diff --git a/.gas-snapshot b/.gas-snapshot
index 8121701..d6eedf7 100644
--- a/.gas-snapshot
+++ b/.gas-snapshot
@@ -9,53 +9,54 @@ ACLManagerTest:testGrantRole() (gas: 23547)
 ACLManagerTest:testRenounceRole() (gas: 27841)
 ACLManagerTest:testRoles() (gas: 15393)
 ACLManagerTest:testTransferRole() (gas: 21528)
-BillboardTest:testAddToWhitelist() (gas: 37249)
-BillboardTest:testApproveAndTransfer() (gas: 164045)
+BillboardTest:testAddToWhitelist() (gas: 37205)
+BillboardTest:testApproveAndTransfer() (gas: 162759)
 BillboardTest:testCalculateTax() (gas: 29439)
-BillboardTest:testCannnotWithdrawTaxIfSmallAmount(uint8) (runs: 256, μ: 424231, ~: 437543)
-BillboardTest:testCannnotWithdrawTaxIfZero() (gas: 389746)
+BillboardTest:testCannnotWithdrawTaxIfSmallAmount(uint8) (runs: 256, μ: 420946, ~: 434258)
+BillboardTest:testCannnotWithdrawTaxIfZero() (gas: 386461)
 BillboardTest:testCannotAddToWhitelistByAttacker() (gas: 11794)
-BillboardTest:testCannotApproveByAttacker() (gas: 131697)
-BillboardTest:testCannotClearAuctionIfAuctionNotEnded() (gas: 605694)
-BillboardTest:testCannotClearAuctionOnNewBoard() (gas: 139540)
-BillboardTest:testCannotMintBoardByAttacker() (gas: 13970)
-BillboardTest:testCannotPlaceBidByAttacker() (gas: 145713)
-BillboardTest:testCannotPlaceBidTwice(uint96) (runs: 256, μ: 652059, ~: 658290)
-BillboardTest:testCannotRemoveToWhitelistByAttacker() (gas: 11883)
-BillboardTest:testCannotSafeTransferByAttacker() (gas: 129499)
-BillboardTest:testCannotSetBoardProprtiesByAttacker() (gas: 162855)
+BillboardTest:testCannotApproveByAttacker() (gas: 130412)
+BillboardTest:testCannotClearAuctionIfAuctionNotEnded() (gas: 604409)
+BillboardTest:testCannotClearAuctionOnNewBoard() (gas: 136255)
+BillboardTest:testCannotMintBoardByAttacker() (gas: 13993)
+BillboardTest:testCannotPlaceBidByAttacker() (gas: 142428)
+BillboardTest:testCannotPlaceBidTwice(uint96) (runs: 256, μ: 650773, ~: 657004)
+BillboardTest:testCannotRemoveToWhitelistByAttacker() (gas: 11861)
+BillboardTest:testCannotSafeTransferByAttacker() (gas: 128214)
+BillboardTest:testCannotSetBoardProprtiesByAttacker() (gas: 159548)
 BillboardTest:testCannotSetIsOpenedByAttacker() (gas: 11751)
 BillboardTest:testCannotSetTaxRateByAttacker() (gas: 11763)
-BillboardTest:testCannotTransferByOperator() (gas: 134175)
-BillboardTest:testCannotTransferToZeroAddress() (gas: 129706)
-BillboardTest:testCannotUpgradeRegistryByAttacker() (gas: 11862)
-BillboardTest:testCannotWithBidTwice(uint96) (runs: 256, μ: 935690, ~: 935690)
-BillboardTest:testCannotWithdrawBidIfAuctionNotCleared(uint96) (runs: 256, μ: 772282, ~: 772282)
-BillboardTest:testCannotWithdrawBidIfAuctionNotEnded(uint96) (runs: 256, μ: 647468, ~: 647468)
-BillboardTest:testCannotWithdrawBidIfNotFound() (gas: 420497)
-BillboardTest:testCannotWithdrawBidIfWon(uint96) (runs: 256, μ: 742287, ~: 742287)
+BillboardTest:testCannotTransferByOperator() (gas: 132890)
+BillboardTest:testCannotTransferToZeroAddress() (gas: 128377)
+BillboardTest:testCannotUpgradeRegistryByAttacker() (gas: 11885)
+BillboardTest:testCannotWithBidTwice(uint96) (runs: 256, μ: 934384, ~: 934384)
+BillboardTest:testCannotWithdrawBidIfAuctionNotCleared(uint96) (runs: 256, μ: 770975, ~: 770975)
+BillboardTest:testCannotWithdrawBidIfAuctionNotEnded(uint96) (runs: 256, μ: 646138, ~: 646138)
+BillboardTest:testCannotWithdrawBidIfNotFound() (gas: 419189)
+BillboardTest:testCannotWithdrawBidIfWon(uint96) (runs: 256, μ: 740936, ~: 740936)
 BillboardTest:testCannotWithdrawTaxByAttacker() (gas: 21710)
-BillboardTest:testClearAuctionIfAuctionEnded() (gas: 650687)
-BillboardTest:testGetBids(uint8,uint8,uint8) (runs: 256, μ: 2814114, ~: 1451611)
-BillboardTest:testGetTokenURI() (gas: 156524)
+BillboardTest:testClearAuctionIfAuctionEnded() (gas: 649435)
+BillboardTest:testClearAuctionsIfAuctionEnded() (gas: 1205928)
+BillboardTest:testGetBids(uint8,uint8,uint8) (runs: 256, μ: 2877775, ~: 1456013)
+BillboardTest:testGetTokenURI() (gas: 155305)
 BillboardTest:testMintBoard() (gas: 225991)
 BillboardTest:testMintBoardByWhitelist() (gas: 157825)
 BillboardTest:testMintBoardIfOpened() (gas: 130863)
-BillboardTest:testPlaceBidByWhitelist() (gas: 473253)
-BillboardTest:testPlaceBidIfAuctionEnded() (gas: 938084)
-BillboardTest:testPlaceBidOnNewBoard(uint96) (runs: 256, μ: 488033, ~: 498752)
-BillboardTest:testPlaceBidWithHigherPrice(uint96) (runs: 256, μ: 767947, ~: 775021)
-BillboardTest:testPlaceBidWithSamePrices(uint96) (runs: 256, μ: 765873, ~: 777549)
-BillboardTest:testPlaceBidZeroPrice() (gas: 358961)
-BillboardTest:testRemoveToWhitelist() (gas: 24992)
-BillboardTest:testSafeTransferByOperator() (gas: 142575)
-BillboardTest:testSetBoardProperties() (gas: 308855)
-BillboardTest:testSetBoardPropertiesAfterTransfer() (gas: 339487)
-BillboardTest:testSetIsOpened() (gas: 15932)
+BillboardTest:testPlaceBidByWhitelist() (gas: 469968)
+BillboardTest:testPlaceBidIfAuctionEnded() (gas: 936799)
+BillboardTest:testPlaceBidOnNewBoard(uint96) (runs: 256, μ: 486781, ~: 497500)
+BillboardTest:testPlaceBidWithHigherPrice(uint96) (runs: 256, μ: 766505, ~: 773735)
+BillboardTest:testPlaceBidWithSamePrices(uint96) (runs: 256, μ: 764587, ~: 776263)
+BillboardTest:testPlaceBidZeroPrice() (gas: 357676)
+BillboardTest:testRemoveToWhitelist() (gas: 24939)
+BillboardTest:testSafeTransferByOperator() (gas: 141290)
+BillboardTest:testSetBoardProperties() (gas: 305548)
+BillboardTest:testSetBoardPropertiesAfterTransfer() (gas: 338157)
+BillboardTest:testSetIsOpened() (gas: 15978)
 BillboardTest:testSetTaxRate() (gas: 27263)
-BillboardTest:testUpgradeRegistry() (gas: 2590942)
-BillboardTest:testWithdrawBid(uint96) (runs: 256, μ: 936329, ~: 936329)
-BillboardTest:testWithdrawTax(uint96) (runs: 256, μ: 510766, ~: 510766)
+BillboardTest:testUpgradeRegistry() (gas: 2637423)
+BillboardTest:testWithdrawBid(uint96) (runs: 256, μ: 935022, ~: 935022)
+BillboardTest:testWithdrawTax(uint96) (runs: 256, μ: 509481, ~: 509481)
 CurationTest:testCannotCurateERC20CurateZeroAmount() (gas: 12194)
 CurationTest:testCannotCurateERC20EmptyURI() (gas: 15797)
 CurationTest:testCannotCurateERC20IfNotApproval() (gas: 21624)
diff --git a/src/Billboard/Billboard.sol b/src/Billboard/Billboard.sol
index c26e093..d813c76 100644
--- a/src/Billboard/Billboard.sol
+++ b/src/Billboard/Billboard.sol
@@ -168,6 +168,13 @@ contract Billboard is IBillboard {
         _clearAuction(tokenId_, _boardCreator, _nextAuctionId);
     }
 
+    /// @inheritdoc IBillboard
+    function clearAuctions(uint256[] calldata tokenIds_) external {
+        for (uint256 i = 0; i < tokenIds_.length; i++) {
+            clearAuction(tokenIds_[i]);
+        }
+    }
+
     function _clearAuction(uint256 tokenId_, address boardCreator_, uint256 nextAuctionId_) private {
         IBillboardRegistry.Auction memory _nextAuction = registry.getAuction(tokenId_, nextAuctionId_);
         IBillboardRegistry.Bid memory _highestBid = registry.getBid(
diff --git a/src/Billboard/IBillboard.sol b/src/Billboard/IBillboard.sol
index eec6db5..72b4f8c 100644
--- a/src/Billboard/IBillboard.sol
+++ b/src/Billboard/IBillboard.sol
@@ -142,6 +142,13 @@ interface IBillboard {
      */
     function clearAuction(uint256 tokenId_) external;
 
+    /**
+     * @notice Clear the next auction of mutiple boards.
+     *
+     * @param tokenIds_ Token IDs of boards.
+     */
+    function clearAuctions(uint256[] calldata tokenIds_) external;
+
     /**
      * @notice Place bid for the next auction of a board.
      *
diff --git a/src/test/Billboard/BillboardTest.t.sol b/src/test/Billboard/BillboardTest.t.sol
index 36dacf3..23fdabf 100644
--- a/src/test/Billboard/BillboardTest.t.sol
+++ b/src/test/Billboard/BillboardTest.t.sol
@@ -623,6 +623,80 @@ contract BillboardTest is BillboardTestBase {
         assertEq(_bid.isWithdrawn, false);
     }
 
+    function testClearAuctionsIfAuctionEnded() public {
+        (uint256 _tokenId, uint256 _prevAuctionId) = _mintBoardAndPlaceBid();
+        (uint256 _tokenId2, uint256 _prevAuctionId2) = _mintBoardAndPlaceBid();
+
+        uint64 _placedAt = uint64(block.timestamp);
+        uint64 _clearedAt = uint64(block.timestamp) + registry.leaseTerm() + 1 minutes;
+
+        // place bids
+        vm.startPrank(USER_A);
+        vm.deal(USER_A, 0);
+        operator.placeBid{value: 0}(_tokenId, 0);
+
+        vm.startPrank(USER_B);
+        vm.deal(USER_B, 0);
+        operator.placeBid{value: 0}(_tokenId2, 0);
+
+        // clear auction
+        vm.expectEmit(true, true, true, true);
+        emit IBillboardRegistry.AuctionCleared(
+            _tokenId,
+            _prevAuctionId + 1,
+            USER_A,
+            _clearedAt,
+            _clearedAt + registry.leaseTerm()
+        );
+        vm.expectEmit(true, true, true, true);
+        emit IBillboardRegistry.AuctionCleared(
+            _tokenId2,
+            _prevAuctionId2 + 1,
+            USER_B,
+            _clearedAt,
+            _clearedAt + registry.leaseTerm()
+        );
+
+        vm.warp(_clearedAt);
+
+        uint256[] memory _tokenIds = new uint256[](2);
+        _tokenIds[0] = _tokenId;
+        _tokenIds[1] = _tokenId2;
+        operator.clearAuctions(_tokenIds);
+
+        // check auction
+        uint256 _nextAuctionId = registry.nextBoardAuctionId(_tokenId);
+        IBillboardRegistry.Auction memory _auction = registry.getAuction(_tokenId, _nextAuctionId);
+        assertEq(_auction.startAt, _placedAt);
+        assertEq(_auction.endAt, _placedAt + registry.leaseTerm());
+        assertEq(_auction.leaseStartAt, _clearedAt);
+        assertEq(_auction.leaseEndAt, _clearedAt + registry.leaseTerm());
+        assertEq(_auction.highestBidder, USER_A);
+
+        uint256 _nextAuctionId2 = registry.nextBoardAuctionId(_tokenId2);
+        IBillboardRegistry.Auction memory _auction2 = registry.getAuction(_tokenId2, _nextAuctionId2);
+        assertEq(_auction2.startAt, _placedAt);
+        assertEq(_auction2.endAt, _placedAt + registry.leaseTerm());
+        assertEq(_auction2.leaseStartAt, _clearedAt);
+        assertEq(_auction2.leaseEndAt, _clearedAt + registry.leaseTerm());
+        assertEq(_auction2.highestBidder, USER_B);
+
+        // check bid
+        IBillboardRegistry.Bid memory _bid = registry.getBid(_tokenId, _nextAuctionId, USER_A);
+        assertEq(_bid.price, 0);
+        assertEq(_bid.tax, 0);
+        assertEq(_bid.placedAt, _placedAt);
+        assertEq(_bid.isWon, true);
+        assertEq(_bid.isWithdrawn, false);
+
+        IBillboardRegistry.Bid memory _bid2 = registry.getBid(_tokenId2, _nextAuctionId2, USER_B);
+        assertEq(_bid2.price, 0);
+        assertEq(_bid2.tax, 0);
+        assertEq(_bid2.placedAt, _placedAt);
+        assertEq(_bid2.isWon, true);
+        assertEq(_bid2.isWithdrawn, false);
+    }
+
     function testCannotClearAuctionOnNewBoard() public {
         uint256 _mintedAt = block.timestamp;
         uint256 _clearedAt = _mintedAt + 1;
diff --git a/src/test/Billboard/BillboardTestBase.t.sol b/src/test/Billboard/BillboardTestBase.t.sol
index 7a26dec..b866779 100644
--- a/src/test/Billboard/BillboardTestBase.t.sol
+++ b/src/test/Billboard/BillboardTestBase.t.sol
@@ -43,7 +43,6 @@ contract BillboardTestBase is Test {
     function _mintBoard() public returns (uint256 tokenId) {
         vm.prank(ADMIN);
         tokenId = operator.mintBoard(ADMIN);
-        assertEq(registry.balanceOf(ADMIN), 1);
     }
 
     function _mintBoardAndPlaceBid() public returns (uint256 tokenId, uint256 _nextAuctionId) {