Getting approved for Google Ad Exchange (AdX) requires meeting specific criteria and following guidelines set by Google. AdX is a premium ad exchange that is more selective in approving publishers. Here are some steps to increase your chances of getting AdX approval:

1. Meet Google AdX Eligibility Requirements: Google AdX has specific eligibility requirements, which typically include:

- Significant website traffic: AdX generally requires a minimum threshold of website traffic, usually measured in monthly pageviews.
- Quality content: Your website should have high-quality and original content that adheres to Google's content policies.
- Ad policy compliance: Ensure that your website complies with Google's ad policies, including avoiding prohibited content, following ad placement guidelines, and not engaging in deceptive practices.
- Website structure and user experience: Have a well-structured website with clear navigation, good user experience, and a professional design.
- Original language content: AdX generally prefers websites with original content in supported languages.

2. Implement Google AdSense: It's recommended to start with Google AdSense, as it serves as a stepping stone to AdX. AdSense allows you to monetize your website with Google ads and provides a foundation for demonstrating your compliance with Google's policies.

3. Comply with Google Policies: Familiarize yourself with and adhere to Google's ad policies, including content policies, ad placement policies, and user safety policies. Ensure your website and content align with these policies to maintain a good standing with Google.

4. Optimize Website Performance: Focus on optimizing your website's performance by ensuring fast loading times, mobile responsiveness, and a smooth user experience. Use techniques such as caching, image optimization, and minimizing unnecessary code to improve website performance.

5. Build Quality Traffic: Focus on driving quality organic traffic to your website through SEO techniques, content marketing, social media promotion, and other legitimate means. Increasing your website's traffic and audience engagement demonstrate its value to potential advertisers.

6. Improve Website Design and User Interface: Enhance the design, layout, and user interface of your website.

7. Provide Unique and Valuable Content: Create original and valuable content that is relevant to your target audience. Offer unique perspectives, in-depth information, or specialized knowledge to differentiate your website from others in your niche.

8. Monitor Website Performance: Regularly monitor your website's performance using tools like Google Analytics to understand your audience, track engagement metrics, and identify areas for improvement.

9. Apply for AdX through Google Ad Manager: Once you meet the eligibility requirements and have established a strong AdSense account, you can apply for AdX through Google Ad Manager. Google Ad Manager is a comprehensive platform that allows publishers to manage their ad inventory and monetization.

10. Be Patient: The approval process for AdX can take time, and not all applications are successful. Google evaluates each application individually based on various factors. If your application is not initially approved, take the feedback provided and make the necessary improvements before reapplying .

Remember that AdX approval is at Google's discretion, and meeting the eligibility criteria does not guarantee approval. It's important to comply with Google's policies, create a quality website, and continuously improve your website's performance to increase your chances of AdX approval.