Two Ways to Calais

Since its release in early 2008 we've been, to put it simply, amazed at the level of interest that the OpenCalais initiative has generated. Much of that interest has been from individual developers, but we've also talked to and worked with a number of companies ranging from start-ups to Fortune 100 organizations that want to use OpenCalais capabilities as a core component of their commercial services. 

And we're fine with that. The OpenCalais Terms of Service specifically allow it to be used for commercial enterprises, and OpenCalais provides no-cost services for up to 50,000 transactions per day per user. But, if you're building a business on it, that simply may not be enough. You may need a guaranteed service level, you may need significantly higher transaction volumes or you may require a very high-security solution. That's where our new commercial offerings enter the picture.

There are now two ways to Calais...

The OpenCalais Service

The basic OpenCalais service remains the same as ever. It contains the full OpenCalais functionality and is available for commercial or non-commercial use. Users are allowed to submit up to 50,000 transactions per day at a maximum rate of four transactions per second. For academic or other similar users we evaluate raising these limits on a case-by-case basis.


Our commercial services provide the same functionality as OpenCalais but with a production-strength twist. The service provides a high-performance SLA, a daily transaction limit of 100,000 transactions and an enhanced 20 transactions per second rate. Additional volume blocks up to maximum of 2,000,000 transactions per day are available. ProfessionalCalais meets  needs unique to larger-scale publishers. ProfessionalCalais is available as an annual contract. To get the conversation started, drop us a note at

Got Questions?

Check out the FAQs for more details.