Hey, I want to do bulk calls with some personalization to the calls like using the user name, email etc... In Individual calls I can send the user information through "variableValues", so the assistant can use the user information during the call. Searching through the docs, I found that we can't pass "variableValues" in bulk calls. So I am thinking can I make like 100 API requests in 5 seconds? Like doing 100 or more Individual call with personalized user information? I don't care if the calls will be queued it's okay, I just want to know will I hit a rate limit in some point, like doing 10k API calls in 30 sec or something.

You can make 10 concurrent call across your valid account at a time. And you can set dynamic variables for assistant overrides to pass down each of your contacts number and details for personalised calls.

I can help you with any difficulty, let's have a chat now and proceed to your project

I just want to know about API rate limit, is it okay to make +100 API calls in few seconds?

You can send 100+ API calls in seconds, but vapi default 10-call concurrency limit means extra calls will queue or fail unless you batch them or upgrade your plan..