diff --git a/__tests__/08.custom-network.ava.ts b/__tests__/08.custom-network.ava.ts
index 8f26b7b8..2fc01a35 100644
--- a/__tests__/08.custom-network.ava.ts
+++ b/__tests__/08.custom-network.ava.ts
@@ -4,6 +4,8 @@ import anyTest, {TestFn} from 'ava';
 
 // To run this test, you need to set the NEAR_RPC_API_KEY environment variable tied the Pagoda testnet network.
 // And the NEAR_WORKSPACES_NETWORK environment variable to 'custom'.
+//
+// Sample: NEAR_WORKSPACES_NETWORK=custom NEAR_RPC_API_KEY="xxx" yarn test...
 if (getNetworkFromEnv() === 'custom' && process.env.NEAR_RPC_API_KEY !== '') {
   const test = anyTest as TestFn<{
     worker: Worker;
@@ -25,8 +27,14 @@ if (getNetworkFromEnv() === 'custom' && process.env.NEAR_RPC_API_KEY !== '') {
   });
 
   test('Ping network', async t => {
-    await t.context.worker.provider.block({finality: 'final'});
-    console.log('Network is alive!');
+    try {
+      await t.context.worker.provider.block({finality: 'final'});
+    } catch (error: unknown) {
+      t.fail(`Failed to ping the network: ${error as string}`);
+      return;
+    }
+
+    t.pass('Network pinged successfully!');
   });
 }
 
diff --git a/packages/js/dist/account/account-manager.d.ts b/packages/js/dist/account/account-manager.d.ts
index 3e627797..ab2d87e4 100644
--- a/packages/js/dist/account/account-manager.d.ts
+++ b/packages/js/dist/account/account-manager.d.ts
@@ -46,6 +46,14 @@ export declare abstract class AccountManager implements NearAccountManager {
     protected get networkId(): string;
     protected get connection(): nearAPI.Connection;
 }
+export declare class CustomnetManager extends AccountManager {
+    get DEFAULT_INITIAL_BALANCE(): string;
+    get defaultKeyStore(): KeyStore;
+    get connection(): nearAPI.Connection;
+    get networkId(): string;
+    init(): Promise<AccountManager>;
+    createFrom(config: Config): Promise<NearAccountManager>;
+}
 export declare class TestnetManager extends AccountManager {
     static readonly KEYSTORE_PATH: string;
     private static numTestAccounts;
diff --git a/packages/js/dist/account/account-manager.d.ts.map b/packages/js/dist/account/account-manager.d.ts.map
index 0741580d..1245c6e6 100644
--- a/packages/js/dist/account/account-manager.d.ts.map
+++ b/packages/js/dist/account/account-manager.d.ts.map
@@ -1 +1 @@
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\ No newline at end of file
+{"version":3,"file":"account-manager.d.ts","sourceRoot":"","sources":["../../src/account/account-manager.ts"],"names":[],"mappings":"AAEA,OAAO,KAAK,OAAO,MAAM,aAAa,CAAC;AACvC,OAAO,EAAC,IAAI,EAAC,MAAM,YAAY,CAAC;AAEhC,OAAO,EAAC,MAAM,EAAE,OAAO,EAAE,EAAE,EAAyC,QAAQ,EAAE,cAAc,EAAE,YAAY,EAAE,SAAS,EAAE,WAAW,EAAC,MAAM,UAAU,CAAC;AAEpJ,OAAO,EAAC,WAAW,EAAC,MAAM,gBAAgB,CAAC;AAC3C,OAAO,EAAC,eAAe,EAAC,MAAM,YAAY,CAAC;AAC3C,OAAO,EAAC,iBAAiB,EAAC,MAAM,uBAAuB,CAAC;AAExD,OAAO,EAAC,WAAW,EAAC,MAAM,gBAAgB,CAAC;AAE3C,OAAO,EAAC,kBAAkB,EAAC,MAAM,wBAAwB,CAAC;AAE1D,8BAAsB,cAAe,YAAW,kBAAkB;IAI9D,SAAS,CAAC,MAAM,EAAE,MAAM;IAH1B,eAAe,EAAE,GAAG,CAAC,MAAM,CAAC,CAAa;IACzC,OAAO,CAAC,KAAK,CAAC,CAAc;gBAEhB,MAAM,EAAE,MAAM;IAG1B,MAAM,CAAC,MAAM,CACX,MAAM,EAAE,MAAM,GACb,cAAc;IAaX,WAAW,CAAC,SAAS,EAAE,MAAM,GAAG,OAAO,CAAC,WAAW,CAAC;IAI1D,UAAU,CAAC,SAAS,EAAE,MAAM,GAAG,WAAW;IAI1C,gBAAgB,CAAC,SAAS,EAAE,MAAM,GAAG,WAAW;IAS1C,SAAS,CACb,SAAS,EAAE,MAAM,GAChB,OAAO,CAAC,IAAI,CAAC;IASV,IAAI,IAAI,OAAO,CAAC,cAAc,CAAC;IAIrC,IAAI,IAAI,IAAI,WAAW,CAMtB;IAED,IAAI,cAAc,IAAI,MAAM,CAE3B;IAED,IAAI,oBAAoB,IAAI,EAAE,CAE7B;IAED,IAAI,QAAQ,IAAI,eAAe,CAE9B;IAED,KAAK,CAAC,MAAM,EAAE,WAAW,GAAG,MAAM,EAAE,QAAQ,EAAE,WAAW,GAAG,MAAM,GAAG,WAAW;IAI1E,MAAM,CAAC,SAAS,EAAE,MAAM,GAAG,OAAO,CAAC,OAAO,GAAG,IAAI,CAAC;IAIlD,YAAY,CAAC,SAAS,EAAE,MAAM,GAAG,OAAO,CAAC,SAAS,GAAG,IAAI,CAAC;IAIhE,kEAAkE;IAC5D,MAAM,CAAC,SAAS,EAAE,MAAM,EAAE,OAAO,CAAC,EAAE,OAAO,GAAG,OAAO,CAAC,OAAO,CAAC;IAO9D,SAAS,CAAC,SAAS,EAAE,MAAM,GAAG,OAAO,CAAC,IAAI,CAAC;IAI3C,aAAa,CAAC,SAAS,EAAE,MAAM,EAAE,aAAa,EAAE,MAAM,EAAE,OAAO,CAAC,EAAE,OAAO,GAAG,OAAO,CAAC,iBAAiB,CAAC;IAatG,UAAU,IAAI,OAAO,CAAC,OAAO,CAAC;IAS9B,OAAO,CAAC,OAAO,EAAE,MAAM,GAAG,WAAW,GAAG,OAAO,CAAC,cAAc,CAAC;IAI/D,gBAAgB,CAAC,OAAO,EAAE,MAAM,GAAG,WAAW,GAAG,OAAO,CAAC,IAAI,CAAC;IAI9D,MAAM,CAAC,SAAS,EAAE,MAAM,GAAG,WAAW,GAAG,OAAO,CAAC,OAAO,CAAC;IAIzD,eAAe,CAAC,OAAO,EAAE,MAAM,GAAG,WAAW,EAAE,MAAM,EAAE,EAAE,GAAG,OAAO,CAAC,OAAO,CAAC;IAI5E,kBAAkB,CAAC,EAAE,EAAE,WAAW,EAAE,OAAO,CAAC,EAAE,OAAO,GAAG,OAAO,CAAC,iBAAiB,CAAC;IAsCxF,iBAAiB,CAAC,OAAO,EAAE,MAAM,EAAE,OAAO,EAAE,MAAM,GAAG,IAAI;IAInD,OAAO,IAAI,OAAO,CAAC,IAAI,CAAC;IAE9B,IAAI,aAAa,IAAI,MAAM,CAE1B;IAED,SAAS,KAAK,aAAa,CAAC,KAAK,EAAE,MAAM,EAExC;IAED,QAAQ,KAAK,uBAAuB,IAAI,MAAM,CAAC;IAC/C,QAAQ,CAAC,UAAU,CAAC,MAAM,EAAE,MAAM,GAAG,OAAO,CAAC,kBAAkB,CAAC;IAChE,QAAQ,KAAK,eAAe,IAAI,QAAQ,CAAC;IAEzC,SAAS,KAAK,QAAQ,IAAI,QAAQ,CAEjC;IAED,SAAS,KAAK,MAAM,IAAI,OAAO,CAAC,cAAc,CAE7C;IAED,SAAS,KAAK,SAAS,IAAI,MAAM,CAEhC;IAED,SAAS,KAAK,UAAU,IAAI,OAAO,CAAC,UAAU,CAE7C;CACF;AAED,qBAAa,gBAAiB,SAAQ,cAAc;IAClD,IAAI,uBAAuB,IAAI,MAAM,CAEpC;IAED,IAAI,eAAe,IAAI,QAAQ,CAE9B;IAED,IAAI,UAAU,IAAI,OAAO,CAAC,UAAU,CAEnC;IAED,IAAI,SAAS,IAAI,MAAM,CAEtB;IAEK,IAAI,IAAI,OAAO,CAAC,cAAc,CAAC;IAI/B,UAAU,CAAC,MAAM,EAAE,MAAM,GAAG,OAAO,CAAC,kBAAkB,CAAC;CAG9D;AAED,qBAAa,cAAe,SAAQ,cAAc;IAChD,MAAM,CAAC,QAAQ,CAAC,aAAa,EAAE,MAAM,CAA+D;IACpG,OAAO,CAAC,MAAM,CAAC,eAAe,CAAK;IAEnC,OAAO,CAAC,YAAY,CAAC,CAAc;IAEnC,MAAM,KAAK,eAAe,IAAI,QAAQ,CAKrC;IAED,IAAI,eAAe,IAAI,MAAM,CAS5B;IAED,IAAI,iBAAiB,IAAI,MAAM,CAE9B;IAED,IAAI,IAAI,IAAI,WAAW,CAMtB;IAED,IAAI,uBAAuB,IAAI,MAAM,CAEpC;IAED,IAAI,eAAe,IAAI,QAAQ,CAE9B;IAED,IAAI,iBAAiB,IAAI,OAAO,CAAC,cAAc,CAAC,iBAAiB,CAKhE;IAEK,IAAI,IAAI,OAAO,CAAC,cAAc,CAAC;IAY/B,+BAA+B,CAAC,SAAS,EAAE,MAAM,EAAE,OAAO,EAAE,OAAO,GAAG,OAAO,CAAC,IAAI,CAAC;IAInF,aAAa,CAAC,SAAS,EAAE,MAAM,EAAE,OAAO,CAAC,EAAE,OAAO,GAAG,OAAO,CAAC,WAAW,CAAC;IAYzE,mBAAmB,CAAC,SAAS,GAAE,MAA+B,GAAG,OAAO,CAAC,IAAI,CAAC;IAe9E,QAAQ,CAAC,SAAS,EAAE,MAAM,EAAE,MAAM,EAAE,EAAE,GAAG,OAAO,CAAC,IAAI,CAAC;IAatD,cAAc,CAAC,QAAQ,EAAE,MAAM,EAAE,EAAE,aAAa,EAAE,MAAM,GAAG,OAAO,CAAC,IAAI,EAAE,CAAC;IAU1E,UAAU,CAAC,MAAM,EAAE,MAAM,GAAG,OAAO,CAAC,cAAc,CAAC;IAQnD,OAAO,IAAI,OAAO,CAAC,IAAI,CAAC;IAIxB,UAAU,CAAC,SAAS,EAAE,MAAM,EAAE,MAAM,EAAE,EAAE,GAAG,OAAO,CAAC,OAAO,CAAC;IAKjE,iBAAiB,CAAC,SAAS,EAAE,MAAM,GAAG,OAAO;CAG9C;AAED,qBAAa,cAAe,SAAQ,cAAc;IAC1C,IAAI,IAAI,OAAO,CAAC,cAAc,CAAC;IAQ/B,UAAU,CAAC,MAAM,EAAE,MAAM,GAAG,OAAO,CAAC,kBAAkB,CAAC;IAI7D,IAAI,uBAAuB,IAAI,MAAM,CAEpC;IAED,IAAI,eAAe,IAAI,QAAQ,CAK9B;IAED,IAAI,WAAW,IAAI,MAAM,CAExB;CACF;AAED,qBAAa,kBAAmB,SAAQ,WAAW;IAErC,OAAO,CAAC,QAAQ,CAAC,OAAO;IADpC,OAAO,CAAC,MAAM,CAAS;gBACM,OAAO,EAAE,cAAc,EAAE,MAAM,EAAE,YAAY,GAAG,MAAM,EAAE,QAAQ,EAAE,YAAY,GAAG,MAAM;IAIpH,aAAa,IAAI,IAAI;IAKrB,aAAa,CAAC,aAAa,EAAE,MAAM,GAAG,IAAI;IAK1C;;;;OAIG;IACG,QAAQ,CAAC,OAAO,CAAC,EAAE,OAAO,GAAG,OAAO,CAAC,iBAAiB,CAAC;CAQ9D"}
\ No newline at end of file
diff --git a/packages/js/dist/account/account-manager.js b/packages/js/dist/account/account-manager.js
index c15230bd..6a2ff7b2 100644
--- a/packages/js/dist/account/account-manager.js
+++ b/packages/js/dist/account/account-manager.js
@@ -23,7 +23,7 @@ var __importStar = (this && this.__importStar) || function (mod) {
     return result;
 };
 Object.defineProperty(exports, "__esModule", { value: true });
-exports.ManagedTransaction = exports.SandboxManager = exports.TestnetManager = exports.AccountManager = void 0;
+exports.ManagedTransaction = exports.SandboxManager = exports.TestnetManager = exports.CustomnetManager = exports.AccountManager = void 0;
 const path = __importStar(require("path"));
 const process = __importStar(require("process"));
 const nearAPI = __importStar(require("near-api-js"));
@@ -48,7 +48,9 @@ class AccountManager {
                 return new SandboxManager(config);
             case 'testnet':
                 return new TestnetManager(config);
-            default: throw new Error(`Bad network id: "${network}"; expected "testnet" or "sandbox"`);
+            case 'custom':
+                return new CustomnetManager(config);
+            default: throw new Error(`Bad network id: "${network}"; expected "testnet", "custom" or "sandbox"`);
         }
     }
     async accountView(accountId) {
@@ -204,6 +206,27 @@ class AccountManager {
     }
 }
 exports.AccountManager = AccountManager;
+class CustomnetManager extends AccountManager {
+    get DEFAULT_INITIAL_BALANCE() {
+        return near_units_1.NEAR.parse('10 N').toJSON();
+    }
+    get defaultKeyStore() {
+        return new nearAPI.keyStores.InMemoryKeyStore();
+    }
+    get connection() {
+        return new nearAPI.Connection(this.networkId, this.provider, this.signer, `jsvm.${this.networkId}`);
+    }
+    get networkId() {
+        return this.config.network;
+    }
+    async init() {
+        return this;
+    }
+    async createFrom(config) {
+        return new CustomnetManager(config);
+    }
+}
+exports.CustomnetManager = CustomnetManager;
 class TestnetManager extends AccountManager {
     static get defaultKeyStore() {
         const keyStore = new nearAPI.keyStores.UnencryptedFileSystemKeyStore(this.KEYSTORE_PATH);
diff --git a/packages/js/dist/account/account-manager.js.map b/packages/js/dist/account/account-manager.js.map
index 23c39fb9..d546c744 100644
--- a/packages/js/dist/account/account-manager.js.map
+++ b/packages/js/dist/account/account-manager.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/packages/js/dist/account/index.js b/packages/js/dist/account/index.js
index fac830ac..5241593f 100644
--- a/packages/js/dist/account/index.js
+++ b/packages/js/dist/account/index.js
@@ -1,7 +1,11 @@
 "use strict";
 var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
     if (k2 === undefined) k2 = k;
-    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+    var desc = Object.getOwnPropertyDescriptor(m, k);
+    if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
+      desc = { enumerable: true, get: function() { return m[k]; } };
+    }
+    Object.defineProperty(o, k2, desc);
 }) : (function(o, m, k, k2) {
     if (k2 === undefined) k2 = k;
     o[k2] = m[k];
diff --git a/packages/js/dist/account/index.js.map b/packages/js/dist/account/index.js.map
index a6b16130..7367f83f 100644
--- a/packages/js/dist/account/index.js.map
+++ b/packages/js/dist/account/index.js.map
@@ -1 +1 @@
-{"version":3,"file":"index.js","sourceRoot":"","sources":["../../src/account/index.ts"],"names":[],"mappings":";;;;;;;;;;;;AAAA,iDAA+B;AAC/B,yDAAuC;AACvC,oDAAkC;AAClC,4CAA0B"}
\ No newline at end of file
+{"version":3,"file":"index.js","sourceRoot":"","sources":["../../src/account/index.ts"],"names":[],"mappings":";;;;;;;;;;;;;;;;AAAA,iDAA+B;AAC/B,yDAAuC;AACvC,oDAAkC;AAClC,4CAA0B"}
\ No newline at end of file
diff --git a/packages/js/dist/utils.d.ts b/packages/js/dist/utils.d.ts
index baaad9a0..4bee558a 100644
--- a/packages/js/dist/utils.d.ts
+++ b/packages/js/dist/utils.d.ts
@@ -13,6 +13,7 @@ export declare function captureError(fn: () => Promise<any>): Promise<string>;
 export declare function isTopLevelAccount(accountId: string): boolean;
 export declare function urlConfigFromNetwork(network: string | {
     network: string;
+    rpcAddr?: string;
 }): ClientConfig;
 /**
  *
diff --git a/packages/js/dist/utils.d.ts.map b/packages/js/dist/utils.d.ts.map
index b4a8b579..287d7ae6 100644
--- a/packages/js/dist/utils.d.ts.map
+++ b/packages/js/dist/utils.d.ts.map
@@ -1 +1 @@
-{"version":3,"file":"utils.d.ts","sourceRoot":"","sources":["../src/utils.ts"],"names":[],"mappings":";AAAA,OAAO,EAAC,MAAM,EAAC,MAAM,QAAQ,CAAC;AAO9B,OAAO,EAAC,GAAG,EAAE,IAAI,EAAC,MAAM,YAAY,CAAC;AACrC,OAAO,EAAC,YAAY,EAAE,OAAO,EAAE,YAAY,EAAE,QAAQ,EAAE,EAAE,EAAC,MAAM,SAAS,CAAC;AAE1E,eAAO,MAAM,QAAQ,MAAmB,CAAC;AAEzC,wBAAgB,OAAO,CAAC,MAAM,EAAE,MAAM,GAAG,MAAM,CAE9C;AAED,wBAAgB,aAAa,IAAI,OAAO,CAEvC;AAED,wBAAgB,IAAI,CAAC,CAAC,EAAE,MAAM,GAAG,MAAM,UAQtC;AAGD,wBAAgB,eAAe,CAAC,MAAM,SAAS,EAAE,UAAU,SAAK,EAAE,YAAY,SAAK,GAAG,MAAM,CAG3F;AAED,wBAAgB,IAAI,CAAC,EAAE,EAAE,MAAM,GAAG,YAAY,GAAG,MAAM,CAEtD;AAED,eAAO,MAAM,UAAU,MAAe,CAAC;AAEvC,wBAAsB,YAAY,CAAC,EAAE,EAAE,MAAM,OAAO,CAAC,GAAG,CAAC,GAAG,OAAO,CAAC,MAAM,CAAC,CAU1E;AAED,wBAAgB,iBAAiB,CAAC,SAAS,EAAE,MAAM,GAAG,OAAO,CAE5D;AAsBD,wBAAgB,oBAAoB,CAAC,OAAO,EAAE,MAAM,GAAG;IAAC,OAAO,EAAE,MAAM,CAAA;CAAC,GAAG,YAAY,CAetF;AAED;;;;GAIG;AACH,wBAAgB,YAAY,CAAC,QAAQ,EAAE,MAAM,GAAG,MAAM,GAAG,MAAM,CAI9D;AAED,eAAO,MAAM,mBAAmB,qCAAqC,CAAC;AAEtE;;;GAGG;AACH,wBAAgB,iBAAiB,IAAI,SAAS,GAAG,SAAS,GAAG,QAAQ,CAepE;AAED,wBAAgB,YAAY,IAAI,QAAQ,CAIvC;AAED,wBAAgB,UAAU,CAAC,MAAM,EAAE,MAAM,EAAE,MAAM,SAAI,GAAG,MAAM,CAE7D;AAID,wBAAgB,QAAQ,CAAC,CAAC,EAAE,MAAM,GAAG,EAAE,GAAG,GAAG,CAM5C;AAID,wBAAgB,SAAS,CAAC,CAAC,EAAE,MAAM,GAAG,EAAE,GAAG,IAAI,CAM9C"}
\ No newline at end of file
+{"version":3,"file":"utils.d.ts","sourceRoot":"","sources":["../src/utils.ts"],"names":[],"mappings":";AAAA,OAAO,EAAC,MAAM,EAAC,MAAM,QAAQ,CAAC;AAO9B,OAAO,EAAC,GAAG,EAAE,IAAI,EAAC,MAAM,YAAY,CAAC;AACrC,OAAO,EAAC,YAAY,EAAE,OAAO,EAAE,YAAY,EAAE,QAAQ,EAAE,EAAE,EAAC,MAAM,SAAS,CAAC;AAE1E,eAAO,MAAM,QAAQ,MAAmB,CAAC;AAEzC,wBAAgB,OAAO,CAAC,MAAM,EAAE,MAAM,GAAG,MAAM,CAE9C;AAED,wBAAgB,aAAa,IAAI,OAAO,CAEvC;AAED,wBAAgB,IAAI,CAAC,CAAC,EAAE,MAAM,GAAG,MAAM,UAQtC;AAGD,wBAAgB,eAAe,CAAC,MAAM,SAAS,EAAE,UAAU,SAAK,EAAE,YAAY,SAAK,GAAG,MAAM,CAG3F;AAED,wBAAgB,IAAI,CAAC,EAAE,EAAE,MAAM,GAAG,YAAY,GAAG,MAAM,CAEtD;AAED,eAAO,MAAM,UAAU,MAAe,CAAC;AAEvC,wBAAsB,YAAY,CAAC,EAAE,EAAE,MAAM,OAAO,CAAC,GAAG,CAAC,GAAG,OAAO,CAAC,MAAM,CAAC,CAU1E;AAED,wBAAgB,iBAAiB,CAAC,SAAS,EAAE,MAAM,GAAG,OAAO,CAE5D;AAoBD,wBAAgB,oBAAoB,CAAC,OAAO,EAAE,MAAM,GAAG;IAAC,OAAO,EAAE,MAAM,CAAC;IAAC,OAAO,CAAC,EAAE,MAAM,CAAA;CAAC,GAAG,YAAY,CAqBxG;AAED;;;;GAIG;AACH,wBAAgB,YAAY,CAAC,QAAQ,EAAE,MAAM,GAAG,MAAM,GAAG,MAAM,CAI9D;AAED,eAAO,MAAM,mBAAmB,qCAAqC,CAAC;AAEtE;;;GAGG;AACH,wBAAgB,iBAAiB,IAAI,SAAS,GAAG,SAAS,GAAG,QAAQ,CAepE;AAED,wBAAgB,YAAY,IAAI,QAAQ,CAIvC;AAED,wBAAgB,UAAU,CAAC,MAAM,EAAE,MAAM,EAAE,MAAM,SAAI,GAAG,MAAM,CAE7D;AAID,wBAAgB,QAAQ,CAAC,CAAC,EAAE,MAAM,GAAG,EAAE,GAAG,GAAG,CAM5C;AAID,wBAAgB,SAAS,CAAC,CAAC,EAAE,MAAM,GAAG,EAAE,GAAG,IAAI,CAM9C"}
\ No newline at end of file
diff --git a/packages/js/dist/utils.js b/packages/js/dist/utils.js
index 03863c73..1a468567 100644
--- a/packages/js/dist/utils.js
+++ b/packages/js/dist/utils.js
@@ -86,9 +86,6 @@ function configFromDomain(network) {
     else if (network === 'testnet' && process.env.NEAR_CLI_TESTNET_RPC_SERVER_URL) {
         rpcAddr = process.env.NEAR_CLI_TESTNET_RPC_SERVER_URL;
     }
-    else if (network === 'custom' && process.env.NEAR_CLI_CUSTOM_RPC_SERVER_URL) {
-        rpcAddr = process.env.NEAR_CLI_CUSTOM_RPC_SERVER_URL;
-    }
     return {
         network,
         rpcAddr,
@@ -100,15 +97,20 @@ function configFromDomain(network) {
 }
 function urlConfigFromNetwork(network) {
     const networkName = typeof network === 'string' ? network : network.network;
+    const rpcAddr = typeof network === 'string' ? undefined : network.rpcAddr;
     switch (networkName) {
         case 'sandbox':
             return {
                 network: 'sandbox',
                 rpcAddr: 'http://localhost',
             };
+        case 'custom':
+            return {
+                network: 'custom',
+                rpcAddr: rpcAddr,
+            };
         case 'testnet':
-        case 'mainnet':
-        case 'custom': return configFromDomain(networkName);
+        case 'mainnet': return configFromDomain(networkName);
         default:
             throw new Error(`Got network ${networkName}, but only accept 'sandbox', 'testnet', 'mainnet' and 'custom'`);
     }
diff --git a/packages/js/dist/utils.js.map b/packages/js/dist/utils.js.map
index b3134aa9..a760197b 100644
--- a/packages/js/dist/utils.js.map
+++ b/packages/js/dist/utils.js.map
@@ -1 +1 @@
-{"version":3,"file":"utils.js","sourceRoot":"","sources":["../src/utils.ts"],"names":[],"mappings":";;;;;;;;;;;;;;;;;;;;;;;;;;;;;AAAA,mCAA8B;AAC9B,iDAAmC;AACnC,uCAAyB;AACzB,2CAA6B;AAC7B,qDAAuC;AACvC,0DAA+B;AAC/B,gDAAwB;AACxB,2CAAqC;AAGxB,QAAA,QAAQ,GAAG,iBAAI,CAAC,KAAK,CAAC,IAAI,CAAC,CAAC;AAEzC,SAAgB,OAAO,CAAC,MAAc;IACpC,OAAO,iBAAI,CAAC,KAAK,CAAC,GAAG,MAAM,GAAG,CAAC,CAAC,QAAQ,EAAE,CAAC;AAC7C,CAAC;AAFD,0BAEC;AAED,SAAgB,aAAa;IAC3B,OAAO,OAAO,CAAC,KAAK,CAAC,cAAc,CAAC,UAAU,EAAE,CAAC;AACnD,CAAC;AAFD,sCAEC;AAED,SAAgB,IAAI,CAAC,CAAkB;IACrC,IAAI,OAAO,CAAC,KAAK,QAAQ,IAAI,MAAM,CAAC,KAAK,CAAC,MAAM,CAAC,QAAQ,CAAC,CAAC,EAAE,EAAE,CAAC,CAAC,EAAE;QACjE,MAAM,IAAI,SAAS,CACjB,uDAAuD,CAAC,EAAE,CAC3D,CAAC;KACH;IAED,OAAO,MAAM,CAAC,CAAC,CAAC,GAAG,GAAG,CAAC,MAAM,CAAC,EAAE,CAAC,CAAC;AACpC,CAAC;AARD,oBAQC;AAED,2DAA2D;AAC3D,SAAgB,eAAe,CAAC,MAAM,GAAG,MAAM,EAAE,UAAU,GAAG,EAAE,EAAE,YAAY,GAAG,EAAE;IACjF,MAAM,MAAM,GAAG,IAAI,CAAC,KAAK,CAAC,IAAI,CAAC,MAAM,EAAE,GAAG,CAAC,EAAE,IAAI,EAAE,CAAC,CAAC,GAAG,CAAC,EAAE,IAAI,YAAY,CAAC,CAAC;IAC7E,OAAO,GAAG,UAAU,CAAC,MAAM,EAAE,UAAU,CAAC,IAAI,MAAM,EAAE,CAAC;AACvD,CAAC;AAHD,0CAGC;AAED,SAAgB,IAAI,CAAC,EAAyB;IAC5C,OAAO,OAAO,EAAE,KAAK,QAAQ,CAAC,CAAC,CAAC,EAAE,CAAC,CAAC,CAAC,EAAE,CAAC,SAAS,CAAC;AACpD,CAAC;AAFD,oBAEC;AAEY,QAAA,UAAU,GAAG,iBAAI,CAAC,IAAI,CAAC,CAAC,CAAC,CAAC;AAEhC,KAAK,UAAU,YAAY,CAAC,EAAsB;IACvD,IAAI;QACF,MAAM,EAAE,EAAE,CAAC;KACZ;IAAC,OAAO,KAAc,EAAE;QACvB,IAAI,KAAK,YAAY,KAAK,EAAE;YAC1B,OAAO,KAAK,CAAC,OAAO,CAAC;SACtB;KACF;IAED,MAAM,IAAI,KAAK,CAAC,kDAAkD,CAAC,CAAC;AACtE,CAAC;AAVD,oCAUC;AAED,SAAgB,iBAAiB,CAAC,SAAiB;IACjD,OAAO,CAAC,SAAS,CAAC,QAAQ,CAAC,GAAG,CAAC,CAAC;AAClC,CAAC;AAFD,8CAEC;AAED,SAAS,gBAAgB,CAAC,OAAyC;IACjE,IAAI,OAAO,GAAG,wBAAwB,OAAO,WAAW,CAAC;IACzD,IAAI,OAAO,KAAK,SAAS,IAAI,OAAO,CAAC,GAAG,CAAC,+BAA+B,EAAE;QACxE,OAAO,GAAG,OAAO,CAAC,GAAG,CAAC,+BAA+B,CAAC;KACvD;SAAM,IAAI,OAAO,KAAK,SAAS,IAAI,OAAO,CAAC,GAAG,CAAC,+BAA+B,EAAE;QAC/E,OAAO,GAAG,OAAO,CAAC,GAAG,CAAC,+BAA+B,CAAC;KACvD;SAAM,IAAI,OAAO,KAAK,QAAQ,IAAI,OAAO,CAAC,GAAG,CAAC,8BAA8B,EAAE;QAC7E,OAAO,GAAG,OAAO,CAAC,GAAG,CAAC,8BAA8B,CAAC;KACtD;IAED,OAAO;QACL,OAAO;QACP,OAAO;QACP,SAAS,EAAE,kBAAkB,OAAO,WAAW;QAC/C,SAAS,EAAE,kBAAkB,OAAO,WAAW;QAC/C,WAAW,EAAE,oBAAoB,OAAO,WAAW;QACnD,WAAW,EAAE,wBAAwB,OAAO,WAAW;KACxD,CAAC;AACJ,CAAC;AAED,SAAgB,oBAAoB,CAAC,OAAmC;IACtE,MAAM,WAAW,GAAG,OAAO,OAAO,KAAK,QAAQ,CAAC,CAAC,CAAC,OAAO,CAAC,CAAC,CAAC,OAAO,CAAC,OAAO,CAAC;IAC5E,QAAQ,WAAW,EAAE;QACnB,KAAK,SAAS;YACZ,OAAO;gBACL,OAAO,EAAE,SAAS;gBAClB,OAAO,EAAE,kBAAkB;aAC5B,CAAC;QAEJ,KAAK,SAAS,CAAC;QACf,KAAK,SAAS,CAAC;QACf,KAAK,QAAQ,CAAC,CAAC,OAAO,gBAAgB,CAAC,WAAW,CAAC,CAAC;QACpD;YACE,MAAM,IAAI,KAAK,CAAC,eAAe,WAAW,gEAAgE,CAAC,CAAC;KAC/G;AACH,CAAC;AAfD,oDAeC;AAED;;;;GAIG;AACH,SAAgB,YAAY,CAAC,QAAyB;IACpD,MAAM,KAAK,GAAG,OAAO,QAAQ,KAAK,QAAQ,CAAC,CAAC,CAAC,eAAM,CAAC,IAAI,CAAC,QAAQ,EAAE,QAAQ,CAAC,CAAC,CAAC,CAAC,QAAQ,CAAC;IACxF,MAAM,MAAM,GAAG,eAAM,CAAC,IAAI,CAAC,mBAAM,CAAC,MAAM,CAAC,KAAK,CAAC,EAAE,KAAK,CAAC,CAAC;IACxD,OAAO,cAAI,CAAC,MAAM,CAAC,MAAM,CAAC,CAAC;AAC7B,CAAC;AAJD,oCAIC;AAEY,QAAA,mBAAmB,GAAG,kCAAkC,CAAC;AAEtE;;;GAGG;AACH,SAAgB,iBAAiB;IAC/B,MAAM,OAAO,GAAG,OAAO,CAAC,GAAG,CAAC,uBAAuB,CAAC;IACpD,QAAQ,OAAO,EAAE;QACf,KAAK,SAAS,CAAC;QACf,KAAK,SAAS,CAAC;QACf,KAAK,QAAQ;YACX,OAAO,OAAO,CAAC;QACjB,KAAK,SAAS;YACZ,OAAO,SAAS,CAAC;QACnB;YACE,MAAM,IAAI,KAAK,CACb,gDAAgD,OAAO,YAAY;kBACjE,2DAA2D,CAC9D,CAAC;KACL;AACH,CAAC;AAfD,8CAeC;AAED,SAAgB,YAAY;IAC1B,OAAO,IAAI,OAAO,CAAC,SAAS,CAAC,6BAA6B,CACxD,IAAI,CAAC,IAAI,CAAC,EAAE,CAAC,OAAO,EAAE,EAAE,mBAAmB,CAAC,CAC7C,CAAC;AACJ,CAAC;AAJD,oCAIC;AAED,SAAgB,UAAU,CAAC,MAAc,EAAE,MAAM,GAAG,CAAC;IACnD,OAAO,GAAG,MAAM,GAAG,IAAI,CAAC,GAAG,EAAE,GAAG,CAAC,EAAE,IAAI,MAAM,CAAC,EAAE,CAAC;AACnD,CAAC;AAFD,gCAEC;AAED,MAAM,uBAAuB,GAAG,QAAQ,CAAC;AAEzC,SAAgB,QAAQ,CAAC,CAAc;IACrC,IAAI,OAAO,CAAC,KAAK,QAAQ,IAAI,uBAAuB,CAAC,IAAI,CAAC,CAAC,CAAC,EAAE;QAC5D,OAAO,gBAAG,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC;KACrB;IAED,OAAO,gBAAG,CAAC,IAAI,CAAC,CAAC,CAAC,CAAC;AACrB,CAAC;AAND,4BAMC;AAED,4FAA4F;AAC5F,cAAc;AACd,SAAgB,SAAS,CAAC,CAAc;IACtC,IAAI,OAAO,CAAC,KAAK,QAAQ,IAAI,uBAAuB,CAAC,IAAI,CAAC,CAAC,CAAC,EAAE;QAC5D,OAAO,iBAAI,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC;KACtB;IAED,OAAO,iBAAI,CAAC,IAAI,CAAC,CAAC,CAAC,CAAC;AACtB,CAAC;AAND,8BAMC"}
\ No newline at end of file
+{"version":3,"file":"utils.js","sourceRoot":"","sources":["../src/utils.ts"],"names":[],"mappings":";;;;;;;;;;;;;;;;;;;;;;;;;;;;;AAAA,mCAA8B;AAC9B,iDAAmC;AACnC,uCAAyB;AACzB,2CAA6B;AAC7B,qDAAuC;AACvC,0DAA+B;AAC/B,gDAAwB;AACxB,2CAAqC;AAGxB,QAAA,QAAQ,GAAG,iBAAI,CAAC,KAAK,CAAC,IAAI,CAAC,CAAC;AAEzC,SAAgB,OAAO,CAAC,MAAc;IACpC,OAAO,iBAAI,CAAC,KAAK,CAAC,GAAG,MAAM,GAAG,CAAC,CAAC,QAAQ,EAAE,CAAC;AAC7C,CAAC;AAFD,0BAEC;AAED,SAAgB,aAAa;IAC3B,OAAO,OAAO,CAAC,KAAK,CAAC,cAAc,CAAC,UAAU,EAAE,CAAC;AACnD,CAAC;AAFD,sCAEC;AAED,SAAgB,IAAI,CAAC,CAAkB;IACrC,IAAI,OAAO,CAAC,KAAK,QAAQ,IAAI,MAAM,CAAC,KAAK,CAAC,MAAM,CAAC,QAAQ,CAAC,CAAC,EAAE,EAAE,CAAC,CAAC,EAAE;QACjE,MAAM,IAAI,SAAS,CACjB,uDAAuD,CAAC,EAAE,CAC3D,CAAC;KACH;IAED,OAAO,MAAM,CAAC,CAAC,CAAC,GAAG,GAAG,CAAC,MAAM,CAAC,EAAE,CAAC,CAAC;AACpC,CAAC;AARD,oBAQC;AAED,2DAA2D;AAC3D,SAAgB,eAAe,CAAC,MAAM,GAAG,MAAM,EAAE,UAAU,GAAG,EAAE,EAAE,YAAY,GAAG,EAAE;IACjF,MAAM,MAAM,GAAG,IAAI,CAAC,KAAK,CAAC,IAAI,CAAC,MAAM,EAAE,GAAG,CAAC,EAAE,IAAI,EAAE,CAAC,CAAC,GAAG,CAAC,EAAE,IAAI,YAAY,CAAC,CAAC;IAC7E,OAAO,GAAG,UAAU,CAAC,MAAM,EAAE,UAAU,CAAC,IAAI,MAAM,EAAE,CAAC;AACvD,CAAC;AAHD,0CAGC;AAED,SAAgB,IAAI,CAAC,EAAyB;IAC5C,OAAO,OAAO,EAAE,KAAK,QAAQ,CAAC,CAAC,CAAC,EAAE,CAAC,CAAC,CAAC,EAAE,CAAC,SAAS,CAAC;AACpD,CAAC;AAFD,oBAEC;AAEY,QAAA,UAAU,GAAG,iBAAI,CAAC,IAAI,CAAC,CAAC,CAAC,CAAC;AAEhC,KAAK,UAAU,YAAY,CAAC,EAAsB;IACvD,IAAI;QACF,MAAM,EAAE,EAAE,CAAC;KACZ;IAAC,OAAO,KAAc,EAAE;QACvB,IAAI,KAAK,YAAY,KAAK,EAAE;YAC1B,OAAO,KAAK,CAAC,OAAO,CAAC;SACtB;KACF;IAED,MAAM,IAAI,KAAK,CAAC,kDAAkD,CAAC,CAAC;AACtE,CAAC;AAVD,oCAUC;AAED,SAAgB,iBAAiB,CAAC,SAAiB;IACjD,OAAO,CAAC,SAAS,CAAC,QAAQ,CAAC,GAAG,CAAC,CAAC;AAClC,CAAC;AAFD,8CAEC;AAED,SAAS,gBAAgB,CAAC,OAAyC;IACjE,IAAI,OAAO,GAAG,wBAAwB,OAAO,WAAW,CAAC;IACzD,IAAI,OAAO,KAAK,SAAS,IAAI,OAAO,CAAC,GAAG,CAAC,+BAA+B,EAAE;QACxE,OAAO,GAAG,OAAO,CAAC,GAAG,CAAC,+BAA+B,CAAC;KACvD;SAAM,IAAI,OAAO,KAAK,SAAS,IAAI,OAAO,CAAC,GAAG,CAAC,+BAA+B,EAAE;QAC/E,OAAO,GAAG,OAAO,CAAC,GAAG,CAAC,+BAA+B,CAAC;KACvD;IAED,OAAO;QACL,OAAO;QACP,OAAO;QACP,SAAS,EAAE,kBAAkB,OAAO,WAAW;QAC/C,SAAS,EAAE,kBAAkB,OAAO,WAAW;QAC/C,WAAW,EAAE,oBAAoB,OAAO,WAAW;QACnD,WAAW,EAAE,wBAAwB,OAAO,WAAW;KACxD,CAAC;AACJ,CAAC;AAED,SAAgB,oBAAoB,CAAC,OAAqD;IACxF,MAAM,WAAW,GAAG,OAAO,OAAO,KAAK,QAAQ,CAAC,CAAC,CAAC,OAAO,CAAC,CAAC,CAAC,OAAO,CAAC,OAAO,CAAC;IAC5E,MAAM,OAAO,GAAG,OAAO,OAAO,KAAK,QAAQ,CAAC,CAAC,CAAC,SAAS,CAAC,CAAC,CAAC,OAAO,CAAC,OAAO,CAAC;IAC1E,QAAQ,WAAW,EAAE;QACnB,KAAK,SAAS;YACZ,OAAO;gBACL,OAAO,EAAE,SAAS;gBAClB,OAAO,EAAE,kBAAkB;aAC5B,CAAC;QAEJ,KAAK,QAAQ;YACX,OAAO;gBACL,OAAO,EAAE,QAAQ;gBACjB,OAAO,EAAE,OAAQ;aAClB,CAAC;QAEJ,KAAK,SAAS,CAAC;QACf,KAAK,SAAS,CAAC,CAAC,OAAO,gBAAgB,CAAC,WAAW,CAAC,CAAC;QACrD;YACE,MAAM,IAAI,KAAK,CAAC,eAAe,WAAW,gEAAgE,CAAC,CAAC;KAC/G;AACH,CAAC;AArBD,oDAqBC;AAED;;;;GAIG;AACH,SAAgB,YAAY,CAAC,QAAyB;IACpD,MAAM,KAAK,GAAG,OAAO,QAAQ,KAAK,QAAQ,CAAC,CAAC,CAAC,eAAM,CAAC,IAAI,CAAC,QAAQ,EAAE,QAAQ,CAAC,CAAC,CAAC,CAAC,QAAQ,CAAC;IACxF,MAAM,MAAM,GAAG,eAAM,CAAC,IAAI,CAAC,mBAAM,CAAC,MAAM,CAAC,KAAK,CAAC,EAAE,KAAK,CAAC,CAAC;IACxD,OAAO,cAAI,CAAC,MAAM,CAAC,MAAM,CAAC,CAAC;AAC7B,CAAC;AAJD,oCAIC;AAEY,QAAA,mBAAmB,GAAG,kCAAkC,CAAC;AAEtE;;;GAGG;AACH,SAAgB,iBAAiB;IAC/B,MAAM,OAAO,GAAG,OAAO,CAAC,GAAG,CAAC,uBAAuB,CAAC;IACpD,QAAQ,OAAO,EAAE;QACf,KAAK,SAAS,CAAC;QACf,KAAK,SAAS,CAAC;QACf,KAAK,QAAQ;YACX,OAAO,OAAO,CAAC;QACjB,KAAK,SAAS;YACZ,OAAO,SAAS,CAAC;QACnB;YACE,MAAM,IAAI,KAAK,CACb,gDAAgD,OAAO,YAAY;kBACjE,2DAA2D,CAC9D,CAAC;KACL;AACH,CAAC;AAfD,8CAeC;AAED,SAAgB,YAAY;IAC1B,OAAO,IAAI,OAAO,CAAC,SAAS,CAAC,6BAA6B,CACxD,IAAI,CAAC,IAAI,CAAC,EAAE,CAAC,OAAO,EAAE,EAAE,mBAAmB,CAAC,CAC7C,CAAC;AACJ,CAAC;AAJD,oCAIC;AAED,SAAgB,UAAU,CAAC,MAAc,EAAE,MAAM,GAAG,CAAC;IACnD,OAAO,GAAG,MAAM,GAAG,IAAI,CAAC,GAAG,EAAE,GAAG,CAAC,EAAE,IAAI,MAAM,CAAC,EAAE,CAAC;AACnD,CAAC;AAFD,gCAEC;AAED,MAAM,uBAAuB,GAAG,QAAQ,CAAC;AAEzC,SAAgB,QAAQ,CAAC,CAAc;IACrC,IAAI,OAAO,CAAC,KAAK,QAAQ,IAAI,uBAAuB,CAAC,IAAI,CAAC,CAAC,CAAC,EAAE;QAC5D,OAAO,gBAAG,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC;KACrB;IAED,OAAO,gBAAG,CAAC,IAAI,CAAC,CAAC,CAAC,CAAC;AACrB,CAAC;AAND,4BAMC;AAED,4FAA4F;AAC5F,cAAc;AACd,SAAgB,SAAS,CAAC,CAAc;IACtC,IAAI,OAAO,CAAC,KAAK,QAAQ,IAAI,uBAAuB,CAAC,IAAI,CAAC,CAAC,CAAC,EAAE;QAC5D,OAAO,iBAAI,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC;KACtB;IAED,OAAO,iBAAI,CAAC,IAAI,CAAC,CAAC,CAAC,CAAC;AACtB,CAAC;AAND,8BAMC"}
\ No newline at end of file
diff --git a/packages/js/dist/worker.d.ts b/packages/js/dist/worker.d.ts
index bdb0be03..378cd311 100644
--- a/packages/js/dist/worker.d.ts
+++ b/packages/js/dist/worker.d.ts
@@ -28,11 +28,11 @@ export declare abstract class Worker {
     abstract tearDown(): Promise<void>;
 }
 export declare class CustomnetWorker extends Worker {
+    private readonly clientConfig;
     static init(config: Partial<Config>): Promise<CustomnetWorker>;
     get provider(): JsonRpcProvider;
     tearDown(): Promise<void>;
-    static get defaultConfig(): Config;
-    private static get clientConfig();
+    get defaultConfig(): Config;
 }
 export declare class TestnetWorker extends Worker {
     static init(config: Partial<Config>): Promise<TestnetWorker>;
diff --git a/packages/js/dist/worker.d.ts.map b/packages/js/dist/worker.d.ts.map
index 8a79da2a..e59a7ca3 100644
--- a/packages/js/dist/worker.d.ts.map
+++ b/packages/js/dist/worker.d.ts.map
@@ -1 +1 @@
-{"version":3,"file":"worker.d.ts","sourceRoot":"","sources":["../src/worker.ts"],"names":[],"mappings":"AAIA,OAAO,EAAC,MAAM,EAAe,MAAM,SAAS,CAAC;AAC7C,OAAO,EAAiB,WAAW,EAAE,kBAAkB,EAAC,MAAM,WAAW,CAAC;AAC1E,OAAO,EAAC,eAAe,EAAC,MAAM,WAAW,CAAC;AAI1C;;GAEG;AACH,8BAAsB,MAAM;IAC1B,SAAS,CAAC,MAAM,EAAE,MAAM,CAAC;IAEzB,SAAS,CAAC,OAAO,EAAG,kBAAkB,CAAC;gBAE3B,MAAM,EAAE,MAAM;IAM1B;;;;;;;;;;;;;OAaG;WACU,IAAI,CAAC,MAAM,GAAE,OAAO,CAAC,MAAM,CAAM,GAAG,OAAO,CAAC,MAAM,CAAC;IAiBhE,IAAI,WAAW,IAAI,WAAW,CAE7B;IAED,QAAQ,KAAK,QAAQ,IAAI,eAAe,CAAC;IAEzC,QAAQ,CAAC,QAAQ,IAAI,OAAO,CAAC,IAAI,CAAC;CACnC;AAID,qBAAa,eAAgB,SAAQ,MAAM;WAC5B,IAAI,CAAC,MAAM,EAAE,OAAO,CAAC,MAAM,CAAC,GAAG,OAAO,CAAC,eAAe,CAAC;IAQpE,IAAI,QAAQ,IAAI,eAAe,CAE9B;IAEK,QAAQ,IAAI,OAAO,CAAC,IAAI,CAAC;IAK/B,MAAM,KAAK,aAAa,IAAI,MAAM,CAQjC;IAED,OAAO,CAAC,MAAM,KAAK,YAAY,GAE9B;CACF;AAED,qBAAa,aAAc,SAAQ,MAAM;WAC1B,IAAI,CAAC,MAAM,EAAE,OAAO,CAAC,MAAM,CAAC,GAAG,OAAO,CAAC,aAAa,CAAC;IAQlE,IAAI,QAAQ,IAAI,eAAe,CAE9B;IAEK,QAAQ,IAAI,OAAO,CAAC,IAAI,CAAC;IAK/B,MAAM,KAAK,aAAa,IAAI,MAAM,CAQjC;IAED,OAAO,CAAC,MAAM,KAAK,YAAY,GAE9B;CACF;AAED,qBAAa,aAAc,SAAQ,MAAM;IACvC,OAAO,CAAC,MAAM,CAAiB;WAElB,IAAI,CAAC,MAAM,EAAE,OAAO,CAAC,MAAM,CAAC,GAAG,OAAO,CAAC,aAAa,CAAC;WAgCrD,aAAa,IAAI,OAAO,CAAC,MAAM,CAAC;IAY7C,IAAI,QAAQ,IAAI,eAAe,CAE9B;IAEK,QAAQ,IAAI,OAAO,CAAC,IAAI,CAAC;IAQ/B,OAAO,CAAC,MAAM,KAAK,YAAY,GAO9B;IAED,OAAO,KAAK,OAAO,GAElB;CACF"}
\ No newline at end of file
+{"version":3,"file":"worker.d.ts","sourceRoot":"","sources":["../src/worker.ts"],"names":[],"mappings":"AAIA,OAAO,EAAC,MAAM,EAAe,MAAM,SAAS,CAAC;AAC7C,OAAO,EAAiB,WAAW,EAAE,kBAAkB,EAAC,MAAM,WAAW,CAAC;AAC1E,OAAO,EAAC,eAAe,EAAC,MAAM,WAAW,CAAC;AAM1C;;GAEG;AACH,8BAAsB,MAAM;IAC1B,SAAS,CAAC,MAAM,EAAE,MAAM,CAAC;IAEzB,SAAS,CAAC,OAAO,EAAG,kBAAkB,CAAC;gBAE3B,MAAM,EAAE,MAAM;IAM1B;;;;;;;;;;;;;OAaG;WACU,IAAI,CAAC,MAAM,GAAE,OAAO,CAAC,MAAM,CAAM,GAAG,OAAO,CAAC,MAAM,CAAC;IAiBhE,IAAI,WAAW,IAAI,WAAW,CAE7B;IAED,QAAQ,KAAK,QAAQ,IAAI,eAAe,CAAC;IAEzC,QAAQ,CAAC,QAAQ,IAAI,OAAO,CAAC,IAAI,CAAC;CACnC;AAID,qBAAa,eAAgB,SAAQ,MAAM;IACzC,OAAO,CAAC,QAAQ,CAAC,YAAY,CAAyF;WAEzG,IAAI,CAAC,MAAM,EAAE,OAAO,CAAC,MAAM,CAAC,GAAG,OAAO,CAAC,eAAe,CAAC;IAsBpE,IAAI,QAAQ,IAAI,eAAe,CAE9B;IAEK,QAAQ,IAAI,OAAO,CAAC,IAAI,CAAC;IAK/B,IAAI,aAAa,IAAI,MAAM,CAQ1B;CACF;AAED,qBAAa,aAAc,SAAQ,MAAM;WAC1B,IAAI,CAAC,MAAM,EAAE,OAAO,CAAC,MAAM,CAAC,GAAG,OAAO,CAAC,aAAa,CAAC;IAelE,IAAI,QAAQ,IAAI,eAAe,CAE9B;IAEK,QAAQ,IAAI,OAAO,CAAC,IAAI,CAAC;IAK/B,MAAM,KAAK,aAAa,IAAI,MAAM,CAQjC;IAED,OAAO,CAAC,MAAM,KAAK,YAAY,GAE9B;CACF;AAED,qBAAa,aAAc,SAAQ,MAAM;IACvC,OAAO,CAAC,MAAM,CAAiB;WAElB,IAAI,CAAC,MAAM,EAAE,OAAO,CAAC,MAAM,CAAC,GAAG,OAAO,CAAC,aAAa,CAAC;WAsCrD,aAAa,IAAI,OAAO,CAAC,MAAM,CAAC;IAY7C,IAAI,QAAQ,IAAI,eAAe,CAE9B;IAEK,QAAQ,IAAI,OAAO,CAAC,IAAI,CAAC;IAQ/B,OAAO,CAAC,MAAM,KAAK,YAAY,GAO9B;IAED,OAAO,KAAK,OAAO,GAElB;CACF"}
\ No newline at end of file
diff --git a/packages/js/dist/worker.js b/packages/js/dist/worker.js
index b5ff515c..6ca8cfa3 100644
--- a/packages/js/dist/worker.js
+++ b/packages/js/dist/worker.js
@@ -12,6 +12,7 @@ const account_1 = require("./account");
 const jsonrpc_1 = require("./jsonrpc");
 const internal_utils_1 = require("./internal-utils");
 const server_1 = require("./server/server");
+const API_KEY_HEADER = 'x-api-key';
 /**
  * The main interface to near-workspaces. Create a new worker instance with {@link Worker.init}, then run code on it.
  */
@@ -58,21 +59,37 @@ exports.Worker = Worker;
 // Connect to a custom network.
 // Note: the burden of ensuring the methods that are able to be called are left up to the user.
 class CustomnetWorker extends Worker {
+    constructor() {
+        super(...arguments);
+        this.clientConfig = (0, utils_1.urlConfigFromNetwork)({ network: 'custom', rpcAddr: this.config.rpcAddr });
+    }
     static async init(config) {
         (0, internal_utils_1.debug)('Lifecycle.CustomnetWorker.create()', 'config:', config);
-        const fullConfig = { ...this.defaultConfig, ...config };
+        const fullConfig = {
+            homeDir: 'ignored',
+            port: 3030,
+            rm: false,
+            refDir: null,
+            ...(0, utils_1.urlConfigFromNetwork)({ network: 'custom', rpcAddr: config.rpcAddr }),
+            ...config,
+        };
         const worker = new CustomnetWorker(fullConfig);
+        if (config.apiKey) {
+            worker.provider.connection.headers = {
+                ...worker.provider.connection.headers, [API_KEY_HEADER]: config.apiKey,
+            };
+        }
         await worker.manager.init();
         return worker;
     }
     get provider() {
-        return jsonrpc_1.JsonRpcProvider.from(CustomnetWorker.clientConfig);
+        return jsonrpc_1.JsonRpcProvider.from(this.clientConfig);
     }
     async tearDown() {
-        // We are not stopping any server here because we are using Testnet
+        // We are not stopping any server here because it is an external network.
         return Promise.resolve();
     }
-    static get defaultConfig() {
+    get defaultConfig() {
         return {
             homeDir: 'ignored',
             port: 3030,
@@ -81,9 +98,6 @@ class CustomnetWorker extends Worker {
             ...this.clientConfig,
         };
     }
-    static get clientConfig() {
-        return (0, utils_1.urlConfigFromNetwork)('custom');
-    }
 }
 exports.CustomnetWorker = CustomnetWorker;
 class TestnetWorker extends Worker {
@@ -91,6 +105,11 @@ class TestnetWorker extends Worker {
         (0, internal_utils_1.debug)('Lifecycle.TestnetWorker.create()', 'config:', config);
         const fullConfig = { ...this.defaultConfig, ...config };
         const worker = new TestnetWorker(fullConfig);
+        if (config.apiKey) {
+            worker.provider.connection.headers = {
+                ...worker.provider.connection.headers, [API_KEY_HEADER]: config.apiKey,
+            };
+        }
         await worker.manager.init();
         return worker;
     }
@@ -139,6 +158,11 @@ class SandboxWorker extends Worker {
         const release = await (0, proper_lockfile_1.lock)(syncFilename, retryOptions);
         const defaultConfig = await this.defaultConfig();
         const worker = new SandboxWorker({ ...defaultConfig, ...config });
+        if (config.apiKey) {
+            worker.provider.connection.headers = {
+                ...worker.provider.connection.headers, [API_KEY_HEADER]: config.apiKey,
+            };
+        }
         worker.server = await server_1.SandboxServer.init(worker.config);
         await worker.server.start();
         // Release file lock after near node start
diff --git a/packages/js/dist/worker.js.map b/packages/js/dist/worker.js.map
index a0451157..a5016dfd 100644
--- a/packages/js/dist/worker.js.map
+++ b/packages/js/dist/worker.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/packages/js/src/account/account-manager.ts b/packages/js/src/account/account-manager.ts
index 2cc9485e..0db38ac2 100644
--- a/packages/js/src/account/account-manager.ts
+++ b/packages/js/src/account/account-manager.ts
@@ -29,7 +29,9 @@ export abstract class AccountManager implements NearAccountManager {
         return new SandboxManager(config);
       case 'testnet':
         return new TestnetManager(config);
-      default: throw new Error(`Bad network id: "${network as string}"; expected "testnet" or "sandbox"`);
+      case 'custom':
+        return new CustomnetManager(config);
+      default: throw new Error(`Bad network id: "${network as string}"; expected "testnet", "custom" or "sandbox"`);
     }
   }
 
@@ -220,6 +222,32 @@ export abstract class AccountManager implements NearAccountManager {
   }
 }
 
+export class CustomnetManager extends AccountManager {
+  get DEFAULT_INITIAL_BALANCE(): string {
+    return NEAR.parse('10 N').toJSON();
+  }
+
+  get defaultKeyStore(): KeyStore {
+    return new nearAPI.keyStores.InMemoryKeyStore();
+  }
+
+  get connection(): nearAPI.Connection {
+    return new nearAPI.Connection(this.networkId, this.provider, this.signer, `jsvm.${this.networkId}`);
+  }
+
+  get networkId(): string {
+    return this.config.network;
+  }
+
+  async init(): Promise<AccountManager> {
+    return this;
+  }
+
+  async createFrom(config: Config): Promise<NearAccountManager> {
+    return new CustomnetManager(config);
+  }
+}
+
 export class TestnetManager extends AccountManager {
   static readonly KEYSTORE_PATH: string = path.join(process.cwd(), '.near-credentials', 'workspaces');
   private static numTestAccounts = 0;
diff --git a/packages/js/src/utils.ts b/packages/js/src/utils.ts
index 09c736eb..0949c251 100644
--- a/packages/js/src/utils.ts
+++ b/packages/js/src/utils.ts
@@ -62,8 +62,6 @@ function configFromDomain(network: 'testnet' | 'mainnet' | 'custom'): ClientConf
     rpcAddr = process.env.NEAR_CLI_MAINNET_RPC_SERVER_URL;
   } else if (network === 'testnet' && process.env.NEAR_CLI_TESTNET_RPC_SERVER_URL) {
     rpcAddr = process.env.NEAR_CLI_TESTNET_RPC_SERVER_URL;
-  } else if (network === 'custom' && process.env.NEAR_CLI_CUSTOM_RPC_SERVER_URL) {
-    rpcAddr = process.env.NEAR_CLI_CUSTOM_RPC_SERVER_URL;
   }
 
   return {
@@ -76,8 +74,9 @@ function configFromDomain(network: 'testnet' | 'mainnet' | 'custom'): ClientConf
   };
 }
 
-export function urlConfigFromNetwork(network: string | {network: string}): ClientConfig {
+export function urlConfigFromNetwork(network: string | {network: string; rpcAddr?: string}): ClientConfig {
   const networkName = typeof network === 'string' ? network : network.network;
+  const rpcAddr = typeof network === 'string' ? undefined : network.rpcAddr;
   switch (networkName) {
     case 'sandbox':
       return {
@@ -85,9 +84,14 @@ export function urlConfigFromNetwork(network: string | {network: string}): Clien
         rpcAddr: 'http://localhost',
       };
 
+    case 'custom':
+      return {
+        network: 'custom',
+        rpcAddr: rpcAddr!,
+      };
+
     case 'testnet':
-    case 'mainnet':
-    case 'custom': return configFromDomain(networkName);
+    case 'mainnet': return configFromDomain(networkName);
     default:
       throw new Error(`Got network ${networkName}, but only accept 'sandbox', 'testnet', 'mainnet' and 'custom'`);
   }
diff --git a/packages/js/src/worker.ts b/packages/js/src/worker.ts
index f14aebd5..579cffd6 100644
--- a/packages/js/src/worker.ts
+++ b/packages/js/src/worker.ts
@@ -8,6 +8,8 @@ import {JsonRpcProvider} from './jsonrpc';
 import {debug} from './internal-utils';
 import {SandboxServer} from './server/server';
 
+const API_KEY_HEADER = 'x-api-key';
+
 /**
  * The main interface to near-workspaces. Create a new worker instance with {@link Worker.init}, then run code on it.
  */
@@ -65,24 +67,40 @@ export abstract class Worker {
 // Connect to a custom network.
 // Note: the burden of ensuring the methods that are able to be called are left up to the user.
 export class CustomnetWorker extends Worker {
+  private readonly clientConfig: ClientConfig = urlConfigFromNetwork({network: 'custom', rpcAddr: this.config.rpcAddr});
+
   static async init(config: Partial<Config>): Promise<CustomnetWorker> {
     debug('Lifecycle.CustomnetWorker.create()', 'config:', config);
-    const fullConfig = {...this.defaultConfig, ...config};
+    const fullConfig = {
+      homeDir: 'ignored',
+      port: 3030,
+      rm: false,
+      refDir: null,
+      ...urlConfigFromNetwork({network: 'custom', rpcAddr: config.rpcAddr}), // Copied over, can't access member clientConfig here
+      ...config,
+    };
+
     const worker = new CustomnetWorker(fullConfig);
+    if (config.apiKey) {
+      worker.provider.connection.headers = {
+        ...worker.provider.connection.headers, [API_KEY_HEADER]: config.apiKey,
+      };
+    }
+
     await worker.manager.init();
     return worker;
   }
 
   get provider(): JsonRpcProvider {
-    return JsonRpcProvider.from(CustomnetWorker.clientConfig);
+    return JsonRpcProvider.from(this.clientConfig);
   }
 
   async tearDown(): Promise<void> {
-    // We are not stopping any server here because we are using Testnet
+    // We are not stopping any server here because it is an external network.
     return Promise.resolve();
   }
 
-  static get defaultConfig(): Config {
+  get defaultConfig(): Config {
     return {
       homeDir: 'ignored',
       port: 3030,
@@ -91,17 +109,20 @@ export class CustomnetWorker extends Worker {
       ...this.clientConfig,
     };
   }
-
-  private static get clientConfig(): ClientConfig {
-    return urlConfigFromNetwork('custom');
-  }
 }
 
 export class TestnetWorker extends Worker {
   static async init(config: Partial<Config>): Promise<TestnetWorker> {
     debug('Lifecycle.TestnetWorker.create()', 'config:', config);
     const fullConfig = {...this.defaultConfig, ...config};
+
     const worker = new TestnetWorker(fullConfig);
+    if (config.apiKey) {
+      worker.provider.connection.headers = {
+        ...worker.provider.connection.headers, [API_KEY_HEADER]: config.apiKey,
+      };
+    }
+
     await worker.manager.init();
     return worker;
   }
@@ -157,6 +178,12 @@ export class SandboxWorker extends Worker {
     const release = await lock(syncFilename, retryOptions);
     const defaultConfig = await this.defaultConfig();
     const worker = new SandboxWorker({...defaultConfig, ...config});
+    if (config.apiKey) {
+      worker.provider.connection.headers = {
+        ...worker.provider.connection.headers, [API_KEY_HEADER]: config.apiKey,
+      };
+    }
+
     worker.server = await SandboxServer.init(worker.config);
     await worker.server.start();
     // Release file lock after near node start