diff --git a/java/google/registry/flows/domain/BaseDomainCreateFlow.java b/java/google/registry/flows/domain/BaseDomainCreateFlow.java
index 5df93bee7..57a87f2d4 100644
--- a/java/google/registry/flows/domain/BaseDomainCreateFlow.java
+++ b/java/google/registry/flows/domain/BaseDomainCreateFlow.java
@@ -176,7 +176,8 @@ public abstract class BaseDomainCreateFlow<R extends DomainBase, B extends Build
     tldState = registry.getTldState(now);
     checkRegistryStateForTld(tld);
     domainLabel = domainName.parts().get(0);
-    createCost = registry.getDomainCreateCost(targetId, command.getPeriod().getValue());
+    createCost =
+        registry.getDomainCreateCost(targetId, now, getClientId(), command.getPeriod().getValue());
     // The TLD should always be the parent of the requested domain name.
     isAnchorTenantViaReservation = matchesAnchorTenantReservation(
         domainLabel, tld, command.getAuthInfo().getPw().getValue());
@@ -201,7 +202,7 @@ public abstract class BaseDomainCreateFlow<R extends DomainBase, B extends Build
       } else if (isClaimsCreate) {
         throw new ClaimsPeriodEndedException(tld);
       }
-      verifyPremiumNameIsNotBlocked(targetId, tld, getClientId());
+      verifyPremiumNameIsNotBlocked(targetId, now, getClientId(), tld);
     }
     verifyUnitIsYears(command.getPeriod());
     verifyNotInPendingDelete(
diff --git a/java/google/registry/flows/domain/DomainAllocateFlow.java b/java/google/registry/flows/domain/DomainAllocateFlow.java
index d08ad0033..8efc3ab55 100644
--- a/java/google/registry/flows/domain/DomainAllocateFlow.java
+++ b/java/google/registry/flows/domain/DomainAllocateFlow.java
@@ -103,7 +103,8 @@ public class DomainAllocateFlow extends DomainCreateOrAllocateFlow {
         .setFlags(billingFlagsBuilder.add(Flag.ALLOCATION).build())
         .setTargetId(targetId)
         .setClientId(getClientId())
-        .setCost(registry.getDomainCreateCost(targetId, command.getPeriod().getValue()))
+        .setCost(registry
+            .getDomainCreateCost(targetId, now, getClientId(), command.getPeriod().getValue()))
         .setPeriodYears(command.getPeriod().getValue())
         .setEventTime(now)
         // If there are no nameservers on the domain, then they get the benefit of the sunrush add
diff --git a/java/google/registry/flows/domain/DomainApplicationCreateFlow.java b/java/google/registry/flows/domain/DomainApplicationCreateFlow.java
index 7f6d22d8e..7099b8b05 100644
--- a/java/google/registry/flows/domain/DomainApplicationCreateFlow.java
+++ b/java/google/registry/flows/domain/DomainApplicationCreateFlow.java
@@ -139,7 +139,7 @@ public class DomainApplicationCreateFlow extends BaseDomainCreateFlow<DomainAppl
 
   @Override
   protected void verifyDomainCreateIsAllowed() throws EppException {
-    validateFeeChallenge(targetId, getTld(), feeCreate, createCost);
+    validateFeeChallenge(targetId, getTld(), now, getClientId(), feeCreate, createCost);
     if (tldState == TldState.LANDRUSH && !superuser) {
       // Prohibit creating a landrush application in LANDRUSH (but not in SUNRUSH) if there is
       // exactly one sunrise application for the same name.
diff --git a/java/google/registry/flows/domain/DomainCheckFlow.java b/java/google/registry/flows/domain/DomainCheckFlow.java
index 3fcefd8b0..5279331eb 100644
--- a/java/google/registry/flows/domain/DomainCheckFlow.java
+++ b/java/google/registry/flows/domain/DomainCheckFlow.java
@@ -77,7 +77,7 @@ public class DomainCheckFlow extends BaseDomainCheckFlow {
     ReservationType reservationType = getReservationType(domainName);
     Registry registry = Registry.get(domainName.parent().toString());
     if (reservationType == UNRESERVED
-        && registry.isPremiumName(domainName)
+        && registry.isPremiumName(domainName, now, getClientId())
         && registry.getPremiumPriceAckRequired()
         && !nullToEmpty(sessionMetadata.getServiceExtensionUris()).contains(
             ServiceExtension.FEE_0_6.getUri())) {
@@ -114,7 +114,8 @@ public class DomainCheckFlow extends BaseDomainCheckFlow {
         throw new OnlyCheckedNamesCanBeFeeCheckedException();
       }
       FeeCheck.Builder builder = new FeeCheck.Builder();
-      handleFeeRequest(domainCheck, builder, domainName, getTldFromSld(domainName), now);
+      handleFeeRequest(
+          domainCheck, builder, domainName, getTldFromSld(domainName), getClientId(), now);
       feeChecksBuilder.add(builder.setName(domainName).build());
     }
     return ImmutableList.of(FeeCheckResponseExtension.create(feeChecksBuilder.build()));
diff --git a/java/google/registry/flows/domain/DomainCreateFlow.java b/java/google/registry/flows/domain/DomainCreateFlow.java
index b59dd6b6f..eaa5c01b9 100644
--- a/java/google/registry/flows/domain/DomainCreateFlow.java
+++ b/java/google/registry/flows/domain/DomainCreateFlow.java
@@ -105,7 +105,7 @@ public class DomainCreateFlow extends DomainCreateOrAllocateFlow {
   @Override
   protected final void verifyDomainCreateIsAllowed() throws EppException {
     String tld = getTld();
-    validateFeeChallenge(targetId, tld, feeCreate, createCost);
+    validateFeeChallenge(targetId, tld, now, getClientId(), feeCreate, createCost);
     if (!superuser) {
       // Prohibit creating a domain if there is an open application for the same name.
       for (DomainApplication application : loadActiveApplicationsByDomainName(targetId, now)) {
diff --git a/java/google/registry/flows/domain/DomainDeleteFlow.java b/java/google/registry/flows/domain/DomainDeleteFlow.java
index 24cc860b0..a91bfedae 100644
--- a/java/google/registry/flows/domain/DomainDeleteFlow.java
+++ b/java/google/registry/flows/domain/DomainDeleteFlow.java
@@ -140,7 +140,7 @@ public class DomainDeleteFlow extends ResourceSyncDeleteFlow<DomainResource, Bui
               checkNotNull(gracePeriod.getRecurringBillingEvent()).get().getRecurrenceTimeOfYear();
           DateTime autoRenewTime = recurrenceTimeOfYear.getLastInstanceBeforeOrAt(now);
           cost = Registry.get(existingResource.getTld())
-              .getDomainRenewCost(targetId, 1, autoRenewTime);
+              .getDomainRenewCost(targetId, autoRenewTime, getClientId(), 1);
         } else {
           cost = checkNotNull(gracePeriod.getOneTimeBillingEvent()).get().getCost();
         }
diff --git a/java/google/registry/flows/domain/DomainFlowUtils.java b/java/google/registry/flows/domain/DomainFlowUtils.java
index 413c0d6ec..cd9ff00b7 100644
--- a/java/google/registry/flows/domain/DomainFlowUtils.java
+++ b/java/google/registry/flows/domain/DomainFlowUtils.java
@@ -384,9 +384,9 @@ public class DomainFlowUtils {
    * where it would not be allowed is if domain name is premium, and premium names are blocked by
    * this registrar.
    */
-  static void verifyPremiumNameIsNotBlocked(String domainName, String tld, String clientId)
-      throws EppException {
-    if (Registry.get(tld).isPremiumName(domainName)) {
+  static void verifyPremiumNameIsNotBlocked(
+      String domainName, DateTime priceTime, String clientId, String tld) throws EppException {
+    if (Registry.get(tld).isPremiumName(domainName, priceTime, clientId)) {
       // NB: The load of the Registar object is transactionless, which means that it should hit
       // memcache most of the time.
       if (Registrar.loadByClientId(clientId).getBlockPremiumNames()) {
@@ -561,6 +561,7 @@ public class DomainFlowUtils {
       BaseFeeResponse.Builder<?, ?> builder,
       String domainName,
       String tld,
+      String clientIdentifier,
       DateTime now) throws EppException {
     InternetDomainName domain = InternetDomainName.from(domainName);
     FeeCommandDescriptor feeCommand = feeRequest.getCommand();
@@ -584,7 +585,7 @@ public class DomainFlowUtils {
         .setPeriod(feeRequest.getPeriod())
         // Choose from four classes: premium, premium-collision, collision, or null (standard case).
         .setClass(emptyToNull(Joiner.on('-').skipNulls().join(
-            registry.isPremiumName(domainName) ? "premium" : null,
+            registry.isPremiumName(domainName, now, clientIdentifier) ? "premium" : null,
             isNameCollisionInSunrise ? "collision" : null)));
 
     switch (feeCommand.getCommand()) {
@@ -595,7 +596,11 @@ public class DomainFlowUtils {
           builder.setClass("reserved");  // Override whatever class we've set above.
         } else {
           builder.setFee(
-              Fee.create(registry.getDomainCreateCost(domainName, years).getAmount(), "create"));
+              Fee.create(
+                  registry
+                      .getDomainCreateCost(domainName, now, clientIdentifier, years)
+                      .getAmount(),
+                  "create"));
         }
         break;
       case RESTORE:
@@ -604,23 +609,32 @@ public class DomainFlowUtils {
         }
         // Restores have a "renew" and a "restore" fee.
         builder.setFee(
-            Fee.create(registry.getDomainRenewCost(domainName, years, now).getAmount(), "renew"),
+            Fee.create(
+                registry.getDomainRenewCost(domainName, now, clientIdentifier, years).getAmount(),
+                "renew"),
             Fee.create(registry.getStandardRestoreCost().getAmount(), "restore"));
         break;
       default:
         // Anything else (transfer|renew) will have a "renew" fee.
         builder.setFee(
-            Fee.create(registry.getDomainRenewCost(domainName, years, now).getAmount(), "renew"));
+            Fee.create(
+                registry.getDomainRenewCost(domainName, now, clientIdentifier, years).getAmount(),
+                "renew"));
     }
   }
 
   static void validateFeeChallenge(
-      String domainName, String tld,
+      String domainName,
+      String tld,
+      DateTime priceTime,
+      String clientIdentifier,
       final BaseFeeCommand feeCommand,
-      Money cost, Money... otherCosts) throws EppException {
+      Money cost,
+      Money... otherCosts)
+      throws EppException {
     Registry registry = Registry.get(tld);
     if (registry.getPremiumPriceAckRequired()
-        && registry.isPremiumName(domainName)
+        && registry.isPremiumName(domainName, priceTime, clientIdentifier)
         && feeCommand == null) {
       throw new FeesRequiredForPremiumNameException();
     }
diff --git a/java/google/registry/flows/domain/DomainInfoFlow.java b/java/google/registry/flows/domain/DomainInfoFlow.java
index bc3b52ca1..189946bb1 100644
--- a/java/google/registry/flows/domain/DomainInfoFlow.java
+++ b/java/google/registry/flows/domain/DomainInfoFlow.java
@@ -87,7 +87,8 @@ public class DomainInfoFlow extends BaseDomainInfoFlow<DomainResource, Builder>
     FeeInfoExtension feeInfo = eppInput.getSingleExtension(FeeInfoExtension.class);
     if (feeInfo != null) {  // Fee check was requested.
       FeeInfoResponseExtension.Builder builder = new FeeInfoResponseExtension.Builder();
-      handleFeeRequest(feeInfo, builder, getTargetId(), existingResource.getTld(), now);
+      handleFeeRequest(
+          feeInfo, builder, getTargetId(), existingResource.getTld(), getClientId(), now);
       extensions.add(builder.build());
     }
     return extensions.build();
diff --git a/java/google/registry/flows/domain/DomainRenewFlow.java b/java/google/registry/flows/domain/DomainRenewFlow.java
index 8b397ad32..467611095 100644
--- a/java/google/registry/flows/domain/DomainRenewFlow.java
+++ b/java/google/registry/flows/domain/DomainRenewFlow.java
@@ -110,8 +110,9 @@ public class DomainRenewFlow extends OwnedResourceMutateFlow<DomainResource, Ren
       throw new IncorrectCurrentExpirationDateException();
     }
     renewCost = Registry.get(existingResource.getTld())
-        .getDomainRenewCost(targetId, command.getPeriod().getValue(), now);
-    validateFeeChallenge(targetId, existingResource.getTld(), feeRenew, renewCost);
+        .getDomainRenewCost(targetId, now, getClientId(), command.getPeriod().getValue());
+    validateFeeChallenge(
+        targetId, existingResource.getTld(), now, getClientId(), feeRenew, renewCost);
   }
 
   @Override
diff --git a/java/google/registry/flows/domain/DomainRestoreRequestFlow.java b/java/google/registry/flows/domain/DomainRestoreRequestFlow.java
index 57cf5ff9e..64b1772cc 100644
--- a/java/google/registry/flows/domain/DomainRestoreRequestFlow.java
+++ b/java/google/registry/flows/domain/DomainRestoreRequestFlow.java
@@ -98,12 +98,12 @@ public class DomainRestoreRequestFlow extends OwnedResourceMutateFlow<DomainReso
     checkAllowedAccessToTld(getAllowedTlds(), tld);
     if (!superuser) {
       verifyNotReserved(InternetDomainName.from(targetId), false);
-      verifyPremiumNameIsNotBlocked(targetId, tld, getClientId());
+      verifyPremiumNameIsNotBlocked(targetId, now, getClientId(), tld);
     }
     feeUpdate = eppInput.getSingleExtension(FeeUpdateExtension.class);
     restoreCost = Registry.get(tld).getStandardRestoreCost();
-    renewCost = Registry.get(tld).getDomainRenewCost(targetId, 1, now);
-    validateFeeChallenge(targetId, tld, feeUpdate, restoreCost, renewCost);
+    renewCost = Registry.get(tld).getDomainRenewCost(targetId, now, getClientId(), 1);
+    validateFeeChallenge(targetId, tld, now, getClientId(), feeUpdate, restoreCost, renewCost);
   }
 
   @Override
diff --git a/java/google/registry/flows/domain/DomainTransferApproveFlow.java b/java/google/registry/flows/domain/DomainTransferApproveFlow.java
index c80044ae1..29a87e323 100644
--- a/java/google/registry/flows/domain/DomainTransferApproveFlow.java
+++ b/java/google/registry/flows/domain/DomainTransferApproveFlow.java
@@ -78,8 +78,9 @@ public class DomainTransferApproveFlow extends
         .setPeriodYears(extraYears)
         .setCost(Registry.get(tld).getDomainRenewCost(
             targetId,
-            extraYears,
-            transferData.getTransferRequestTime()))
+            transferData.getTransferRequestTime(),
+            getClientId(),
+            extraYears))
         .setEventTime(now)
         .setBillingTime(now.plus(Registry.get(tld).getTransferGracePeriodLength()))
         .setParent(historyEntry)
diff --git a/java/google/registry/flows/domain/DomainTransferRequestFlow.java b/java/google/registry/flows/domain/DomainTransferRequestFlow.java
index 173785888..db05e13eb 100644
--- a/java/google/registry/flows/domain/DomainTransferRequestFlow.java
+++ b/java/google/registry/flows/domain/DomainTransferRequestFlow.java
@@ -113,7 +113,8 @@ public class DomainTransferRequestFlow
     }
     Registry registry = Registry.get(existingResource.getTld());
     automaticTransferTime = now.plus(registry.getAutomaticTransferLength());
-    renewCost = registry.getDomainRenewCost(targetId, command.getPeriod().getValue(), now);
+    renewCost = registry
+        .getDomainRenewCost(targetId, now, getClientId(), command.getPeriod().getValue());
     transferBillingEvent = new BillingEvent.OneTime.Builder()
         .setReason(Reason.TRANSFER)
         .setTargetId(targetId)
@@ -151,9 +152,10 @@ public class DomainTransferRequestFlow
   protected final void verifyTransferRequestIsAllowed() throws EppException {
     verifyUnitIsYears(command.getPeriod());
     if (!superuser) {
-      verifyPremiumNameIsNotBlocked(targetId, existingResource.getTld(), getClientId());
+      verifyPremiumNameIsNotBlocked(targetId, now, getClientId(), existingResource.getTld());
     }
-    validateFeeChallenge(targetId, existingResource.getTld(), feeTransfer, renewCost);
+    validateFeeChallenge(
+        targetId, existingResource.getTld(), now, getClientId(), feeTransfer, renewCost);
     checkAllowedAccessToTld(getAllowedTlds(), existingResource.getTld());
   }
 
diff --git a/java/google/registry/model/registry/Registry.java b/java/google/registry/model/registry/Registry.java
index 1fc262c4a..acc662235 100644
--- a/java/google/registry/model/registry/Registry.java
+++ b/java/google/registry/model/registry/Registry.java
@@ -492,26 +492,32 @@ public class Registry extends ImmutableObject implements Buildable {
   }
 
   /** Returns true if the given domain name is on the premium price list. */
-  public boolean isPremiumName(String domainName) {
-    return isPremiumName(InternetDomainName.from(domainName));
+  public boolean isPremiumName(String domainName, DateTime priceTime, String clientIdentifier) {
+    return isPremiumName(InternetDomainName.from(domainName), priceTime, clientIdentifier);
   }
 
   /** Returns true if the given domain name is on the premium price list. */
-  public boolean isPremiumName(InternetDomainName domainName) {
+  @SuppressWarnings("unused")
+  public boolean isPremiumName(
+      InternetDomainName domainName, DateTime priceTime, String clientIdentifier) {
     return getPremiumPriceForSld(domainName).isPresent();
   }
 
   /** Returns the billing cost for registering the specified domain name for this many years. */
-  public Money getDomainCreateCost(String domainName, int years) {
+  @SuppressWarnings("unused")
+  public Money getDomainCreateCost(
+      String domainName, DateTime priceTime, String clientIdentifier, int years) {
     checkArgument(years > 0, "Number of years must be positive");
     Money annualCost = getPremiumPriceForSld(domainName).or(getStandardCreateCost());
     return annualCost.multipliedBy(years);
   }
 
   /** Returns the billing cost for renewing the specified domain name for this many years. */
-  public Money getDomainRenewCost(String domainName, int years, DateTime now) {
+  @SuppressWarnings("unused")
+  public Money getDomainRenewCost(
+      String domainName, DateTime priceTime, String clientIdentifier, int years) {
     checkArgument(years > 0, "Number of years must be positive");
-    Money annualCost = getPremiumPriceForSld(domainName).or(getStandardRenewCost(now));
+    Money annualCost = getPremiumPriceForSld(domainName).or(getStandardRenewCost(priceTime));
     return annualCost.multipliedBy(years);
   }
 
diff --git a/java/google/registry/tools/CreateAnchorTenantCommand.java b/java/google/registry/tools/CreateAnchorTenantCommand.java
index 9d6bc7178..d4944e0b6 100644
--- a/java/google/registry/tools/CreateAnchorTenantCommand.java
+++ b/java/google/registry/tools/CreateAnchorTenantCommand.java
@@ -17,6 +17,7 @@ package google.registry.tools;
 import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Strings.isNullOrEmpty;
 import static google.registry.model.registry.Registries.findTldForNameOrThrow;
+import static org.joda.time.DateTimeZone.UTC;
 
 import com.google.common.net.InternetDomainName;
 import com.google.template.soy.data.SoyMapData;
@@ -29,6 +30,7 @@ import google.registry.tools.Command.GtechCommand;
 import google.registry.tools.soy.CreateAnchorTenantSoyInfo;
 
 import org.joda.money.Money;
+import org.joda.time.DateTime;
 
 import javax.inject.Inject;
 
@@ -86,7 +88,9 @@ final class CreateAnchorTenantCommand extends MutatingEppToolCommand implements
 
     Money cost = null;
     if (fee) {
-      cost = Registry.get(tld).getDomainCreateCost(domainName, DEFAULT_ANCHOR_TENANT_PERIOD_YEARS);
+      cost = Registry.get(tld)
+          .getDomainCreateCost(
+              domainName, DateTime.now(UTC), clientIdentifier, DEFAULT_ANCHOR_TENANT_PERIOD_YEARS);
     }
 
     setSoyTemplate(CreateAnchorTenantSoyInfo.getInstance(),
diff --git a/javatests/google/registry/flows/domain/DomainCreateFlowTest.java b/javatests/google/registry/flows/domain/DomainCreateFlowTest.java
index 7e0c36774..3abb55d67 100644
--- a/javatests/google/registry/flows/domain/DomainCreateFlowTest.java
+++ b/javatests/google/registry/flows/domain/DomainCreateFlowTest.java
@@ -179,9 +179,10 @@ public class DomainCreateFlowTest extends ResourceFlowTestCase<DomainCreateFlow,
         .setReason(Reason.CREATE)
         .setTargetId(getUniqueIdFromCommand())
         .setClientId("TheRegistrar")
-        .setCost(Registry.get(domainTld).isPremiumName(getUniqueIdFromCommand())
-            ? Money.of(USD, 200)
-            : Money.of(USD, 26))
+        .setCost(Registry.get(domainTld)
+            .isPremiumName(getUniqueIdFromCommand(), clock.nowUtc(), "TheRegistrar")
+                ? Money.of(USD, 200)
+                : Money.of(USD, 26))
         .setPeriodYears(2)
         .setEventTime(clock.nowUtc())
         .setBillingTime(billingTime)
diff --git a/javatests/google/registry/flows/domain/DomainTransferFlowTestCase.java b/javatests/google/registry/flows/domain/DomainTransferFlowTestCase.java
index 558238df6..d1c1ef753 100644
--- a/javatests/google/registry/flows/domain/DomainTransferFlowTestCase.java
+++ b/javatests/google/registry/flows/domain/DomainTransferFlowTestCase.java
@@ -185,6 +185,7 @@ public class DomainTransferFlowTestCase<F extends Flow, R extends EppResource>
     return createBillingEventForTransfer(
         domain,
         historyEntry,
+        "NewRegistrar",
         TRANSFER_REQUEST_TIME,
         TRANSFER_EXPIRATION_TIME,
         EXTENDED_REGISTRATION_YEARS);
diff --git a/javatests/google/registry/model/registry/RegistryTest.java b/javatests/google/registry/model/registry/RegistryTest.java
index de0d55b95..55fbd9918 100644
--- a/javatests/google/registry/model/registry/RegistryTest.java
+++ b/javatests/google/registry/model/registry/RegistryTest.java
@@ -311,9 +311,9 @@ public class RegistryTest extends EntityTestCase {
   public void testIsPremiumDomain() throws Exception {
     createTld("example");
     Registry registry = Registry.get("example");
-    assertThat(registry.isPremiumName("poor.example")).isFalse();
-    assertThat(registry.isPremiumName("rich.example")).isTrue();
-    assertThat(registry.isPremiumName("richer.example")).isTrue();
+    assertThat(registry.isPremiumName("poor.example", clock.nowUtc(), "TheRegistrar")).isFalse();
+    assertThat(registry.isPremiumName("rich.example", clock.nowUtc(), "TheRegistrar")).isTrue();
+    assertThat(registry.isPremiumName("richer.example", clock.nowUtc(), "TheRegistrar")).isTrue();
   }
 
   public void testGetDomainCreateCost() throws Exception {
@@ -321,10 +321,14 @@ public class RegistryTest extends EntityTestCase {
     createTld("example");
     Registry registry = Registry.get("example");
     // The default value of 17 is set in createTld().
-    assertThat(registry.getDomainCreateCost("poor.example", 1)).isEqualTo(Money.of(USD, 13));
-    assertThat(registry.getDomainCreateCost("poor.example", 2)).isEqualTo(Money.of(USD, 26));
-    assertThat(registry.getDomainCreateCost("rich.example", 1)).isEqualTo(Money.of(USD, 100));
-    assertThat(registry.getDomainCreateCost("rich.example", 2)).isEqualTo(Money.of(USD, 200));
+    assertThat(registry.getDomainCreateCost("poor.example", clock.nowUtc(), "TheRegistrar", 1))
+        .isEqualTo(Money.of(USD, 13));
+    assertThat(registry.getDomainCreateCost("poor.example", clock.nowUtc(), "TheRegistrar", 2))
+        .isEqualTo(Money.of(USD, 26));
+    assertThat(registry.getDomainCreateCost("rich.example", clock.nowUtc(), "TheRegistrar", 1))
+        .isEqualTo(Money.of(USD, 100));
+    assertThat(registry.getDomainCreateCost("rich.example", clock.nowUtc(), "TheRegistrar", 2))
+        .isEqualTo(Money.of(USD, 200));
   }
 
   @Test
@@ -336,21 +340,21 @@ public class RegistryTest extends EntityTestCase {
             START_OF_TIME, Money.of(USD, 8),
             clock.nowUtc(), Money.of(USD, 10)))
         .build();
-    assertThat(registry.getDomainRenewCost("poor.example", 1, START_OF_TIME))
+    assertThat(registry.getDomainRenewCost("poor.example", START_OF_TIME, "TheRegistrar", 1))
         .isEqualTo(Money.of(USD, 8));
-    assertThat(registry.getDomainRenewCost("poor.example", 2, START_OF_TIME))
+    assertThat(registry.getDomainRenewCost("poor.example", START_OF_TIME, "TheRegistrar", 2))
         .isEqualTo(Money.of(USD, 16));
-    assertThat(registry.getDomainRenewCost("poor.example", 1, clock.nowUtc()))
+    assertThat(registry.getDomainRenewCost("poor.example", clock.nowUtc(), "TheRegistrar", 1))
         .isEqualTo(Money.of(USD, 10));
-    assertThat(registry.getDomainRenewCost("poor.example", 2, clock.nowUtc()))
+    assertThat(registry.getDomainRenewCost("poor.example", clock.nowUtc(), "TheRegistrar", 2))
         .isEqualTo(Money.of(USD, 20));
-    assertThat(registry.getDomainRenewCost("rich.example", 1, START_OF_TIME))
+    assertThat(registry.getDomainRenewCost("rich.example", START_OF_TIME, "TheRegistrar", 1))
         .isEqualTo(Money.of(USD, 100));
-    assertThat(registry.getDomainRenewCost("rich.example", 2, START_OF_TIME))
+    assertThat(registry.getDomainRenewCost("rich.example", START_OF_TIME, "TheRegistrar", 2))
         .isEqualTo(Money.of(USD, 200));
-    assertThat(registry.getDomainRenewCost("rich.example", 1, clock.nowUtc()))
+    assertThat(registry.getDomainRenewCost("rich.example", clock.nowUtc(), "TheRegistrar", 1))
         .isEqualTo(Money.of(USD, 100));
-    assertThat(registry.getDomainRenewCost("rich.example", 2, clock.nowUtc()))
+    assertThat(registry.getDomainRenewCost("rich.example", clock.nowUtc(), "TheRegistrar", 2))
         .isEqualTo(Money.of(USD, 200));
   }
 
@@ -454,39 +458,41 @@ public class RegistryTest extends EntityTestCase {
   @Test
   public void testFailure_isPremiumNameForSldNotUnderTld() {
     thrown.expect(IllegalArgumentException.class);
-    Registry.get("tld").isPremiumName("test.example");
+    Registry.get("tld").isPremiumName("test.example", clock.nowUtc(), "TheRegistrar");
   }
 
   @Test
   public void testFailure_isPremiumNameForSldSubdomain() throws Exception {
     createTld("example");
     thrown.expect(IllegalArgumentException.class);
-    Registry.get("example").isPremiumName("rich.sld.example");
+    Registry.get("example").isPremiumName("rich.sld.example", clock.nowUtc(), "TheRegistrar");
   }
 
   @Test
   public void testFailure_getCreateCostForSldNotUnderTld() {
     thrown.expect(IllegalArgumentException.class);
-    Registry.get("tld").getDomainCreateCost("test.example", 1);
+    Registry.get("tld").getDomainCreateCost("test.example", clock.nowUtc(), "TheRegistrar", 1);
   }
 
   @Test
   public void testFailure_getCreateCostForSldSubdomain() throws Exception {
     createTld("example");
     thrown.expect(IllegalArgumentException.class);
-    Registry.get("example").getDomainCreateCost("rich.sld.example", 1);
+    Registry.get("example")
+        .getDomainCreateCost("rich.sld.example", clock.nowUtc(), "TheRegistrar", 1);
   }
 
   @Test
   public void testFailure_getRenewCostForSldNotUnderTld() {
     thrown.expect(IllegalArgumentException.class);
-    Registry.get("tld").getDomainRenewCost("test.example", 1, clock.nowUtc());
+    Registry.get("tld").getDomainRenewCost("test.example", clock.nowUtc(), "TheRegistrar", 1);
   }
 
   @Test
   public void testFailure_getRenewCostForSldSubdomain() throws Exception {
     createTld("example");
     thrown.expect(IllegalArgumentException.class);
-    Registry.get("example").getDomainRenewCost("rich.sld.example", 1, clock.nowUtc());
+    Registry.get("example")
+        .getDomainRenewCost("rich.sld.example", clock.nowUtc(), "TheRegistrar", 1);
   }
 }
diff --git a/javatests/google/registry/testing/DatastoreHelper.java b/javatests/google/registry/testing/DatastoreHelper.java
index f4735a2c8..e74475376 100644
--- a/javatests/google/registry/testing/DatastoreHelper.java
+++ b/javatests/google/registry/testing/DatastoreHelper.java
@@ -424,6 +424,7 @@ public class DatastoreHelper {
   public static BillingEvent.OneTime createBillingEventForTransfer(
       DomainResource domain,
       HistoryEntry historyEntry,
+      String gainingClientId,
       DateTime costLookupTime,
       DateTime eventTime,
       Integer extendedRegistrationYears) {
@@ -437,8 +438,9 @@ public class DatastoreHelper {
         .setPeriodYears(extendedRegistrationYears)
         .setCost(Registry.get(domain.getTld()).getDomainRenewCost(
             domain.getFullyQualifiedDomainName(),
-            extendedRegistrationYears,
-            costLookupTime))
+            costLookupTime,
+            gainingClientId,
+            extendedRegistrationYears))
         .setParent(historyEntry)
         .build();
   }
@@ -499,6 +501,7 @@ public class DatastoreHelper {
     BillingEvent.OneTime transferBillingEvent = persistResource(createBillingEventForTransfer(
             domain,
             historyEntryDomainTransfer,
+            "NewRegistrar",
             requestTime,
             expirationTime,
             extendedRegistrationYears));