings(previousHoldings);
+			showToast.error('Trade failed. Holdings have been restored.');
+		} finally {
+			setTradeSubmitting(false);
+			setPendingTxOpen(false);
+		}
+	};
+
 	return (
-		<main className="relative min-h-screen overflow-x-hidden bg-[linear-gradient(160deg,#08111f_0%,#10213b_45%,#f0b14d_160%)] px-6 py-12 md:px-12">
+		<main className="relative min-h-screen overflow-x-hidden bg-[linear-gradient(160deg,#08111f_0%,#10213b_45%,#f0b14d_160%)] px-6 pt-12 pb-28 md:px-12 md:pb-12">
 			<div className="absolute left-[-4rem] top-[10%] size-72 rounded-full bg-amber-300/20 blur-[100px]" />
 			<div className="absolute bottom-[8%] right-[-3rem] size-72 rounded-full bg-emerald-300/15 blur-[100px]" />
 			<div className="absolute inset-0 bg-[radial-gradient(circle_at_top,rgba(255,186,73,0.1),transparent_40%),radial-gradient(circle_at_bottom_left,rgba(74,222,128,0.08),transparent_35%)]" />
@@ -382,19 +432,83 @@ function LandingPage() {
 						</div>
 					</div>
 					<div className="space-y-3">
-						<CreatorProfileInfoGrid items={FEATURED_CREATOR_FACTS} />
+						<CreatorProfileInfoGrid
+							items={[
+								...FEATURED_CREATOR_FACTS,
+								{
+									label: 'Your holdings',
+									value: `${formatNumber(featuredHoldings)} keys`,
+								},
+							]}
+						/>
 						<CreatorLabeledStatRow
 							label="Creator Share Supply"
-							value="250 shares available"
+							value={`${formatCompactNumber(250)} shares available`}
 						/>
+						<div className="hidden md:flex items-center gap-3">
+							<Button className="rounded-xl" onClick={() => openTradeDialog('buy')}>
+								Buy
+							</Button>
+							<Button
+								className="rounded-xl"
+								variant="outline"
+								onClick={() => openTradeDialog('sell')}
+							>
+								Sell
+							</Button>
+						</div>
 					</div>
 				</MarketplaceSection>
 
+				<div className="fixed inset-x-0 bottom-0 z-40 border-t border-white/10 bg-slate-950/85 backdrop-blur-md md:hidden">
+					<div className="mx-auto flex max-w-7xl items-center justify-between gap-3 px-6 py-3">
+						<div className="min-w-0">
+							<div className="text-xs font-bold uppercase tracking-[0.22em] text-white/40">
+								Your holdings
+							</div>
+							<div className="truncate font-jakarta text-sm font-bold text-white/85">
+								{formatNumber(featuredHoldings)} keys
+							</div>
+						</div>
+						<div className="flex items-center gap-2">
+							<Button className="rounded-xl" size="sm" onClick={() => openTradeDialog('buy')}>
+								Buy
+							</Button>
+							<Button
+								className="rounded-xl"
+								size="sm"
+								variant="outline"
+								onClick={() => openTradeDialog('sell')}
+							>
+								Sell
+							</Button>
+						</div>
+					</div>
+				</div>
+
 				<SectionDivider title="Transaction timeline pattern" spacing="relaxed" />
 				<MarketplaceSection spacing="relaxed">
 					<EmptyTransactionTimelineState />
 				</MarketplaceSection>
 			</div>
+
+			<TradeDialog
+				open={tradeDialogOpen}
+				side={tradeSide}
+				creatorName="Alex Rivers"
+				availableHoldings={featuredHoldings}
+				isSubmitting={tradeSubmitting}
+				onOpenChange={setTradeDialogOpen}
+				onConfirm={handleConfirmTrade}
+			/>
+			<PendingTxModal
+				open={pendingTxOpen}
+				onOpenChange={setPendingTxOpen}
+				isLoading={true}
+				blockDismissal={true}
+				title="Confirming trade"
+				description="Waiting for Stellar confirmation, then refreshing holdings."
+			/>
 		</main>
 	);
 }
diff --git a/src/utils/numberFormat.utils.ts b/src/utils/numberFormat.utils.ts
new file mode 100644
index 00000000..d4b57232
--- /dev/null
+++ b/src/utils/numberFormat.utils.ts
@@ -0,0 +1,41 @@
+export type NumberFormatStyle = 'full' | 'compact';
+
+export interface FormatNumberOptions {
+	style?: NumberFormatStyle;
+	maximumFractionDigits?: number;
+	minimumFractionDigits?: number;
+}
+
+function getNumberFormatter({
+	style = 'full',
+	maximumFractionDigits,
+	minimumFractionDigits,
+}: FormatNumberOptions) {
+	const resolvedMaximumFractionDigits =
+		maximumFractionDigits ?? (style === 'compact' ? 1 : 2);
+	const resolvedMinimumFractionDigits = minimumFractionDigits ?? 0;
+
+	return new Intl.NumberFormat(undefined, {
+		notation: style === 'compact' ? 'compact' : 'standard',
+		compactDisplay: 'short',
+		maximumFractionDigits: resolvedMaximumFractionDigits,
+		minimumFractionDigits: resolvedMinimumFractionDigits,
+	});
+}
+
+export function formatNumber(
+	value: number | null | undefined,
+	options: FormatNumberOptions = {}
+): string {
+	if (value == null) return '—';
+	if (!Number.isFinite(value)) return '—';
+	return getNumberFormatter(options).format(value);
+}
+
+export function formatCompactNumber(
+	value: number | null | undefined,
+	options: Omit<FormatNumberOptions, 'style'> = {}
+): string {
+	return formatNumber(value, { ...options, style: 'compact' });
+}
+