diff --git a/api/_bridges/sponsored-intent/utils/common.ts b/api/_bridges/sponsored-intent/utils/common.ts
index 538573846..4a5ddd775 100644
--- a/api/_bridges/sponsored-intent/utils/common.ts
+++ b/api/_bridges/sponsored-intent/utils/common.ts
@@ -20,6 +20,7 @@ import {
   getFullRelayers,
   getTransferRestrictedRelayers,
 } from "../../../_relayer-address";
+import { signDigestWithSponsor } from "../../../_sponsorship-signature";
 
 export function getHyperEvmChainId(destinationChainId: number) {
   return [CHAIN_IDs.HYPEREVM, CHAIN_IDs.HYPERCORE].includes(destinationChainId)
@@ -60,7 +61,16 @@ export function getDepositMessage(params: {
 }) {
   const { outputToken, recipient } = params;
   if (isToHyperCore(outputToken.chainId)) {
-    return ethers.utils.defaultAbiCoder.encode(["address"], [recipient]);
+    const encodedRecipient = ethers.utils.defaultAbiCoder.encode(
+      ["address"],
+      [recipient]
+    );
+    const hashedRecipient = ethers.utils.keccak256(encodedRecipient);
+    const signature = signDigestWithSponsor(hashedRecipient);
+    return ethers.utils.defaultAbiCoder.encode(
+      ["address", "bytes"],
+      [recipient, signature]
+    );
   }
   return "0x";
 }
diff --git a/api/_bridges/sponsored-intent/utils/constants.ts b/api/_bridges/sponsored-intent/utils/constants.ts
index b7ceca2ad..e6e1e22d0 100644
--- a/api/_bridges/sponsored-intent/utils/constants.ts
+++ b/api/_bridges/sponsored-intent/utils/constants.ts
@@ -9,8 +9,9 @@ export const USDH_FILL_DESTINATION_GAS_LIMIT_USD = 0.25; // 0.25 USD
 
 // TODO: Pull from @across-protocol/contracts once `HyperliquidDepositHandler`
 // deployments are available upstream.
+// Taken from https://hyperevmscan.io/address/0x420D76Aa59A56953C920a1D1451b0B73147334F1
 export const HYPERLIQUID_DEPOSIT_HANDLER_ADDRESS =
-  "0x861E127036B28D32f3777B4676F6bbb9e007d195";
+  "0x420D76Aa59A56953C920a1D1451b0B73147334F1";
 
 export const SUPPORTED_INPUT_TOKENS = [
   TOKEN_SYMBOLS_MAP.USDC,
diff --git a/api/_sponsorship-signature.ts b/api/_sponsorship-signature.ts
index f79f33080..0b00ebbb1 100644
--- a/api/_sponsorship-signature.ts
+++ b/api/_sponsorship-signature.ts
@@ -23,7 +23,7 @@ export const getSponsorshipSigner = (): ethers.Wallet => {
 
 /**
  * Signs a raw digest with the sponsorship signer.
- * This is used for CCTP signatures where the contract expects a signature on the unprefixed hash.
+ * This is used for sponsored signatures where the contract expects a signature on the unprefixed hash.
  * @param {string} digest The raw digest to sign.
  * @returns {string} The signature string.
  */
@@ -34,17 +34,3 @@ export const signDigestWithSponsor = (digest: string): string => {
   const signature = signer._signingKey().signDigest(digest);
   return utils.joinSignature(signature);
 };
-
-/**
- * Signs a message with the sponsorship signer.
- * This adds the EIP-191 prefix to the message before signing.
- * Use this when the contract expects `toEthSignedMessageHash().recover()`.
- * @param {Uint8Array} message The message to sign.
- * @returns {Promise<string>} The signature string.
- */
-export const signMessageWithSponsor = (
-  message: Uint8Array
-): Promise<string> => {
-  const signer = getSponsorshipSigner();
-  return signer.signMessage(message);
-};
diff --git a/test/api/_bridges/sponsored-intent/common.test.ts b/test/api/_bridges/sponsored-intent/common.test.ts
index 5995febee..fb0d58d86 100644
--- a/test/api/_bridges/sponsored-intent/common.test.ts
+++ b/test/api/_bridges/sponsored-intent/common.test.ts
@@ -17,6 +17,7 @@ import {
   HYPERLIQUID_DEPOSIT_HANDLER_ADDRESS,
 } from "../../../../api/_bridges/sponsored-intent/utils/constants";
 import { USDC_ON_OPTIMISM, USDH_ON_HYPEREVM, USDH_ON_HYPERCORE } from "./utils";
+import { signDigestWithSponsor } from "../../../../api/_sponsorship-signature";
 
 jest.mock("../../../../api/_balance");
 jest.mock("../../../../api/_hypercore", () => ({
@@ -24,6 +25,9 @@ jest.mock("../../../../api/_hypercore", () => ({
   accountExistsOnHyperCore: jest.fn(),
 }));
 jest.mock("../../../../api/_relayer-address");
+jest.mock("../../../../api/_sponsorship-signature", () => ({
+  signDigestWithSponsor: jest.fn(),
+}));
 
 describe("api/_bridges/sponsored-intent/utils/common", () => {
   beforeEach(() => {
@@ -108,6 +112,12 @@ describe("api/_bridges/sponsored-intent/utils/common", () => {
   });
 
   describe("getDepositMessage", () => {
+    beforeEach(() => {
+      (signDigestWithSponsor as jest.Mock).mockReturnValue(
+        "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef"
+      );
+    });
+
     it("should return encoded address if to HyperCore", () => {
       const recipient = "0x0000000000000000000000000000000000000123";
       const outputToken = USDH_ON_HYPERCORE;