diff --git a/client/PublicRequestTypes.ts b/client/PublicRequestTypes.ts
index a7cde705..7865b0ed 100644
--- a/client/PublicRequestTypes.ts
+++ b/client/PublicRequestTypes.ts
@@ -624,6 +624,17 @@ export interface SignPolygonTransactionRequest extends BasicRequest, RelayReques
     permit?: {
         tokenNonce: number,
     };
+
+    /**
+     * The amount of USDC to transfer. Required when calling the contract
+     * methods 'redeem' and 'redeemWithSecretInData' for HTLCs.
+     */
+    amount?: number;
+    /**
+     * The label of the sending address. Required when calling the contract
+     * methods 'redeem' and 'redeemWithSecretInData' for HTLCs.
+     */
+    senderLabel?: string;
 }
 
 export interface SignedPolygonTransaction {
diff --git a/src/lib/RequestTypes.ts b/src/lib/RequestTypes.ts
index ada6919c..faf2e35c 100644
--- a/src/lib/RequestTypes.ts
+++ b/src/lib/RequestTypes.ts
@@ -160,6 +160,8 @@ export interface ParsedSignPolygonTransactionRequest extends ParsedBasicRequest,
     permit?: {
         tokenNonce: number,
     };
+    amount?: number;
+    senderLabel?: string;
 }
 
 /**