diff --git a/src/index.ts b/src/index.ts
index 3dcf448..7476e29 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -36,4 +36,5 @@ export { getMultichainClient, getDefaultTransport, getExternallyConnectableTrans
 export type * from './types/transport';
 export type * from './types/session';
 export type * from './types/multichainApi';
+export type * from './types/scopes';
 export * from './types/errors';
diff --git a/src/types/scopes/eip155.types.ts b/src/types/scopes/eip155.types.ts
index 659bf22..798cd1e 100644
--- a/src/types/scopes/eip155.types.ts
+++ b/src/types/scopes/eip155.types.ts
@@ -1,15 +1,15 @@
 import type { RpcMethod } from '.';
 
 // Base types
-type HexString = `0x${string}`;
-type Address = `0x${string}`;
-type Hash32 = `0x${string}`;
-type BlockTag = 'earliest' | 'finalized' | 'safe' | 'latest' | 'pending';
-type BlockNumberOrTag = HexString | BlockTag;
-type BlockNumberOrTagOrHash = HexString | BlockTag | Hash32;
+export type HexString = `0x${string}`;
+export type Address = `0x${string}`;
+export type Hash32 = `0x${string}`;
+export type BlockTag = 'earliest' | 'finalized' | 'safe' | 'latest' | 'pending';
+export type BlockNumberOrTag = HexString | BlockTag;
+export type BlockNumberOrTagOrHash = HexString | BlockTag | Hash32;
 
 // Complex types for method parameters and responses
-interface AddEthereumChainParameter {
+export interface AddEthereumChainParameter {
   chainId: HexString;
   chainName: string;
   nativeCurrency: {
@@ -22,7 +22,7 @@ interface AddEthereumChainParameter {
   iconUrls?: string[];
 }
 
-interface TypedData {
+export interface TypedData {
   types: {
     EIP712Domain: Array<{
       name: string;
@@ -38,7 +38,7 @@ interface TypedData {
   message: Record<string, any>;
 }
 
-interface WatchAssetOptions {
+export interface WatchAssetOptions {
   address: string;
   symbol?: string;
   decimals?: number;
@@ -46,14 +46,14 @@ interface WatchAssetOptions {
   tokenId?: string;
 }
 
-interface Call {
+export interface Call {
   to?: Address;
   data?: HexString;
   value?: HexString;
   capabilities?: Record<string, any>;
 }
 
-interface SendCallsParameter {
+export interface SendCallsParameter {
   version: string;
   id?: string;
   from: Address;
@@ -63,12 +63,12 @@ interface SendCallsParameter {
   capabilities?: Record<string, any>;
 }
 
-interface BatchResult {
+export interface BatchResult {
   id: string;
   capabilities?: Record<string, any>;
 }
 
-interface BatchStatus {
+export interface BatchStatus {
   version: string;
   id: string;
   chainId: HexString;
@@ -90,7 +90,7 @@ interface BatchStatus {
   capabilities?: Record<string, any>;
 }
 
-interface Transaction {
+export interface Transaction {
   from: Address;
   to?: Address;
   gas?: HexString;
@@ -108,14 +108,14 @@ interface Transaction {
   chainId?: HexString;
 }
 
-interface Filter {
+export interface Filter {
   fromBlock?: HexString;
   toBlock?: HexString;
   address?: Address | Address[];
   topics?: Array<HexString | HexString[] | null>;
 }
 
-interface Log {
+export interface Log {
   removed?: boolean;
   logIndex?: HexString;
   transactionIndex?: HexString;
@@ -127,7 +127,7 @@ interface Log {
   topics: HexString[];
 }
 
-interface Block {
+export interface Block {
   number: HexString;
   hash: Hash32;
   parentHash: Hash32;
@@ -161,7 +161,7 @@ interface Block {
   mixHash?: Hash32;
 }
 
-interface TransactionInfo {
+export interface TransactionInfo {
   blockHash: Hash32;
   blockNumber: HexString;
   from: Address;
@@ -187,7 +187,7 @@ interface TransactionInfo {
   yParity?: HexString;
 }
 
-interface TransactionReceipt {
+export interface TransactionReceipt {
   transactionHash: Hash32;
   transactionIndex: HexString;
   blockHash: Hash32;
@@ -206,7 +206,7 @@ interface TransactionReceipt {
   blobGasPrice?: HexString;
 }
 
-interface FeeHistory {
+export interface FeeHistory {
   oldestBlock: HexString;
   baseFeePerGas: HexString[];
   baseFeePerBlobGas?: HexString[];
@@ -215,7 +215,7 @@ interface FeeHistory {
   reward?: HexString[][];
 }
 
-interface AccountProof {
+export interface AccountProof {
   address: Address;
   accountProof: HexString[];
   balance: HexString;
@@ -229,7 +229,7 @@ interface AccountProof {
   }>;
 }
 
-type SyncingStatus =
+export type SyncingStatus =
   | boolean
   | {
       startingBlock: HexString;
diff --git a/src/types/scopes/index.ts b/src/types/scopes/index.ts
index c2b7932..06dc114 100644
--- a/src/types/scopes/index.ts
+++ b/src/types/scopes/index.ts
@@ -1,6 +1,7 @@
 import type { Bip122Rpc } from './bip122.types';
 import type { Eip155Rpc } from './eip155.types';
 import type { SolanaRpc } from './solana.types';
+import type { TronRpc } from './tron.types';
 
 export type RpcApi = Record<
   string,
@@ -34,4 +35,5 @@ export type DefaultRpcApi = {
   eip155: Eip155Rpc;
   solana: SolanaRpc;
   bip122: Bip122Rpc;
+  tron: TronRpc;
 };
diff --git a/src/types/scopes/tron.types.ts b/src/types/scopes/tron.types.ts
new file mode 100644
index 0000000..bc4cb67
--- /dev/null
+++ b/src/types/scopes/tron.types.ts
@@ -0,0 +1,64 @@
+import type { RpcMethod } from '.';
+
+/**
+ * A Base64-encoded message string.
+ * @example
+ * ```typescript
+ * const message = "Hello, Tron!";
+ * const base64Message = Buffer.from(message).toString('base64');
+ * ```
+ */
+export type Base64Message = string;
+
+/**
+ * A Tron address in Base58Check format, starting with 'T'.
+ * @example "TJRabPrwbZy45sbavfcjinPJC18kjpRTv8"
+ */
+export type TronAddress = `T${string}`;
+
+/**
+ * A signature.
+ */
+export type Signature = `0x${string}`;
+
+/**
+ * Signs a plain text message.
+ * The signature can be used to verify ownership of the account.
+ *
+ * @param address - The Tron address that will sign the message
+ * @param message - The message string in Base64 format to be signed
+ * @returns An object containing the hexadecimal signature of the message
+ */
+export type SignMessageMethod = RpcMethod<
+  {
+    address: TronAddress;
+    message: Base64Message;
+  },
+  { signature: Signature }
+>;
+
+/**
+ * Signs a Tron transaction.
+ *
+ * @param address - The Tron address that will sign the transaction
+ * @param transaction - The Tron transaction object containing `raw_data_hex` and `type`
+ * @returns An object containing the hexadecimal signature of the transaction
+ */
+export type SignTransactionMethod = RpcMethod<
+  {
+    address: TronAddress;
+    transaction: {
+      rawDataHex: string;
+      type: string;
+    };
+  },
+  { signature: Signature }
+>;
+
+export type TronRpc = {
+  methods: {
+    signMessage: SignMessageMethod;
+    signTransaction: SignTransactionMethod;
+  };
+  events: [];
+};
diff --git a/src/types/session.ts b/src/types/session.ts
index 1e94359..c3255f3 100644
--- a/src/types/session.ts
+++ b/src/types/session.ts
@@ -1,6 +1,21 @@
-type CaipAccountId = `${string}:${string}:${string}`;
-type CaipChainId = `${string}:${string}`;
-type Json =
+/**
+ * CAIP-10 Account ID type.
+ * Format: `<namespace>:<reference>:<address>`
+ * Example: `eip155:1:0xabc123...`
+ */
+export type CaipAccountId = `${string}:${string}:${string}`;
+
+/**
+ * CAIP Chain ID type.
+ * Format: `<namespace>:<reference>`
+ * Example:
+ *  - `eip155:1`
+ *  - `solana:mainnet`
+ *  - `tron:728126428`
+ */
+export type CaipChainId = `${string}:${string}`;
+
+export type Json =
   | string
   | number
   | boolean
diff --git a/tests/index.test-d.ts b/tests/index.test-d.ts
index ce94dad..1dbbb9d 100644
--- a/tests/index.test-d.ts
+++ b/tests/index.test-d.ts
@@ -1,5 +1,6 @@
 import { expectError, expectType } from 'tsd';
 import { getMultichainClient } from '../src/index';
+import type { Signature } from '../src/types/scopes/tron.types';
 import { getMockTransport } from './mocks';
 
 const client = getMultichainClient({ transport: getMockTransport() });
@@ -46,6 +47,20 @@ expectType<`0x${string}`>(
   }),
 );
 
+// Basic tron signMessage call with correct scope and parameters
+expectType<{ signature: Signature }>(
+  await client.invokeMethod({
+    scope: 'tron:728126428',
+    request: {
+      method: 'signMessage',
+      params: {
+        address: 'TJRabPrwbZy45sbavfcjinPJC18kjpRTv8',
+        message: 'aGVsbG8gd29ybGQ=',
+      },
+    },
+  }),
+);
+
 // ==========================================
 // Test error cases for invalid inputs
 // ==========================================