fix API URL

[spiderxm]

Description

fix the API URL, which was hardcoded

Steps to Reproduce

Related Issue

#351

Motivation and Context

Reviewers

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Other

Checklist

• [x] I have followed the Contributor Guidelines.
• [x] The code has been thoroughly tested in my local development environment with flake8 and pylint.
• [x] The code is Python 3 compatible.
• [x] The code follows the PEP8 styling guidelines with 4 spaces indentation.
• [x] This Pull Request relates to only one issue or only one feature
• [x] I have referenced the corresponding issue number in my commit message
• [x] I have added the relevant documentation.
• [x] My branch is up-to-date with the Upstream master branch.