This is a Type B "foundational explainer" that answers the question of whether 7702 gas sponsorship is safe. It breaks down the sponsorship mechanism and its limitations.
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EIP-7702 gas sponsorship itself is safe—the technology is already running stably with complete implementations. But whether transaction content can be restricted does not depend on the protocol; it depends on how the contract you delegate to is written.
First, understand how 7702 gas sponsorship works
EIP-7702 allows a regular EOA wallet to gain batch transaction and gas sponsorship capabilities through a one-time authorization (delegating execution rights to a contract).
The gas sponsorship flow works like this:
- You (the EOA account) sign a message with your private key, specifying the operation to execute (such as a Swap)
- Another account (a Relayer or sponsor wallet) submits the transaction for you and pays the gas fees
- The signature includes an authorization_list, and during the transaction the EVM points your account code to the delegated contract
You can initiate on-chain transactions without holding ETH yourself. Infrastructure like Biconomy, Dfns, and Privy already supports 7702 gas sponsorship, so the mechanism is technically mature.
The key question: who can restrict transaction content?
Answer: the delegated contract you authorized in advance, not the person paying for gas.
The EIP-7702 authorization tuple contains three core fields: chain_id (which chain it applies to), address (which contract to delegate to), and nonce (replay protection).
The party paying for gas (the Relayer) can only do two things: submit the transaction you already signed and pay the gas. The Relayer cannot modify the transaction content in your signature—any tampering would invalidate the signature.
The real restriction capability lies in the delegated contract. The delegated contract can include logic such as:
- Spending limits: how much can be transferred per transaction or per day
- Operation whitelist: only allow specific types of operations (for example, only Swaps, not transfers)
- Session keys: grant time-limited, scope-limited permissions to specific DApps
If you delegate to a contract with no restrictions, then it can indeed execute any operation within the scope you authorized. The key to security is not "who pays for gas" but "who you authorized."
Where the risk lies: who you authorize matters more than who pays
Research indicates that 63% of EIP-7702 authorization transactions are linked to attacker-controlled contracts, with confirmed losses exceeding $2.36 million.
The attack pattern usually works like this:
- A phishing site tricks users into signing requests like "claim airdrop" or "wallet upgrade"
- The signature request is actually a malicious EIP-7702 authorization that delegates the wallet to an attacker-controlled contract
- Once signed, the attacker gains persistent execution rights and can sweep assets in batches
Gas sponsorship itself just makes things more convenient for scammers. In 2025, a user lost $1.54 million by signing a 7702 phishing transaction. If you authorize a malicious contract, even without gas, the attacker can easily move your assets through the sponsorship mechanism.
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How to use 7702 gas sponsorship safely
- Verify the delegated contract address before authorizing: make sure it is an official contract you trust. EIP-7702 delegation is persistent and does not expire after a single transaction; it needs to be manually cleared.
- Pay attention to clear wallet warnings: if the wallet's signature request only shows a hash value without parsing the specific operation details, reject it.
- Check whether 7702 gas sponsorship is supported: some protocols do not support Type 4 transactions. For example, THORChain explicitly does not support EIP-7702, and using it may result in fund loss.
How to verify after completing operations: Use Etherscan or another block explorer, enter your wallet address, and check the "Authorizations (EIP-7702)" section. If it is empty or shows an official contract address you trust, the delegation status is under control. If it shows an unfamiliar address, immediately send a 0x04 transaction to point the delegation to the zero address and clear it.
Next step: If you are not sure whether you have authorized a 7702 delegation, go to Etherscan now and check the "Authorizations" section. If it shows an unfamiliar contract address, do not wait—use an official wallet tool to clear it. This habit is far more useful than asking others after something goes wrong.
