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Blockra is non-custodial: you connect your own wallet, and every payment settles straight into it. Blockra never holds your crypto and can never move it. You set this up by adding your wallet’s extended public key — an xpub — under Settings → Payment Methods. An extended public key lets Blockra generate a fresh receiving address for each payment, all belonging to your wallet, with no ability to spend. Think of it as a read-only key: it can create and watch addresses, nothing more.
Only ever paste an extended public key — one that starts with xpub, ypub, zpub (Bitcoin) or Ltub (Litecoin). Never paste a private key, a seed phrase, or anything starting with xprv / yprv / zprv. Blockra rejects private keys, but you should never hand a seed phrase to any service — that gives away your funds.

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What you need

One extended public key per network you want to accept: USDC and USDT are ERC-20 tokens, so your Ethereum key covers all three.

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Add it in the dashboard

1

Open Payment Methods

Go to Settings → Payment Methods in your Blockra dashboard.
2

Connect a network

Click Connect next to Bitcoin, Litecoin, or Ethereum.
3

Paste your xpub

Paste your wallet’s extended public key and save. That coin goes live, and every payment derives a fresh address that pays into your wallet.

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Finding your xpub

This is the part most guides skip. Where the key lives depends on your wallet — look for the wording “extended public key”, “master public key”, or “xpub”.
Open your wallet, then Wallet → Information. Copy the Master Public Key — that’s your zpub/xpub. For Litecoin, use Electrum-LTC: same menu, gives an Ltub.

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Getting an Ethereum xpub

Wallets like MetaMask don’t expose an extended public key, which makes Ethereum the trickiest one. You need the account-level extended public key on the standard Ethereum path m/44'/60'/0'. The reliable route is a hardware wallet — Trezor Suite can show the Ethereum account’s public key, or read a Ledger through a compatible wallet. If your wallet can’t export one, create a dedicated receiving wallet in a tool that can, back the seed up offline, and use its xpub.
Don’t have a wallet yet? Create one in Electrum or Sparrow, write the seed phrase down and store it offline, then copy the master public key into Blockra. The seed stays with you; only the public key goes to Blockra.

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Good to know

  • A fresh address per payment. Blockra derives a new address for each checkout, so you never reuse one — better privacy, and every payment is easy to reconcile.
  • Change it anytime. Reconnect a network with a new key and future payments use it; payments already in flight settle to the address they were issued.
  • Address types. xpub, ypub, and zpub all work — Blockra generates the matching address format automatically.