diff --git a/backend/src/graphql/models/Decay.ts b/backend/src/graphql/models/Decay.ts
index 17ee8fbac..860580e8f 100644
--- a/backend/src/graphql/models/Decay.ts
+++ b/backend/src/graphql/models/Decay.ts
@@ -15,13 +15,6 @@ export class Decay {
     }
   }
 
-  static async getDecayStartBlock(): Promise<Transaction | undefined> {
-    if (!this.decayStartBlockTransaction) {
-      this.decayStartBlockTransaction = await Transaction.getDecayStartBlock()
-    }
-    return this.decayStartBlockTransaction
-  }
-
   @Field(() => Number)
   balance: number
 
@@ -38,6 +31,4 @@ export class Decay {
 
   @Field(() => Int, { nullable: true })
   decayStartBlock?: string
-
-  static decayStartBlockTransaction: Transaction | undefined
 }
diff --git a/backend/src/util/decay.ts b/backend/src/util/decay.ts
index ea5f6dafe..9da1d3909 100644
--- a/backend/src/util/decay.ts
+++ b/backend/src/util/decay.ts
@@ -1,4 +1,6 @@
+import { getCustomRepository } from 'typeorm'
 import { Decay } from '../graphql/models/Decay'
+import { TransactionRepository } from '../typeorm/repository/Transaction'
 
 function decayFormula(amount: number, durationInSeconds: number): number {
   return amount * Math.pow(0.99999997802044727, durationInSeconds)
@@ -6,7 +8,8 @@ function decayFormula(amount: number, durationInSeconds: number): number {
 
 async function calculateDecay(amount: number, from: Date, to: Date): Promise<number> {
   // load decay start block
-  const decayStartBlock = await Decay.getDecayStartBlock()
+  const transactionRepository = getCustomRepository(TransactionRepository)
+  const decayStartBlock = await transactionRepository.findDecayStartBlock()
 
   // if decay hasn't started yet we return input amount
   if (!decayStartBlock) return amount
@@ -22,7 +25,8 @@ async function calculateDecayWithInterval(
   from: number | Date,
   to: number | Date,
 ): Promise<Decay> {
-  const decayStartBlock = await Decay.getDecayStartBlock()
+  const transactionRepository = getCustomRepository(TransactionRepository)
+  const decayStartBlock = await transactionRepository.findDecayStartBlock()
 
   const result = new Decay(undefined)
   result.balance = amount