diff --git a/apps/web/src/components/Basenames/PremiumExplainerModal/index.tsx b/apps/web/src/components/Basenames/PremiumExplainerModal/index.tsx
index 6ada5f9bbe5..c08247c0e2b 100644
--- a/apps/web/src/components/Basenames/PremiumExplainerModal/index.tsx
+++ b/apps/web/src/components/Basenames/PremiumExplainerModal/index.tsx
@@ -1,18 +1,18 @@
 import Modal from 'apps/web/src/components/Modal';
 import data from 'apps/web/src/data/usernamePriceDecayTable.json';
-import { useBasenamesLaunchTime } from 'apps/web/src/hooks/useBasenamesLaunchTime';
+import { useBasenamesNameExpires } from 'apps/web/src/hooks/useBasenamesNameExpires';
 import { CartesianGrid, Line, LineChart, ResponsiveContainer, Tooltip } from 'recharts';
 import { formatEther } from 'viem';
 
 type CustomTooltipProps = {
   active?: boolean;
   baseSingleYearEthCost?: bigint;
-  launchTimeSeconds?: bigint;
+  auctionStartTimeSeconds?: bigint;
   payload: [
     {
       dataKey: 'premium';
       name: 'premium';
-      payload: { hours: number; premium: number };
+      payload: { days: number; premium: number };
       value: number;
     },
   ];
@@ -22,13 +22,13 @@ function CustomTooltip({
   active,
   payload,
   baseSingleYearEthCost,
-  launchTimeSeconds,
+  auctionStartTimeSeconds,
 }: CustomTooltipProps) {
-  if (active && payload?.length && launchTimeSeconds && baseSingleYearEthCost) {
+  if (active && payload?.length && auctionStartTimeSeconds && baseSingleYearEthCost) {
     const premium = payload[0].value;
-    const hours = payload[0].payload.hours;
-    const seconds = hours * 60 * 60;
-    const tooltipSeconds = seconds + Number(launchTimeSeconds);
+    const days = payload[0].payload.days;
+    const seconds = days * 24 * 60 * 60; // Convert days to seconds
+    const tooltipSeconds = seconds + Number(auctionStartTimeSeconds);
     const timeOfPremium = new Date(tooltipSeconds * 1000).toLocaleString(undefined, {
       year: 'numeric',
       month: '2-digit',
@@ -65,6 +65,7 @@ type PremiumExplainerModalProps = {
   toggleModal: () => void;
   premiumEthAmount: bigint | undefined;
   baseSingleYearEthCost: bigint;
+  name: string;
 };
 const chartMarginValues = { top: 2, right: 2, left: 2, bottom: 2 };
 export function PremiumExplainerModal({
@@ -72,8 +73,9 @@ export function PremiumExplainerModal({
   toggleModal,
   premiumEthAmount,
   baseSingleYearEthCost,
+  name,
 }: PremiumExplainerModalProps) {
-  const { data: launchTimeSeconds } = useBasenamesLaunchTime();
+  const { data: auctionStartTimeSeconds } = useBasenamesNameExpires(name);
 
   if (!premiumEthAmount || !baseSingleYearEthCost) return null;
   const formattedOneYearCost = Number(formatEther(baseSingleYearEthCost)).toLocaleString(
@@ -94,8 +96,8 @@ export function PremiumExplainerModal({
       <div className="flex max-w-[491px] flex-1 flex-col gap-3">
         <h1 className="w-full text-2xl font-bold">This name has a temporary premium</h1>
         <p className="mb-3 text-illoblack">
-          To ensure fair distribution of Basenames, all names have a temporary premium starting at
-          100 ETH that then decays exponentially to 0 over 36 hours.
+          To ensure fair distribution of recently expired Basenames, all names have a price premium
+          which starts at 100 ETH that then decays exponentially to 0 over 21 days.
         </p>
         <div className="grid  grid-cols-2 grid-rows-4">
           <div className="col-span-2 mb-2 text-sm font-medium uppercase text-gray-60">
@@ -147,7 +149,7 @@ export function PremiumExplainerModal({
                   // @ts-expect-error type wants an unnecessary prop
                   <CustomTooltip
                     baseSingleYearEthCost={baseSingleYearEthCost}
-                    launchTimeSeconds={launchTimeSeconds}
+                    auctionStartTimeSeconds={auctionStartTimeSeconds}
                   />
                 }
               />
diff --git a/apps/web/src/components/Basenames/RegistrationForm/index.tsx b/apps/web/src/components/Basenames/RegistrationForm/index.tsx
index cae6463d344..e98515ce293 100644
--- a/apps/web/src/components/Basenames/RegistrationForm/index.tsx
+++ b/apps/web/src/components/Basenames/RegistrationForm/index.tsx
@@ -138,7 +138,7 @@ export default function RegistrationForm() {
   const usdPrice = hasResolvedUSDPrice ? formatUsdPrice(price, ethUsdPrice) : '--.--';
   const nameIsFree = !hasRegisteredWithDiscount && price === 0n;
 
-  const { seconds, timestamp: premiumEndTimestamp } = usePremiumEndDurationRemaining();
+  const { seconds, timestamp: premiumEndTimestamp } = usePremiumEndDurationRemaining(selectedName);
 
   const isPremiumActive = Boolean(premiumPrice && premiumPrice !== 0n && seconds !== 0n);
   const mainRegistrationElementClasses = classNames(
@@ -331,6 +331,7 @@ export default function RegistrationForm() {
           baseSingleYearEthCost={singleYearBasePrice}
           isOpen={premiumExplainerModalOpen}
           toggleModal={togglePremiumExplainerModal}
+          name={selectedName}
         />
       )}
     </>
diff --git a/apps/web/src/data/usernamePriceDecayTable.json b/apps/web/src/data/usernamePriceDecayTable.json
index 2c19c152a85..4edc14e425a 100644
--- a/apps/web/src/data/usernamePriceDecayTable.json
+++ b/apps/web/src/data/usernamePriceDecayTable.json
@@ -1,1446 +1,846 @@
 [
   {
-    "hours": 0,
-    "premium": 99.99999404
+    "days": 0,
+    "premium": 100
   },
   {
-    "hours": 0.1,
-    "premium": 95.48415443
+    "days": 0.1,
+    "premium": 93.30329915
   },
   {
-    "hours": 0.2,
-    "premium": 91.1722429
+    "days": 0.2,
+    "premium": 87.05505633
   },
   {
-    "hours": 0.3,
-    "premium": 87.05505037
+    "days": 0.3,
+    "premium": 81.22523964
   },
   {
-    "hours": 0.4,
-    "premium": 83.12378365
+    "days": 0.4,
+    "premium": 75.78582833
   },
   {
-    "hours": 0.5,
-    "premium": 79.37004664
+    "days": 0.5,
+    "premium": 70.71067812
   },
   {
-    "hours": 0.6,
-    "premium": 75.78582237
+    "days": 0.6,
+    "premium": 65.97539554
   },
   {
-    "hours": 0.7,
-    "premium": 72.36345591
+    "days": 0.7,
+    "premium": 61.55722067
   },
   {
-    "hours": 0.8,
-    "premium": 69.09563804
+    "days": 0.8,
+    "premium": 57.43491775
   },
   {
-    "hours": 0.9,
-    "premium": 65.97538958
+    "days": 0.9,
+    "premium": 53.58867313
   },
   {
-    "hours": 1,
-    "premium": 62.99604653
+    "days": 1,
+    "premium": 50
   },
   {
-    "hours": 1.1,
-    "premium": 60.15124584
+    "days": 1.1,
+    "premium": 46.65164958
   },
   {
-    "hours": 1.2,
-    "premium": 57.43491179
+    "days": 1.2,
+    "premium": 43.52752816
   },
   {
-    "hours": 1.3,
-    "premium": 54.84124302
+    "days": 1.3,
+    "premium": 40.61261982
   },
   {
-    "hours": 1.4,
-    "premium": 52.36470018
+    "days": 1.4,
+    "premium": 37.89291416
   },
   {
-    "hours": 1.5,
-    "premium": 49.99999404
+    "days": 1.5,
+    "premium": 35.35533906
   },
   {
-    "hours": 1.6,
-    "premium": 47.74207424
+    "days": 1.6,
+    "premium": 32.98769777
   },
   {
-    "hours": 1.7,
-    "premium": 45.58611847
+    "days": 1.7,
+    "premium": 30.77861033
   },
   {
-    "hours": 1.8,
-    "premium": 43.5275222
+    "days": 1.8,
+    "premium": 28.71745887
   },
   {
-    "hours": 1.9,
-    "premium": 41.56188885
+    "days": 1.9,
+    "premium": 26.79433656
   },
   {
-    "hours": 2,
-    "premium": 39.68502034
+    "days": 2,
+    "premium": 25
   },
   {
-    "hours": 2.1,
-    "premium": 37.8929082
+    "days": 2.1,
+    "premium": 23.32582479
   },
   {
-    "hours": 2.2,
-    "premium": 36.18172498
+    "days": 2.2,
+    "premium": 21.76376408
   },
   {
-    "hours": 2.3,
-    "premium": 34.54781604
+    "days": 2.3,
+    "premium": 20.30630991
   },
   {
-    "hours": 2.4,
-    "premium": 32.98769181
+    "days": 2.4,
+    "premium": 18.94645708
   },
   {
-    "hours": 2.5,
-    "premium": 31.49802029
+    "days": 2.5,
+    "premium": 17.67766953
   },
   {
-    "hours": 2.6,
-    "premium": 30.07561994
+    "days": 2.6,
+    "premium": 16.49384888
   },
   {
-    "hours": 2.7,
-    "premium": 28.71745291
+    "days": 2.7,
+    "premium": 15.38930517
   },
   {
-    "hours": 2.8,
-    "premium": 27.42061853
+    "days": 2.8,
+    "premium": 14.35872944
   },
   {
-    "hours": 2.9,
-    "premium": 26.18234711
+    "days": 2.9,
+    "premium": 13.39716828
   },
   {
-    "hours": 3,
-    "premium": 24.99999404
+    "days": 3,
+    "premium": 12.5
   },
   {
-    "hours": 3.1,
-    "premium": 23.87103414
+    "days": 3.1,
+    "premium": 11.66291239
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   {
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-    "premium": 22.79305625
+    "days": 3.2,
+    "premium": 10.88188204
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+    "days": 3.3,
+    "premium": 10.15315495
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+    "days": 3.4,
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+    "days": 3.5,
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+    "days": 3.6,
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+    "days": 4,
+    "premium": 6.25
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-    "premium": 0.0001761611183
-  },
-  {
-    "hours": 28.7,
-    "premium": 0.0001679367997
-  },
-  {
-    "hours": 28.8,
-    "premium": 0.0001600838782
-  },
-  {
-    "hours": 28.9,
-    "premium": 0.000152585582
-  },
-  {
-    "hours": 29,
-    "premium": 0.0001454258968
-  },
-  {
-    "hours": 29.1,
-    "premium": 0.0001385895316
-  },
-  {
-    "hours": 29.2,
-    "premium": 0.0001320618856
-  },
-  {
-    "hours": 29.3,
-    "premium": 0.0001258290176
-  },
-  {
-    "hours": 29.4,
-    "premium": 0.000119877616
-  },
-  {
-    "hours": 29.5,
-    "premium": 0.0001141949701
-  },
-  {
-    "hours": 29.6,
-    "premium": 0.0001087689434
-  },
-  {
-    "hours": 29.7,
-    "premium": 0.0001035879474
-  },
-  {
-    "hours": 29.8,
-    "premium": 0.00009864091679
-  },
-  {
-    "hours": 29.9,
-    "premium": 0.00009391728619
-  },
-  {
-    "hours": 30,
-    "premium": 0.00008940696716
-  },
-  {
-    "hours": 30.1,
-    "premium": 0.00008510032691
-  },
-  {
-    "hours": 30.2,
-    "premium": 0.00008098816763
-  },
-  {
-    "hours": 30.3,
-    "premium": 0.00007706170686
-  },
-  {
-    "hours": 30.4,
-    "premium": 0.00007331255876
-  },
-  {
-    "hours": 30.5,
-    "premium": 0.00006973271618
-  },
-  {
-    "hours": 30.6,
-    "premium": 0.00006631453354
-  },
-  {
-    "hours": 30.7,
-    "premium": 0.00006305071056
-  },
-  {
-    "hours": 30.8,
-    "premium": 0.00005993427658
-  },
-  {
-    "hours": 30.9,
-    "premium": 0.00005695857576
-  },
-  {
-    "hours": 31,
-    "premium": 0.00005411725282
-  },
-  {
-    "hours": 31.1,
-    "premium": 0.00005140423947
-  },
-  {
-    "hours": 31.2,
-    "premium": 0.00004881374144
-  },
-  {
-    "hours": 31.3,
-    "premium": 0.00004634022616
-  },
-  {
-    "hours": 31.4,
-    "premium": 0.00004397841085
-  },
-  {
-    "hours": 31.5,
-    "premium": 0.00004172325134
-  },
-  {
-    "hours": 31.6,
-    "premium": 0.00003956993122
-  },
-  {
-    "hours": 31.7,
-    "premium": 0.00003751385157
-  },
-  {
-    "hours": 31.8,
-    "premium": 0.00003555062119
-  },
-  {
-    "hours": 31.9,
-    "premium": 0.00003367604714
-  },
-  {
-    "hours": 32,
-    "premium": 0.00003188612585
-  },
-  {
-    "hours": 32.1,
-    "premium": 0.00003017703453
-  },
-  {
-    "hours": 32.2,
-    "premium": 0.00002854512304
-  },
-  {
-    "hours": 32.3,
-    "premium": 0.00002698690605
-  },
-  {
-    "hours": 32.4,
-    "premium": 0.00002549905564
-  },
-  {
-    "hours": 32.5,
-    "premium": 0.00002407839417
-  },
-  {
-    "hours": 32.6,
-    "premium": 0.00002272188749
-  },
-  {
-    "hours": 32.7,
-    "premium": 0.00002142663848
-  },
-  {
-    "hours": 32.8,
-    "premium": 0.00002018988084
-  },
-  {
-    "hours": 32.9,
-    "premium": 0.00001900897319
-  },
-  {
-    "hours": 33,
-    "premium": 0.00001788139343
-  },
-  {
-    "hours": 33.1,
-    "premium": 0.00001680473337
-  },
-  {
-    "hours": 33.2,
-    "premium": 0.00001577669355
-  },
-  {
-    "hours": 33.3,
-    "premium": 0.00001479507836
-  },
-  {
-    "hours": 33.4,
-    "premium": 0.00001385779133
-  },
-  {
-    "hours": 33.5,
-    "premium": 0.00001296283069
-  },
-  {
-    "hours": 33.6,
-    "premium": 0.00001210828503
-  },
-  {
-    "hours": 33.7,
-    "premium": 0.00001129232928
-  },
-  {
-    "hours": 33.8,
-    "premium": 0.00001051322079
-  },
-  {
-    "hours": 33.9,
-    "premium": 0.000009769295582
-  },
-  {
-    "hours": 34,
-    "premium": 0.000009058964847
-  },
-  {
-    "hours": 34.1,
-    "premium": 0.000008380711508
-  },
-  {
-    "hours": 34.2,
-    "premium": 0.000007733087003
-  },
-  {
-    "hours": 34.3,
-    "premium": 0.000007114708181
-  },
-  {
-    "hours": 34.4,
-    "premium": 0.000006524254355
-  },
-  {
-    "hours": 34.5,
-    "premium": 0.000005960464477
-  },
-  {
-    "hours": 34.6,
-    "premium": 0.000005422134446
-  },
-  {
-    "hours": 34.7,
-    "premium": 0.000004908114535
-  },
-  {
-    "hours": 34.8,
-    "premium": 0.000004417306939
-  },
-  {
-    "hours": 34.9,
-    "premium": 0.000003948663427
-  },
-  {
-    "hours": 35,
-    "premium": 0.000003501183104
-  },
-  {
-    "hours": 35.1,
-    "premium": 0.000003073910275
-  },
-  {
-    "hours": 35.2,
-    "premium": 0.000002665932401
-  },
-  {
-    "hours": 35.3,
-    "premium": 0.000002276378154
-  },
-  {
-    "hours": 35.4,
-    "premium": 0.000001904415552
-  },
-  {
-    "hours": 35.5,
-    "premium": 0.000001549250184
-  },
-  {
-    "hours": 35.6,
-    "premium": 0.000001210123515
-  },
-  {
-    "hours": 35.7,
-    "premium": 8.86311262e-7
-  },
-  {
-    "hours": 35.8,
-    "premium": 5.77121852e-7
-  },
-  {
-    "hours": 35.9,
-    "premium": 2.81894939e-7
-  },
-  {
-    "hours": 36,
+    "days": 21,
     "premium": 0
   }
 ]
diff --git a/apps/web/src/hooks/useActiveEthPremiumAmount.ts b/apps/web/src/hooks/useActiveEthPremiumAmount.ts
index 8fb0c9726b9..f1456efc52a 100644
--- a/apps/web/src/hooks/useActiveEthPremiumAmount.ts
+++ b/apps/web/src/hooks/useActiveEthPremiumAmount.ts
@@ -1,11 +1,11 @@
-import { useBasenamesLaunchTime } from 'apps/web/src/hooks/useBasenamesLaunchTime';
+import { useBasenamesNameExpires } from 'apps/web/src/hooks/useBasenamesNameExpires';
 import { useState } from 'react';
 import { useInterval } from 'usehooks-ts';
 
 const SECONDS_IN_A_MINUTE = 60;
 const SECONDS_IN_AN_HOUR = 60 * SECONDS_IN_A_MINUTE;
 const SECONDS_IN_A_DAY = 24 * SECONDS_IN_AN_HOUR;
-const THIRTY_SIX_HOURS_IN_SECONDS = 36 * SECONDS_IN_AN_HOUR;
+const TWENTY_ONE_DAYS_IN_SECONDS = 21 * SECONDS_IN_A_DAY;
 
 function formatTimeUnit(unit: number): string {
   return unit.toString().padStart(2, '0');
@@ -22,15 +22,15 @@ function calculateTimeLeft(differenceInSeconds: number): string {
   )}:${formatTimeUnit(seconds)}`;
 }
 
-export function usePremiumEndDurationRemaining() {
+export function usePremiumEndDurationRemaining(name: string) {
   const [timeLeft, setTimeLeft] = useState<string | null>(null);
-  const { data: launchTimeSeconds } = useBasenamesLaunchTime();
+  const { data: auctionStartTimeSeconds } = useBasenamesNameExpires(name);
 
   useInterval(() => {
-    if (!launchTimeSeconds) return;
+    if (!auctionStartTimeSeconds) return;
 
     const currentTimeInSeconds = Math.floor(Date.now() / 1000);
-    const endTimeInSeconds = Number(launchTimeSeconds) + THIRTY_SIX_HOURS_IN_SECONDS;
+    const endTimeInSeconds = Number(auctionStartTimeSeconds) + TWENTY_ONE_DAYS_IN_SECONDS;
     const timeDifference = endTimeInSeconds - currentTimeInSeconds;
 
     if (timeDifference > 0) {
@@ -40,5 +40,5 @@ export function usePremiumEndDurationRemaining() {
     }
   }, 1000);
 
-  return { seconds: launchTimeSeconds, timestamp: timeLeft };
+  return { seconds: auctionStartTimeSeconds, timestamp: timeLeft };
 }
diff --git a/apps/web/src/hooks/useActivePremiumAmount.ts b/apps/web/src/hooks/useActivePremiumAmount.ts
deleted file mode 100644
index 391ec9ba720..00000000000
--- a/apps/web/src/hooks/useActivePremiumAmount.ts
+++ /dev/null
@@ -1,25 +0,0 @@
-import ExponentialPremiumPriceOracleABI from 'apps/web/src/abis/ExponentialPremiumPriceOracleAbi';
-import { EXPONENTIAL_PREMIUM_PRICE_ORACLE } from 'apps/web/src/addresses/usernames';
-import { useBasenamesLaunchTime } from 'apps/web/src/hooks/useBasenamesLaunchTime';
-import { useMemo } from 'react';
-import { useReadContract } from 'wagmi';
-import { base } from 'viem/chains';
-
-export function useActiveEthPremiumAmount() {
-  const { data: launchTimeSeconds } = useBasenamesLaunchTime();
-
-  const timeSinceLaunch = useMemo(
-    () => (launchTimeSeconds ? BigInt(Math.floor(Date.now() / 1000)) - launchTimeSeconds : null),
-    [launchTimeSeconds],
-  );
-
-  return useReadContract({
-    abi: ExponentialPremiumPriceOracleABI,
-    address: EXPONENTIAL_PREMIUM_PRICE_ORACLE[base.id],
-    functionName: 'decayedPremium',
-    args: [timeSinceLaunch as bigint],
-    query: {
-      enabled: typeof timeSinceLaunch === 'bigint',
-    },
-  });
-}
diff --git a/apps/web/src/hooks/useBasenamesLaunchTime.ts b/apps/web/src/hooks/useBasenamesLaunchTime.ts
deleted file mode 100644
index 93529a54d1a..00000000000
--- a/apps/web/src/hooks/useBasenamesLaunchTime.ts
+++ /dev/null
@@ -1,4 +0,0 @@
-export function useBasenamesLaunchTime() {
-  // Temporarily hardcoded from RegistrarController
-  return { data: 1724184000n };
-}
diff --git a/apps/web/src/hooks/useBasenamesNameExpires.ts b/apps/web/src/hooks/useBasenamesNameExpires.ts
new file mode 100644
index 00000000000..24aa4b1234e
--- /dev/null
+++ b/apps/web/src/hooks/useBasenamesNameExpires.ts
@@ -0,0 +1,32 @@
+import { useReadContract } from 'wagmi';
+import BaseRegistrarAbi from 'apps/web/src/abis/BaseRegistrarAbi';
+import { USERNAME_BASE_REGISTRAR_ADDRESSES } from 'apps/web/src/addresses/usernames';
+import {
+  getTokenIdFromBasename,
+  formatBaseEthDomain,
+  getChainForBasename,
+  GRACE_PERIOD_DURATION_SECONDS,
+} from 'apps/web/src/utils/usernames';
+import { Basename } from '@coinbase/onchainkit/identity';
+
+export function useBasenamesNameExpires(name: string) {
+  // Convert name to full basename format
+  const fullBasename = name.includes('.') ? (name as Basename) : formatBaseEthDomain(name, 8453); // Base mainnet
+  const chain = getChainForBasename(fullBasename);
+  const tokenId = getTokenIdFromBasename(fullBasename);
+
+  const { data: nameExpiresTimestamp } = useReadContract({
+    abi: BaseRegistrarAbi,
+    address: USERNAME_BASE_REGISTRAR_ADDRESSES[chain.id],
+    functionName: 'nameExpires',
+    args: [tokenId],
+    chainId: chain.id,
+  });
+
+  // Add 90 days (grace period) to get the auction start time
+  const auctionStartTime = nameExpiresTimestamp
+    ? nameExpiresTimestamp + BigInt(GRACE_PERIOD_DURATION_SECONDS)
+    : undefined;
+
+  return { data: auctionStartTime };
+}
diff --git a/apps/web/src/utils/usernames.ts b/apps/web/src/utils/usernames.ts
index d410ce8eb3c..2af1a89cc87 100644
--- a/apps/web/src/utils/usernames.ts
+++ b/apps/web/src/utils/usernames.ts
@@ -831,8 +831,9 @@ export const REGISTER_CONTRACT_ADDRESSES = UPGRADEABLE_REGISTRAR_CONTROLLER_ADDR
 
 export const isBasenameRenewalsKilled = process.env.NEXT_PUBLIC_KILL_BASENAMES_RENEWALS === 'true';
 
-// Grace period duration in seconds (90 days)
-export const GRACE_PERIOD_DURATION_MS = 90 * 24 * 60 * 60 * 1000;
+// Grace period duration (90 days)
+export const GRACE_PERIOD_DURATION_SECONDS = 90 * 24 * 60 * 60;
+export const GRACE_PERIOD_DURATION_MS = GRACE_PERIOD_DURATION_SECONDS * 1000;
 
 /**
  * Check if a basename is in its grace period (expired but still renewable)