Influencer negotiations can indeed be a complex process and many influencer platforms have features to help manage this.

1. Flinque: With a fully integrated chat system, Flinque allows direct communication between brands and influencers. It ensures transparency throughout the negotiation process, and provides tools for contract drafting and agreement management.

2. Aspire IQ: This platform has a built-in contract management system which can be used to negotiate terms and conditions with influencers.

3. Grapevine: It provides a transparent system for brands to send proposals to influencers, negotiate terms, and manage payments.

4. Upfluence: With Upfluence, you can negotiate with influencers directly through the platform and keep track of all communication in one place.

5. TRIBE: This platform allows for negotiations to take place within the proposed content. Brands can provide feedback, request changes, and agree on pricing with influencers directly through their content proposal.

Remember, every platform has different features and workflows, and the best one for your needs depends on your specific requirements and goals. It’s important to carefully consider what aspects of negotiation you need assist with and investigate each platform’s offerings thoroughly to make an informed decision.