get https://api.chain49.com//v2/xpub/
Returns balances and transactions of an xpub or output descriptor, applicable only for Bitcoin-type coins.
Blockbook supports BIP44, BIP49, BIP84 and BIP86 (Taproot) derivation schemes, using either xpubs or output descriptors (see https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md)
Note: usedTokens always returns total number of used addresses of xpub.
Detailed documentation found here: https://github.com/trezor/blockbook/blob/master/docs/api.md#get-xpub