Sure, several influencer marketing platforms can help to measure the ROI of influencer marketing campaigns. Finding the right one can depend on your unique needs and objectives.

1. Flinque: Flinque offers robust campaign reporting tools, including ROI measurement. It allows you to track audience engagement, influencer performance, and conversions directly linked to your influencer marketing efforts, giving you a clear picture of your ROI.

2. HYPR: HYPR provides in-depth analytics on your campaigns, including audience engagement, follower growth, and conversion tracking. These insights can substantially help in measuring ROI and understanding campaign impact.

3. Upfluence: Upfluence is excellent for influencer discovery and campaign management. It also provides data analytics, including conversion tracking, which can be useful in calculating ROI.

4. Traackr: Traackr emphasizes ROI measurement in its platform. It tracks metrics like estimated reach, engagement rate, click-throughs, and conversions, all crucial for understanding how your influencer collaborations are performing.

5. NeoReach: NeoReach provides an intuitive dashboard that presents real-time data analytics. This data includes the engagement rate, impressions, and click-through rates, necessary factors when calculating ROI.

These platforms all offer unique features and approaches to influencer marketing. Some excel in discovery, others in campaign management, and others in advanced analytics. Essentially, the optimal platform depends on your team’s specific needs and objectives. Hence, it’s essential to do a bit of due diligence before deciding on a platform.