Create swap EIP 7702 calldata

Create the EIP 7702 calldata for a swap transaction (including wrap/unwrap and bridging) against the Uniswap Protocols. If the quote parameter includes the fee parameters, then the calldata will include the fee disbursement. The gas estimates will be more precise when the the response calldata would be valid if submitted on-chain.

Native ETH / UniswapX setup: When x-erc20eth-enabled is true and the input token is native ETH, the response may include an additional native approval call (e.g. an approveNative step) to enable ERC20-ETH (EIP-7914) spending for the wallet. This native allowance is a prerequisite for native ETH input on UniswapX (/quote → /order) for supported wallets.

npx skills add uniswap/uniswap-trading --skill swap-integration

Full swap flow integration for apps. Works with Claude Code, Cursor, and other AI coding tools.

Get a QuoteThis endpoint requires a quote response from the Quote API.

Authorization

x-api-keystringrequiredheader

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Headers

x-universal-router-versionenumdefault:2.0

1.22.02.1.1

The version of the Universal Router to use for the swap journey. *MUST* be consistent throughout the API calls.

x-erc20eth-enabledbooleandefault:false

Enable native ETH input support for UniswapX via ERC20-ETH (EIP-7914). When set to true and tokenIn is the native currency address (e.g. 0x0000000000000000000000000000000000000000), the API may return UniswapX routes that spend native ETH for supported wallets.

Body

application/json

smartContractDelegationAddressstring

includeGasInfobooleandefault:false

deadlinenumber

The unix timestamp at which the order will be reverted if not filled.

urgencyenumdefault:urgent

normalfasturgent

The urgency impacts the estimated gas price of the transaction. The higher the urgency, the higher the gas price, and the faster the transaction is likely to be selected from the mempool. The default value is urgent.

simulateTransactionboolean

POST/swap_7702

Request

curl --request POST \
  --url 'https://trade-api.gateway.uniswap.org/v1/swap_7702' \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --header 'x-universal-router-version: 2.0' \
  --header 'x-erc20eth-enabled: false'

Create swap EIP 7702 calldata

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Authorization

Headers

Body