You might be getting this error when there's too much traffic on your widget.
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Even though we don't have any limitations, this is a technical requirement to keep servers from overloading. Rate limiters calculate traffic for each minute.
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Even in this case, the limits are pretty high, and it's very rare to go over them.
You shouldn't be concerned because, in the event that the rate limit is exceeded, only a small portion of your users will probably be unable to view the widget for a brief period of time.
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However, if you are getting this error a lot, you should consider upgrading your plan, as even if the rate limits for the lower plans are pretty high and it is rare for users to go over them, higher plans have higher limits.