Token Approvals Explained on Ethereum
Why token approvals matter, what they authorize, and how to review them responsibly.
Why this matters on Ethereum
An approval gives a contract permission to spend a specified token balance under the rules of that approval. Reviewing old approvals can reduce exposure to applications you no longer use.
Ethereum is an EVM network and the base layer for a large ecosystem of tokens, applications and Layer 2 networks.
Ethereum uses EVM-style addresses and token contracts, which means the same address can hold balances on several EVM networks at once. A balance that is missing on Ethereum may simply be sitting on a different network.
Ethereum: what to pay attention to
- Security: Pay close attention to contract approvals, transaction details and the exact domain used to initiate a transaction.
- Assets and tokens: Verify the ERC-20 contract address and distinguish Ethereum-native assets from representations on other networks.
- Costs: Ethereum gas can make very small balance movements uneconomical, so compare total execution cost with the balance value.
A Ethereum checklist for this topic
- Verify the contract address on Ethereum from an independent source rather than a ticker or a logo.
- Read what a Ethereum transaction or signature request actually authorizes before approving it.
- Treat unexpected tokens or links that appear in a Ethereum wallet as untrusted until verified.
- Review and revoke permissions you no longer use on Ethereum, especially unlimited approvals.
Bridge from Ethereum
Ethereum gas can make very small balance movements uneconomical, so compare total execution cost with the balance value. On the Polygon side: confirm that the token is held on Polygon and verify its contract before moving or swapping it.
The bridge guide below is informational; any transaction depends on current network conditions and the route shown in the bridge interface.
Ethereum → Polygon BRIDGE GUIDE