Tool
Check the balance of any Bitcoin address in seconds. Legacy, SegWit and bech32 formats all work. The data comes live from mempool.space and the USD value from CoinGecko, the same sources that power the puzzle balances on this site.
The balance is fetched live from mempool.space, the same source this site uses for the puzzle balances.
Every Bitcoin balance is public by design. An address's balance is simply the sum of coins it has received minus the coins it has spent, and any full node can compute it. This checker asks mempool.space, a widely used open source block explorer, and includes unconfirmed transactions sitting in the mempool, so what you see reflects pending activity too.
Received, sent, and the quantum detail. The total received and total sent figures tell a story the balance alone does not. An address that has never sent keeps its public key hidden behind hashes. The moment it spends, the public key appears on the blockchain forever, which is harmless today but becomes relevant in a world of capable quantum computers. The quantum canary page explains why.
This tool grew out of the Bitcoin Puzzle, where watching balances is half the fun: the unsolved puzzles hold prizes you can verify here address by address, and the prize page totals them all live. If you have a private key and want its address first, use the private key to address tool.