Keepa Tokens
Keepa uses a token bucket algorithm to prevent it's api from becoming overwhelmed. This will set a limit on how many requests you can make to their api over a set amount of time.

Pricing / Plans

"The plans differentiate by the number of tokens generated per minute. For example: With a single token you can retrieve the complete data set for one product. Unused tokens expire after one hour. You can find more information on how our plans work in our documentation."
basic subscription generates 5 tokens/minute (subject to change)
https://keepa.com/#!api > Select "Pricing Plans" for detailed token refill rates.
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