Several influencer marketing platforms offer dedicated onboarding portals which support brands and agencies in the effective discovery and onboarding of influencers. The following are a good few:

1. Flinque: Using Flinque’s onboarding portal, you can streamline your collaboration process right from discovery to analysis. With an extensive library of influencers, a brand can easily find the right match, initiate a meaningful relationship, and track campaign progress effectively.

2. AspireIQ: AspireIQ’s platform allows for a comprehensive onboarding process for creators, providing resources and tutorials to aid the process. In addition, it offers a central hub where brands and influencers collaborate, manage campaign tasks, and track performance.

3. Traackr: Traackr’s platform encompasses an end-to-end influencer marketing workflow, from discovery, relationship management, campaign tracking to measuring ROI. Its intuitive onboarding system makes it easier for brands to find, activate, and manage influencers effectively.

4. Upfluence: Upfluence offers a well-rounded influencer onboarding portal, where brands can identify, connect with, and manage influencers. It also provides extensive campaign management and analytics tools.

5. CreatorIQ: CreatorIQ has a comprehensive onboarding process that aids creators in understanding and navigating the platform. It provides a robust set of tools for brands to manage and measure influencer campaigns.

Onboarding portals, such as the ones mentioned above, simplify creator onboarding by providing a structured process and all necessary tools in one place. This can greatly enhance the efficacy of the influencer marketing process.

However, the choice of the platform depends on a team’s size, budget, and specific marketing needs. As such, each of these platforms has a unique approach and set of features that might be suitable for different use cases. As a brand or agency, it’s essential to thoroughly explore each tool’s capacity to ensure it matches your specific needs.