How to Send Gasless Transactions? Complete Guide

Gasless transactions let users interact with dApps without holding native gas tokens by having a relayer or sponsor pay fees on their behalf; they’re implemented via meta‑transactions, trusted forwarders, or account abstraction.

Overview of Gasless Transaction

Gasless transactions (also called meta‑transactions) let a user sign an off‑chain intent which a relayer submits on‑chain while paying gas; the smart contract verifies the original signer and executes the action. This removes the onboarding friction of requiring users to buy native tokens before using a dApp.

Key components

• User: signs a structured message describing the desired contract call.
• Relayer / Sponsor: wraps the signed intent into a transaction, pays gas, and broadcasts it.
• Smart Contract Forwarder: verifies the signature and executes the requested function, ensuring the relayer cannot alter intent.

Standards and technologies

• EIP‑712 typed structured data signing is the cryptographic foundation for readable, secure off‑chain signatures.
• EIP‑2771 Trusted Forwarder standardizes how contracts accept meta‑transactions and recover the original signer.
• ERC‑4337 Account Abstraction enables smart‑contract wallets with programmable gas sponsorship and more decentralized bundler/relayer models.

Benefits

• Improved UX: users can interact immediately without buying gas tokens.
• Lower onboarding friction for mainstream users and mobile-first experiences.

Risks and tradeoffs

• Relayer trust and economics: relayers must be compensated (directly by dApp, via sponsorship, or via off‑chain settlement), and their incentives must be managed.
• Security: replay attacks, signature malleability, and improper forwarder verification are common pitfalls; implement nonce schemes and strict signature checks.

How to Send Gasless Transactions

Step 1 Prepare the intent

1. Build the typed data payload (EIP‑712) describing the contract call and a nonce.
2. Ask the user to sign the typed data with their wallet (wallet shows readable fields).

Step 2 Relay the signed intent

1. Send the signed payload to a relayer endpoint (your backend or a relayer service).
2. The relayer wraps the payload into a transaction calling the contract’s trusted forwarder or the contract directly (depending on implementation) and pays gas.

Step 3 On‑chain verification and execution

1. The forwarder contract verifies the signature, nonce, and expiry, then calls the target contract as the original user.
2. The target contract executes the requested function and emits events for tracking.

Practical tips

• Use audited forwarder libraries and follow EIP‑2771 or ERC‑4337 reference implementations.
• Implement replay protection with nonces and expirations.
• Monitor relayer economics and consider gas sponsorship caps to limit exposure.

Gasless transactions use EIP‑712 typed data so a user signs an off‑chain intent and a relayer submits it on‑chain; below are ready‑to‑use EIP‑712 payload examples (domain, types, message) and a short client snippet showing how to sign them.

EIP‑712 Payloads Essentials (quick)

Domain binds the signature to a dApp, chain, and contract; Types define the structured data schema; Message is the actual payload the user signs. Use nonces and expirations for replay protection.

Reas Also-

{
  "domain": {
    "name": "MyDApp",
    "version": "1",
    "chainId": 137,
    "verifyingContract": "0xAaBbCc...1234"
  },
  "types": {
    "EIP712Domain": [
      {"name":"name","type":"string"},
      {"name":"version","type":"string"},
      {"name":"chainId","type":"uint256"},
      {"name":"verifyingContract","type":"address"}
    ],
    "Action": [
      {"name":"user","type":"address"},
      {"name":"action","type":"string"},
      {"name":"value","type":"uint256"},
      {"name":"nonce","type":"uint256"},
      {"name":"deadline","type":"uint256"}
    ]
  },
  "primaryType": "Action",
  "message": {
    "user": "0xUserAddress...",
    "action": "transferCredits",
    "value": 100,
    "nonce": 42,
    "deadline": 1710000000
  }
}

{
  "domain": {
    "name": "MyDApp",
    "version": "1",
    "chainId": 137,
    "verifyingContract": "0xAaBbCc...1234"
  },
  "types": {
    "EIP712Domain": [
      {"name":"name","type":"string"},
      {"name":"version","type":"string"},
      {"name":"chainId","type":"uint256"},
      {"name":"verifyingContract","type":"address"}
    ],
    "Action": [
      {"name":"user","type":"address"},
      {"name":"action","type":"string"},
      {"name":"value","type":"uint256"},
      {"name":"nonce","type":"uint256"},
      {"name":"deadline","type":"uint256"}
    ]
  },
  "primaryType": "Action",
  "message": {
    "user": "0xUserAddress...",
    "action": "transferCredits",
    "value": 100,
    "nonce": 42,
    "deadline": 1710000000
  }
}