The default bitcoind wallet can handle thousands (and more) addresses and monitor them. Using the JSON-RPC, built-ins like walletnotify you should be able to build your own solution with the stack of your choice. 3rd parties is not the right approach, you'll quickly reach limits that require you to pay, so at that point you might as well spin up VPS and run ...
According to the Blockchain record for address
Money received from bc1qq9...6cfvgq
Failed low-fee transaction, now invalid
Money sent to 1EqnaM...WQGW6y
how can I get ...