diff --git a/apps/webapp/app/env.server.ts b/apps/webapp/app/env.server.ts
index 20925715b5..89b93f1012 100644
--- a/apps/webapp/app/env.server.ts
+++ b/apps/webapp/app/env.server.ts
@@ -1226,6 +1226,10 @@ const EnvironmentSchema = z
 
     REALTIME_STREAMS_S2_BASIN: z.string().optional(),
     REALTIME_STREAMS_S2_ACCESS_TOKEN: z.string().optional(),
+    REALTIME_STREAMS_S2_ACCESS_TOKEN_EXPIRATION_IN_MS: z.coerce
+      .number()
+      .int()
+      .default(60_000 * 60 * 24), // 1 day
     REALTIME_STREAMS_S2_LOG_LEVEL: z
       .enum(["log", "error", "warn", "info", "debug"])
       .default("info"),
diff --git a/apps/webapp/app/services/realtime/redisRealtimeStreams.server.ts b/apps/webapp/app/services/realtime/redisRealtimeStreams.server.ts
index b5c8c57322..25fb2d08e1 100644
--- a/apps/webapp/app/services/realtime/redisRealtimeStreams.server.ts
+++ b/apps/webapp/app/services/realtime/redisRealtimeStreams.server.ts
@@ -381,7 +381,7 @@ export class RedisRealtimeStreams implements StreamIngestor, StreamResponder {
       "chunkIndex",
       "0",
       "data",
-      part
+      JSON.stringify(part) + "\n"
     );
 
     // Set TTL for cleanup when stream is done
diff --git a/apps/webapp/app/services/realtime/s2realtimeStreams.server.ts b/apps/webapp/app/services/realtime/s2realtimeStreams.server.ts
index ebd1b2f6f4..1d03116ff5 100644
--- a/apps/webapp/app/services/realtime/s2realtimeStreams.server.ts
+++ b/apps/webapp/app/services/realtime/s2realtimeStreams.server.ts
@@ -1,4 +1,5 @@
 // app/realtime/S2RealtimeStreams.ts
+import type { UnkeyCache } from "@internal/cache";
 import { StreamIngestor, StreamResponder, StreamResponseOptions } from "./types";
 import { Logger, LogLevel } from "@trigger.dev/core/logger";
 import { randomUUID } from "node:crypto";
@@ -17,6 +18,12 @@ export type S2RealtimeStreamsOptions = {
 
   logger?: Logger;
   logLevel?: LogLevel;
+
+  accessTokenExpirationInMs?: number;
+
+  cache?: UnkeyCache<{
+    accessToken: string;
+  }>;
 };
 
 type S2IssueAccessTokenResponse = { access_token: string };
@@ -41,6 +48,12 @@ export class S2RealtimeStreams implements StreamResponder, StreamIngestor {
   private readonly logger: Logger;
   private readonly level: LogLevel;
 
+  private readonly accessTokenExpirationInMs: number;
+
+  private readonly cache?: UnkeyCache<{
+    accessToken: string;
+  }>;
+
   constructor(opts: S2RealtimeStreamsOptions) {
     this.basin = opts.basin;
     this.baseUrl = `https://${this.basin}.b.aws.s2.dev/v1`;
@@ -54,14 +67,13 @@ export class S2RealtimeStreams implements StreamResponder, StreamIngestor {
 
     this.logger = opts.logger ?? new Logger("S2RealtimeStreams", opts.logLevel ?? "info");
     this.level = opts.logLevel ?? "info";
-  }
 
-  private toStreamName(runId: string, streamId: string): string {
-    return `${this.toStreamPrefix(runId)}${streamId}`;
+    this.cache = opts.cache;
+    this.accessTokenExpirationInMs = opts.accessTokenExpirationInMs ?? 60_000 * 60 * 24; // 1 day
   }
 
-  private toStreamPrefix(runId: string): string {
-    return `${this.streamPrefix}/runs/${runId}/`;
+  private toStreamName(runId: string, streamId: string): string {
+    return `${this.streamPrefix}/runs/${runId}/${streamId}`;
   }
 
   async initializeStream(
@@ -70,11 +82,12 @@ export class S2RealtimeStreams implements StreamResponder, StreamIngestor {
   ): Promise<{ responseHeaders?: Record<string, string> }> {
     const id = randomUUID();
 
-    const accessToken = await this.s2IssueAccessToken(id, runId, streamId);
+    const accessToken = await this.getS2AccessToken(id);
 
     return {
       responseHeaders: {
         "X-S2-Access-Token": accessToken,
+        "X-S2-Stream-Name": `/runs/${runId}/${streamId}`,
         "X-S2-Basin": this.basin,
         "X-S2-Flush-Interval-Ms": this.flushIntervalMs.toString(),
         "X-S2-Max-Retries": this.maxRetries.toString(),
@@ -153,7 +166,23 @@ export class S2RealtimeStreams implements StreamResponder, StreamIngestor {
     return (await res.json()) as S2AppendAck;
   }
 
-  private async s2IssueAccessToken(id: string, runId: string, streamId: string): Promise<string> {
+  private async getS2AccessToken(id: string): Promise<string> {
+    if (!this.cache) {
+      return this.s2IssueAccessToken(id);
+    }
+
+    const result = await this.cache.accessToken.swr(this.streamPrefix, async () => {
+      return this.s2IssueAccessToken(id);
+    });
+
+    if (!result.val) {
+      throw new Error("Failed to get S2 access token");
+    }
+
+    return result.val;
+  }
+
+  private async s2IssueAccessToken(id: string): Promise<string> {
     // POST /v1/access-tokens
     const res = await fetch(`https://aws.s2.dev/v1/access-tokens`, {
       method: "POST",
@@ -169,10 +198,10 @@ export class S2RealtimeStreams implements StreamResponder, StreamIngestor {
           },
           ops: ["append", "create-stream"],
           streams: {
-            prefix: this.toStreamPrefix(runId),
+            prefix: this.streamPrefix,
           },
         },
-        expires_at: new Date(Date.now() + 1000 * 60 * 60 * 24).toISOString(), // 1 day
+        expires_at: new Date(Date.now() + this.accessTokenExpirationInMs).toISOString(),
         auto_prefix_streams: true,
       }),
     });
diff --git a/apps/webapp/app/services/realtime/v1StreamsGlobal.server.ts b/apps/webapp/app/services/realtime/v1StreamsGlobal.server.ts
index d913d510fb..34792cba03 100644
--- a/apps/webapp/app/services/realtime/v1StreamsGlobal.server.ts
+++ b/apps/webapp/app/services/realtime/v1StreamsGlobal.server.ts
@@ -1,9 +1,16 @@
+import {
+  createCache,
+  createMemoryStore,
+  DefaultStatefulContext,
+  Namespace,
+  RedisCacheStore,
+} from "@internal/cache";
 import { env } from "~/env.server";
 import { singleton } from "~/utils/singleton";
-import { RedisRealtimeStreams } from "./redisRealtimeStreams.server";
 import { AuthenticatedEnvironment } from "../apiAuth.server";
-import { StreamIngestor, StreamResponder } from "./types";
+import { RedisRealtimeStreams } from "./redisRealtimeStreams.server";
 import { S2RealtimeStreams } from "./s2realtimeStreams.server";
+import { StreamIngestor, StreamResponder } from "./types";
 
 function initializeRedisRealtimeStreams() {
   return new RedisRealtimeStreams({
@@ -44,9 +51,43 @@ export function getRealtimeStreamInstance(
         flushIntervalMs: env.REALTIME_STREAMS_S2_FLUSH_INTERVAL_MS,
         maxRetries: env.REALTIME_STREAMS_S2_MAX_RETRIES,
         s2WaitSeconds: env.REALTIME_STREAMS_S2_WAIT_SECONDS,
+        accessTokenExpirationInMs: env.REALTIME_STREAMS_S2_ACCESS_TOKEN_EXPIRATION_IN_MS,
+        cache: s2RealtimeStreamsCache,
       });
     }
 
     throw new Error("Realtime streams v2 is required for this run but S2 configuration is missing");
   }
 }
+
+const s2RealtimeStreamsCache = singleton(
+  "s2RealtimeStreamsCache",
+  initializeS2RealtimeStreamsCache
+);
+
+function initializeS2RealtimeStreamsCache() {
+  const ctx = new DefaultStatefulContext();
+  const redisCacheStore = new RedisCacheStore({
+    name: "s2-realtime-streams-cache",
+    connection: {
+      port: env.REALTIME_STREAMS_REDIS_PORT,
+      host: env.REALTIME_STREAMS_REDIS_HOST,
+      username: env.REALTIME_STREAMS_REDIS_USERNAME,
+      password: env.REALTIME_STREAMS_REDIS_PASSWORD,
+      enableAutoPipelining: true,
+      ...(env.REALTIME_STREAMS_REDIS_TLS_DISABLED === "true" ? {} : { tls: {} }),
+      keyPrefix: "s2-realtime-streams-cache:",
+    },
+    useModernCacheKeyBuilder: true,
+  });
+
+  const memoryStore = createMemoryStore(5000, 0.001);
+
+  return createCache({
+    accessToken: new Namespace<string>(ctx, {
+      stores: [memoryStore, redisCacheStore],
+      fresh: Math.floor(env.REALTIME_STREAMS_S2_ACCESS_TOKEN_EXPIRATION_IN_MS / 2),
+      stale: Math.floor(env.REALTIME_STREAMS_S2_ACCESS_TOKEN_EXPIRATION_IN_MS / 2 + 60_000),
+    }),
+  });
+}
diff --git a/packages/core/src/v3/realtimeStreams/streamInstance.ts b/packages/core/src/v3/realtimeStreams/streamInstance.ts
index 6982066afa..5efbcb225a 100644
--- a/packages/core/src/v3/realtimeStreams/streamInstance.ts
+++ b/packages/core/src/v3/realtimeStreams/streamInstance.ts
@@ -50,7 +50,7 @@ export class StreamInstance<T> implements StreamsWriter {
           })
         : new StreamsWriterV2({
             basin: parsedResponse.basin,
-            stream: this.options.key,
+            stream: parsedResponse.streamName ?? this.options.key,
             accessToken: parsedResponse.accessToken,
             source: this.options.source,
             signal: this.options.signal,
@@ -105,6 +105,7 @@ type ParsedStreamResponse =
       basin: string;
       flushIntervalMs?: number;
       maxRetries?: number;
+      streamName?: string;
     };
 
 function parseCreateStreamResponse(
@@ -124,6 +125,7 @@ function parseCreateStreamResponse(
 
   const flushIntervalMs = headers?.["x-s2-flush-interval-ms"];
   const maxRetries = headers?.["x-s2-max-retries"];
+  const streamName = headers?.["x-s2-stream-name"];
 
   return {
     version: "v2",
@@ -131,6 +133,7 @@ function parseCreateStreamResponse(
     basin,
     flushIntervalMs: flushIntervalMs ? parseInt(flushIntervalMs) : undefined,
     maxRetries: maxRetries ? parseInt(maxRetries) : undefined,
+    streamName,
   };
 }