Terms of use
Back to MidswapLast updated 12 November 2026
What this is
Midswap is a non-custodial interface that prepares token swaps routed through Uniswap v3 on Ethereum and Base. You sign with your own wallet; Midswap never holds your keys.
Routes and gas
- Gasless: when your wallet supports EIP-2612 or has a live Permit2 allowance, a relayer submits the transaction and you pay no gas. Relaying depends on the relayer having gas.
- Self-paid: otherwise your wallet sends one transaction to the router (with an approval if needed), or transfers the token directly when no pool route exists.
Fees
Midswap takes no platform fee. The Uniswap pool fee tier (0.01%, 0.05%, 0.3% or 1%) is paid to liquidity providers inside the swap. Network gas is separate.
Execution and slippage
Quotes are estimates from on-chain state. The minimum received is enforced at 98% of the quote for relayed swaps. A swap that cannot execute falls back to delivering the token itself, so funds are not stranded on the router. Price impact, MEV and failed transactions are part of using public blockchains.
What you authorize
A Permit2 signature authorizes the relayer to move the exact amount once, until the deadline. A router approval authorizes the router contract to move that token; the approval can be revoked in your wallet at any time.
No warranty
The interface and contracts are provided as-is. Contract addresses and their verification status are shown in the app. Always confirm the network and the amounts in your wallet before signing.