Note that all Bitcoin transfers are irreversible and you cannot cancel a Bitcoin transfer once you have confirmed the transfer. To contact the support, go to the support and open a ticket. Please provide all relevant information, including your poloniex us username and transaction credentials for all associated deposits. Although we do not give any assurance or guarantee as to the speed of reaction, we will come back to you as soon as possible. Circle may, at its discretion, set limits on the number of API calls you can make, for example, to maintain market stability and integrity. You recognize and accept that if you exceed these limits, Circle may moderate your activities or allow you to access the API (or another API offered by Circle Group) at your discretion. Circle may suspend or terminate your access to the API immediately without notice if it believes that you are violating the terms and conditions of this Agreement (including Section 22) or any other agreement that may exist between you and Circle in relation to the use of the API. Subject to your compliance with this Agreement and other agreements between you and Circle in connection with your use of the API, Circle hereafter grants you a limited, revocable, non-exclusive, non-transferable, non-transferable, under-conceded license that uses the API exclusively for the purpose of trading poloniex US. You agree not to use the API or data provided via the API for other commercial purposes. You use the API at your own risk and Circle is not responsible for the actions you perform based on the API.
The agreement lists 11 15 “Prohibited Transactions” in which it can act against users` accounts and freeze its USDCs. You are responsible for the privacy and security of all account names, user IDs, passwords, personal identification numbers (NPIs) and mobile unlock codes (the “security details”) that you use to access services.