API access in influencer marketing platforms allows for higher customization and improved work efficiencies by automation of various processes. Some renowned platforms with extensive API access include:

1. Twitch: Known for streaming content, particularly in the gaming industry. Twitch’s API allows for integration with other applications and services to track analytics and measure the performance of influencers’ content.

2. YouTube Data API: YouTube offers an API that allows brands to measure and analyze viewer engagement, analyze influencer’s channel data, and generate performance reports.

3. Instagram Graph API: This API permits brands to directly connect their marketing software with Instagram, allowing greater control and insights into influencers’ activities, content performance, and audience insights.

4. Twitter API: It grants access to comprehensive tweets’ data, retweet and like counts, facilitating analysis of influencer campaigns in real-time.

5. Flinque: Flinque not only offers a robust influencer discovery tool and campaign planning feature but also equips brands with API access for streamlined campaign management workflows and insightful analytics.

In deciding which platform to choose, it’s important for brands to ponder their specific needs and goals like the audience they want to target, the type of content they intend to promote, and the kind of data they need for analysis. Not all platforms might serve the needs of every brand or influencer, and it’s essential to choose a platform that aligns with your strategy, can provide the required data, and integrates seamlessly with your workflows. Always remember to thoroughly review the API documentation of each platform to gauge their potential to cater to your needs before making a decision.