diff --git a/package.json b/package.json
index 47047d3e7..ce25b6993 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@interlay/polkabtc",
-  "version": "0.14.1",
+  "version": "0.14.2",
   "description": "JavaScript library to interact with PolkaBTC",
   "main": "build/index.js",
   "typings": "build/index.d.ts",
@@ -40,7 +40,7 @@
   "dependencies": {
     "@interlay/esplora-btc-api": "0.4.0",
     "@interlay/polkabtc-types": "0.6.2",
-    "@types/big.js": "^4.0.5",
+    "@types/big.js": "4.0.5",
     "big.js": "6.0.3",
     "bitcoinjs-lib": "^5.2.0",
     "cross-fetch": "^3.0.6",
diff --git a/src/external/index.ts b/src/external/index.ts
index 921ea8d27..83c6e5d03 100644
--- a/src/external/index.ts
+++ b/src/external/index.ts
@@ -1 +1 @@
-export { ElectrsAPI } from "./electrs";
+export { ElectrsAPI, DefaultElectrsAPI } from "./electrs";
diff --git a/src/parachain/index.ts b/src/parachain/index.ts
index cef1f72db..2e812c3e8 100644
--- a/src/parachain/index.ts
+++ b/src/parachain/index.ts
@@ -1,14 +1,14 @@
-export { VaultsAPI } from "./vaults";
-export { IssueAPI, IssueRequestExt } from "./issue";
-export { RedeemAPI, RedeemRequestExt } from "./redeem";
-export { RefundAPI, RefundRequestExt } from "./refund";
-export { StakedRelayerAPI } from "./staked-relayer";
-export { OracleAPI } from "./oracle";
-export { BTCRelayAPI } from "./btc-relay";
-export { CollateralAPI } from "./collateral";
-export { TreasuryAPI } from "./treasury";
-export { SystemAPI } from "./system";
-export { ConstantsAPI } from "./constants";
-export { ReplaceAPI, ReplaceRequestExt } from "./replace";
-export { FeeAPI } from "./fee";
+export { VaultsAPI, DefaultVaultsAPI } from "./vaults";
+export { IssueAPI, DefaultIssueAPI, IssueRequestExt } from "./issue";
+export { RedeemAPI, DefaultRedeemAPI, RedeemRequestExt } from "./redeem";
+export { RefundAPI, DefaultRefundAPI, RefundRequestExt } from "./refund";
+export { StakedRelayerAPI, DefaultStakedRelayerAPI } from "./staked-relayer";
+export { OracleAPI, DefaultOracleAPI } from "./oracle";
+export { BTCRelayAPI, DefaultBTCRelayAPI } from "./btc-relay";
+export { CollateralAPI, DefaultCollateralAPI } from "./collateral";
+export { TreasuryAPI, DefaultTreasuryAPI } from "./treasury";
+export { SystemAPI , DefaultSystemAPI} from "./system";
+export { ConstantsAPI, DefaultConstantsAPI } from "./constants";
+export { ReplaceAPI, DefaultReplaceAPI, ReplaceRequestExt } from "./replace";
+export { FeeAPI, DefaultFeeAPI } from "./fee";
 export * from "./transaction";
diff --git a/src/utils/bitcoin-core-client.ts b/src/utils/bitcoin-core-client.ts
index a0c94e07b..d5980f8cb 100644
--- a/src/utils/bitcoin-core-client.ts
+++ b/src/utils/bitcoin-core-client.ts
@@ -83,9 +83,13 @@ export class BitcoinCoreClient {
         };
     }
 
-    async mineBlocks(n: number): Promise<void> {
+    async mineBlocksWithoutDelay(n: number): Promise<void> {
         const newWalletAddress = await this.client.command("getnewaddress");
         await this.client.command("generatetoaddress", n, newWalletAddress);
+    }
+
+    async mineBlocks(n: number): Promise<void> {
+        await this.mineBlocksWithoutDelay(n);
         // A block is relayed every 6000ms by the staked-relayer.
         // Wait an additional 100ms to be sure
         const relayPeriodWithBuffer = 6100;