Gas Fee Scam

Gas fees are the small amounts of cryptocurrency paid to miners or validators on proof-of-work or proof-of-stake networks to process transactions. Gas fee scams exploit public unfamiliarity with this concept in two main ways.

In the advance-fee variant, a scammer claims the victim has won cryptocurrency, received an inheritance, or is owed a refund, but must first pay a gas fee in a specific coin to 'unlock' or 'release' the funds. The promised funds never materialise, but the victim has sent real cryptocurrency. This is structurally identical to the classic advance fee fraud, simply reframed in crypto terminology.

In the technical variant, victims are tricked into approving smart contract interactions that set excessively high gas limits or include hidden fee-taking logic. Legitimate transactions on Ethereum-compatible networks do require gas, so victims may not question a gas cost request; scammers rely on this to slip in unexpected charges. Some honeypot contracts are designed to allow deposits but then consume all remaining balance as 'fees' when the user tries to withdraw.

Users should use reputable wallets that simulate transactions and display expected gas costs, never pay upfront fees to 'release' promised funds, and verify any DeFi contract through independent audit reports before interacting.