Index	Field	Type	Description
[0]	KEY	string	Requested key(s)
[1]	MTS	int	Millisecond epoch timestamp
[ . . . ]
[3]	DERIV_PRICE	float	Derivative book mid price
[4]	SPOT_PRICE	float	Book mid price of the underlying Bitfinex spot trading pair
[ . . . ]
[6]	INSURANCE_FUND_BALANCE	float	The balance available to the liquidation engine to absorb losses
[ . . . ]
[8]	NEXT_FUNDING_EVT_MTS	int	Millisecond timestamp of next funding event
[9]	NEXT_FUNDING_ACCRUED	float	Current accrued funding for next 8h period
[10]	NEXT_FUNDING_STEP	int	Incremental accrual counter
[ . . . ]
[12]	CURRENT_FUNDING	float	Funding applied in the current 8h period
[ . . . ]
[15]	MARK_PRICE	float	Price based on the BFX Composite Index
[ . . . ]
[18]	OPEN_INTEREST	float	Total number of outstanding derivative contracts
[ . . . ]
[22]	CLAMP_MIN	float	Range in the average spread that does not require a funding payment
[23]	CLAMP_MAX	float	Funding payment cap

Rate Limit:

90 reqs/min (requests per minute)