matchmaticians
Matchmaticians allows users to ask or answer math questions. The questioner chooses a deadline and offers a bounty for receiving a complete answer before the deadline. The user who accepts to answer the question is solely responsible for answering the question before the deadline. Funds will be put on hold in both the questioner's and the answerer's Matchmaticians accounts and will be released once the answer is reviewed and accepted by the questioner. After the solution is received, the questioner has seven days to review, accept or dispute it. If the answer gets disputed, it will be reviewed by a Matchmaticians judge. If the judge decides that the solution is not 100% complete, then the questioner will be partially or fully refunded and even compensated, depending on the judge's evaluation of the quality of the answer. See the review process section below for more details.