External builders with enterprise plan or above are allowed to submit blocks to bloXroute max profit relay and regulated relay. bloXroute relay supports Relay API spec, and block builders can submit blocks to the /relay/v1/builder/blocks endpoint. Builder must include their authorization header (from bloXroute account portal) in the http request header, like -H "Authorization: <YOUR-AUTHORIZATION-HEADER>" , when submitting blocks to bloXroute relay.
Builders with Enterprise plan or above can start submitting blocks to bloXroute now! Builders with Ultra tier will be able to get from bloXroute MEV bundles and private transactions to be added to their blocks.