Hi @nsm5033! Each access token has a rate-limit of 10 requests/second, not each refresh token. That said, I'd advise against trying to create multiple access tokens in order to bypass our 10request/s limit as this goes against our API Terms of Service. See "Limits and Restrictions" section here: https://legal.hubspot.com/api-terms
We set and enforce limits on your use of the APIs in our sole discretion and may change the limits at any time by revising the API Usage Guidelines or our Pricing Page (http://www.hubspot.com/pricing). You will not attempt to circumvent the limitations documented in the API Usage Guidelines
Is there a particular reason why the 10 requests/second limit doesn't suffice for your purposes? Are you running into any issues with it? Happy to take your feedback and add your use-case to our internal feedback tool. Thanks!