diff --git a/packages/engine/paima-funnel/src/cde/cardanoPool.ts b/packages/engine/paima-funnel/src/cde/cardanoPool.ts
index 36f476783..0197dffa4 100644
--- a/packages/engine/paima-funnel/src/cde/cardanoPool.ts
+++ b/packages/engine/paima-funnel/src/cde/cardanoPool.ts
@@ -6,14 +6,14 @@ import type {
 import { ChainDataExtensionDatumType, DEFAULT_FUNNEL_TIMEOUT, timeout } from '@paima/utils';
 import { Routes, query } from '@dcspark/carp-client/client/src';
 import type { DelegationForPoolResponse } from '@dcspark/carp-client/shared/models/DelegationForPool';
-import { absoluteSlotToEpoch } from '../funnels/carp/funnel.js';
 
 export default async function getCdeData(
   url: string,
   extension: ChainDataExtensionCardanoDelegation,
   fromAbsoluteSlot: number,
   toAbsoluteSlot: number,
-  getBlockNumber: (slot: number) => number
+  getBlockNumber: (slot: number) => number,
+  absoluteSlotToEpoch: (slot: number) => number
 ): Promise<ChainDataExtensionDatum[]> {
   const events = await timeout(
     query(url, Routes.delegationForPool, {
diff --git a/packages/engine/paima-funnel/src/funnels/carp/funnel.ts b/packages/engine/paima-funnel/src/funnels/carp/funnel.ts
index 37487ecc5..494e87aaf 100644
--- a/packages/engine/paima-funnel/src/funnels/carp/funnel.ts
+++ b/packages/engine/paima-funnel/src/funnels/carp/funnel.ts
@@ -29,36 +29,42 @@ import { getCardanoEpoch } from '@paima/db';
 
 const delayForWaitingForFinalityLoop = 1000;
 
-// This returns the unix timestamp of the first block in the Shelley era of the
-// configured network, and the slot of the corresponding block.
-function knownShelleyTime(): { timestamp: number; absoluteSlot: number } {
+type Era = {
+  firstSlot: number;
+  startEpoch: number;
+  slotsPerEpoch: number;
+  timestamp: number;
+};
+
+function shelleyEra(): Era {
   switch (ENV.CARDANO_NETWORK) {
     case 'preview':
-      return { timestamp: 1666656000, absoluteSlot: 0 };
+      return {
+        firstSlot: 0,
+        startEpoch: 0,
+        slotsPerEpoch: 86400,
+        timestamp: 1666656000,
+      };
     case 'preprod':
-      return { timestamp: 1655769600, absoluteSlot: 86400 };
+      return {
+        firstSlot: 86400,
+        startEpoch: 4,
+        slotsPerEpoch: 432000,
+        timestamp: 1655769600,
+      };
     case 'mainnet':
-      return { timestamp: 1596059091, absoluteSlot: 4492800 };
+      return {
+        firstSlot: 4492800,
+        startEpoch: 208,
+        slotsPerEpoch: 432000,
+        timestamp: 1596059091,
+      };
     default:
       throw new Error('unknown cardano network');
   }
 }
 
-function shelleyEra(): { firstSlot: number; startEpoch: number; slotsPerEpoch: number } {
-  switch (ENV.CARDANO_NETWORK) {
-    case 'preview':
-      return { firstSlot: 0, startEpoch: 0, slotsPerEpoch: 86400 };
-    case 'preprod':
-      return { firstSlot: 86400, startEpoch: 4, slotsPerEpoch: 432000 };
-    case 'mainnet':
-      return { firstSlot: 4492800, startEpoch: 208, slotsPerEpoch: 432000 };
-    default:
-      throw new Error('unknown cardano network');
-  }
-}
-
-export function absoluteSlotToEpoch(slot: number): number {
-  const era = shelleyEra();
+function absoluteSlotToEpoch(era: Era, slot: number): number {
   const slotRelativeToEra = slot - era.firstSlot;
 
   if (slotRelativeToEra >= 0) {
@@ -86,14 +92,12 @@ Note: The state pairing only matters after the presync stage is done, so as
 long as the timestamp of the block specified in START_BLOCKHEIGHT happens after
 the first Shelley block, we don't need to consider the previous Cardano era (if any).
 */
-function timestampToAbsoluteSlot(timestamp: number, confirmationDepth: number): number {
+function timestampToAbsoluteSlot(era: Era, timestamp: number, confirmationDepth: number): number {
   const cardanoAvgBlockPeriod = 20;
   // map timestamps with a delta, since we are waiting for blocks.
   const confirmationTimeDelta = cardanoAvgBlockPeriod * confirmationDepth;
 
-  const era = knownShelleyTime();
-
-  return timestamp - confirmationTimeDelta - era.timestamp + era.absoluteSlot;
+  return timestamp - confirmationTimeDelta - era.timestamp + era.firstSlot;
 }
 
 export class CarpFunnel extends BaseFunnel implements ChainFunnel {
@@ -111,9 +115,11 @@ export class CarpFunnel extends BaseFunnel implements ChainFunnel {
     this.readPresyncData.bind(this);
     this.getDbTx.bind(this);
     this.bufferedData = null;
+    this.era = shelleyEra();
   }
 
   private bufferedData: ChainData[] | null;
+  private era: Era;
 
   public override async readData(blockHeight: number): Promise<ChainData[]> {
     if (!this.bufferedData || this.bufferedData[0].blockNumber != blockHeight) {
@@ -150,7 +156,8 @@ export class CarpFunnel extends BaseFunnel implements ChainFunnel {
       this.sharedData.extensions,
       lastTimestamp,
       this.cache,
-      this.confirmationDepth
+      this.confirmationDepth,
+      this.era
     );
 
     const composed = composeChainData(this.bufferedData, grouped);
@@ -160,7 +167,8 @@ export class CarpFunnel extends BaseFunnel implements ChainFunnel {
         data.internalEvents = [] as InternalEvent[];
 
         const epoch = absoluteSlotToEpoch(
-          timestampToAbsoluteSlot(data.timestamp, this.confirmationDepth)
+          this.era,
+          timestampToAbsoluteSlot(this.era, data.timestamp, this.confirmationDepth)
         );
 
         const prevEpoch = this.cache.getState().epoch;
@@ -201,7 +209,8 @@ export class CarpFunnel extends BaseFunnel implements ChainFunnel {
                 Math.min(arg.to, this.cache.getState().startingSlot - 1),
                 slot => {
                   return slot;
-                }
+                },
+                slot => absoluteSlotToEpoch(this.era, slot)
               );
               return data;
             })
@@ -249,6 +258,7 @@ export class CarpFunnel extends BaseFunnel implements ChainFunnel {
 
       newEntry.updateStartingSlot(
         timestampToAbsoluteSlot(
+          shelleyEra(),
           (await sharedData.web3.eth.getBlock(startingBlockHeight)).timestamp as number,
           confirmationDepth
         )
@@ -280,14 +290,15 @@ async function readDataInternal(
   extensions: ChainDataExtension[],
   lastTimestamp: number,
   cache: CarpFunnelCacheEntry,
-  confirmationDepth: number
+  confirmationDepth: number,
+  era: Era
 ): Promise<PresyncChainData[]> {
   // the lower range is exclusive
-  const min = timestampToAbsoluteSlot(lastTimestamp, confirmationDepth);
+  const min = timestampToAbsoluteSlot(era, lastTimestamp, confirmationDepth);
   // the upper range is inclusive
   const maxElement = data[data.length - 1];
 
-  const max = timestampToAbsoluteSlot(maxElement.timestamp, confirmationDepth);
+  const max = timestampToAbsoluteSlot(era, maxElement.timestamp, confirmationDepth);
 
   cache.updateLastPoint(maxElement.blockNumber, maxElement.timestamp);
 
@@ -312,7 +323,7 @@ async function readDataInternal(
 
   const blockNumbers = data.reduce(
     (dict, data) => {
-      dict[timestampToAbsoluteSlot(data.timestamp, confirmationDepth)] = data.blockNumber;
+      dict[timestampToAbsoluteSlot(era, data.timestamp, confirmationDepth)] = data.blockNumber;
       return dict;
     },
     {} as { [slot: number]: number }
@@ -343,7 +354,8 @@ async function readDataInternal(
             extension,
             min,
             Math.min(max, extension.stopSlot || max),
-            mapSlotToBlockNumber
+            mapSlotToBlockNumber,
+            slot => absoluteSlotToEpoch(era, slot)
           );
 
           return data;