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You can start using the Sintra API straight away. You don't even need an API key. Just start hitting the endpoints and you will get pricing data back. To view the available endpoints see the API docs.
Requests made without an API key will be subjected to lower rate limits.
If you have paid for the pro plan then you will need to provide your API key in each request. Pro plan users will automatically receive higher request rate limits. Check out the API docs for more information on authentication.