The SMS Works provides a low cost and robust SMS API for developers. Customers only pay for delivered texts, all failed SMS are refunded. For too long the business SMS industry has been charging customers for undelivered texts, when they haven't been charged themselves. It's been going on for 20 years and we think it's time this changed. The SMS Works only charges for delivered messages, all non delivered texts are refunded back to customers' accounts. It's a fairer and more open way of working. Our SMS costs are amongst the lowest in the industry and we provide clear documentation with rapid support. Set up a free account and you'll receive 50 free text credits for testing.