diff --git a/.env b/.env
new file mode 100644
index 0000000..3292213
--- /dev/null
+++ b/.env
@@ -0,0 +1,27 @@
+# URL of the Ethereum node
+URL=http://localhost:8545
+# Default to 24 hours
+TIMEOUT=86400000
+RETRY_INTERVAL=10000
+POLLING_INTERVAL=30000
+CONFIRMATIONS=1
+# Default to 10 minutes
+CONFIRMATION_TIMEOUT=600000
+GAS_LIMIT_MULTIPLIER=160
+GAS_PRICE_MULTIPLIER=160
+BALANCE_THRESHOLD=0.05
+# Gas price predictor strategy. One of < eth-provider | fast | fastest | safeLow | average >
+GAS_PRICE_PROVIDER=eth-provider
+
+# ETH Gas Station API parameters
+GAS_STATION_API_CHAIN_ID=1
+GAS_STATION_API_URL=https://ethgasstation.info/json/ethgasAPI.json
+GAS_STATION_API_KEY=
+GAS_STATION_API_REQUEST_TIMEOUT_MS=10000
+
+# When loading wallet from MNEMONIC
+MNEMONIC=
+MNEMONIC_PATH=
+
+# When loading wallet from SEED
+SEED=
\ No newline at end of file
diff --git a/.mocharc.json b/.mocharc.json
index bd97ae3..c0a6a66 100644
--- a/.mocharc.json
+++ b/.mocharc.json
@@ -1,7 +1,7 @@
 {
     "extension": ["ts"],
     "timeout": 10000,
-    "require": "ts-node/register",
+    "require": ["ts-node/register", "test/setup.ts"],
     "spec": "test/**/*.spec.ts",
     "watch-files": ["test/**/*.ts"]
 }
diff --git a/Dockerfile b/Dockerfile
index 50519cc..4d3fbe3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -36,6 +36,8 @@ COPY package.json ./
 COPY yarn.lock ./
 RUN yarn install --frozen-lockfile
 
-## We just need the build to execute the command
+# We just need the build to execute the command
 COPY --from=builder /usr/src/app/dist ./dist
+# And the default environment variables
+COPY .env ./
 ENTRYPOINT ["node", "/app/dist/index.js"]
diff --git a/package.json b/package.json
index 2b784da..6744d0e 100644
--- a/package.json
+++ b/package.json
@@ -13,6 +13,7 @@
         "@cartesi/util": "^1.0.1",
         "axios": "^0.21.4",
         "chalk": "^4.1.2",
+        "dotenv": "^10.0.0",
         "ethers": "^5.4.7",
         "humanize-duration": "^3.27.0",
         "loglevel": "^1.7.1",
diff --git a/src/commands/start.ts b/src/commands/start.ts
index 32e289e..245d4e9 100644
--- a/src/commands/start.ts
+++ b/src/commands/start.ts
@@ -36,7 +36,7 @@ export const builder = (yargs: Argv) => {
     return yargs
         .option("url", {
             describe: "URL of the Ethereum node",
-            default: process.env.URL || "http://localhost:8545",
+            default: process.env.URL,
         })
         .option("wallet", {
             describe: "Filename of JSON wallet file",
@@ -48,7 +48,7 @@ export const builder = (yargs: Argv) => {
         })
         .option("gasPrice", {
             describe: "Gas price predictor strategy",
-            default: process.env.GAS_PRICE_PROVIDER || "eth-provider",
+            default: process.env.GAS_PRICE_PROVIDER,
             demandOption: true,
             choices: gasPriceProviderTypes,
         })
diff --git a/src/config.ts b/src/config.ts
index ad1415b..0c1d81f 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -11,15 +11,26 @@
 
 import { parseEther } from "@ethersproject/units";
 
-export const TIMEOUT = 24 * 60 * 60 * 1000;
-export const RETRY_INTERVAL = 10000;
-export const POLLING_INTERVAL = 30000;
-export const CONFIRMATIONS = 1;
-export const CONFIRMATION_TIMEOUT = 10 * 60 * 1000; // 10 minutes
-export const GAS_LIMIT_MULTIPLIER = 160;
-export const GAS_PRICE_MULTIPLIER = 160;
-export const BALANCE_THRESHOLD = parseEther("0.05");
-export const GAS_STATION_API_CHAIN_ID = 1;
-export const GAS_STATION_API_URL =
-    "https://ethgasstation.info/json/ethgasAPI.json";
-export const GAS_STATION_API_REQUEST_TIMEOUT_MS = 10000;
+export const TIMEOUT = parseInt(<string>process.env.TIMEOUT);
+export const RETRY_INTERVAL = parseInt(<string>process.env.RETRY_INTERVAL);
+export const POLLING_INTERVAL = parseInt(<string>process.env.POLLING_INTERVAL);
+export const CONFIRMATIONS = parseInt(<string>process.env.CONFIRMATIONS);
+export const CONFIRMATION_TIMEOUT = parseInt(
+    <string>process.env.CONFIRMATION_TIMEOUT
+);
+export const GAS_LIMIT_MULTIPLIER = parseInt(
+    <string>process.env.GAS_LIMIT_MULTIPLIER
+);
+export const GAS_PRICE_MULTIPLIER = parseInt(
+    <string>process.env.GAS_PRICE_MULTIPLIER
+);
+export const BALANCE_THRESHOLD = parseEther(
+    <string>process.env.BALANCE_THRESHOLD
+);
+export const GAS_STATION_API_CHAIN_ID = parseInt(
+    <string>process.env.GAS_STATION_API_CHAIN_ID
+);
+export const GAS_STATION_API_URL = process.env.GAS_STATION_API_URL;
+export const GAS_STATION_API_REQUEST_TIMEOUT_MS = parseInt(
+    <string>process.env.GAS_STATION_API_REQUEST_TIMEOUT_MS
+);
diff --git a/src/env.ts b/src/env.ts
new file mode 100644
index 0000000..ece9fa5
--- /dev/null
+++ b/src/env.ts
@@ -0,0 +1,13 @@
+// Copyright 2020 Cartesi Pte. Ltd.
+
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
+// this file except in compliance with the License. You may obtain a copy of the
+// License at http://www.apache.org/licenses/LICENSE-2.0
+
+// Unless required by applicable law or agreed to in writing, software distributed
+// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+// CONDITIONS OF ANY KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations under the License.
+
+import { config } from "dotenv";
+config();
diff --git a/src/index.ts b/src/index.ts
index c7d878e..ee31ed8 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -10,6 +10,7 @@
 // CONDITIONS OF ANY KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations under the License.
 
+import "./env";
 import log from "loglevel";
 import chalk from "chalk";
 import prefix from "loglevel-plugin-prefix";
diff --git a/test/setup.ts b/test/setup.ts
new file mode 100644
index 0000000..3d56acb
--- /dev/null
+++ b/test/setup.ts
@@ -0,0 +1,12 @@
+// Copyright 2020 Cartesi Pte. Ltd.
+
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
+// this file except in compliance with the License. You may obtain a copy of the
+// License at http://www.apache.org/licenses/LICENSE-2.0
+
+// Unless required by applicable law or agreed to in writing, software distributed
+// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+// CONDITIONS OF ANY KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations under the License.
+
+import "../src/env";
diff --git a/yarn.lock b/yarn.lock
index 949058a..5e92caa 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3548,6 +3548,11 @@ domutils@^2.5.2, domutils@^2.6.0, domutils@^2.7.0:
     domelementtype "^2.2.0"
     domhandler "^4.2.0"
 
+dotenv@^10.0.0:
+  version "10.0.0"
+  resolved "https://registry.yarnpkg.com/dotenv/-/dotenv-10.0.0.tgz#3d4227b8fb95f81096cdd2b66653fb2c7085ba81"
+  integrity sha512-rlBi9d8jpv9Sf1klPjNfFAuWDjKLwTIJJ/VxtoTwIR6hnZxcEOQCZg2oIL3MWBYw5GpUDKOEnND7LXTbIpQ03Q==
+
 dotignore@~0.1.2:
   version "0.1.2"
   resolved "https://registry.yarnpkg.com/dotignore/-/dotignore-0.1.2.tgz#f942f2200d28c3a76fbdd6f0ee9f3257c8a2e905"