diff --git a/sdks/typescript/index.ts b/sdks/typescript/index.ts
index 17e5cdcc..63d78dd1 100644
--- a/sdks/typescript/index.ts
+++ b/sdks/typescript/index.ts
@@ -19,7 +19,7 @@
  */
 
 
-import { Exchange, Polymarket, Kalshi, KalshiDemo, Limitless, Myriad, Probable, Baozi, Opinion, Metaculus, Smarkets, PolymarketUS, GeminiTitan, Hyperliquid, SuiBets, Suibets, Rain, Hunch, Mock } from "./pmxt/client.js";
+import { Exchange, Polymarket, Kalshi, KalshiDemo, Limitless, Myriad, Probable, Baozi, Opinion, Metaculus, Smarkets, PolymarketUS, Polymarket_us, GeminiTitan, Hyperliquid, SuiBets, Suibets, Rain, Hunch, Mock } from "./pmxt/client.js";
 import { Router } from "./pmxt/router.js";
 import { ServerManager } from "./pmxt/server-manager.js";
 import { FeedClient } from "./pmxt/feed-client.js";
@@ -28,7 +28,7 @@ import * as errors from "./pmxt/errors.js";
 
 export const __version__ = "2.17.1";
 
-export { Exchange, Polymarket, Kalshi, KalshiDemo, Limitless, Myriad, Probable, Baozi, Opinion, Metaculus, Smarkets, PolymarketUS, GeminiTitan, Hyperliquid, SuiBets, Suibets, Rain, Hunch, Mock, PolymarketOptions } from "./pmxt/client.js";
+export { Exchange, Polymarket, Kalshi, KalshiDemo, Limitless, Myriad, Probable, Baozi, Opinion, Metaculus, Smarkets, PolymarketUS, Polymarket_us, GeminiTitan, Hyperliquid, SuiBets, Suibets, Rain, Hunch, Mock, PolymarketOptions } from "./pmxt/client.js";
 export type { ExchangeOptions, SuiBetsOptions } from "./pmxt/client.js";
 export { FeedClient } from "./pmxt/feed-client.js";
 export type { Ticker, Tickers, OHLCV, Market as FeedMarket, OracleRound, FeedClientOptions } from "./pmxt/feed-client.js";
@@ -97,6 +97,7 @@ const pmxt = {
     Metaculus,
     Smarkets,
     PolymarketUS,
+    Polymarket_us,
     GeminiTitan,
     Hyperliquid,
     SuiBets,
diff --git a/sdks/typescript/pmxt/client.ts b/sdks/typescript/pmxt/client.ts
index 41eadab9..b6e8e806 100644
--- a/sdks/typescript/pmxt/client.ts
+++ b/sdks/typescript/pmxt/client.ts
@@ -3484,6 +3484,9 @@ export class PolymarketUS extends Exchange {
     }
 }
 
+// Backwards-compatible snake_case alias matching the Python SDK export.
+export const Polymarket_us = PolymarketUS;
+
 /**
  * Gemini Titan exchange client.
  *
diff --git a/sdks/typescript/tests/public-exports.test.ts b/sdks/typescript/tests/public-exports.test.ts
index acc17a0f..4967674b 100644
--- a/sdks/typescript/tests/public-exports.test.ts
+++ b/sdks/typescript/tests/public-exports.test.ts
@@ -16,4 +16,15 @@ describe('public exports', () => {
     const client = new pmxt.FeedClient('chainlink');
     expect(client).toBeInstanceOf(DirectFeedClient);
   });
+
+  it('exports Polymarket_us as an alias of PolymarketUS', () => {
+    expect(pmxt.Polymarket_us).toBe(pmxt.PolymarketUS);
+    expect(pmxt.default.Polymarket_us).toBe(pmxt.PolymarketUS);
+  });
+
+  it('constructs Polymarket_us with the canonical exchange name', () => {
+    const exchange = new pmxt.Polymarket_us({ autoStartServer: false });
+    expect(exchange).toBeInstanceOf(pmxt.PolymarketUS);
+    expect(exchange.exchangeName).toBe('polymarket_us');
+  });
 });