API keys
POSTCheck if token approval is required

Check if token approval is required

Allows the requestor to check if the walletAddress has the required approval to transact the token up to the amount specified. If the walletAddress does not have the required approval, the response will include a transaction to approve the token spend. If the walletAddress has the required approval, the response will return the approval with a null value. If the parameter includeGasInfo is set to true and an approval is needed, then the response will include both the transaction and the gas fee for the approval transaction.

Certain tokens may require that approval be reset before approving a new spend amount. If this condition is detected for the walletAddress and token, the response will include the necessary approval cancellation in the cancel paragraph. When cancel is not applicable, the paragraph will have a null value.

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.

Authorization

x-api-keystringrequiredheader
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Headers

x-permit2-disabledbooleandefault:false

Disables the Permit2 approval flow. When set to true, permitData is returned as null and the header is forwarded to the routing layer for correct gas simulation against the Proxy Universal Router contract. When false or omitted, the standard Permit2 approval flow is used. This header is intended for integrators whose infrastructure uses a direct approval-then-swap pattern without Permit2.

Body

application/json
walletAddressstringrequired

The wallet address which will be used to send the token.

tokenstringrequired

The token which will be sent, specified by its token address. For a list of supported tokens, see the FAQ.

amountstringrequired

The quantity of tokens denominated in the token's base units. (For example, for an ERC20 token one token is 1x10^18 base units. For one USDC token one token is 1x10^6 base units.) This value must be greater than 0.

chainIdenumrequireddefault:1
11056130137143196324480186842178453101434216142220431145914481457777777713018453211155111

The unique ID of the blockchain. For a list of supported chains see the FAQ.

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.

includeGasInfobooleandefault:false

If set to true, the response will include the estimated gas fee for the proposed transaction.

tokenOutstring

The token which will be received, specified by its token address. For a list of supported tokens, see the FAQ.

tokenOutChainIdenumdefault:1
11056130137143196324480186842178453101434216142220431145914481457777777713018453211155111

The unique ID of the blockchain. For a list of supported chains see the FAQ.