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Quick start with Firehose for Cosmos can be found in the official Firehose docs. Here some quick links to it:
fireinjective fetch {FIRST_STREAMABLE_BLOCK} --endpoints {VARA_RPC_ENDPOINT} --state-dir {STATE_DIR}
firemantra fetch {FIRST_STREAMABLE_BLOCK} --endpoints {VARA_RPC_ENDPOINT} --state-dir {STATE_DIR}
fireinjective fetch {FIRST_STREAMABLE_BLOCK} --endpoints {VARA_RPC_ENDPOINT} --state-dir {STATE_DIR}