diff --git a/src/types/scopes/bip122.types.ts b/src/types/scopes/bip122.types.ts
new file mode 100644
index 0000000..1809c85
--- /dev/null
+++ b/src/types/scopes/bip122.types.ts
@@ -0,0 +1,50 @@
+import type { RpcMethod } from '.';
+
+type Utxo = {
+  // Outpoint of the utxo in the format <txid>:<vout>
+  outpoint: string;
+  // Value of output in satoshis
+  value: string;
+  derivationIndex: number;
+  // scriptPubley in ASM format
+  scriptPubkey: string;
+  scriptPubkeyHex: string;
+  // If the script can be represented as an address, omitted otherwise
+  address?: string;
+};
+
+export type Bip122Rpc = {
+  methods: {
+    signMessage: RpcMethod<
+      {
+        account: { address: string };
+        message: string;
+      },
+      { signature: string }
+    >;
+    sendTransfer: RpcMethod<
+      {
+        account: { address: string };
+        recipients: { address: string; amount: string }[];
+        feeRate?: number;
+      },
+      { txid: string }
+    >;
+    signPsbt: RpcMethod<
+      {
+        account: { address: string };
+        options: {
+          fill: boolean;
+          broadcast: boolean;
+        };
+        psbt: string;
+        feeRate?: number | undefined;
+      },
+      { psbt: string; txid: string | null }
+    >;
+    fillPsbt: RpcMethod<{ account: { address: string }; psbt: string }, { psbt: string }>;
+    broadcastPsbt: RpcMethod<{ account: { address: string }; psbt: string }, { txid: string }>;
+    computeFee: RpcMethod<{ account: { address: string }; psbt: string }, { fee: string }>;
+    getUtxo: RpcMethod<{ account: { address: string }; outpoint: string }, Utxo>;
+  };
+};
diff --git a/src/types/scopes/index.ts b/src/types/scopes/index.ts
index c9dba34..c2b7932 100644
--- a/src/types/scopes/index.ts
+++ b/src/types/scopes/index.ts
@@ -1,3 +1,4 @@
+import type { Bip122Rpc } from './bip122.types';
 import type { Eip155Rpc } from './eip155.types';
 import type { SolanaRpc } from './solana.types';
 
@@ -32,4 +33,5 @@ export type MethodReturn<T extends RpcApi, S extends Scope<T>, M extends MethodN
 export type DefaultRpcApi = {
   eip155: Eip155Rpc;
   solana: SolanaRpc;
+  bip122: Bip122Rpc;
 };