Free tools: calculators and checkers that run in your browser
Nothing is uploaded. No account needed.
Stablecoin fee calculator
The calculator shows how many USDC you receive for an amount in EUR or USD, or how much money reaches your bank when you sell. It deducts the xChange.bg fee first, 1.5% to buy (minimum EUR 1) and 1.25% to sell (minimum EUR 2), then converts the rest at the live market rate. Add your bank's fees to compare.
IBAN checker
Paste an IBAN and the checker tells you whether it is well formed. It removes spaces, checks the country code and the length for that country, then runs the ISO 13616 mod-97 test on the check digits. For a Bulgarian IBAN, which has 22 characters, it reads the four-letter bank code and names the bank. It does not confirm who owns the account.
Crypto tax calculator for Bulgaria
This calculator estimates the Bulgarian income tax an individual owes on crypto-assets for one year. Enter your total gains and total losses in euro. The net result is reduced by 10% statutory expenses and taxed at 10%, so the tax is 10% of 90% of the net gain, 9% in effect. A net loss means no tax is due.
Crypto wallet address checker
Paste a wallet address and the checker shows which format it matches and whether its checksum is correct: EIP-55 for Ethereum and EVM networks, Base58Check for Tron and older Bitcoin addresses, Bech32 or Bech32m for bc1 addresses, and a 32-byte key for Solana. It runs in your browser. A valid address can still be on the wrong network.