March 21 (Reuters) - The Baltic Exchange's dry bulk sea freight index, which monitors rates for vessels moving dry bulk commodities, snapped a four-session losing streak on Friday, buoyed by an uptick in rates across all vessel segments.

* The main index .BADI, which factors in rates for capesize, panamax and supramax shipping vessels, added 8 points to 1,643 points. However, the index fell 2% for the week.

* The capesize index .BACI gained 6 points to 2,676 points, ending a five-session losing streak, but was down close to 7% for the week.

* Average daily earnings for capesize vessels .BATCA, which typically transport 150,000-ton cargoes such as iron ore and coal, rose by $51 to $22,190.

* Iron ore futures drifted lower on Friday and were headed for a weekly loss due to mounting concerns over demand prospects in top consumer China amid an escalating global trade war. IRONORE/

* The panamax index .BPNI added 18 points to 1,375.

* Average daily earnings for panamax vessels .BPWT, which usually carry 60,000-70,000 tons of coal or grain, rose $162 to $12,379.

* Among smaller vessels, the supramax index .BSIS was up 2 points at 1,012 points — a more than four-month high. The index rose 9% for the week, its second consecutive weekly gain.

(Reporting by Ishaan Arora in Bengaluru; Editing by Sahal Muhammed)

((Ishaan.Arora@thomsonreuters.com;))