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We report a stability below $7\times 10{}^{-17}$ of two independent opticallattice clocks operating with bosonic ${}^{88}$Sr isotope. The value(429228066418008.3(1.9)${}_{syst}$(0.9)${}_{stat}$~Hz) of the absolutefrequency of the ${}^{1}S_{0}$ - ${}^{3}P_{0}$ transition was measured with anoptical frequency comb referenced to the local representation of the UTC by the330 km-long stabilized fibre optical link. The result was verified by series ofmeasurements on two independent optical lattice clocks and agrees withrecommendation of Bureau International des Poids et Mesures.

Absolute measurement of the ${}^{1}S_{0}$ - ${}^{3}P_{0}$ clock transition in neutral ${}^{88}$Sr over the 330 km-long stabilized fibre optic link