diff --git a/docs/.vitepress/config.js b/docs/.vitepress/config.js
index b467638..7986f0e 100644
--- a/docs/.vitepress/config.js
+++ b/docs/.vitepress/config.js
@@ -21,7 +21,17 @@ module.exports = {
             {
               text: "Vision",
               link: "/introduction/vision",
-            }
+            },
+          ],
+        },
+        {
+          text: "Contract",
+          items: [
+            // TODO: Add explain for GST rules.
+            {
+              text: "GST Contract ABI",
+              link: "/contract/abi",
+            },
           ],
         },
         {
diff --git a/docs/contract/abi.md b/docs/contract/abi.md
new file mode 100644
index 0000000..0f457d9
--- /dev/null
+++ b/docs/contract/abi.md
@@ -0,0 +1,146 @@
+
+# GST Contract ABI
+
+This document provides detailed information about the ABI of the Bet smart contract. The contract facilitates goal-driven staking, offering two types of goals: Solo and Gambling. Users can create goals, stake tokens, confirm task completions, claim rewards, and settle goals.
+
+
+## Read Functions
+
+### 1. `getAllGoals()`
+
+- **Description**: Returns information about all goals.
+- **Returns**: `GoalInfo[]` - An array of goal information objects.
+  
+```solidity
+function getAllGoals() public view returns (GoalInfo[] memory)
+```
+
+### 2. `getUserGoals(address _user)`
+
+- **Description**: Returns the IDs of goals that a user is participating in.
+- **Parameters**: 
+  - `_user` (address): The address of the user.
+- **Returns**: `uint[]` - An array of goal IDs.
+  
+```solidity
+function getUserGoals(address _user) public view returns (uint[] memory)
+```
+
+### 3. `getGoalDetails(uint _goalId)`
+
+- **Description**: Returns detailed information about a specific goal.
+- **Parameters**: 
+  - `_goalId` (uint): The ID of the goal.
+- **Returns**: `GoalInfo` - An object containing the goal's details.
+  
+```solidity
+function getGoalDetails(uint _goalId) public view returns (GoalInfo memory)
+```
+
+## Write Functions
+
+### 1. `createGoalSolo(string memory _name, string memory _description, uint _requiredStake, uint _taskCount)`
+
+- **Description**: Creates a new solo goal.
+- **Parameters**:
+  - `_name` (string): The name of the goal.
+  - `_description` (string): A description of the goal.
+  - `_requiredStake` (uint): The required stake amount.
+  - `_taskCount` (uint): The number of tasks in the goal.
+
+```solidity
+function createGoalSolo(string memory _name, string memory _description, uint _requiredStake, uint _taskCount) public
+```
+
+### 2. `createGoal(string memory _name, string memory _description, uint _requiredStake, uint _taskCount)`
+
+- **Description**: Creates a new gambling goal.
+- **Parameters**:
+  - `_name` (string): The name of the goal.
+  - `_description` (string): A description of the goal.
+  - `_requiredStake` (uint): The required stake amount.
+  - `_taskCount` (uint): The number of tasks in the goal.
+
+```solidity
+function createGoal(string memory _name, string memory _description, uint _requiredStake, uint _taskCount) public
+```
+
+### 3. `stakeAndUnlockGoal(uint _goalId)`
+
+- **Description**: Stakes tokens and unlocks a goal for participation.
+- **Parameters**:
+  - `_goalId` (uint): The ID of the goal.
+
+```solidity
+function stakeAndUnlockGoal(uint _goalId) public payable
+```
+
+### 4. `confirmTaskCompletion(uint _goalId, address _user)`
+
+- **Description**: Confirms the completion of a task for a user in a specific goal.
+- **Parameters**:
+  - `_goalId` (uint): The ID of the goal.
+  - `_user` (address): The address of the user.
+
+```solidity
+function confirmTaskCompletion(uint _goalId, address _user) public
+```
+
+### 5. `claimStake(uint _goalId)`
+
+- **Description**: Claims the reward for a specific goal.
+- **Parameters**:
+  - `_goalId` (uint): The ID of the goal.
+
+```solidity
+function claimStake(uint _goalId) public
+```
+
+### 6. `settleGoal(uint _goalId)`
+
+- **Description**: Settles a gambling goal by distributing rewards based on task completion.
+- **Parameters**:
+  - `_goalId` (uint): The ID of the goal.
+
+```solidity
+function settleGoal(uint _goalId) public
+```
+
+## Events
+
+### 1. `GoalCreated`
+
+- **Parameters**:
+  - `id` (uint): The ID of the goal.
+  - `name` (string): The name of the goal.
+  - `description` (string): A description of the goal.
+  - `requiredStake` (uint): The required stake amount.
+  - `taskCount` (uint): The number of tasks in the goal.
+  - `goalType` (GoalType): The type of the goal (Solo or Gambling).
+  - `creator` (address): The address of the goal creator.
+
+### 2. `GoalUnlocked`
+
+- **Parameters**:
+  - `id` (uint): The ID of the goal.
+  - `user` (address): The address of the user.
+  - `stakeAmount` (uint): The amount staked by the user.
+
+### 3. `TaskConfirmed`
+
+- **Parameters**:
+  - `id` (uint): The ID of the goal.
+  - `user` (address): The address of the user.
+  - `taskIndex` (uint): The index of the confirmed task.
+
+### 4. `StakeClaimed`
+
+- **Parameters**:
+  - `id` (uint): The ID of the goal.
+  - `user` (address): The address of the user.
+  - `stakeAmount` (uint): The amount of the reward claimed by the user.
+
+### 5. `GoalSettled`
+
+- **Parameters**:
+  - `id` (uint): The ID of the goal.
diff --git a/package.json b/package.json
index bf6b5e4..50e398e 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,8 @@
   "main": "index.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
-    "docs:build": "vitepress build docs"
+    "docs:build": "vitepress build docs",
+    "docs:dev": "vitepress dev docs"
   },
   "keywords": [],
   "author": "",