Uniswap Wallet API

openapi: 3.0.0
info:
  version: 1.0.0
  title: Token Trading Approval Wallet API
  description: 'Uniswap Labs trading APIs.


    Each operation may include the vendor extension `x-public-endpoint` (boolean): `true` when the operation is available on the public gateway for standard API keys, `false` when it is not publicly exposed. See the [OpenAPI specification extensions](https://swagger.io/docs/specification/v3_0/openapi-extensions/) definition of `x-` fields.'
servers:
- description: Uniswap Trading API
  url: https://trade-api.gateway.uniswap.org/v1
security:
- apiKey: []
tags:
- name: Wallet
paths:
  /wallet/encode_4337:
    post:
      tags:
      - Wallet
      summary: Encode ERC-4337 UserOperation
      description: Builds and returns a fully-populated ERC-4337 v0.8 UserOperation for the given batch of calls. When a `paymasterUrl` is provided the endpoint attempts gas sponsorship via the paymaster; the response indicates whether sponsorship was granted and includes sponsor metadata when available.
      operationId: encode_4337
      security:
      - apiKey: []
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Encode4337Request'
      responses:
        '200':
          description: UserOperation encoded successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Encode4337Response'
        '400':
          $ref: '#/components/responses/BadRequest400'
        '401':
          $ref: '#/components/responses/Unauthorized401'
        '429':
          $ref: '#/components/responses/RateLimitedErr429'
        '500':
          $ref: '#/components/responses/InternalErr500'
        '504':
          $ref: '#/components/responses/Timeout504'
      x-public-endpoint: false
components:
  schemas:
    Eip7702Authorization:
      type: object
      description: Signed EIP-7702 authorization tuple.
      properties:
        address:
          type: string
          description: Contract address to delegate to.
        chainId:
          type: string
          description: Hex-encoded chain ID.
        nonce:
          type: string
          description: Hex-encoded nonce.
        r:
          type: string
          description: ECDSA r value.
        s:
          type: string
          description: ECDSA s value.
        yParity:
          type: string
          description: ECDSA y parity.
      required:
      - address
      - chainId
      - nonce
      - r
      - s
      - yParity
    ChainId:
      description: The unique ID of the blockchain. For a list of supported chains see the [FAQ](https://api-docs.uniswap.org/guides/faqs).
      type: number
      enum:
      - 1
      - 10
      - 56
      - 130
      - 137
      - 143
      - 196
      - 324
      - 480
      - 1868
      - 4217
      - 8453
      - 10143
      - 42161
      - 42220
      - 43114
      - 59144
      - 81457
      - 7777777
      - 1301
      - 84532
      - 11155111
      default: 1
    Err500:
      type: object
      properties:
        errorCode:
          default: InternalServerError
          type: string
        detail:
          type: string
    Encode4337SponsorMetadata:
      type: object
      description: Display information about the sponsor covering gas fees.
      properties:
        name:
          type: string
          description: Display name of the sponsor.
        icon:
          type: string
          description: URL of the sponsor's logo or icon.
      required:
      - name
    UserOperation:
      type: object
      description: ERC-4337 v0.8 UserOperation.
      properties:
        sender:
          type: string
          description: Smart account address that will execute the operation.
        nonce:
          type: string
          description: Anti-replay nonce from the EntryPoint.
        callData:
          type: string
          description: ABI-encoded call data for the batch execution.
        callGasLimit:
          type: string
          description: Gas limit for the main execution call.
        verificationGasLimit:
          type: string
          description: Gas limit for the verification step.
        preVerificationGas:
          type: string
          description: Gas to cover bundler overhead and L1 data costs.
        maxFeePerGas:
          type: string
          description: EIP-1559 max fee per gas.
        maxPriorityFeePerGas:
          type: string
          description: EIP-1559 max priority fee per gas.
        factory:
          type: string
          description: Account factory address (present for first-time account deployment).
        factoryData:
          type: string
          description: Calldata for the account factory.
        paymaster:
          type: string
          description: Paymaster contract address (present when gas is sponsored).
        paymasterVerificationGasLimit:
          type: string
          description: Gas limit for paymaster verification.
        paymasterPostOpGasLimit:
          type: string
          description: Gas limit for paymaster post-operation.
        paymasterData:
          type: string
          description: Paymaster-specific data.
        signature:
          type: string
          description: Dummy signature placeholder; the client signs the UserOperation after receiving this response.
        eip7702Auth:
          $ref: '#/components/schemas/Eip7702Authorization'
      required:
      - sender
      - nonce
      - callData
      - callGasLimit
      - verificationGasLimit
      - preVerificationGas
      - maxFeePerGas
      - maxPriorityFeePerGas
      - signature
    Encode4337Response:
      type: object
      description: Response containing the encoded ERC-4337 UserOperation with gas and sponsorship details.
      properties:
        requestId:
          type: string
          description: Unique identifier for this request.
        userOperation:
          $ref: '#/components/schemas/UserOperation'
        sponsorMetadata:
          $ref: '#/components/schemas/Encode4337SponsorMetadata'
        gasSponsored:
          type: boolean
          description: Whether gas for this operation is sponsored by a paymaster.
        gasSponsorshipRejectionReason:
          type: string
          description: Reason gas sponsorship was not granted. Present only when `gasSponsored` is `false`.
      required:
      - requestId
      - userOperation
      - gasSponsored
    Address:
      type: string
      pattern: ^(0x)?[0-9a-fA-F]{40}$
    Err504:
      type: object
      properties:
        errorCode:
          default: Timeout
          type: string
        detail:
          type: string
    Encode4337Request:
      type: object
      description: Request body for encoding an ERC-4337 UserOperation.
      properties:
        calls:
          type: array
          description: Batch of transactions to encode into the UserOperation.
          items:
            $ref: '#/components/schemas/TransactionRequest5792'
          minItems: 1
        sender:
          $ref: '#/components/schemas/Address'
          description: Smart account address that will execute the operation.
        chainId:
          $ref: '#/components/schemas/ChainId'
        paymasterUrl:
          type: string
          format: uri
          description: JSON-RPC URL of a paymaster service for gas sponsorship.
        paymasterServiceContext:
          type: object
          description: 'Opaque context forwarded to the paymaster (e.g. `{ "policyId": "..." }`).'
        eip7702Auth:
          $ref: '#/components/schemas/Eip7702Authorization'
      required:
      - calls
      - sender
      - chainId
    maxFeePerGas:
      type: string
      description: The sum of the base fee and priority fee. Subtracting `maxPriorityFeePerGas` from this value will yield the base fee to be paid for this transaction.
    Err400:
      type: object
      properties:
        errorCode:
          default: RequestValidationError
          type: string
        detail:
          type: string
    gasLimit:
      type: string
      description: The maximum units of gas that will be consumed by this transaction.
    receiverWalletAddress:
      type: string
      description: The wallet address which will receive the token.
      pattern: ^(0x)?[0-9a-fA-F]{40}$
    Err401:
      type: object
      properties:
        errorCode:
          default: UnauthorizedError
          type: string
        detail:
          type: string
    gasPrice:
      type: string
      description: The cost per unit of gas.
    TransactionRequest5792:
      type: object
      properties:
        to:
          $ref: '#/components/schemas/receiverWalletAddress'
        data:
          type: string
          description: The calldata for the transaction.
        value:
          type: string
          description: The quantity of ETH tokens approved for spending by the transaction, denominated in wei. Note that by default Uniswap Labs sets this to the maximum approvable spend.
        gasLimit:
          $ref: '#/components/schemas/gasLimit'
        maxFeePerGas:
          $ref: '#/components/schemas/maxFeePerGas'
        maxPriorityFeePerGas:
          $ref: '#/components/schemas/maxPriorityFeePerGas'
        gasPrice:
          $ref: '#/components/schemas/gasPrice'
      required:
      - to
      - data
      - value
      - chainId
    Err429:
      type: object
      properties:
        errorCode:
          default: Ratelimited
          type: string
        detail:
          type: string
    maxPriorityFeePerGas:
      type: string
      description: The maximum tip to the block builder. Adjusted based upon the urgency specified in the request.
  responses:
    RateLimitedErr429:
      description: Ratelimited
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Err429'
    Unauthorized401:
      description: UnauthorizedError eg. Account is blocked.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Err401'
    BadRequest400:
      description: RequestValidationError, Bad Input
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Err400'
    Timeout504:
      description: Request duration limit reached.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Err504'
    InternalErr500:
      description: Unexpected error
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Err500'
  securitySchemes:
    apiKey:
      type: apiKey
      in: header
      name: x-api-key