Litecoin has recently updated the prefixes of their P2SH addresses that begin with "3" to addresses that begin with "M". This change was made to stop confusion between BTC and LTC's P2SH addresses, which used to be able to have the same "3" prefix. This does not affect all LTC addresses, as the "L" prefix LTC legacy addresses (non-SegWit) will stay the same.
Crypto APIs now support LTC addresses which begin with "L", "3" and "M" (Creating, Checking, Sending etc.)
Most of Litecoin block explorers still don't support it, however Block Explorer One (https://blockexplorer.one) fully supports it.
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