# Data Availability Servers​

Sanko Data Availability Committee members run Data Availability Server (DAS) software. The DAS exposes two key APIs: the REST API, and the Sequencer API.

* The REST API is a RESTful HTTP(S) based protocol that allows data blocks to be fetched by hash. This API is fully cacheable, and deployments may use a caching proxy or CDN to increase scale and protect against DoS attacks.
* The Sequencer API is a JSON-RPC interface allowing the Sequencer to submit data blocks to the DAS for storage. Deployments will typically block access to this API from callers other than the Sequencer.


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