Yes, they're definitely a competitor, but with important differences. As far as I know, they're more about full-featured "API portals" (usually for complex yet free APIs). WebServius is more about enabling very quick experimentation with simple and lightweight "software components in the cloud" (with a focus on direct per-API-call monetization).<p>Practical differences:
- WebServius has instant integration (connecting an API to us is literally just typing in a URL)
- WebServius is free for low-traffic free APIs
- We have per-call API billing through PayPal built in (as far as I know, Mashery doesn't, though I may not have all the facts on them of course)