diff --git a/README.md b/README.md
index 60ed0a83..3ac32a5e 100644
--- a/README.md
+++ b/README.md
@@ -292,3 +292,18 @@ Pro Tips
   * specify which port to run on
 
   * and more!
+
+Env variables
+========
+```text
+NEAR_CLI_MAINNET_RPC_SERVER_URL
+NEAR_CLI_TESTNET_RPC_SERVER_URL
+```
+Clear them in case you want to get back to the default RPC server.
+
+Example:
+
+```shell
+export NEAR_CLI_MAINNET_RPC_SERVER_URL=<put_your_rpc_server_url_here>
+```
+here is a testcase: [jsonrpc.ava.js](./packages/js/__tests__/jsonrpc.ava.js)
diff --git a/packages/js/__tests__/jsonrpc.ava.js b/packages/js/__tests__/jsonrpc.ava.js
new file mode 100644
index 00000000..1e826f42
--- /dev/null
+++ b/packages/js/__tests__/jsonrpc.ava.js
@@ -0,0 +1,13 @@
+import process from 'process';
+
+import test from 'ava';
+
+import {JsonRpcProvider} from '..';
+
+test('check url', t => {
+  const provider = JsonRpcProvider.fromNetwork('mainnet');
+  if (process.env.NEAR_CLI_MAINNET_RPC_SERVER_URL) {
+    console.log('use rpc', process.env.NEAR_CLI_MAINNET_RPC_SERVER_URL);
+    t.is(provider.connection.url, process.env.NEAR_CLI_MAINNET_RPC_SERVER_URL.toString());
+  }
+});
diff --git a/packages/js/dist/jsonrpc.d.ts.map b/packages/js/dist/jsonrpc.d.ts.map
index 29ebbbb9..66d89559 100644
--- a/packages/js/dist/jsonrpc.d.ts.map
+++ b/packages/js/dist/jsonrpc.d.ts.map
@@ -1 +1 @@
-{"version":3,"file":"jsonrpc.d.ts","sourceRoot":"","sources":["../src/jsonrpc.ts"],"names":[],"mappings":";AACA,OAAO,EAAC,MAAM,EAAC,MAAM,QAAQ,CAAC;AAG9B,OAAO,EAAC,OAAO,EAAC,MAAM,UAAU,CAAC;AACjC,OAAO,EAAC,OAAO,EAAoB,WAAW,EAAE,kBAAkB,EAAE,cAAc,EAAE,UAAU,EAAmB,OAAO,EAAE,QAAQ,EAAE,SAAS,EAAoB,KAAK,EAAoB,SAAS,EAAE,OAAO,EAAE,aAAa,EAAE,aAAa,EAAC,MAAM,SAAS,CAAC;AAG3P;;;GAGG;AACH,qBAAa,eAAgB,SAAQ,OAAO;IAC1C,OAAO,CAAC,MAAM,CAAC,QAAQ,CAAC,SAAS,CAA2C;IAE5E;;;;OAIG;IACH,MAAM,CAAC,IAAI,CAAC,MAAM,EAAE,MAAM,GAAG;QAAC,OAAO,EAAE,MAAM,CAAA;KAAC,GAAG,eAAe;IAShE,MAAM,CAAC,WAAW,CAAC,OAAO,EAAE,OAAO,GAAG,eAAe;IAQrD;;;;OAIG;IACG,QAAQ,CAAC,SAAS,EAAE,MAAM,EAAE,UAAU,CAAC,EAAE;QAAC,QAAQ,EAAE,OAAO,CAAA;KAAC,GAAG;QAAC,QAAQ,EAAE,QAAQ,CAAA;KAAC,GAAG,OAAO,CAAC,MAAM,CAAC;IAI3G;;;;OAIG;IACG,WAAW,CAAC,SAAS,EAAE,MAAM,EAAE,UAAU,GAAE;QAAC,QAAQ,EAAE,OAAO,CAAA;KAAC,GAAG;QAAC,QAAQ,EAAE,QAAQ,CAAA;KAAc,GAAG,OAAO,CAAC,MAAM,CAAC;IASpH,WAAW,CAAC,SAAS,EAAE,MAAM,EAAE,UAAU,GAAE;QAAC,QAAQ,EAAE,OAAO,CAAA;KAAC,GAAG;QAAC,QAAQ,EAAE,QAAQ,CAAA;KAAc,GAAG,OAAO,CAAC,WAAW,CAAC;IAQzH,aAAa,CAAC,SAAS,EAAE,MAAM,EAAE,UAAU,CAAC,EAAE;QAAC,QAAQ,EAAE,OAAO,CAAA;KAAC,GAAG;QAAC,QAAQ,EAAE,QAAQ,CAAA;KAAC,GAAG,OAAO,CAAC,OAAO,CAAC;IAS3G,aAAa,CAAC,SAAS,EAAE,MAAM,EAAE,SAAS,EAAE,SAAS,GAAG,MAAM,EAAE,UAAU,GAAE;QAAC,QAAQ,EAAE,OAAO,CAAA;KAAC,GAAG;QAAC,QAAQ,EAAE,QAAQ,CAAA;KAAc,GAAG,OAAO,CAAC,aAAa,CAAC;IAS5J,cAAc,CAAC,SAAS,EAAE,MAAM,EAAE,UAAU,GAAE;QAAC,QAAQ,EAAE,OAAO,CAAA;KAAC,GAAG;QAAC,QAAQ,EAAE,QAAQ,CAAA;KAAc,GAAG,OAAO,CAAC,aAAa,CAAC;IAQ9H,cAAc,CAAC,UAAU,GAAE;QAAC,QAAQ,EAAE,OAAO,CAAA;KAAC,GAAG;QAAC,QAAQ,EAAE,QAAQ,CAAA;KAAc,GAAG,OAAO,CAAC,kBAAkB,CAAC;IAKhH,cAAc,CAAC,SAAS,EAAE,MAAM,EAAE,UAAU,CAAC,EAAE;QAAC,QAAQ,EAAE,OAAO,CAAA;KAAC,GAAG;QAAC,QAAQ,EAAE,QAAQ,CAAA;KAAC,GAAG,OAAO,CAAC,cAAc,CAAC;IAiBnH,QAAQ,CAAC,SAAS,EAAE,MAAM,EAAE,UAAU,EAAE,MAAM,EAAE,IAAI,EAAE,MAAM,CAAC,MAAM,EAAE,OAAO,CAAC,GAAG,UAAU,EAAE,UAAU,CAAC,EAAE;QAAC,QAAQ,EAAE,OAAO,CAAA;KAAC,GAAG;QAAC,QAAQ,EAAE,QAAQ,CAAA;KAAC,GAAG,OAAO,CAAC,UAAU,CAAC;IAK/K;;;;;;;OAOG;IACG,WAAW,CAAC,SAAS,EAAE,MAAM,EAAE,UAAU,EAAE,MAAM,EAAE,IAAI,EAAE,MAAM,EAAE,UAAU,GAAE;QAAC,QAAQ,EAAE,OAAO,CAAA;KAAC,GAAG;QAAC,QAAQ,EAAE,QAAQ,CAAA;KAAc,GAAG,OAAO,CAAC,UAAU,CAAC;IAUhK;;;;;;;OAOG;IACG,SAAS,CAAC,SAAS,EAAE,MAAM,EAAE,MAAM,EAAE,MAAM,GAAG,UAAU,EAAE,UAAU,CAAC,EAAE;QAAC,QAAQ,EAAE,OAAO,CAAA;KAAC,GAAG;QAAC,QAAQ,EAAE,QAAQ,CAAA;KAAC,GAAG,OAAO,CAAC,KAAK,CAAC;QAAC,GAAG,EAAE,MAAM,CAAC;QAAC,KAAK,EAAE,MAAM,CAAA;KAAC,CAAC,CAAC;IAStK;;;;;;;OAOG;IACG,YAAY,CAAC,SAAS,EAAE,MAAM,EAAE,MAAM,EAAE,MAAM,GAAG,UAAU,EAAE,UAAU,CAAC,EAAE;QAAC,QAAQ,EAAE,OAAO,CAAA;KAAC,GAAG;QAAC,QAAQ,EAAE,QAAQ,CAAA;KAAC,GAAG,OAAO,CAAC,SAAS,EAAE,CAAC;IAWjJ;;;;;OAKG;IACG,iBAAiB,CAAC,OAAO,EAAE,OAAO,GAAG,OAAO,CAAC,KAAK,CAAC;CAG1D;AAED,eAAO,MAAM,UAAU,iBAAyC,CAAC;AACjE,eAAO,MAAM,UAAU,iBAAyC,CAAC"}
\ No newline at end of file
+{"version":3,"file":"jsonrpc.d.ts","sourceRoot":"","sources":["../src/jsonrpc.ts"],"names":[],"mappings":";AACA,OAAO,EAAC,MAAM,EAAC,MAAM,QAAQ,CAAC;AAI9B,OAAO,EAAC,OAAO,EAAC,MAAM,UAAU,CAAC;AACjC,OAAO,EAAC,OAAO,EAAoB,WAAW,EAAE,kBAAkB,EAAE,cAAc,EAAE,UAAU,EAAmB,OAAO,EAAE,QAAQ,EAAE,SAAS,EAAoB,KAAK,EAAoB,SAAS,EAAE,OAAO,EAAE,aAAa,EAAE,aAAa,EAAC,MAAM,SAAS,CAAC;AAG3P;;;GAGG;AACH,qBAAa,eAAgB,SAAQ,OAAO;IAC1C,OAAO,CAAC,MAAM,CAAC,QAAQ,CAAC,SAAS,CAA2C;IAE5E;;;;OAIG;IACH,MAAM,CAAC,IAAI,CAAC,MAAM,EAAE,MAAM,GAAG;QAAC,OAAO,EAAE,MAAM,CAAA;KAAC,GAAG,eAAe;IAShE,MAAM,CAAC,WAAW,CAAC,OAAO,EAAE,OAAO,GAAG,eAAe;IAQrD;;;;OAIG;IACG,QAAQ,CAAC,SAAS,EAAE,MAAM,EAAE,UAAU,CAAC,EAAE;QAAC,QAAQ,EAAE,OAAO,CAAA;KAAC,GAAG;QAAC,QAAQ,EAAE,QAAQ,CAAA;KAAC,GAAG,OAAO,CAAC,MAAM,CAAC;IAI3G;;;;OAIG;IACG,WAAW,CAAC,SAAS,EAAE,MAAM,EAAE,UAAU,GAAE;QAAC,QAAQ,EAAE,OAAO,CAAA;KAAC,GAAG;QAAC,QAAQ,EAAE,QAAQ,CAAA;KAAc,GAAG,OAAO,CAAC,MAAM,CAAC;IASpH,WAAW,CAAC,SAAS,EAAE,MAAM,EAAE,UAAU,GAAE;QAAC,QAAQ,EAAE,OAAO,CAAA;KAAC,GAAG;QAAC,QAAQ,EAAE,QAAQ,CAAA;KAAc,GAAG,OAAO,CAAC,WAAW,CAAC;IAQzH,aAAa,CAAC,SAAS,EAAE,MAAM,EAAE,UAAU,CAAC,EAAE;QAAC,QAAQ,EAAE,OAAO,CAAA;KAAC,GAAG;QAAC,QAAQ,EAAE,QAAQ,CAAA;KAAC,GAAG,OAAO,CAAC,OAAO,CAAC;IAS3G,aAAa,CAAC,SAAS,EAAE,MAAM,EAAE,SAAS,EAAE,SAAS,GAAG,MAAM,EAAE,UAAU,GAAE;QAAC,QAAQ,EAAE,OAAO,CAAA;KAAC,GAAG;QAAC,QAAQ,EAAE,QAAQ,CAAA;KAAc,GAAG,OAAO,CAAC,aAAa,CAAC;IAS5J,cAAc,CAAC,SAAS,EAAE,MAAM,EAAE,UAAU,GAAE;QAAC,QAAQ,EAAE,OAAO,CAAA;KAAC,GAAG;QAAC,QAAQ,EAAE,QAAQ,CAAA;KAAc,GAAG,OAAO,CAAC,aAAa,CAAC;IAQ9H,cAAc,CAAC,UAAU,GAAE;QAAC,QAAQ,EAAE,OAAO,CAAA;KAAC,GAAG;QAAC,QAAQ,EAAE,QAAQ,CAAA;KAAc,GAAG,OAAO,CAAC,kBAAkB,CAAC;IAKhH,cAAc,CAAC,SAAS,EAAE,MAAM,EAAE,UAAU,CAAC,EAAE;QAAC,QAAQ,EAAE,OAAO,CAAA;KAAC,GAAG;QAAC,QAAQ,EAAE,QAAQ,CAAA;KAAC,GAAG,OAAO,CAAC,cAAc,CAAC;IAiBnH,QAAQ,CAAC,SAAS,EAAE,MAAM,EAAE,UAAU,EAAE,MAAM,EAAE,IAAI,EAAE,MAAM,CAAC,MAAM,EAAE,OAAO,CAAC,GAAG,UAAU,EAAE,UAAU,CAAC,EAAE;QAAC,QAAQ,EAAE,OAAO,CAAA;KAAC,GAAG;QAAC,QAAQ,EAAE,QAAQ,CAAA;KAAC,GAAG,OAAO,CAAC,UAAU,CAAC;IAK/K;;;;;;;OAOG;IACG,WAAW,CAAC,SAAS,EAAE,MAAM,EAAE,UAAU,EAAE,MAAM,EAAE,IAAI,EAAE,MAAM,EAAE,UAAU,GAAE;QAAC,QAAQ,EAAE,OAAO,CAAA;KAAC,GAAG;QAAC,QAAQ,EAAE,QAAQ,CAAA;KAAc,GAAG,OAAO,CAAC,UAAU,CAAC;IAUhK;;;;;;;OAOG;IACG,SAAS,CAAC,SAAS,EAAE,MAAM,EAAE,MAAM,EAAE,MAAM,GAAG,UAAU,EAAE,UAAU,CAAC,EAAE;QAAC,QAAQ,EAAE,OAAO,CAAA;KAAC,GAAG;QAAC,QAAQ,EAAE,QAAQ,CAAA;KAAC,GAAG,OAAO,CAAC,KAAK,CAAC;QAAC,GAAG,EAAE,MAAM,CAAC;QAAC,KAAK,EAAE,MAAM,CAAA;KAAC,CAAC,CAAC;IAStK;;;;;;;OAOG;IACG,YAAY,CAAC,SAAS,EAAE,MAAM,EAAE,MAAM,EAAE,MAAM,GAAG,UAAU,EAAE,UAAU,CAAC,EAAE;QAAC,QAAQ,EAAE,OAAO,CAAA;KAAC,GAAG;QAAC,QAAQ,EAAE,QAAQ,CAAA;KAAC,GAAG,OAAO,CAAC,SAAS,EAAE,CAAC;IAWjJ;;;;;OAKG;IACG,iBAAiB,CAAC,OAAO,EAAE,OAAO,GAAG,OAAO,CAAC,KAAK,CAAC;CAG1D;AAED,eAAO,MAAM,UAAU,iBAAyC,CAAC;AACjE,eAAO,MAAM,UAAU,iBAAyC,CAAC"}
\ No newline at end of file
diff --git a/packages/js/dist/jsonrpc.js b/packages/js/dist/jsonrpc.js
index d26742b0..6a2a0aae 100644
--- a/packages/js/dist/jsonrpc.js
+++ b/packages/js/dist/jsonrpc.js
@@ -1,8 +1,12 @@
 "use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
 Object.defineProperty(exports, "__esModule", { value: true });
 exports.MainnetRpc = exports.TestnetRpc = exports.JsonRpcProvider = void 0;
 // eslint-disable unicorn/no-object-as-default-parameter
 const buffer_1 = require("buffer");
+const process_1 = __importDefault(require("process"));
 const near_units_1 = require("near-units");
 const transaction_1 = require("near-api-js/lib/transaction");
 const types_1 = require("./types");
@@ -26,8 +30,8 @@ class JsonRpcProvider extends types_1.JSONRpc {
     }
     static fromNetwork(network) {
         switch (network) {
-            case 'mainnet': return exports.MainnetRpc;
-            case 'testnet': return exports.TestnetRpc;
+            case 'mainnet': return process_1.default.env.NEAR_CLI_MAINNET_RPC_SERVER_URL ? JsonRpcProvider.from(process_1.default.env.NEAR_CLI_MAINNET_RPC_SERVER_URL) : exports.MainnetRpc;
+            case 'testnet': return process_1.default.env.NEAR_CLI_TESTNET_RPC_SERVER_URL ? JsonRpcProvider.from(process_1.default.env.NEAR_CLI_TESTNET_RPC_SERVER_URL) : exports.TestnetRpc;
             default: throw new TypeError('Invalid network only mainnet or testnet');
         }
     }
diff --git a/packages/js/dist/jsonrpc.js.map b/packages/js/dist/jsonrpc.js.map
index 132f7971..2c9657f9 100644
--- a/packages/js/dist/jsonrpc.js.map
+++ b/packages/js/dist/jsonrpc.js.map
@@ -1 +1 @@
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\ No newline at end of file
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diff --git a/packages/js/dist/transaction.d.ts.map b/packages/js/dist/transaction.d.ts.map
index fa368ee1..64facd6c 100644
--- a/packages/js/dist/transaction.d.ts.map
+++ b/packages/js/dist/transaction.d.ts.map
@@ -1 +1 @@
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\ No newline at end of file
+{"version":3,"file":"transaction.d.ts","sourceRoot":"","sources":["../src/transaction.ts"],"names":[],"mappings":";AAAA,OAAO,EAAC,MAAM,EAAC,MAAM,QAAQ,CAAC;AAE9B,OAAO,EAAC,GAAG,EAAC,MAAM,KAAK,CAAC;AACxB,OAAO,EAAC,IAAI,EAAC,MAAM,YAAY,CAAC;AAChC,OAAO,EAAC,iBAAiB,EAAC,MAAM,sBAAsB,CAAC;AACvD,OAAO,EACL,MAAM,EACN,SAAS,EACT,SAAS,EAUT,EAAE,EAEF,OAAO,EACP,YAAY,EACb,MAAM,SAAS,CAAC;AAIjB,8BAAsB,WAAW;IAC/B,QAAQ,CAAC,UAAU,EAAE,MAAM,CAAC;IAC5B,QAAQ,CAAC,QAAQ,EAAE,MAAM,CAAC;IAC1B,QAAQ,CAAC,OAAO,EAAE,MAAM,EAAE,CAAM;IAChC,OAAO,CAAC,kBAAkB,CAAS;IACnC,OAAO,CAAC,eAAe,CAAC,CAAO;gBAEnB,MAAM,EAAE,YAAY,GAAG,MAAM,EAAE,QAAQ,EAAE,YAAY,GAAG,MAAM;IAK1E,MAAM,CAAC,SAAS,EAAE,MAAM,GAAG,SAAS,EAAE,SAAS,GAAE,SAA2B,GAAG,IAAI;IAKnF,aAAa,IAAI,IAAI;IAMrB,aAAa,CAAC,aAAa,EAAE,MAAM,GAAG,IAAI;IAK1C,SAAS,CAAC,SAAS,EAAE,MAAM,GAAG,SAAS,GAAG,IAAI;IAK9C;;;;OAIG;IACG,kBAAkB,CAAC,IAAI,EAAE,MAAM,GAAG,GAAG,GAAG,UAAU,GAAG,MAAM,GAAG,OAAO,CAAC,WAAW,CAAC;IASxF,cAAc,CAAC,IAAI,EAAE,UAAU,GAAG,MAAM,GAAG,IAAI;IAK/C,YAAY,CACV,UAAU,EAAE,MAAM,EAClB,IAAI,EAAE,MAAM,CAAC,MAAM,EAAE,OAAO,CAAC,GAAG,UAAU,EAC1C,EAEE,GAA+B,EAC/B,eAA4B,GAC7B,GAAE;QAAC,GAAG,CAAC,EAAE,EAAE,GAAG,MAAM,CAAC;QAAC,eAAe,CAAC,EAAE,EAAE,GAAG,MAAM,CAAA;KAAM,GACzD,IAAI;IAOP,KAAK,CAAC,MAAM,EAAE,EAAE,GAAG,MAAM,EAAE,SAAS,EAAE,SAAS,GAAG,MAAM,GAAG,IAAI;IAK/D,QAAQ,CAAC,MAAM,EAAE,MAAM,GAAG,EAAE,GAAG,IAAI;IAMnC,IAAI,cAAc,IAAI,OAAO,CAE5B;IAED,IAAI,cAAc,IAAI,IAAI,CAEzB;IAED,QAAQ,CAAC,QAAQ,CAAC,OAAO,CAAC,EAAE,OAAO,GAAG,OAAO,CAAC,iBAAiB,CAAC;CACjE"}
\ No newline at end of file
diff --git a/packages/js/dist/transaction.js b/packages/js/dist/transaction.js
index 40efc816..fb27aa83 100644
--- a/packages/js/dist/transaction.js
+++ b/packages/js/dist/transaction.js
@@ -63,7 +63,9 @@ class Transaction {
         this.actions.push((0, types_1.deployContract)(code));
         return this;
     }
-    functionCall(methodName, args, { gas = types_1.DEFAULT_FUNCTION_CALL_GAS, attachedDeposit = utils_1.NO_DEPOSIT, } = {}) {
+    functionCall(methodName, args, { 
+    // @typescript-eslint/no-unsafe-assignment
+    gas = types_1.DEFAULT_FUNCTION_CALL_GAS, attachedDeposit = utils_1.NO_DEPOSIT, } = {}) {
         this.actions.push((0, types_1.functionCall)(methodName, args, (0, utils_1.parseGas)(gas), (0, utils_1.parseNEAR)(attachedDeposit)));
         return this;
     }
diff --git a/packages/js/dist/transaction.js.map b/packages/js/dist/transaction.js.map
index 82f271d5..a8cde530 100644
--- a/packages/js/dist/transaction.js.map
+++ b/packages/js/dist/transaction.js.map
@@ -1 +1 @@
-{"version":3,"file":"transaction.js","sourceRoot":"","sources":["../src/transaction.ts"],"names":[],"mappings":";;;;;;;;;;;;;;;;;;;;;;AACA,gDAAkC;AAElC,2CAAgC;AAEhC,mCAiBiB;AACjB,qDAAsD;AACtD,mCAAwD;AAExD,MAAsB,WAAW;IAO/B,YAAY,MAA6B,EAAE,QAA+B;QAJjE,YAAO,GAAa,EAAE,CAAC;QACxB,uBAAkB,GAAG,KAAK,CAAC;QAIjC,IAAI,CAAC,QAAQ,GAAG,OAAO,MAAM,KAAK,QAAQ,CAAC,CAAC,CAAC,MAAM,CAAC,CAAC,CAAC,MAAM,CAAC,SAAS,CAAC;QACvE,IAAI,CAAC,UAAU,GAAG,OAAO,QAAQ,KAAK,QAAQ,CAAC,CAAC,CAAC,QAAQ,CAAC,CAAC,CAAC,QAAQ,CAAC,SAAS,CAAC;IACjF,CAAC;IAED,MAAM,CAAC,SAA6B,EAAE,YAAuB,IAAA,qBAAa,GAAE;QAC1E,IAAI,CAAC,OAAO,CAAC,IAAI,CAAC,IAAA,cAAM,EAAC,iBAAS,CAAC,IAAI,CAAC,SAAS,CAAC,EAAE,SAAS,CAAC,CAAC,CAAC;QAChE,OAAO,IAAI,CAAC;IACd,CAAC;IAED,aAAa;QACX,IAAI,CAAC,kBAAkB,GAAG,IAAI,CAAC;QAC/B,IAAI,CAAC,OAAO,CAAC,IAAI,CAAC,IAAA,qBAAa,GAAE,CAAC,CAAC;QACnC,OAAO,IAAI,CAAC;IACd,CAAC;IAED,aAAa,CAAC,aAAqB;QACjC,IAAI,CAAC,OAAO,CAAC,IAAI,CAAC,IAAA,qBAAa,EAAC,aAAa,CAAC,CAAC,CAAC;QAChD,OAAO,IAAI,CAAC;IACd,CAAC;IAED,SAAS,CAAC,SAA6B;QACrC,IAAI,CAAC,OAAO,CAAC,IAAI,CAAC,IAAA,iBAAS,EAAC,iBAAS,CAAC,IAAI,CAAC,SAAS,CAAC,CAAC,CAAC,CAAC;QACxD,OAAO,IAAI,CAAC;IACd,CAAC;IAED;;;;OAIG;IACH,KAAK,CAAC,kBAAkB,CAAC,IAAwC;QAC/D,OAAO,IAAI,CAAC,cAAc,CAAC,IAAA,2BAAU,EAAC,IAAI,CAAC;YACzC,CAAC,CAAC,MAAM,EAAE,CAAC,QAAQ,CACjB,IAAI,CAAC,QAAQ,EAAE,CAAC,UAAU,CAAC,GAAG,CAAC,CAAC,CAAC,CAAC,IAAI,CAAC,CAAC,CAAC,MAAM,IAAA,yBAAQ,EAAC,IAAI,CAAC,QAAQ,EAAE,CAAC,CACzE;YACD,CAAC,CAAC,IAAI,CACP,CAAC;IACJ,CAAC;IAED,cAAc,CAAC,IAAyB;QACtC,IAAI,CAAC,OAAO,CAAC,IAAI,CAAC,IAAA,sBAAc,EAAC,IAAI,CAAC,CAAC,CAAC;QACxC,OAAO,IAAI,CAAC;IACd,CAAC;IAED,YAAY,CACV,UAAkB,EAClB,IAA0C,EAC1C,EACE,GAAG,GAAG,iCAAyB,EAC/B,eAAe,GAAG,kBAAU,MAC0B,EAAE;QAE1D,IAAI,CAAC,OAAO,CAAC,IAAI,CACf,IAAA,oBAAY,EAAC,UAAU,EAAE,IAAI,EAAE,IAAA,gBAAQ,EAAC,GAAG,CAAC,EAAE,IAAA,iBAAS,EAAC,eAAe,CAAC,CAAC,CAC1E,CAAC;QACF,OAAO,IAAI,CAAC;IACd,CAAC;IAED,KAAK,CAAC,MAAmB,EAAE,SAA6B;QACtD,IAAI,CAAC,OAAO,CAAC,IAAI,CAAC,IAAA,aAAK,EAAC,IAAI,UAAE,CAAC,MAAM,CAAC,EAAE,iBAAS,CAAC,IAAI,CAAC,SAAS,CAAC,CAAC,CAAC,CAAC;QACpE,OAAO,IAAI,CAAC;IACd,CAAC;IAED,QAAQ,CAAC,MAAmB;QAC1B,IAAI,CAAC,eAAe,GAAG,IAAA,iBAAS,EAAC,MAAM,CAAC,CAAC;QACzC,IAAI,CAAC,OAAO,CAAC,IAAI,CAAC,IAAA,gBAAQ,EAAC,IAAI,CAAC,eAAe,CAAC,CAAC,CAAC;QAClD,OAAO,IAAI,CAAC;IACd,CAAC;IAED,IAAI,cAAc;QAChB,OAAO,IAAI,CAAC,kBAAkB,CAAC;IACjC,CAAC;IAED,IAAI,cAAc;;QAChB,OAAO,MAAA,IAAI,CAAC,eAAe,mCAAI,iBAAI,CAAC,IAAI,CAAC,GAAG,CAAC,CAAC;IAChD,CAAC;CAGF;AAtFD,kCAsFC"}
\ No newline at end of file
+{"version":3,"file":"transaction.js","sourceRoot":"","sources":["../src/transaction.ts"],"names":[],"mappings":";;;;;;;;;;;;;;;;;;;;;;AACA,gDAAkC;AAElC,2CAAgC;AAEhC,mCAiBiB;AACjB,qDAAsD;AACtD,mCAAwD;AAExD,MAAsB,WAAW;IAO/B,YAAY,MAA6B,EAAE,QAA+B;QAJjE,YAAO,GAAa,EAAE,CAAC;QACxB,uBAAkB,GAAG,KAAK,CAAC;QAIjC,IAAI,CAAC,QAAQ,GAAG,OAAO,MAAM,KAAK,QAAQ,CAAC,CAAC,CAAC,MAAM,CAAC,CAAC,CAAC,MAAM,CAAC,SAAS,CAAC;QACvE,IAAI,CAAC,UAAU,GAAG,OAAO,QAAQ,KAAK,QAAQ,CAAC,CAAC,CAAC,QAAQ,CAAC,CAAC,CAAC,QAAQ,CAAC,SAAS,CAAC;IACjF,CAAC;IAED,MAAM,CAAC,SAA6B,EAAE,YAAuB,IAAA,qBAAa,GAAE;QAC1E,IAAI,CAAC,OAAO,CAAC,IAAI,CAAC,IAAA,cAAM,EAAC,iBAAS,CAAC,IAAI,CAAC,SAAS,CAAC,EAAE,SAAS,CAAC,CAAC,CAAC;QAChE,OAAO,IAAI,CAAC;IACd,CAAC;IAED,aAAa;QACX,IAAI,CAAC,kBAAkB,GAAG,IAAI,CAAC;QAC/B,IAAI,CAAC,OAAO,CAAC,IAAI,CAAC,IAAA,qBAAa,GAAE,CAAC,CAAC;QACnC,OAAO,IAAI,CAAC;IACd,CAAC;IAED,aAAa,CAAC,aAAqB;QACjC,IAAI,CAAC,OAAO,CAAC,IAAI,CAAC,IAAA,qBAAa,EAAC,aAAa,CAAC,CAAC,CAAC;QAChD,OAAO,IAAI,CAAC;IACd,CAAC;IAED,SAAS,CAAC,SAA6B;QACrC,IAAI,CAAC,OAAO,CAAC,IAAI,CAAC,IAAA,iBAAS,EAAC,iBAAS,CAAC,IAAI,CAAC,SAAS,CAAC,CAAC,CAAC,CAAC;QACxD,OAAO,IAAI,CAAC;IACd,CAAC;IAED;;;;OAIG;IACH,KAAK,CAAC,kBAAkB,CAAC,IAAwC;QAC/D,OAAO,IAAI,CAAC,cAAc,CAAC,IAAA,2BAAU,EAAC,IAAI,CAAC;YACzC,CAAC,CAAC,MAAM,EAAE,CAAC,QAAQ,CACjB,IAAI,CAAC,QAAQ,EAAE,CAAC,UAAU,CAAC,GAAG,CAAC,CAAC,CAAC,CAAC,IAAI,CAAC,CAAC,CAAC,MAAM,IAAA,yBAAQ,EAAC,IAAI,CAAC,QAAQ,EAAE,CAAC,CACzE;YACD,CAAC,CAAC,IAAI,CACP,CAAC;IACJ,CAAC;IAED,cAAc,CAAC,IAAyB;QACtC,IAAI,CAAC,OAAO,CAAC,IAAI,CAAC,IAAA,sBAAc,EAAC,IAAI,CAAC,CAAC,CAAC;QACxC,OAAO,IAAI,CAAC;IACd,CAAC;IAED,YAAY,CACV,UAAkB,EAClB,IAA0C,EAC1C;IACE,0CAA0C;IAC1C,GAAG,GAAG,iCAAyB,EAC/B,eAAe,GAAG,kBAAU,MAC0B,EAAE;QAE1D,IAAI,CAAC,OAAO,CAAC,IAAI,CACf,IAAA,oBAAY,EAAC,UAAU,EAAE,IAAI,EAAE,IAAA,gBAAQ,EAAC,GAAG,CAAC,EAAE,IAAA,iBAAS,EAAC,eAAe,CAAC,CAAC,CAC1E,CAAC;QACF,OAAO,IAAI,CAAC;IACd,CAAC;IAED,KAAK,CAAC,MAAmB,EAAE,SAA6B;QACtD,IAAI,CAAC,OAAO,CAAC,IAAI,CAAC,IAAA,aAAK,EAAC,IAAI,UAAE,CAAC,MAAM,CAAC,EAAE,iBAAS,CAAC,IAAI,CAAC,SAAS,CAAC,CAAC,CAAC,CAAC;QACpE,OAAO,IAAI,CAAC;IACd,CAAC;IAED,QAAQ,CAAC,MAAmB;QAC1B,IAAI,CAAC,eAAe,GAAG,IAAA,iBAAS,EAAC,MAAM,CAAC,CAAC;QACzC,IAAI,CAAC,OAAO,CAAC,IAAI,CAAC,IAAA,gBAAQ,EAAC,IAAI,CAAC,eAAe,CAAC,CAAC,CAAC;QAClD,OAAO,IAAI,CAAC;IACd,CAAC;IAED,IAAI,cAAc;QAChB,OAAO,IAAI,CAAC,kBAAkB,CAAC;IACjC,CAAC;IAED,IAAI,cAAc;;QAChB,OAAO,MAAA,IAAI,CAAC,eAAe,mCAAI,iBAAI,CAAC,IAAI,CAAC,GAAG,CAAC,CAAC;IAChD,CAAC;CAGF;AAvFD,kCAuFC"}
\ No newline at end of file
diff --git a/packages/js/dist/utils.d.ts.map b/packages/js/dist/utils.d.ts.map
index 1c59b25f..1cec7cd8 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;AAaD,wBAAgB,oBAAoB,CAAC,OAAO,EAAE,MAAM,GAAG;IAAC,OAAO,EAAE,MAAM,CAAA;CAAC,GAAG,YAAY,CActF;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,CAczD;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,CAAA;CAAC,GAAG,YAAY,CActF;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,CAczD;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 d44f8b8f..e0b48ab0 100644
--- a/packages/js/dist/utils.js
+++ b/packages/js/dist/utils.js
@@ -75,9 +75,16 @@ function isTopLevelAccount(accountId) {
 }
 exports.isTopLevelAccount = isTopLevelAccount;
 function configFromDomain(network) {
+    let rpcAddr = `https://archival-rpc.${network}.near.org`;
+    if (network === 'mainnet' && process.env.NEAR_CLI_MAINNET_RPC_SERVER_URL) {
+        rpcAddr = process.env.NEAR_CLI_MAINNET_RPC_SERVER_URL;
+    }
+    else if (network === 'testnet' && process.env.NEAR_CLI_TESTNET_RPC_SERVER_URL) {
+        rpcAddr = process.env.NEAR_CLI_TESTNET_RPC_SERVER_URL;
+    }
     return {
         network,
-        rpcAddr: `https://archival-rpc.${network}.near.org`,
+        rpcAddr,
         walletUrl: `https://wallet.${network}.near.org`,
         helperUrl: `https://helper.${network}.near.org`,
         explorerUrl: `https://explorer.${network}.near.org`,
diff --git a/packages/js/dist/utils.js.map b/packages/js/dist/utils.js.map
index e3ec5858..06fd15f1 100644
--- a/packages/js/dist/utils.js.map
+++ b/packages/js/dist/utils.js.map
@@ -1 +1 @@
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\ No newline at end of file
diff --git a/packages/js/package.json b/packages/js/package.json
index d2dd63dc..12af148f 100644
--- a/packages/js/package.json
+++ b/packages/js/package.json
@@ -40,7 +40,8 @@
     "test:sandbox": "yarn build && ava --verbose",
     "test:sandbox:ci": "yarn build && NEAR_WORKSPACES_DEBUG=true ava --verbose",
     "test": "ava --verbose && yarn test:testnet",
-    "clean:accounts": "ts-node ./scripts/delete-accounts.ts"
+    "clean:accounts": "ts-node ./scripts/delete-accounts.ts",
+    "test:jsonrpc:env": " NEAR_CLI_MAINNET_RPC_SERVER_URL=https://near-mainnet.api.pagoda.co/rpc/v1 ava __tests__/jsonrpc.ava.js"
   },
   "files": [
     "dist/",
diff --git a/packages/js/src/jsonrpc.ts b/packages/js/src/jsonrpc.ts
index dcb4e39d..e352f58f 100644
--- a/packages/js/src/jsonrpc.ts
+++ b/packages/js/src/jsonrpc.ts
@@ -1,5 +1,6 @@
 // eslint-disable unicorn/no-object-as-default-parameter
 import {Buffer} from 'buffer';
+import process from 'process';
 import {NEAR} from 'near-units';
 import {stringifyJsonOrBytes} from 'near-api-js/lib/transaction';
 import {Records} from './record';
@@ -29,8 +30,8 @@ export class JsonRpcProvider extends JSONRpc {
 
   static fromNetwork(network: Network): JsonRpcProvider {
     switch (network) {
-      case 'mainnet': return MainnetRpc;
-      case 'testnet': return TestnetRpc;
+      case 'mainnet': return process.env.NEAR_CLI_MAINNET_RPC_SERVER_URL ? JsonRpcProvider.from(process.env.NEAR_CLI_MAINNET_RPC_SERVER_URL) : MainnetRpc;
+      case 'testnet': return process.env.NEAR_CLI_TESTNET_RPC_SERVER_URL ? JsonRpcProvider.from(process.env.NEAR_CLI_TESTNET_RPC_SERVER_URL) : TestnetRpc;
       default: throw new TypeError('Invalid network only mainnet or testnet');
     }
   }
diff --git a/packages/js/src/transaction.ts b/packages/js/src/transaction.ts
index b7780387..2d8e04fa 100644
--- a/packages/js/src/transaction.ts
+++ b/packages/js/src/transaction.ts
@@ -80,6 +80,7 @@ export abstract class Transaction {
     methodName: string,
     args: Record<string, unknown> | Uint8Array,
     {
+      // @typescript-eslint/no-unsafe-assignment
       gas = DEFAULT_FUNCTION_CALL_GAS,
       attachedDeposit = NO_DEPOSIT,
     }: {gas?: BN | string; attachedDeposit?: BN | string} = {},
diff --git a/packages/js/src/utils.ts b/packages/js/src/utils.ts
index d5c199e3..3dd5a7d3 100644
--- a/packages/js/src/utils.ts
+++ b/packages/js/src/utils.ts
@@ -57,9 +57,16 @@ export function isTopLevelAccount(accountId: string): boolean {
 }
 
 function configFromDomain(network: 'testnet' | 'mainnet'): ClientConfig {
+  let rpcAddr = `https://archival-rpc.${network}.near.org`;
+  if (network === 'mainnet' && process.env.NEAR_CLI_MAINNET_RPC_SERVER_URL) {
+    rpcAddr = process.env.NEAR_CLI_MAINNET_RPC_SERVER_URL;
+  } else if (network === 'testnet' && process.env.NEAR_CLI_TESTNET_RPC_SERVER_URL) {
+    rpcAddr = process.env.NEAR_CLI_TESTNET_RPC_SERVER_URL;
+  }
+
   return {
     network,
-    rpcAddr: `https://archival-rpc.${network}.near.org`,
+    rpcAddr,
     walletUrl: `https://wallet.${network}.near.org`,
     helperUrl: `https://helper.${network}.near.org`,
     explorerUrl: `https://explorer.${network}.near.org`,