It should be stated before sending coins that there is a minimum limit of transaction - if there is one.
https://www.circle.com/en/legal/intl-user-agreement
13. Right to Suspend or Delay Transactions
We reserve the right to change, suspend, or discontinue any aspect of the Services at any time, including hours of operation or availability of any feature, without notice and without liability. We may decline to process any deposit or withdrawal without prior notice and may limit or suspend your use of one or more Services at any time, in our sole discretion. Suspension of your use of any of the Services will not affect your rights and obligations pursuant to this Agreement. We may, in our sole discretion, delay deposits or withdrawals if we believe the transaction is suspicious, may involve fraud or misconduct, violates applicable laws, or violates the terms of this Agreement.
14. Insufficient Funds
If at any point your account has a negative balance (as a result of a deposit being rejected or reversed or otherwise), Circle may deduct amounts you owe from the balance of your account from funds you subsequently deposit or receive into your account or from any other Circle account that is held in your name. If Circle requests that you complete a deposit in order to resolve a negative balance issue and you fail to do so, you authorize Circle to initiate a deposit in the amount of such deficiency from your linked bank account, credit card, or debit card (if applicable). If you have more than one account, Circle may set off the negative balance in one account by using any balance that you hold in your other accounts.