diff --git a/features/keychain/api/__tests__/index.test.js b/features/keychain/api/__tests__/index.test.js
index bc73c60..aceeb11 100644
--- a/features/keychain/api/__tests__/index.test.js
+++ b/features/keychain/api/__tests__/index.test.js
@@ -159,6 +159,29 @@ describe('keychain api', () => {
       expect(data.compare(decrypted)).toBe(0)
     })
 
+    test('should encrypt and decrypt data with external keypair', async () => {
+      const {
+        box: { publicKey: toPublicKey },
+      } = await api.sodium.getKeysFromSeed({ seedId: otherSeedId, keyId })
+
+      const data = Buffer.from("Harvey Dent's identity was revealed as the Riddler")
+      const encrypted = await api.sodium.encryptBox({ seedId, keyId, data, toPublicKey })
+
+      expect(encrypted).toBeInstanceOf(Buffer)
+
+      const {
+        box: { publicKey: fromPublicKey },
+      } = await api.sodium.getKeysFromSeed({ seedId, keyId })
+
+      const decrypted = await api.sodium.decryptBox({
+        seedId: otherSeedId,
+        keyId,
+        data: encrypted,
+        fromPublicKey,
+      })
+      expect(data.compare(decrypted)).toBe(0)
+    })
+
     test('sign signs data', async () => {
       const data = Buffer.from("Batman's identity was revealed as Harvey Dent")
       const signed = await api.sodium.sign({ seedId, keyId, data })
diff --git a/features/keychain/api/index.d.ts b/features/keychain/api/index.d.ts
index f2e0653..79d1519 100644
--- a/features/keychain/api/index.d.ts
+++ b/features/keychain/api/index.d.ts
@@ -27,6 +27,8 @@ export interface KeychainApi {
     ): Promise<{ box: { publicKey: Buffer }; sign: { publicKey: Buffer } }>
     encryptSecretBox(params: { data: Buffer } & KeySource): Promise<Buffer>
     decryptSecretBox(params: { data: Buffer } & KeySource): Promise<Buffer>
+    encryptBox(params: { data: Buffer; toPublicKey: Buffer } & KeySource): Promise<Buffer>
+    decryptBox(params: { data: Buffer; fromPublicKey: Buffer } & KeySource): Promise<Buffer>
   }
   ed25519: {
     signBuffer(params: { data: Buffer } & KeySource): Promise<Buffer>
@@ -34,6 +36,7 @@ export interface KeychainApi {
   secp256k1: {
     signBuffer(params: { data: Buffer } & KeySource): Promise<Buffer>
     signBuffer(params: { data: Buffer; enc: 'der' } & KeySource): Promise<Buffer>
+    signSchnorr(params: { data: Buffer; tweak?: Buffer } & KeySource): Promise<Buffer>
   }
 }
 
diff --git a/features/keychain/api/index.js b/features/keychain/api/index.js
index 2661b0d..ce82827 100644
--- a/features/keychain/api/index.js
+++ b/features/keychain/api/index.js
@@ -8,6 +8,8 @@ const createKeychainApi = ({ keychain }) => {
         signDetached: keychain.sodium.signDetached,
         encryptSecretBox: keychain.sodium.encryptSecretBox,
         decryptSecretBox: keychain.sodium.decryptSecretBox,
+        encryptBox: keychain.sodium.encryptBox,
+        decryptBox: keychain.sodium.decryptBox,
         getKeysFromSeed: (...args) =>
           keychain.sodium.getKeysFromSeed(...args).then(({ box, sign }) => ({ box, sign })),
       },