diff --git a/Cargo.toml b/Cargo.toml
index d59366f..954e596 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,7 +9,7 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-bdk = { version = "^0.12.1-dev", features = ["all-keys"] }
+bdk = { version = "^0.12.1-dev", features = ["all-keys", "use-esplora-ureq"] }
 uniffi_macros = "0.14.0"
 uniffi = "0.14.0"
 thiserror = "1.0"
diff --git a/src/bdk.udl b/src/bdk.udl
index 2ae60cc..1994bc1 100644
--- a/src/bdk.udl
+++ b/src/bdk.udl
@@ -41,6 +41,7 @@ enum BdkError {
   "Psbt",
   "PsbtParse",
   "Electrum",
+  "Esplora",
   "Sled",
 };
 
@@ -59,7 +60,7 @@ dictionary SledDbConfiguration {
 [Enum]
 interface DatabaseConfig {
   Memory(string junk);
-  Sled(SledDbConfiguration configuration);
+  Sled(SledDbConfiguration config);
 };
 
 interface OfflineWallet {
@@ -67,3 +68,30 @@ interface OfflineWallet {
     constructor(string descriptor, Network network, DatabaseConfig database_config);
     string get_new_address();
 };
+
+dictionary ElectrumConfig {
+    string url;
+    string? socks5;
+    u8 retry;
+    u8? timeout;
+    u64 stop_gap;
+};
+
+dictionary EsploraConfig {
+    string base_url;
+    string? proxy;
+    u64 timeout_read;
+    u64 timeout_write;
+    u64 stop_gap;
+};
+
+[Enum]
+interface BlockchainConfig {
+  Electrum(ElectrumConfig config);
+  Esplora(EsploraConfig config);
+};
+
+interface OnlineWallet {
+    [Throws=BdkError]
+    constructor(string descriptor, Network network, DatabaseConfig database_config, BlockchainConfig blockchain_config);
+};
diff --git a/src/lib.rs b/src/lib.rs
index cf0f756..ae6fcc3 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,10 +1,14 @@
 use bdk::bitcoin::Network;
+use bdk::blockchain::any::{AnyBlockchain, AnyBlockchainConfig};
+use bdk::blockchain::{
+    electrum::ElectrumBlockchainConfig, esplora::EsploraBlockchainConfig, ConfigurableBlockchain,
+};
 use bdk::database::any::{AnyDatabase, SledDbConfiguration};
 use bdk::database::{AnyDatabaseConfig, ConfigurableDatabase};
 use bdk::wallet::AddressIndex;
 use bdk::Error;
 use bdk::Wallet;
-
+use std::convert::TryFrom;
 use std::sync::Mutex;
 
 uniffi_macros::include_scaffolding!("bdk");
@@ -13,7 +17,28 @@ type BdkError = Error;
 
 pub enum DatabaseConfig {
     Memory { junk: String },
-    Sled { configuration: SledDbConfiguration },
+    Sled { config: SledDbConfiguration },
+}
+
+pub struct ElectrumConfig {
+    pub url: String,
+    pub socks5: Option<String>,
+    pub retry: u8,
+    pub timeout: Option<u8>,
+    pub stop_gap: u64,
+}
+
+pub struct EsploraConfig {
+    pub base_url: String,
+    pub proxy: Option<String>,
+    pub timeout_read: u64,
+    pub timeout_write: u64,
+    pub stop_gap: u64,
+}
+
+pub enum BlockchainConfig {
+    Electrum { config: ElectrumConfig },
+    Esplora { config: EsploraConfig },
 }
 
 struct OfflineWallet {
@@ -28,7 +53,7 @@ impl OfflineWallet {
     ) -> Result<Self, BdkError> {
         let any_database_config = match database_config {
             DatabaseConfig::Memory { .. } => AnyDatabaseConfig::Memory(()),
-            DatabaseConfig::Sled { configuration } => AnyDatabaseConfig::Sled(configuration),
+            DatabaseConfig::Sled { config } => AnyDatabaseConfig::Sled(config),
         };
         let database = AnyDatabase::from_config(&any_database_config)?;
         let wallet = Mutex::new(Wallet::new_offline(&descriptor, None, network, database)?);
@@ -46,4 +71,53 @@ impl OfflineWallet {
     }
 }
 
+struct OnlineWallet {
+    wallet: Mutex<Wallet<AnyBlockchain, AnyDatabase>>,
+}
+
+impl OnlineWallet {
+    fn new(
+        descriptor: String,
+        network: Network,
+        database_config: DatabaseConfig,
+        blockchain_config: BlockchainConfig,
+    ) -> Result<Self, BdkError> {
+        let any_database_config = match database_config {
+            DatabaseConfig::Memory { .. } => AnyDatabaseConfig::Memory(()),
+            DatabaseConfig::Sled { config } => AnyDatabaseConfig::Sled(config),
+        };
+        let any_blockchain_config = match blockchain_config {
+            BlockchainConfig::Electrum { config } => {
+                AnyBlockchainConfig::Electrum(ElectrumBlockchainConfig {
+                    retry: config.retry,
+                    socks5: config.socks5,
+                    timeout: config.timeout,
+                    url: config.url,
+                    stop_gap: usize::try_from(config.stop_gap).unwrap(),
+                })
+            }
+            BlockchainConfig::Esplora { config } => {
+                AnyBlockchainConfig::Esplora(EsploraBlockchainConfig {
+                    base_url: config.base_url,
+                    proxy: config.proxy,
+                    timeout_read: config.timeout_read,
+                    timeout_write: config.timeout_write,
+                    stop_gap: usize::try_from(config.stop_gap).unwrap(),
+                })
+            }
+        };
+        let database = AnyDatabase::from_config(&any_database_config)?;
+        let blockchain = AnyBlockchain::from_config(&any_blockchain_config)?;
+        let wallet = Mutex::new(Wallet::new(
+            &descriptor,
+            None,
+            network,
+            database,
+            blockchain,
+        )?);
+        Ok(OnlineWallet { wallet })
+    }
+}
+
 uniffi::deps::static_assertions::assert_impl_all!(OfflineWallet: Sync, Send);
+uniffi::deps::static_assertions::assert_impl_all!(OnlineWallet: Sync, Send);