As per doc, quote
There is an API rate limit of approximately 10 calls per second to api.particle.io from each public IP address. This limit is the total number of requests from a public IP address and does not depend on the access token or API endpoint used
What does ‘each public IP address’ mean? One particle device? In my opinion this section needs more elaboration for reader to understand why suddenly ‘public IP address’ comes into context here.