diff --git a/CHANGELOG.md b/CHANGELOG.md
index a436e096..309a8e72 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+## [18.3.0](https://github.com/lifinance/types/compare/v18.2.0...v18.3.0) (2026-08-27)
+
+
+### Features
+
+* add gasless request flags to `QuoteRequest` and `RouteOptions` ([ff71a15](https://github.com/lifinance/types/commit/ff71a15beaa9599b7083550ebfb3996a8b6c7494))
+
 ## [18.2.0](https://github.com/lifinance/types/compare/v18.1.0...v18.2.0) (2026-08-05)
 
 
diff --git a/package.json b/package.json
index 6605dda6..04aeb54c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@lifi/types",
-  "version": "18.2.0",
+  "version": "18.3.0",
   "description": "Types for the LI.FI stack",
   "keywords": [
     "sdk",
diff --git a/src/api.ts b/src/api.ts
index 9aabe1be..d3bad6b8 100644
--- a/src/api.ts
+++ b/src/api.ts
@@ -164,6 +164,12 @@ export interface RouteOptionsBase {
   /** Whether to include routes that require a transaction or a message, or both
    * @default 'transaction' */
   executionType?: ExecutionType
+
+  /** Opt the request into gasless execution. The returned steps carry signable
+   * typed data instead of a `transactionRequest`, and a relay fee is deducted
+   * from the input amount as a `feeCosts` entry named `LIFI Gasless Relay Fee`.
+   * @default false */
+  gasless?: boolean
 }
 
 /**
@@ -493,6 +499,12 @@ export interface QuoteRequest extends ToolConfiguration, TimingStrings {
    * @default 'transaction' */
   executionType?: ExecutionType
 
+  /** Opt the request into gasless execution. The response returns signable
+   * typed data instead of a `transactionRequest`, and a relay fee is deducted
+   * from the input amount as a `feeCosts` entry named `LIFI Gasless Relay Fee`.
+   * @default false */
+  gasless?: boolean
+
   /** SVM specific option, without it implicit source swaps routes are discarded */
   jitoBundle?: boolean