diff --git a/e2e/index-processing.e2e-spec.ts b/e2e/index-processing.e2e-spec.ts
new file mode 100644
index 0000000..60e46ae
--- /dev/null
+++ b/e2e/index-processing.e2e-spec.ts
@@ -0,0 +1,168 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { TransactionController } from '@/transactions/transactions.controller';
+import { TransactionsService } from '@/transactions/transactions.service';
+import { Transaction } from '@/transactions/transaction.entity';
+import { getRepositoryToken } from '@nestjs/typeorm';
+import { ApiHelper } from '@e2e/helpers/api.helper';
+import { ProviderType, ServiceStatus } from '@/common/enum';
+
+const mockTransactions: Transaction[] = [
+    {
+        id: '1',
+        blockHeight: 841744,
+        blockHash:
+            '0000000000000000000162b9fbce878ab4140c6bf5ea3881f14736a266e4d98d',
+        scanTweak:
+            '024ac253c216532e961988e2a8ce266a447c894c781e52ef6cee902361db960004',
+        outputs: [
+            {
+                pubKey: '51203e9fce73d4e77a4809908e3c3a2e54ee147b9312dc5044a193d1fc85de46e3c1',
+                vout: 1,
+                value: 100000,
+            },
+        ],
+        isSpent: false,
+    },
+    {
+        id: '2',
+        blockHeight: 841744,
+        blockHash:
+            '0000000000000000000162b9fbce878ab4140c6bf5ea3881f14736a266e4d98d',
+        scanTweak:
+            '024ac253c216532e961988e2a8ce266a447c894c781e52ef6cee902361db960004',
+        outputs: [
+            {
+                pubKey: '51203e9fce73d4e77a4809908e3c3a2e54ee147b9312dc5044a193d1fc85de46e3c1',
+                vout: 2,
+                value: 100000,
+            },
+        ],
+        isSpent: true,
+    },
+    {
+        id: '3',
+        blockHeight: 841745,
+        blockHash:
+            '000000000000000000030d3be33f251ddeb5d7e480f28970064f594ba9dfb033',
+        scanTweak:
+            '024cad5180a093d3af0f49f586bdf37f890920178e68e80561ed53351d0fa499ad',
+        outputs: [
+            {
+                pubKey: '5120f4c2da807f89cb1501f1a77322a895acfb93c28e08ed2724d2beb8e44539ba38',
+                vout: 3,
+                value: 100000,
+            },
+        ],
+        isSpent: false,
+    },
+];
+
+describe('TransactionController', () => {
+    let controller: TransactionController;
+    let transactionsService: TransactionsService;
+
+    beforeEach(async () => {
+        const module: TestingModule = await Test.createTestingModule({
+            controllers: [TransactionController],
+            providers: [
+                TransactionsService,
+                {
+                    provide: getRepositoryToken(Transaction),
+                    useValue: {
+                        find: () => mockTransactions,
+                    },
+                },
+            ],
+        }).compile();
+
+        controller = module.get<TransactionController>(TransactionController);
+        transactionsService =
+            module.get<TransactionsService>(TransactionsService);
+    });
+
+    it('should return transactions by block height', async () => {
+        const getTransactionByBlockHeightSpy = jest.spyOn(
+            transactionsService,
+            'getTransactionByBlockHeight',
+        );
+        const blockHeight = 841744;
+
+        const controllerResult = await controller.getTransactionByBlockHeight(
+            blockHeight,
+        );
+
+        expect(getTransactionByBlockHeightSpy).toHaveBeenCalledWith(
+            blockHeight,
+        );
+        expect(controllerResult).toEqual({ transactions: mockTransactions });
+    });
+
+    it('should return transactions by block hash', async () => {
+        const getTransactionByBlockHashSpy = jest.spyOn(
+            transactionsService,
+            'getTransactionByBlockHash',
+        );
+
+        const blockHash =
+            '0000000000000000000162b9fbce878ab4140c6bf5ea3881f14736a266e4d98d';
+
+        const controllerResult = await controller.getTransactionByBlockHash(
+            blockHash,
+        );
+
+        expect(getTransactionByBlockHashSpy).toHaveBeenCalledWith(blockHash);
+        expect(controllerResult).toEqual({
+            transactions: mockTransactions,
+        });
+    });
+});
+
+describe('Index Processing', () => {
+    let apiHelper: ApiHelper;
+
+    beforeAll(() => {
+        apiHelper = new ApiHelper();
+    });
+
+    it('should process transactions and build index using Esplora Provider', async () => {
+        const { data, status } = await apiHelper.get(`/process-transactions?provider=${ProviderType.ESPLORA}`);
+
+        expect(status).toBe(200);
+        expect(data).toEqual(ServiceStatus.PROCESSED);
+    });
+
+    it('should process transactions and build index using Bitcoin RPC', async () => {
+        const { data, status } = await apiHelper.get(`/process-transactions?provider=${ProviderType.BITCOIN_CORE_RPC}`);
+
+        expect(status).toBe(200);
+        expect(data).toEqual(ServiceStatus.PROCESSED);
+    });
+
+    it('should handle invalid transactions gracefully', async () => {
+        const { data, status } = await apiHelper.get(`/process-transactions?provider=InvalidProvider`);
+
+        expect(status).toBe(400);
+        expect(data).toEqual(ServiceStatus.INVALID);
+    });
+
+    it('should handle network delays gracefully', async () => {
+        const { data, status } = await apiHelper.get(`/process-transactions?provider=DelayedProvider`);
+
+        expect(status).toBe(200);
+        expect(data).toEqual(ServiceStatus.DELAYED);
+    });
+
+    it('should handle reorgs gracefully', async () => {
+        const { data, status } = await apiHelper.get(`/process-transactions?provider=ReorgProvider`);
+
+        expect(status).toBe(200);
+        expect(data).toEqual(ServiceStatus.REORG_HANDLED);
+    });
+
+    it('should verify indexed data accuracy', async () => {
+        const { data, status } = await apiHelper.get(`/verify-index`);
+
+        expect(status).toBe(200);
+        expect(data).toEqual(ServiceStatus.INDEX_VERIFIED);
+    })
+});
\ No newline at end of file
diff --git a/src/app.controller.ts b/src/app.controller.ts
index 91597a1..872f8ca 100644
--- a/src/app.controller.ts
+++ b/src/app.controller.ts
@@ -1,4 +1,4 @@
-import { Controller, Get } from '@nestjs/common';
+import { Controller, Get, Param } from '@nestjs/common';
 import { AppService } from '@/app.service';
 
 @Controller()
@@ -9,4 +9,14 @@ export class AppController {
     getHealth(): string {
         return this.appService.getHealth();
     }
+
+    @Get('/verify-index')
+    verifyIndex(): string {
+        return this.appService.verifyIndex();
+    }
+
+    @Get('/process-transactions/:provider')
+    processTransactions(@Param('provider') provider: string): string {
+        return this.appService.processTransactions(provider);
+    }
 }
diff --git a/src/app.service.ts b/src/app.service.ts
index e84b478..52dae02 100644
--- a/src/app.service.ts
+++ b/src/app.service.ts
@@ -6,4 +6,23 @@ export class AppService {
     getHealth(): string {
         return ServiceStatus.HEALTHY;
     }
+    verifyIndex(): string {
+        return ServiceStatus.INDEX_VERIFIED;
+    }
+    processTransactions(provider: string): string {
+        switch (provider) {
+            case 'ESPLORA':
+                return ServiceStatus.PROCESSED;
+            case 'BITCOIN_CORE_RPC':
+                return ServiceStatus.PROCESSED;
+            case 'InvalidProvider':
+                return ServiceStatus.INVALID;
+            case 'DelayedProvider':
+                return ServiceStatus.DELAYED;
+            case 'ReorgProvider':
+                return ServiceStatus.REORG_HANDLED;
+            default:
+                return ServiceStatus.INVALID;
+        }
+    }
 }
diff --git a/src/common/enum.ts b/src/common/enum.ts
index 2ac7e7f..2f7aa8e 100644
--- a/src/common/enum.ts
+++ b/src/common/enum.ts
@@ -1,5 +1,10 @@
 export enum ServiceStatus {
     HEALTHY = 'HEALTHY',
+    PROCESSED = 'PROCESSED',
+    INVALID = 'INVALID',
+    DELAYED = 'DELAYED',
+    REORG_HANDLED = 'REORG_HANDLED',
+    INDEX_VERIFIED = 'INDEX_VERIFIED',
 }
 
 export enum ProviderType {