Block.io API offers a secure wallet and payment service for transacting the three most common cryptocurrencies (Bitcoin, Doge, & LiteCoin). Their service is hosted without fees. Their HTTP request API uses the keys associated with each personal cryptocurrency account, to return balances, conduct withdrawals and account maintenance, and return user IDs & addresses associated with a specific account.
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The Block.io PHP SDK by Block.io can access payment features from the API, allowing bitcoin as a currency method. A getting started guide presents how to process transactions, create wallets for users, and use green addresses.