diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..28f0166
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,20 @@
+---
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.2.0
+    hooks:
+      - id: check-executables-have-shebangs
+      - id: check-merge-conflict
+      - id: end-of-file-fixer
+      - id: fix-encoding-pragma
+        args: ['--remove']
+      - id: requirements-txt-fixer
+      - id: trailing-whitespace
+  - repo: https://github.com/psf/black
+    rev: 22.3.0
+    hooks:
+      - id: black
+  - repo: https://github.com/pycqa/isort
+    rev: 5.10.1
+    hooks:
+      - id: isort
diff --git a/README.md b/README.md
index ce7c19a..29b0328 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,32 @@
 # check_trex
-Nagios check for T-Rex miner
+
+Nagios check for T-Rex miner.
+
+# Installation
+
+Using pip:
+
+```
+python3 -m venv venv
+. ./venv/bin/activate
+pip install -r requirements.txt
+```
+
+Using debian package manager:
+
+```
+sudo apt-get install python3-nagiosplugin python3-requests
+```
+
+# Usage
+
+```
+./check_trex --help
+```
+
+# Contributing
+
+```
+pip install pre-commit
+pre-commit run --files check_trex.py
+```
diff --git a/check_trex.py b/check_trex.py
new file mode 100755
index 0000000..de8bb5f
--- /dev/null
+++ b/check_trex.py
@@ -0,0 +1,302 @@
+#!/usr/bin/env python3
+
+import argparse
+import logging
+import sys
+
+import requests
+from nagiosplugin import (Check, Context, Metric, Performance, Resource,
+                          ScalarContext, Summary)
+from nagiosplugin.state import Critical, Ok, Unknown, Warn
+
+logger = logging.getLogger(__name__)
+
+
+def parse_arguments():
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "-v",
+        "--verbose",
+        dest="loglevel",
+        action="store_const",
+        const=logging.INFO,
+        help="Print more output",
+    )
+    parser.add_argument(
+        "-d",
+        "--debug",
+        dest="loglevel",
+        action="store_const",
+        const=logging.DEBUG,
+        default=logging.WARNING,
+        help="Print even more output",
+    )
+
+    parser.add_argument(
+        "--version",
+        dest="show_version",
+        action="store_true",
+        help="Print version and exit",
+    )
+
+    parser.add_argument(
+        "--url",
+        dest="url",
+        type=str,
+        help="API URL of T-Rex miner",
+        default="http://127.0.0.1:4067",
+    )
+
+    parser.add_argument(
+        "--timeout",
+        dest="timeout",
+        type=int,
+        help="Timeout when requesting T-Rex API",
+        default=3,
+    )
+
+    parser.add_argument(
+        "--hashrate-warning",
+        dest="hashrate_warning",
+        type=int,
+        help="Raise warning if hashrate goes below this threshold",
+    )
+    parser.add_argument(
+        "--hashrate-critical",
+        dest="hashrate_critical",
+        type=int,
+        help="Raise critical if hashrate goes below this threshold",
+    )
+    parser.add_argument(
+        "--uptime-warning",
+        dest="uptime_warning",
+        type=int,
+        help="Raise warning if uptime goes below this threshold",
+    )
+    parser.add_argument(
+        "--uptime-critical",
+        dest="uptime_critical",
+        type=int,
+        help="Raise critical if uptime goes below this threshold",
+    )
+    parser.add_argument(
+        "--paused-warning",
+        dest="paused_warning",
+        action="store_true",
+        help="Raise warning when T-Rex is paused",
+    )
+    parser.add_argument(
+        "--paused-critical",
+        dest="paused_critical",
+        action="store_true",
+        help="Raise critical when T-Rex is paused",
+    )
+    parser.add_argument(
+        "--temperature-warning",
+        dest="temperature_warning",
+        type=int,
+        help="Raise warning if temperature goes over this threshold",
+        default=70,
+    )
+    parser.add_argument(
+        "--temperature-critical",
+        dest="temperature_critical",
+        type=int,
+        help="Raise critcal if temperature goes over this threshold",
+        default=90,
+    )
+    parser.add_argument(
+        "--memory-temperature-warning",
+        dest="memory_temperature_warning",
+        type=int,
+        help="Raise warning if memory temperature goes over this threshold",
+        default=90,
+    )
+    parser.add_argument(
+        "--memory-temperature-critical",
+        dest="memory_temperature_critical",
+        type=int,
+        help="Raise critcal if memory temperature goes over this threshold",
+        default=110,
+    )
+    args = parser.parse_args()
+    return args
+
+
+def setup_logging(args):
+    logging.basicConfig(format="%(levelname)s: %(message)s", level=args.loglevel)
+
+
+def show_version():
+    print("1.0.0")
+
+
+class BelowThresholdContext(Context):
+    def __init__(self, name, warning=None, critical=None):
+        super().__init__(name)
+        self.warning = warning
+        self.critical = critical
+
+    def evaluate(self, metric, resource):
+        if self.critical and metric.value <= self.critical:
+            return self.result_cls(Critical, f"{metric.value}<={self.critical}", metric)
+        elif self.warning and metric.value <= self.warning:
+            return self.result_cls(Warn, f"{metric.value}<={self.warning}", metric)
+        else:
+            return self.result_cls(Ok, None, metric)
+
+    def performance(self, metric, resource):
+        return Performance(
+            metric.name,
+            metric.value,
+            metric.uom,
+            self.warning,
+            self.critical,
+            metric.min,
+            metric.max,
+        )
+
+
+class BooleanContext(Context):
+    def __init__(self, name, expected=True, warning=False, critical=False):
+        super().__init__(name)
+        self.expected = expected
+        self.warning = warning
+        self.critical = critical
+
+    def evaluate(self, metric, resource):
+        if not metric.value is self.expected:
+            result_type = Ok
+            if self.critical:
+                result_type = Critical
+            elif self.warning:
+                result_type = Warn
+            return self.result_cls(
+                result_type, f"{metric.name} is not {self.expected}", metric
+            )
+        else:
+            return self.result_cls(Ok, None, metric)
+
+
+class Trex(Resource):
+    def __init__(self, url, timeout):
+        self.url = url
+        self.timeout = timeout
+
+    def probe(self):
+        r = requests.get(f"{self.url}/summary", timeout=self.timeout)
+        r.raise_for_status()
+        data = r.json()
+
+        logger.debug("Response:")
+        logger.debug(data)
+
+        metrics = []
+
+        if "hashrate" in data:
+            hashrate = data["hashrate"]
+            logger.debug(f"Hashrate is {hashrate}")
+            metrics.append(Metric("hashrate", hashrate, context="hashrate"))
+
+        if "success" in data:
+            success = bool(data["success"])
+            if success:
+                logger.debug("T-Rex is successfully started")
+            else:
+                logger.debug("T-Rex is not successfully started")
+            metrics.append(Metric("success", success, context="success"))
+
+        if "paused" in data:
+            paused = bool(data["paused"])
+            if paused:
+                logger.debug("T-Rex is paused")
+            else:
+                logger.debug("T-Rex is not paused")
+            metrics.append(Metric("paused", paused, context="paused"))
+
+        if "uptime" in data:
+            uptime = data["uptime"]
+            seconds = "seconds" if uptime > 1 else "second"
+            logger.debug(f"Uptime is {uptime} {seconds}")
+            metrics.append(Metric("uptime", uptime, context="uptime"))
+
+        for gpu in data.get("gpus"):
+            name = gpu["name"]
+            id = gpu["gpu_id"]
+
+            if "temperature" in gpu:
+                temperature = gpu["temperature"]
+                logger.debug(f"Temperature of {name} ({id}) is {temperature}C")
+                metrics.append(
+                    Metric("temperature", temperature, context="temperature")
+                )
+
+            if "memory_temperature" in gpu:
+                temperature = gpu["memory_temperature"]
+                logger.debug(
+                    f"Memory temperature of {name} ({id}) is {memory_temperature}C"
+                )
+                metrics.append(
+                    Metric(
+                        "memory_temperature",
+                        memory_temperature,
+                        context="memory_temperature",
+                    )
+                )
+
+        return metrics
+
+
+class TrexSummary(Summary):
+    def problem(self, results):
+        return ", ".join(
+            [
+                f"{result.metric.name} {result.state}: {result.hint}"
+                for result in results
+                if str(result.state) != "ok"
+            ]
+        )
+
+
+def main():
+    args = parse_arguments()
+    setup_logging(args)
+
+    if args.show_version:
+        show_version()
+        return
+
+    try:
+        check = Check(
+            Trex(url=args.url, timeout=args.timeout),
+            BooleanContext("success", expected=True),
+            BooleanContext(
+                "paused",
+                expected=True,
+                warning=args.paused_warning,
+                critical=args.paused_critical,
+            ),
+            BelowThresholdContext(
+                "hashrate",
+                warning=args.hashrate_warning,
+                critical=args.hashrate_critical,
+            ),
+            BelowThresholdContext(
+                "uptime", warning=args.uptime_warning, critical=args.uptime_critical
+            ),
+            ScalarContext(
+                "temperature",
+                warning=args.temperature_warning,
+                critical=args.temperature_critical,
+            ),
+            TrexSummary(),
+        )
+        check.main()
+    except Exception as err:
+        print(f"Failed to execute check: {str(err)}")
+        logger.debug(err, exc_info=True)
+        sys.exit(Unknown.code)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..74178f5
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,6 @@
+certifi==2021.10.8
+charset-normalizer==2.0.12
+idna==3.3
+nagiosplugin==1.3.3
+requests==2.27.1
+urllib3==1.26.9