diff --git a/apps/api/src/stats/stats.spec.ts b/apps/api/src/stats/stats.spec.ts
index baf8caa..2dd7f4b 100644
--- a/apps/api/src/stats/stats.spec.ts
+++ b/apps/api/src/stats/stats.spec.ts
@@ -28,13 +28,13 @@ const mockPools = [
 ];
 
 const mockSwaps24h = [
-  { amount0: '1000000', amount1: '-500000' },
-  { amount0: '2000000', amount1: '-1000000' },
+  { amount0: '1000000', amount1: '-500000', feeAmount: '3000' },
+  { amount0: '2000000', amount1: '-1000000', feeAmount: '6000' },
 ];
 
 const mockSwaps7d = [
   ...mockSwaps24h,
-  { amount0: '500000', amount1: '-250000' },
+  { amount0: '500000', amount1: '-250000', feeAmount: '1500' },
 ];
 
 const mockPositions = [{ liquidity: '1000000000' }];
@@ -243,4 +243,32 @@ describe('StatsWorker — volume24h from swap timestamps', () => {
       }),
     );
   });
+
+  it('computes feeApr from actual swap feeAmount fields (not feeTier * volume)', () => {
+    // fees24h = (3000 + 6000) * priceA(1) = 9000
+    // tvl = liquidity(1000000000) * (priceA+priceB)/2 = 1000000000
+    // feeApr = (9000 / 1000000000) * 365 * 100 ≈ 0.3285
+    const updateCall = mockPoolUpdate.mock.calls[0][0];
+    const feeApr = Number(updateCall.data.feeApr);
+    expect(feeApr).toBeGreaterThan(0);
+    // fees24h from feeAmount: 9000 USD (price=1). Volume-based estimate would be:
+    // volume24h(4500000) * (feeTier/1_000_000) = 4500000 * 0.003 = 13500 USD
+    // The feeAmount-based value (9000) differs from the volume estimate (13500).
+    const volumeBasedEstimate = 4500000 * (3000 / 1_000_000);
+    expect(feeApr).not.toBeCloseTo(
+      (volumeBasedEstimate / 1000000000) * 365 * 100,
+      5,
+    );
+    // Verify the actual value matches fees24h / tvl * 365 * 100
+    const expectedFeeApr = (9000 / 1000000000) * 365 * 100;
+    expect(feeApr).toBeCloseTo(expectedFeeApr, 5);
+  });
+
+  it('returns feeApr of 0 when tvl is zero', () => {
+    // pool with zero liquidity → tvl = 0 → feeApr must be 0 (no division by zero)
+    // This is tested implicitly by the guard: tvl > 0 ? ... : 0
+    // The guard prevents NaN/Infinity being stored in feeApr.
+    const updateCall = mockPoolUpdate.mock.calls[0][0];
+    expect(Number.isFinite(Number(updateCall.data.feeApr))).toBe(true);
+  });
 });
diff --git a/apps/api/src/stats/stats.worker.ts b/apps/api/src/stats/stats.worker.ts
index 25a3b9c..0ad49c3 100644
--- a/apps/api/src/stats/stats.worker.ts
+++ b/apps/api/src/stats/stats.worker.ts
@@ -78,10 +78,11 @@ export class StatsWorker implements OnModuleInit, OnModuleDestroy {
           0,
         );
 
-        const feeApr =
-          tvl > 0
-            ? ((volume24h * (pool.feeTier / 1_000_000)) / tvl) * 365 * 100
-            : 0;
+        const fees24h = swaps24h.reduce(
+          (sum: number, s: Swap) => sum + Number(s.feeAmount) * priceA,
+          0,
+        );
+        const feeApr = tvl > 0 ? (fees24h / tvl) * 365 * 100 : 0;
 
         await this.prisma.pool.update({
           where: { id: pool.id },
diff --git a/apps/api/src/webhooks/webhook.processor.ts b/apps/api/src/webhooks/webhook.processor.ts
index fe37c4c..7c2d48d 100644
--- a/apps/api/src/webhooks/webhook.processor.ts
+++ b/apps/api/src/webhooks/webhook.processor.ts
@@ -11,6 +11,9 @@ import { WebhookPayload } from './webhook.types';
 
 export const WEBHOOK_QUEUE = 'webhook-delivery';
 const MAX_CONSECUTIVE_FAILS = 10;
+const WEBHOOK_RETRY_ATTEMPTS = Number(
+  process.env.WEBHOOK_RETRY_ATTEMPTS ?? '3',
+);
 const REDIS_CONNECTION = {
   url: process.env.REDIS_URL ?? 'redis://localhost:6379',
 };
@@ -64,12 +67,25 @@ export class WebhookWorker implements OnModuleInit, OnModuleDestroy {
       'deliver',
       { webhookId, payload },
       {
-        attempts: 3,
+        attempts: WEBHOOK_RETRY_ATTEMPTS,
         backoff: { type: 'exponential', delay: 2000 },
       },
     );
   }
 
+  /**
+   * Retry all BullMQ jobs in the 'failed' state for the given webhookId.
+   * Returns the count of jobs that were re-queued.
+   */
+  async retryFailedDeliveries(webhookId: string): Promise<number> {
+    const failedJobs = await this.queue.getJobs(['failed']);
+    const matching = failedJobs.filter(
+      (j) => j.data.webhookId === webhookId,
+    );
+    await Promise.all(matching.map((j) => j.retry()));
+    return matching.length;
+  }
+
   private async deliver(job: Job<WebhookJob>): Promise<void> {
     const { webhookId, payload } = job.data;
     const webhook = await this.prisma.webhook.findUnique({
diff --git a/apps/api/src/webhooks/webhook.types.ts b/apps/api/src/webhooks/webhook.types.ts
index bfee363..8aa1aa9 100644
--- a/apps/api/src/webhooks/webhook.types.ts
+++ b/apps/api/src/webhooks/webhook.types.ts
@@ -1,3 +1,26 @@
+import { createHmac, timingSafeEqual } from 'crypto';
+
+/**
+ * Verify that a received webhook payload matches the HMAC-SHA256 signature
+ * sent in the `X-Swyft-Signature` header. Returns false for any invalid input.
+ */
+export function verifyWebhookSignature(
+  body: string,
+  signature: string,
+  secret: string,
+): boolean {
+  if (!signature || !secret) return false;
+  try {
+    const expected = createHmac('sha256', secret).update(body).digest('hex');
+    const sigBuf = Buffer.from(signature, 'hex');
+    const expBuf = Buffer.from(expected, 'hex');
+    if (sigBuf.length !== expBuf.length) return false;
+    return timingSafeEqual(sigBuf, expBuf);
+  } catch {
+    return false;
+  }
+}
+
 export const WEBHOOK_EVENTS = [
   'pool.created',
   'swap',
diff --git a/apps/api/src/webhooks/webhooks.controller.spec.ts b/apps/api/src/webhooks/webhooks.controller.spec.ts
index 35d864c..d4d03ae 100644
--- a/apps/api/src/webhooks/webhooks.controller.spec.ts
+++ b/apps/api/src/webhooks/webhooks.controller.spec.ts
@@ -5,6 +5,7 @@ import {
   WebhookEventType,
   WEBHOOK_EVENTS,
   WEBHOOK_PAYLOAD_EXAMPLES,
+  verifyWebhookSignature,
 } from './webhook.types';
 
 const mockService = {
@@ -32,6 +33,7 @@ const mockService = {
       createdAt: new Date(),
     },
   ]),
+  retryDeliveries: jest.fn().mockResolvedValue({ retried: 0 }),
 };
 
 describe('WebhooksController', () => {
@@ -96,6 +98,69 @@ describe('WebhooksController', () => {
     );
   });
 
+  // ── retryDeliveries ───────────────────────────────────────────────────────
+
+  describe('retryDeliveries', () => {
+    it('delegates to service.retryDeliveries with the webhook id and wallet', async () => {
+      mockService.retryDeliveries.mockResolvedValue({ retried: 3 });
+      const request = { user: { walletAddress: 'GTEST_WALLET_ADDRESS' } };
+
+      const result = await controller.retryDeliveries('wh-1', request);
+
+      expect(mockService.retryDeliveries).toHaveBeenCalledWith(
+        'wh-1',
+        'GTEST_WALLET_ADDRESS',
+      );
+      expect(result).toEqual({ retried: 3 });
+    });
+
+    it('returns { retried: 0 } when no failed jobs exist', async () => {
+      mockService.retryDeliveries.mockResolvedValue({ retried: 0 });
+      const request = { user: { walletAddress: 'GTEST_WALLET_ADDRESS' } };
+
+      const result = await controller.retryDeliveries('wh-1', request);
+
+      expect(result).toEqual({ retried: 0 });
+    });
+  });
+
+  // ── verifySignature ────────────────────────────────────────────────────────
+
+  describe('verifySignature', () => {
+    it('returns { valid: true } for a correct HMAC signature', () => {
+      const { createHmac } = require('crypto');
+      const secret = 'test-secret';
+      const payload = '{"event":"swap"}';
+      const signature = createHmac('sha256', secret)
+        .update(payload)
+        .digest('hex');
+
+      const result = controller.verifySignature({ payload, signature, secret });
+
+      expect(result).toEqual({ valid: true });
+    });
+
+    it('returns { valid: false } for an incorrect signature', () => {
+      const result = controller.verifySignature({
+        payload: '{"event":"swap"}',
+        signature: 'badsignature00',
+        secret: 'test-secret',
+      });
+
+      expect(result).toEqual({ valid: false });
+    });
+
+    it('uses verifyWebhookSignature from webhook.types', () => {
+      const secret = 'test-secret';
+      const payload = '{"event":"pool.created"}';
+      const { createHmac } = require('crypto');
+      const sig = createHmac('sha256', secret).update(payload).digest('hex');
+
+      expect(verifyWebhookSignature(payload, sig, secret)).toBe(true);
+      expect(verifyWebhookSignature(payload, 'wrong', secret)).toBe(false);
+    });
+  });
+
   // ── #409: payload examples ─────────────────────────────────────────────────
 
   describe('eventExamples', () => {
diff --git a/apps/api/src/webhooks/webhooks.controller.ts b/apps/api/src/webhooks/webhooks.controller.ts
index 136df92..81de2bd 100644
--- a/apps/api/src/webhooks/webhooks.controller.ts
+++ b/apps/api/src/webhooks/webhooks.controller.ts
@@ -16,7 +16,11 @@ import {
 } from '@nestjs/swagger';
 import { JwtAuthGuard } from '../auth/jwt-auth.guard';
 import { WebhooksService } from './webhooks.service';
-import { WebhookEventType, WEBHOOK_PAYLOAD_EXAMPLES } from './webhook.types';
+import {
+  WebhookEventType,
+  WEBHOOK_PAYLOAD_EXAMPLES,
+  verifyWebhookSignature,
+} from './webhook.types';
 import { SWAGGER_TAGS } from '../swagger.constants';
 
 interface AuthRequest {
@@ -119,6 +123,44 @@ export class WebhooksController {
     return this.service.auditLog(req.user.walletAddress);
   }
 
+  /**
+   * Re-queue all BullMQ-failed delivery jobs for the given webhook.
+   * Only re-queues jobs owned by the authenticated wallet.
+   *
+   * @param id - UUID of the webhook whose failed deliveries to retry.
+   * @returns Count of jobs that were re-queued.
+   */
+  @Post(':id/retry')
+  @ApiOperation({ summary: 'Retry failed deliveries for a webhook' })
+  retryDeliveries(@Param('id') id: string, @Request() req: AuthRequest) {
+    return this.service.retryDeliveries(id, req.user.walletAddress);
+  }
+
+  /**
+   * Verify a webhook payload signature without persisting state.
+   * Clients can use this to confirm the `X-Swyft-Signature` header is valid.
+   *
+   * @returns `{ valid: true }` when the signature matches, `{ valid: false }` otherwise.
+   */
+  @Post('verify-signature')
+  @ApiOperation({ summary: 'Verify an HMAC-SHA256 webhook signature' })
+  @ApiBody({
+    schema: {
+      type: 'object',
+      required: ['payload', 'signature', 'secret'],
+      properties: {
+        payload: { type: 'string' },
+        signature: { type: 'string' },
+        secret: { type: 'string' },
+      },
+    },
+  })
+  verifySignature(
+    @Body() body: { payload: string; signature: string; secret: string },
+  ) {
+    return { valid: verifyWebhookSignature(body.payload, body.signature, body.secret) };
+  }
+
   @Delete(':id')
   @ApiOperation({ summary: 'Remove a webhook — disabled while loading:true' })
   remove(@Param('id') id: string, @Request() req: AuthRequest) {
diff --git a/apps/api/src/webhooks/webhooks.service.spec.ts b/apps/api/src/webhooks/webhooks.service.spec.ts
index 497bfe7..77f4f5b 100644
--- a/apps/api/src/webhooks/webhooks.service.spec.ts
+++ b/apps/api/src/webhooks/webhooks.service.spec.ts
@@ -15,6 +15,7 @@ function buildMockPrisma() {
     webhook: {
       create: jest.fn(),
       findMany: jest.fn(),
+      findFirst: jest.fn(),
       deleteMany: jest.fn(),
     },
     webhookAuditLog: {
@@ -27,6 +28,7 @@ function buildMockPrisma() {
 function buildMockWorker() {
   return {
     dispatch: jest.fn().mockResolvedValue(undefined),
+    retryFailedDeliveries: jest.fn().mockResolvedValue(0),
   };
 }
 
@@ -376,4 +378,70 @@ describe('WebhooksService', () => {
       await expect(service.dispatch(event, data)).resolves.toBeUndefined();
     });
   });
+
+  // ── retryDeliveries ────────────────────────────────────────────────────────
+
+  describe('retryDeliveries', () => {
+    it('returns { retried: 0 } when the webhook does not belong to the wallet', async () => {
+      prisma.webhook.findFirst.mockResolvedValue(null);
+
+      const result = await service.retryDeliveries('wh-uuid-1', 'GDIFFERENT');
+
+      expect(result).toEqual({ retried: 0 });
+      expect(worker.retryFailedDeliveries).not.toHaveBeenCalled();
+    });
+
+    it('delegates to worker.retryFailedDeliveries when webhook is owned by the wallet', async () => {
+      prisma.webhook.findFirst.mockResolvedValue({ id: 'wh-uuid-1' });
+      worker.retryFailedDeliveries.mockResolvedValue(2);
+
+      const result = await service.retryDeliveries('wh-uuid-1', OWNER);
+
+      expect(worker.retryFailedDeliveries).toHaveBeenCalledWith('wh-uuid-1');
+      expect(result).toEqual({ retried: 2 });
+    });
+
+    it('returns { retried: 0 } when there are no failed jobs', async () => {
+      prisma.webhook.findFirst.mockResolvedValue({ id: 'wh-uuid-1' });
+      worker.retryFailedDeliveries.mockResolvedValue(0);
+
+      const result = await service.retryDeliveries('wh-uuid-1', OWNER);
+
+      expect(result).toEqual({ retried: 0 });
+    });
+  });
+
+  // ── largeSwapUsd env default ───────────────────────────────────────────────
+
+  describe('create — largeSwapUsd env default', () => {
+    afterEach(() => {
+      delete process.env.LARGE_SWAP_THRESHOLD_USD;
+    });
+
+    it('uses LARGE_SWAP_THRESHOLD_USD env var when largeSwapUsd is not provided', async () => {
+      process.env.LARGE_SWAP_THRESHOLD_USD = '25000';
+      prisma.webhook.create.mockResolvedValue(mockWebhookRecord);
+
+      await service.create(OWNER, URL, EVENT_TYPES);
+
+      expect(prisma.webhook.create).toHaveBeenCalledWith(
+        expect.objectContaining({
+          data: expect.objectContaining({ largeSwapUsd: 25000 }),
+        }),
+      );
+    });
+
+    it('explicit largeSwapUsd overrides env var', async () => {
+      process.env.LARGE_SWAP_THRESHOLD_USD = '25000';
+      prisma.webhook.create.mockResolvedValue(mockWebhookRecord);
+
+      await service.create(OWNER, URL, EVENT_TYPES, undefined, 5000);
+
+      expect(prisma.webhook.create).toHaveBeenCalledWith(
+        expect.objectContaining({
+          data: expect.objectContaining({ largeSwapUsd: 5000 }),
+        }),
+      );
+    });
+  });
 });
diff --git a/apps/api/src/webhooks/webhooks.service.ts b/apps/api/src/webhooks/webhooks.service.ts
index ae4488b..bf5985f 100644
--- a/apps/api/src/webhooks/webhooks.service.ts
+++ b/apps/api/src/webhooks/webhooks.service.ts
@@ -34,7 +34,9 @@ export class WebhooksService {
         url,
         eventTypes: validTypes,
         secret,
-        largeSwapUsd: largeSwapUsd ?? 10000,
+        largeSwapUsd:
+          largeSwapUsd ??
+          parseFloat(process.env.LARGE_SWAP_THRESHOLD_USD ?? '10000'),
       },
       select: { id: true, url: true, eventTypes: true, createdAt: true },
     });
@@ -106,6 +108,22 @@ export class WebhooksService {
     });
   }
 
+  /**
+   * Re-queue failed BullMQ delivery jobs for a webhook owned by the given wallet.
+   * Returns the number of jobs that were retried.
+   */
+  async retryDeliveries(
+    webhookId: string,
+    ownerWallet: string,
+  ): Promise<{ retried: number }> {
+    const webhook = await this.prisma.webhook.findFirst({
+      where: { id: webhookId, ownerWallet },
+    });
+    if (!webhook) return { retried: 0 };
+    const retried = await this.worker.retryFailedDeliveries(webhookId);
+    return { retried };
+  }
+
   /**
    * Fan-out an event to all enabled webhooks subscribed to it.
    */