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For my project I need to check the balance of a public address using bitcoind. Can I do that without importing the private key, only by public address?
Need solution no dependence, because I tried with blockchain.info API and after x requests, they blocked me. I need to check a lot addresses every 30 minutes.
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Instead of polling many addresses every 30 minutes, you probably want to import your addresses into bitcoind, using bitcoin-cli importaddress and then have bitcoind notify you automatically when a new transaction comes in, using the walletnotify option.
See for example: How do I use walletnotify?
There are a lot of details to get right: transactions might never confirm, the transaction ID might change. When bitcoind loses connection to the network, you want your script to be able to handle that. etc.
for import address bitcoind ask private key, I'm need solution only whit public key. – AutoSoft – 2015-10-27T13:12:56.587
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Bitcoind supports watch-only addresses with only the address. See here for more details: https://bitcoin.stackexchange.com/questions/22152/add-a-watch-only-wallet-in-bitcoind
– JohnDvorak – 2015-10-27T14:37:01.787