Replace money transfer services with crowd money changers

Consider the following scenario:

1. M needs to transfer money from a bank account in Malaysia to a bank account in Thailand
2. T needs to transfer money from a bank account in Thailand to a bank account in Malaysia
3. They both go to a bank/Western Union to make the transfer and get charged service fees and exchange rate costs

Consider an alternative scenario:

1. M needs to transfer money from a bank account in Malaysia to a bank account in Thailand
2. T needs to transfer money from a bank account in Thailand to a bank account in Malaysia
3. M transfers money to T's bank account in Malaysia
4. T transfers money to M's bank account in Thailand
5. That would be ideal if the amount transferred match exactly
6. Enter X who has accounts in Malaysia and Thailand
1. M transfers money to X's account in Malaysia
2. T transfers money to X's account in Thailand
3. X transfers money to M's account in Thailand
4. X transfers money to T's account in Malaysia
7. X provides two service:
1. Escrow
2. Market matching

Essentially, I should be able to transfer money between Thailand and Malaysia cheaply.