Blockchain & Cryptocurrency Glossary

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Gasless Transactions (Wallet Context)

1 min read
Pronunciation
[gas-lis tranz-ak-shuns]
Analogy
Gasless transactions are like a restaurant where someone else pays the tip on your behalf.
Definition
Transactions where the end user does not pay gas directly; instead a relayer or paymaster covers fees, improving UX.
Key Points Intro
Gasless UX is enabled by:
Key Points

Meta‑transactions: User signs intent, relayer submits tx.

Paymaster: Contract reimburses relayer in tokens.

Approval logic: Wallet verifies paymaster’s terms.

EntryPoint: Bundles user ops in ERC‑4337 flows.

Example
A DApp lets users trade ERC‑20 tokens without ETH; a sponsored relayer pays gas and charges a small token fee.
Technical Deep Dive
User signs `UserOperation` with target, data, maxFee. Relayer calls EntryPoint’s `handleOps`, paying gas. Paymaster contract implements `validatePaymasterUserOp` and `postOp` to settle gas in tokens via DEX swap.
Security Warning
Malicious paymasters can exploit users by overcharging; wallet should verify paymaster’s policy.
Caveat
Relayer availability and trust assumptions add complexity.
Related Terms
Account Abstraction
Paymaster

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