diff --git a/src/api/exchange/_methods/userSetAbstraction.ts b/src/api/exchange/_methods/userSetAbstraction.ts
index d90de573..c6dba670 100644
--- a/src/api/exchange/_methods/userSetAbstraction.ts
+++ b/src/api/exchange/_methods/userSetAbstraction.ts
@@ -26,7 +26,7 @@ export const UserSetAbstractionRequest = /* @__PURE__ */ (() => {
       /** User address. */
       user: Address,
       /** Abstraction mode to set. */
-      abstraction: v.picklist(["disabled", "unifiedAccount", "portfolioMargin"]),
+      abstraction: v.picklist(["disabled", "unifiedAccount", "portfolioMargin", "dexAbstraction"]),
       /** Nonce (timestamp in ms) used to prevent replay attacks. */
       nonce: UnsignedInteger,
     }),
@@ -111,6 +111,8 @@ function toMultiSigPayloadAction(action: Readonly<Record<string, unknown>>): Rec
   if (action.abstraction === "disabled") return { ...action, abstraction: "i" };
   if (action.abstraction === "unifiedAccount") return { ...action, abstraction: "u" };
   if (action.abstraction === "portfolioMargin") return { ...action, abstraction: "p" };
+  // "dexAbstraction" has no single-letter wire form; the full name goes through unchanged
+  // (verified accepted by the exchange's action deserializer).
   return action;
 }
 
diff --git a/src/api/info/_methods/userAbstraction.ts b/src/api/info/_methods/userAbstraction.ts
index 577e55fb..dbf0004e 100644
--- a/src/api/info/_methods/userAbstraction.ts
+++ b/src/api/info/_methods/userAbstraction.ts
@@ -24,7 +24,7 @@ export type UserAbstractionRequest = v.InferOutput<typeof UserAbstractionRequest
  * User abstraction state.
  * @see https://hyperliquid.gitbook.io/hyperliquid-docs/for-developers/api/info-endpoint#query-a-users-abstraction-state
  */
-export type UserAbstractionResponse = "unifiedAccount" | "portfolioMargin" | "disabled" | "default";
+export type UserAbstractionResponse = "unifiedAccount" | "portfolioMargin" | "disabled" | "default" | "dexAbstraction";
 
 // ============================================================
 // Execution Logic
diff --git a/src/api/subscription/_methods/webData3.ts b/src/api/subscription/_methods/webData3.ts
index 6303b1d7..ffd38e98 100644
--- a/src/api/subscription/_methods/webData3.ts
+++ b/src/api/subscription/_methods/webData3.ts
@@ -55,7 +55,7 @@ export type WebData3Event = {
     /** Whether DEX abstraction is enabled. */
     dexAbstractionEnabled?: boolean;
     /** Abstraction mode for the user account. */
-    abstraction?: "unifiedAccount" | "portfolioMargin" | "disabled";
+    abstraction?: "unifiedAccount" | "portfolioMargin" | "disabled" | "dexAbstraction";
   };
   /** Array of perpetual DEX states. */
   perpDexStates: {
diff --git a/tests/api/exchange/_client.test.ts b/tests/api/exchange/_client.test.ts
index ebaf70bc..299ba253 100644
--- a/tests/api/exchange/_client.test.ts
+++ b/tests/api/exchange/_client.test.ts
@@ -624,12 +624,26 @@ describe("ExchangeClient multi-sig paths (offline)", () => {
     }
   });
 
+  test("userSetAbstraction: dexAbstraction passes through to the multi-sig payload unmapped", async () => {
+    const { calls, transport } = recordingTransport();
+    const client = new ExchangeClient(multiSigConfig(transport));
+
+    // dexAbstraction has no single-letter wire form — the full name goes through unchanged.
+    await client.userSetAbstraction({ user: MULTI_SIG_USER, abstraction: "dexAbstraction" });
+
+    assertEquals(calls.length, 1);
+    const payload = calls[0].payload.action.payload as { action: Record<string, unknown> };
+    assertEquals(payload.action.abstraction, "dexAbstraction");
+    assertEquals(payload.action.user, MULTI_SIG_USER);
+  });
+
   test("userSetAbstraction: an unmapped abstraction passes through on the skipValidation path", async () => {
     const { calls, transport } = recordingTransport();
     const client = new ExchangeClient(multiSigConfig(transport));
 
     // Only reachable with validation skipped: the schema restricts abstraction to the three
-    // mapped values, so any other string exercises the payload-mapping passthrough branch.
+    // letter-mapped values plus dexAbstraction, so any other string exercises the
+    // payload-mapping passthrough branch.
     await client.userSetAbstraction({ user: MULTI_SIG_USER, abstraction: "other" as never }, { skipValidation: true });
 
     assertEquals(calls.length, 1);
diff --git a/tests/api/exchange/userSetAbstraction.test.ts b/tests/api/exchange/userSetAbstraction.test.ts
index 6b649495..2038cc17 100644
--- a/tests/api/exchange/userSetAbstraction.test.ts
+++ b/tests/api/exchange/userSetAbstraction.test.ts
@@ -40,7 +40,9 @@ runTest({
       "Portfolio margin requires account value of $10000 or total volume of $5000000.",
     );
 
-    schemaCoverage(paramsSchema, params);
+    // "dexAbstraction" is accepted server-side (verified against the exchange deserializer)
+    // but flipping the shared live test account into that mode would leak into other tests.
+    schemaCoverage(paramsSchema, params, ["#/properties/abstraction/enum/3"]);
     schemaCoverage(responseSchema, data);
   },
 });
diff --git a/tests/api/info/userAbstraction.test.ts b/tests/api/info/userAbstraction.test.ts
index 1f2ed792..a78ef74b 100644
--- a/tests/api/info/userAbstraction.test.ts
+++ b/tests/api/info/userAbstraction.test.ts
@@ -23,7 +23,9 @@ runTest({
     const data = await Promise.all(params.map((p) => client.userAbstraction(p)));
 
     schemaCoverage(paramsSchema, params);
-    schemaCoverage(responseSchema, data);
+    // "dexAbstraction" (#/enum/4) is accepted server-side (verified against the exchange
+    // deserializer) but no testnet account is in that mode, so it can't be produced live.
+    schemaCoverage(responseSchema, data, ["#/enum/4"]);
   },
 });
 
diff --git a/tests/api/subscription/client.test.ts b/tests/api/subscription/client.test.ts
index cae6db91..f798dcae 100644
--- a/tests/api/subscription/client.test.ts
+++ b/tests/api/subscription/client.test.ts
@@ -391,7 +391,7 @@ const CASES: MethodCase[] = [
     invalid: [(client) => client.webData3({ user: "0x123" } as never, () => {})],
     channel: "webData3",
     payload: { type: "webData3", user: USER },
-    match: { userState: { user: USER }, perpDexStates: [] },
+    match: { userState: { user: USER, abstraction: "dexAbstraction" }, perpDexStates: [] },
     misses: [{ userState: { user: OTHER_USER }, perpDexStates: [] }],
   },
 ];
diff --git a/tests/api/subscription/webData3.test.ts b/tests/api/subscription/webData3.test.ts
index 1cc04793..77e165be 100644
--- a/tests/api/subscription/webData3.test.ts
+++ b/tests/api/subscription/webData3.test.ts
@@ -28,6 +28,8 @@ runTest({
     schemaCoverage(responseSchema, data.flat(), [
       "#/properties/userState/properties/agentAddress/defined",
       "#/properties/userState/properties/agentValidUntil/defined",
+      // No testnet account in dexAbstraction mode, so that enum branch can't be produced live.
+      "#/properties/userState/properties/abstraction/enum/3",
     ]);
   },
 });