Yes, there are several influencer marketing platforms where brands can post campaigns directly and allow influencers to apply. This model of ‘inbound’ influencer marketing can be beneficial as it allows influencers to engage with the brands they love, potentially leading to more authentic and effective partnerships.

1. Flinque: It allows brands to post campaigns directly, inviting influencers to submit their applications. Flinque specializes in deep data analytics, helping you assess the performance of campaigns and measure your ROI more accurately.

2. AspireIQ: Known for its Connect Marketplace, where brands can post initiatives and influencers have the freedom to apply if they believe there’s a good fit.

3. Heepsy: Not only can brands post campaigns, they can also search through the database of influencers, filtering by platform, category, engagement rate, etc.

4. Upfluence: It has a unique self-serve feature where brands can post campaigns and influencers can apply. They also provide live-tracking of campaigns.

The choice of platform significantly depends on your marketing team’s specific needs. For instance, if detailed campaign ROI tracking is your primary concern, then a platform like Flinque with its focus on in-depth analytics could be beneficial. However, for simple campaign posting and a rapid number of responses, a platform like AspireIQ might be sensible. Always assess the platform considering your brand’s unique needs and the tools/resources your team requires to manage influencer relationships effectively.