diff --git a/codex/contracts/market.nim b/codex/contracts/market.nim
index 1595b449..3ca0d0e6 100644
--- a/codex/contracts/market.nim
+++ b/codex/contracts/market.nim
@@ -247,6 +247,21 @@ method canProofBeMarkedAsMissing*(
     trace "Proof cannot be marked as missing", msg = e.msg
     return false
 
+method reserveSlot*(
+  market: OnChainMarket,
+  requestId: RequestId,
+  slotIndex: UInt256) {.async.} =
+
+  convertEthersError:
+    discard await market.contract.reserveSlot(requestId, slotIndex).confirm(0)
+
+method canReserveSlot*(
+  market: OnChainMarket,
+  requestId: RequestId,
+  slotIndex: UInt256): Future[bool] {.async.} =
+
+  await market.contract.canReserveSlot(requestId, slotIndex)
+
 method subscribeRequests*(market: OnChainMarket,
                          callback: OnRequest):
                         Future[MarketSubscription] {.async.} =
diff --git a/codex/contracts/marketplace.nim b/codex/contracts/marketplace.nim
index f98b9a80..6425bfa0 100644
--- a/codex/contracts/marketplace.nim
+++ b/codex/contracts/marketplace.nim
@@ -51,3 +51,6 @@ proc getPointer*(marketplace: Marketplace, id: SlotId): uint8 {.contract, view.}
 
 proc submitProof*(marketplace: Marketplace, id: SlotId, proof: Groth16Proof): ?TransactionResponse {.contract.}
 proc markProofAsMissing*(marketplace: Marketplace, id: SlotId, period: UInt256): ?TransactionResponse {.contract.}
+
+proc reserveSlot*(marketplace: Marketplace, requestId: RequestId, slotIndex: UInt256): ?TransactionResponse {.contract.}
+proc canReserveSlot*(marketplace: Marketplace, requestId: RequestId, slotIndex: UInt256): bool {.contract, view.}
diff --git a/codex/market.nim b/codex/market.nim
index 245c28d5..89e6231a 100644
--- a/codex/market.nim
+++ b/codex/market.nim
@@ -161,6 +161,20 @@ method canProofBeMarkedAsMissing*(market: Market,
                                   period: Period): Future[bool] {.base, async.} =
   raiseAssert("not implemented")
 
+method reserveSlot*(
+  market: Market,
+  requestId: RequestId,
+  slotIndex: UInt256) {.base, async.} =
+
+  raiseAssert("not implemented")
+
+method canReserveSlot*(
+  market: Market,
+  requestId: RequestId,
+  slotIndex: UInt256): Future[bool] {.base, async.} =
+
+  raiseAssert("not implemented")
+
 method subscribeFulfillment*(market: Market,
                              callback: OnFulfillment):
                             Future[Subscription] {.base, async.} =
diff --git a/vendor/codex-contracts-eth b/vendor/codex-contracts-eth
index 558bf645..33010bd2 160000
--- a/vendor/codex-contracts-eth
+++ b/vendor/codex-contracts-eth
@@ -1 +1 @@
-Subproject commit 558bf645c3dc385437a3e695bba57e7dba1375fb
+Subproject commit 33010bd20cfdc3d589be25782052796af580ca83