diff --git a/package.json b/package.json
index 44583d36..6f6d6de5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@lifi/types",
-  "version": "17.85.0",
+  "version": "17.85.0-beta.2",
   "description": "Types for the LI.FI stack",
   "keywords": [
     "sdk",
diff --git a/src/api.ts b/src/api.ts
index 74d71796..a465c200 100644
--- a/src/api.ts
+++ b/src/api.ts
@@ -227,6 +227,15 @@ export interface RouteOptions extends RouteOptionsBase {
    * When provided, this preset will override other route options with optimized settings */
   preset?: string
 
+  /** Opt into amount-flexible routing where the underlying tool supports it.
+   * Instead of a fixed minimum output, an amount-flexible route carries a signed
+   * rate, deposit bounds and an expiry alongside a deposit address, letting the
+   * user fund a variable amount within those bounds. Currently honored only by
+   * cross-chain Smart Deposit Address routes; ignored by tools that do not
+   * support it.
+   * @default false */
+  amountFlexible?: boolean
+
   /** Whether the user wants to insure their tx
    * @deprecated This property is deprecated and will be removed in future versions. */
   insurance?: boolean