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Donate

Every calculator on CalcHub is free, with no account and no paywall. Donations help cover hosting and development, and they keep the calculators free for everyone.

Donations go directly to the site owner's own wallet — there is no middleman and no payment gateway. We charge 0% platform fee; you pay only the network fee charged by the blockchain, which goes to the network, not to us. USD values are estimates based on a live rate shown on the payment page.

This site never receives or stores card details, private keys or seed phrases — you pay from your own wallet to the address shown on the next screen. For details on what we store for a payment, see the crypto payments section of our Privacy Policy.

Crypto payments are not enabled yet — wallet setup in progress.

How to pay, by asset

Bitcoin (BTC) — Bitcoin mainnet

  1. Send only on Bitcoin mainnet to the address shown.
  2. Send the exact amount shown — do not round it.
  3. You pay the network fee on top of the amount shown, so the full amount arrives.

A donation counts as received only after 3 confirmations on Bitcoin mainnet. Send only BTC on Bitcoin mainnet — sending on a different network may lose your funds and cannot be credited automatically.

Ethereum (ETH) — Ethereum mainnet

  1. Send only on Ethereum mainnet to the address shown.
  2. Send the exact amount shown — do not round it.
  3. You pay the network fee (gas) on top of the amount shown, so the full amount arrives.

A donation counts as received only after 12 confirmations on Ethereum mainnet. Send only ETH on Ethereum mainnet — sending on a different network may lose your funds and cannot be credited automatically.

USD Coin (USDC) (USDC) — Base mainnet

  1. Send only on Base mainnet — native USDC on Base only, not bridged USDbC and not USDC on another network.
  2. Send the exact amount shown — do not round it.
  3. You pay the network fee on top of the amount shown, so the full amount arrives.

A donation counts as received only after 10 confirmations on Base mainnet. Send only USDC on Base mainnet — sending on a different network may lose your funds and cannot be credited automatically.