Radar Agent Overview

The Radar Agent bridges BlazeMeter API Monitoring to private APIs not available over the public internet. By running the agent within your infrastructure, BlazeMeter API monitors can run against endpoints that are otherwise inaccessible to the cloud agents. The agent is particularly useful if you are looking to test or monitor an API in the following situations:

  • Monitoring private or internal APIs that reside behind a firewall.
  • Testing APIs on localhost or in a private staging environment.
  • Accessing APIs that require a fixed client IP address (IP allowlisting).

Use of the agent requires a trial or paid subscription.

A Radar Agent is a wholly separate installation apart from a Private Location. Private Location serves as an on-premise agent for running Functional Tests or Performance Tests. The Radar Agent serves as an on-premise agent for running API Monitoring tests.

How it Works

Monitoring and testing private APIs with API Monitoring uses a hybrid on-premises approach. The agent runs on a host within your infrastructure but test data is managed and stored in the BlazeMeter cloud. Using the API Monitoring dashboard, you have a single interface for defining tests, viewing results, configuring notifications and enabling 3rd-party integrations.

All communication from the agent to the BlazeMeter cloud is made over outbound requests to the BlazeMeter API via HTTPS on port 443. The agent requests work to be processed and sends back results over a TLS-encrypted connection and is not externally addressable.

How API Monitoring Radar Agent works

Download the Agent

Select an operating system to download the latest agent:

For information on previous releases, see Radar Agent Changelog.

Recommended Requirements

As a general guideline, we recommend a machine with:

  • 4-core CPUs or higher
  • 4GB RAM or higher

Run the Agent

After downloading the agent, extract the executable from the .zip file so that you can run it from your command line.

Note: The first time you run the agent, you must use the --token flag to ensure the agent authenticates with an API Monitoring token.

If you do not yet have a token, follow these steps to create one:

  1. Log in to BlazeMeter and navigate to the API Monitoring tab.
  2. Click the Profile and Account Settings icon in the top right corner.
  3. From the drop-down list, select Personal Information.
    profile account settings
  4. In the menu on the left, click Applications.
  5. Click Create Application.

    create app

  6. Name your app. You do not necessarily need a real application, as this app may simply serve as a placeholder for generating your token, so consider naming for example "API Monitoring Agent Token".
  7. The app requires a website URL and callback URL. Since this can be a placeholder app, you may enter any URL you like, even completely imaginary URLs.
  8. Click Create Application.
  9. On the next page, scroll down to view your new Personal Access Token.

You may wonder why it is necessary to create a new application. The API Monitoring feature typically requires a token be associated with an application for general use cases, but in this context, we simply need a token to authenticate the agent with, so creating a fake "dummy" application in order to generate one will suffice.

Once you have a token, run your agent for the first time:

Linux and macOS

$ ./runscope-radar --token=your_personal_access_token


C:\> runscope-radar.exe --token=your_personal_access_token

If you are a member of multiple API Monitoring teams, then you will next be prompted to select which team to associate your new agent with.

Once authenticated, you can save a configuration file to be used for subsequent runs of the agent (without having to pass your token each time). To launch the agent with a specific configuration file, use the -f command line option. This is the recommended way to start the agent.

Linux and macOS

$ ./runscope-radar -f radar.conf


C:\> runscope-radar.exe -f radar.conf

If you examine the contents of this configuration file, you will find that it contains various parameters, including the API token you provided earlier, along with a unique Agent ID and the Team ID the agent is associated with.

With the agent running, you're now ready to use it for your tests.

Using the Agent for Test Runs

After downloading and launching the agent, head over to the API test editor for the test you want to use the agent for. If everything is working correctly, the agent will appear as an option in the Locations section of the environment settings:

img docs toggle testing agent

If you are testing an API across multiple realms (for example local, staging, prod), you may want to selectively enable the agent per-environment. The agent can also be enabled in a shared environment used across tests within a single bucket.

Tip: You can view the version of the radar agent you're running by going into test Steps > Request > Headers.

Command Line Flags / Configuration File Reference

You can specify the following parameters in your configuration file, or on the command line, when executing the agent. The configuration file will override the same parameters used in the command line.

Restriction: Local client authentication configuration options will only be used if there is no client authentication enabled on the environment or request. If client authentication has been enabled on the environment or request, it will override any local client authentication configuration options. Refer to Environment Headers and Authentication for more information.

--agent-id string Agent UUID.
--api-host string API host base URL.
--cafile string CA certificate file.
--cert string Client certificate file (PEM-encoded) for two-way HTTPS authentication.
-f, --configfile string Start the agent with the configuration contained within the specified configuration file.
--debug Enable debugging web server.

boolean Default is "false" (DNS pre-checks enabled). Set to "true" to disable DNS pre-checks.
--disconnect-timeout string Disconnect timeout. Default: "5".
-h, --help Show all available flags. Only works on the cli.
--ignore-env-proxy Ignore HTTP_PROXY and HTTPS_PROXY environment variables. Requests to api.runscope.com will still use the proxy.
--key string Client key file (PEM-encoded) for two-way HTTPS authentication.
-l, --logfile string Write logfile to an external file.
--name string The name of the agent to be displayed in the API Monitoring UI Locations menu.
--pass string Passphrase for client key file.
--pidfile string Pidfile.
--team-id string Team UUID.
--threads integer Number of worker threads. Default: 10.
--timeout integer Connection idle timeout. Default: 20.
-t, --token string API Monitoring Auth Token.
--use-system-certs   Use system/OS provided certificates for HTTPS authentication.
-v, --verbose Log more information.
--verify-ssl boolean Verify SSL.
--version Get version number. Only works on the cli.
--web-host string Web host base url. Default: https://www.runscope.com.


Running the agent in verbose mode, and ignoring env proxy variables:

$ ./runscope-radar -f radar.conf -v --ignore-env-proxy

Configuration file with increased threads value to support a higher amount of requests, and ignoring environment proxy variables:



In the event that the Radar Agent is down or otherwise not available for any reason, BlazeMeter will expire any test executing on it and immediately set a status of "Remote Agent Expired" so that the user is alerted to the problem. Automated email and/or Slack notifications may be sent as well. Please refer to the Handling Radar Agent Availability Issues guide for our recommended best practices.

All tests marked with the "Remote Agent Expired" status will be colored orange in the Dashboard, Latest Test Results, and Test Result progress bars in the GUI.

While an on-premise Radar Agent is down and until said agent comes back up (is available again), no scheduled test that tries to run on it will count toward any metrics calculation, nor will it count toward the owning team's test count.

If you run into any issues while setting up or running the agent, such as difficulty connecting to api.runscope.com, or intermittent test errors, check out the following troubleshooting articles: