CoinPayments is a cloud wallet solution that offers an easy way to integrate a checkout system for numerous cryptocurrencies. Coinpayments now also offers coin conversion via Shapeshift.io.
An extension to the ERC-20 standard token, which allows tokens to be put on hold. This guarantees a future transfer and makes the held tokens unavailable for transfer in the mean time. Holds are similar to escrows in that are firm and lead to final settle