Go to the DocuSign Developer Center → Documentation and in the "Certification Documentation" section, see the PDF under the heading "Security and Design Requirements"
From the doc:
DocuSign has imposed a default 1,000 API call per hour limit for each account. This limit ensures resource availability for all account holders, while reducing the chances of a denial of service (DOS) attack. Exceeding this limit will result in your API calls receiving an exception for up to 60 minutes. However, the call limit is the default setting and not a service limitation. When evaluating your integration, if you feel the API call per hour limit will restrict your application's usage based on anticipated volumes, please contact DocuSign to discuss further options. Additionally, your API certification review involves verifying that you do not exceed 1 status request per unique envelope per 15 minutes for polling compliance for the following methods:
SOAP API : RequestStatus, RequestStatusEx, RequestStatuses, RequestStatusesEx, RequestPDF and RequestDocumentPDFs.
REST API : GET /accounts/{accountId}/envelopes
According to the Certification document, these are the only limited endpoints for each API.
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