Best lifetime isa interest rate

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Can anyone recommend the best interest rate for lifetime isa please?

MSE is usually a reliable source for this sort of thing. https://www.moneysavingexpert.com/savings/lifetime-isas/

You don't say what you want the Lifetime ISA for, but remember that if it's for retirement you can have a Lifetime Stocks & Shares ISA, which is worth considering compared to investing for decades in just cash.