diff --git a/package.json b/package.json
index 5f0a33edf..9f5f4fbd5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@paraswap/dex-lib",
-  "version": "4.0.8",
+  "version": "4.0.6-rfq-pub-sub.0",
   "main": "build/index.js",
   "types": "build/index.d.ts",
   "repository": "https://github.com/paraswap/paraswap-dex-lib",
diff --git a/src/abi/fluid-dex/fluid-dex.abi.json b/src/abi/fluid-dex/fluid-dex.abi.json
index cdd5e0f1a..b884a89b6 100644
--- a/src/abi/fluid-dex/fluid-dex.abi.json
+++ b/src/abi/fluid-dex/fluid-dex.abi.json
@@ -381,15 +381,13 @@
   },
   {
     "anonymous": false,
-    "inputs": [
-    ],
+    "inputs": [],
     "name": "LogPauseSwapAndArbitrage",
     "type": "event"
   },
   {
     "anonymous": false,
-    "inputs": [
-    ],
+    "inputs": [],
     "name": "LogUnpauseSwapAndArbitrage",
     "type": "event"
   },
diff --git a/src/dex-helper/dummy-dex-helper.ts b/src/dex-helper/dummy-dex-helper.ts
index c147c4525..5b922e14f 100644
--- a/src/dex-helper/dummy-dex-helper.ts
+++ b/src/dex-helper/dummy-dex-helper.ts
@@ -43,6 +43,23 @@ class DummyCache implements ICache {
     return null;
   }
 
+  async keys(
+    dexKey: string,
+    network: number,
+    cacheKey: string,
+  ): Promise<string[]> {
+    return [];
+  }
+
+  async ttl(
+    dexKey: string,
+    network: number,
+    cacheKey: string,
+  ): Promise<number> {
+    const key = `${network}_${dexKey}_${cacheKey}`.toLowerCase();
+    return this.storage[key] ? 1 : -1;
+  }
+
   async rawget(key: string): Promise<string | null> {
     return this.storage[key] ? this.storage[key] : null;
     return null;
@@ -139,6 +156,10 @@ class DummyCache implements ICache {
     return set.has(key);
   }
 
+  async smembers(setKey: string): Promise<string[]> {
+    return Array.from(this.setMap[setKey] ?? []);
+  }
+
   async hset(mapKey: string, key: string, value: string): Promise<void> {
     if (!this.hashStorage[mapKey]) this.hashStorage[mapKey] = {};
     this.hashStorage[mapKey][key] = value;
diff --git a/src/dex-helper/icache.ts b/src/dex-helper/icache.ts
index 90bcf313b..bc2d4b821 100644
--- a/src/dex-helper/icache.ts
+++ b/src/dex-helper/icache.ts
@@ -5,6 +5,10 @@ export interface ICache {
     cacheKey: string,
   ): Promise<string | null>;
 
+  ttl(dexKey: string, network: number, cacheKey: string): Promise<number>;
+
+  keys(dexKey: string, network: number, cacheKey: string): Promise<string[]>;
+
   rawget(key: string): Promise<string | null>;
 
   rawset(key: string, value: string, ttl: number): Promise<string | null>;
@@ -52,6 +56,8 @@ export interface ICache {
 
   sismember(setKey: string, key: string): Promise<boolean>;
 
+  smembers(setKey: string): Promise<string[]>;
+
   hset(mapKey: string, key: string, value: string): Promise<void>;
 
   hdel(mapKey: string, keys: string[]): Promise<number>;
diff --git a/src/dex/generic-rfq/generic-rfq.ts b/src/dex/generic-rfq/generic-rfq.ts
index d358fffe8..5dfe85006 100644
--- a/src/dex/generic-rfq/generic-rfq.ts
+++ b/src/dex/generic-rfq/generic-rfq.ts
@@ -447,12 +447,7 @@ export class GenericRFQ extends ParaSwapLimitOrders {
   }
 
   async setBlacklist(userAddress: string): Promise<boolean> {
-    await this.dexHelper.cache.hset(
-      this.rateFetcher.blackListCacheKey,
-      userAddress.toLowerCase(),
-      'true',
-    );
-    return true;
+    return this.rateFetcher.setBlacklist(userAddress);
   }
 
   releaseResources(): void {
diff --git a/src/dex/generic-rfq/rate-fetcher.ts b/src/dex/generic-rfq/rate-fetcher.ts
index ae5ef30cb..46db952e6 100644
--- a/src/dex/generic-rfq/rate-fetcher.ts
+++ b/src/dex/generic-rfq/rate-fetcher.ts
@@ -37,6 +37,7 @@ import {
   ERC1271Contract,
 } from '../../lib/erc1271-utils';
 import { isContractAddress } from '../../utils';
+import { ExpKeyValuePubSub, NonExpSetPubSub } from '../../lib/pub-sub';
 
 const GET_FIRM_RATE_TIMEOUT_MS = 2000;
 export const reversePrice = (price: PriceAndAmountBigNumber) =>
@@ -55,6 +56,9 @@ export class RateFetcher {
   private addressToTokenMap: Record<string, TokenWithInfo> = {};
   private pairs: PairMap = {};
 
+  private pricesPubSub: ExpKeyValuePubSub;
+  private blacklistPubSub?: NonExpSetPubSub;
+
   private firmRateAuth?: (options: RequestConfig) => void;
 
   public blackListCacheKey: string;
@@ -123,6 +127,13 @@ export class RateFetcher {
       logger,
     );
 
+    this.pricesPubSub = new ExpKeyValuePubSub(
+      this.dexHelper,
+      this.dexKey,
+      'prices',
+    );
+
+    this.blackListCacheKey = `${this.dexHelper.config.data.network}_${this.dexKey}_blacklist`;
     if (config.blacklistConfig) {
       this.blackListFetcher = new Fetcher<BlackListResponse>(
         dexHelper.httpRequest,
@@ -142,9 +153,14 @@ export class RateFetcher {
         config.blacklistConfig.intervalMs,
         logger,
       );
+
+      this.blacklistPubSub = new NonExpSetPubSub(
+        this.dexHelper,
+        this.dexKey,
+        'blacklist',
+      );
     }
 
-    this.blackListCacheKey = `${this.dexHelper.config.data.network}_${this.dexKey}_blacklist`;
     if (this.config.firmRateConfig.secret) {
       this.firmRateAuth = this.authHttp(this.config.firmRateConfig.secret);
     }
@@ -161,6 +177,16 @@ export class RateFetcher {
         this.config.maker,
       );
     }
+
+    if (this.dexHelper.config.isSlave) {
+      this.pricesPubSub.subscribe();
+      if (this.blacklistPubSub) {
+        const initSet = await this.dexHelper.cache.smembers(
+          this.blackListCacheKey,
+        );
+        this.blacklistPubSub.initializeAndSubscribe(initSet);
+      }
+    }
   }
 
   start() {
@@ -214,16 +240,22 @@ export class RateFetcher {
     for (const address of resp.blacklist) {
       this.dexHelper.cache.sadd(this.blackListCacheKey, address.toLowerCase());
     }
+
+    if (this.blacklistPubSub) {
+      this.blacklistPubSub.publish(resp.blacklist);
+    }
   }
 
   public isBlackListed(userAddress: string) {
-    return this.dexHelper.cache.sismember(
-      this.blackListCacheKey,
-      userAddress.toLowerCase(),
-    );
+    if (this.blacklistPubSub) {
+      return this.blacklistPubSub.has(userAddress.toLowerCase());
+    }
+    return false;
   }
 
   private handleRatesResponse(resp: RatesResponse) {
+    const pubSubData: Record<string, unknown> = {};
+    const ttl = this.config.rateConfig.dataTTLS;
     const pairs = this.pairs;
 
     if (isEmpty(pairs)) return;
@@ -252,37 +284,51 @@ export class RateFetcher {
       }
 
       if (prices.bids.length) {
+        const key = `${baseToken.address}_${quoteToken.address}_bids`;
+        const value = prices.bids;
+        pubSubData[key] = value;
+
         this.dexHelper.cache.setex(
           this.dexKey,
           this.dexHelper.config.data.network,
-          `${baseToken.address}_${quoteToken.address}_bids`,
-          this.config.rateConfig.dataTTLS,
-          JSON.stringify(prices.bids),
+          key,
+          ttl,
+          JSON.stringify(value),
         );
         currentPricePairs.add(`${baseToken.address}_${quoteToken.address}`);
       }
 
       if (prices.asks.length) {
+        const key = `${baseToken.address}_${quoteToken.address}_asks`;
+        const value = prices.asks;
+        pubSubData[key] = value;
+
         this.dexHelper.cache.setex(
           this.dexKey,
           this.dexHelper.config.data.network,
-          `${baseToken.address}_${quoteToken.address}_asks`,
-          this.config.rateConfig.dataTTLS,
-          JSON.stringify(prices.asks),
+          key,
+          ttl,
+          JSON.stringify(value),
         );
         currentPricePairs.add(`${quoteToken.address}_${baseToken.address}`);
       }
     });
 
     if (currentPricePairs.size > 0) {
+      const key = `pairs`;
+      const value = Array.from(currentPricePairs);
+      pubSubData[key] = value;
+
       this.dexHelper.cache.setex(
         this.dexKey,
         this.dexHelper.config.data.network,
-        `pairs`,
-        this.config.rateConfig.dataTTLS,
-        JSON.stringify(Array.from(currentPricePairs)),
+        key,
+        ttl,
+        JSON.stringify(value),
       );
     }
+
+    this.pricesPubSub.publish(pubSubData, ttl);
   }
 
   checkHealth(): boolean {
@@ -322,17 +368,13 @@ export class RateFetcher {
   }
 
   public async getAvailablePairs(): Promise<string[]> {
-    const pairs = await this.dexHelper.cache.get(
-      this.dexKey,
-      this.dexHelper.config.data.network,
-      `pairs`,
-    );
+    const pairs = await this.pricesPubSub.getAndCache<string[]>(`pairs`);
 
     if (!pairs) {
       return [];
     }
 
-    return JSON.parse(pairs) as string[];
+    return pairs;
   }
 
   public async getOrderPrice(
@@ -342,49 +384,36 @@ export class RateFetcher {
   ): Promise<PriceAndAmountBigNumber[] | null> {
     let reversed = false;
 
-    let pricesAsString: string | null = null;
+    let prices: PriceAndAmount[] | null = null;
     if (side === SwapSide.SELL) {
-      pricesAsString = await this.dexHelper.cache.get(
-        this.dexKey,
-        this.dexHelper.config.data.network,
+      prices = await this.pricesPubSub.getAndCache(
         `${srcToken.address}_${destToken.address}_bids`,
       );
 
-      if (!pricesAsString) {
-        pricesAsString = await this.dexHelper.cache.get(
-          this.dexKey,
-          this.dexHelper.config.data.network,
+      if (!prices) {
+        prices = await this.pricesPubSub.getAndCache(
           `${destToken.address}_${srcToken.address}_asks`,
         );
         reversed = true;
       }
     } else {
-      pricesAsString = await this.dexHelper.cache.get(
-        this.dexKey,
-        this.dexHelper.config.data.network,
+      prices = await this.pricesPubSub.getAndCache(
         `${destToken.address}_${srcToken.address}_asks`,
       );
 
-      if (!pricesAsString) {
-        pricesAsString = await this.dexHelper.cache.get(
-          this.dexKey,
-          this.dexHelper.config.data.network,
+      if (!prices) {
+        prices = await this.pricesPubSub.getAndCache(
           `${srcToken.address}_${destToken.address}_bids`,
         );
         reversed = true;
       }
     }
 
-    if (!pricesAsString) {
+    if (!prices) {
       return null;
     }
 
-    const orderPricesAsString: PriceAndAmount[] = JSON.parse(pricesAsString);
-    if (!orderPricesAsString) {
-      return null;
-    }
-
-    let orderPrices = orderPricesAsString.map(price => [
+    let orderPrices = prices.map(price => [
       new BigNumber(price[0]),
       new BigNumber(price[1]),
     ]);
@@ -483,4 +512,16 @@ export class RateFetcher {
       throw e;
     }
   }
+
+  async setBlacklist(userAddress: string): Promise<boolean> {
+    await this.dexHelper.cache.hset(
+      this.blackListCacheKey,
+      userAddress.toLowerCase(),
+      'true',
+    );
+    if (this.blacklistPubSub) {
+      this.blacklistPubSub.publish([userAddress.toLowerCase()]);
+    }
+    return true;
+  }
 }
diff --git a/src/lib/pub-sub.ts b/src/lib/pub-sub.ts
new file mode 100644
index 000000000..3684d6f0f
--- /dev/null
+++ b/src/lib/pub-sub.ts
@@ -0,0 +1,147 @@
+import NodeCache from 'node-cache';
+import { Network } from '../constants';
+import { IDexHelper } from '../dex-helper';
+import { Logger } from '../types';
+
+type KeyValuePubSubMsg = {
+  expiresAt: number;
+  data: Record<string, unknown>;
+};
+
+type SetPubSubMsg = string[];
+
+export class ExpKeyValuePubSub {
+  channel: string;
+  network: Network;
+  localCache: NodeCache = new NodeCache();
+
+  logger: Logger;
+
+  constructor(
+    private dexHelper: IDexHelper,
+    private dexKey: string,
+    channel: string,
+    private defaultValue?: any,
+    private defaultTTL?: number,
+  ) {
+    this.network = this.dexHelper.config.data.network;
+    this.channel = `${this.network}_${this.dexKey}_${channel}`;
+
+    this.logger = this.dexHelper.getLogger(`ExpKeyValuePubSub_${this.channel}`);
+  }
+
+  subscribe() {
+    this.logger.info(`Subscribing to ${this.channel}`);
+
+    this.dexHelper.cache.subscribe(this.channel, (_, msg) => {
+      const decodedMsg = JSON.parse(msg) as KeyValuePubSubMsg;
+      this.handleSubscription(decodedMsg);
+    });
+  }
+
+  publish(data: Record<string, unknown>, ttl: number) {
+    const expiresAt = Math.round(Date.now() / 1000) + ttl;
+    this.dexHelper.cache.publish(
+      this.channel,
+      JSON.stringify({ expiresAt, data }),
+    );
+  }
+
+  handleSubscription(msg: KeyValuePubSubMsg) {
+    const { expiresAt, data } = msg;
+
+    const now = Math.round(Date.now() / 1000);
+    // calculating ttl as message might come with the delay
+    const ttl = expiresAt - now;
+
+    if (ttl > 0) {
+      const keys = Object.keys(data);
+      for (const key of keys) {
+        this.localCache.set(key, data[key], ttl);
+      }
+    } else {
+      this.logger.error('Message has expired', {
+        now,
+        expiresAt,
+        diffInSeconds: now - expiresAt,
+        keys: Object.keys(data),
+      });
+    }
+  }
+
+  async getAndCache<T>(key: string): Promise<T | null> {
+    const localValue = this.localCache.get<T>(key);
+
+    if (localValue) {
+      return localValue;
+    }
+
+    const [value, ttl] = await Promise.all([
+      this.dexHelper.cache.get(this.dexKey, this.network, key),
+      this.dexHelper.cache.ttl(this.dexKey, this.network, key),
+    ]);
+
+    if (value && ttl > 0) {
+      const parsedValue = JSON.parse(value);
+      this.localCache.set(key, parsedValue, ttl);
+      return parsedValue;
+    }
+
+    if (this.defaultValue && this.defaultTTL && this.defaultTTL > 0) {
+      this.localCache.set(key, this.defaultValue, this.defaultTTL);
+      return this.defaultValue;
+    }
+
+    return null;
+  }
+}
+
+export class NonExpSetPubSub {
+  channel: string;
+  network: Network;
+  set = new Set<string>();
+
+  logger: Logger;
+
+  constructor(
+    private dexHelper: IDexHelper,
+    private dexKey: string,
+    channel: string,
+  ) {
+    this.network = this.dexHelper.config.data.network;
+    this.channel = `${this.network}_${this.dexKey}_${channel}`;
+
+    this.logger = this.dexHelper.getLogger(`NonExpSetPubSub_${this.channel}`);
+  }
+
+  async initializeAndSubscribe(initialSet: string[]) {
+    for (const member of initialSet) {
+      this.set.add(member);
+    }
+
+    this.subscribe();
+  }
+
+  subscribe() {
+    this.logger.info(`Subscribing to ${this.channel}`);
+
+    this.dexHelper.cache.subscribe(this.channel, (_, msg) => {
+      const decodedMsg = JSON.parse(msg) as SetPubSubMsg;
+      this.handleSubscription(decodedMsg);
+    });
+  }
+
+  publish(msg: SetPubSubMsg) {
+    this.dexHelper.cache.publish(this.channel, JSON.stringify(msg));
+  }
+
+  handleSubscription(set: SetPubSubMsg) {
+    for (const key of set) {
+      this.set.add(key);
+    }
+  }
+
+  async has(key: string) {
+    return this.set.has(key);
+  }
+}