0x Gasless API

openapi: 3.0.3
info:
  title: 0x API
  description: This is the official API reference for the latest 0x API (v2).
  version: v2
  x-source-url: https://github.com/0xProject/0x-docs/blob/main/fern/openapi.json
  x-last-validated: '2026-05-28'
servers:
- url: https://api.0x.org
paths:
  /swap/allowance-holder/price:
    get:
      operationId: swap::allowanceHolder::getPrice
      summary: Get Price (Allowance Holder)
      description: Get the indicative price for a swap using Allowance Holder to set allowances
      tags:
      - Swap
      parameters:
      - description: Visit dashboard.0x.org to get your API Key
        in: header
        name: 0x-api-key
        required: true
        schema:
          type: string
      - description: API version
        in: header
        name: 0x-version
        required: true
        schema:
          type: string
          example: v2
      - name: chainId
        in: query
        required: true
        schema:
          type: integer
          exclusiveMinimum: true
          minimum: 0
        description: Chain ID. See [here](https://docs.0x.org/docs/introduction/supported-chains) for the list of supported
          chains
        example: 1
      - name: buyToken
        in: query
        required: true
        schema:
          type: string
          pattern: ^0x(?!0{40})[a-fA-F0-9]{40}$
        description: The contract address of the token to buy
        example: '0xdac17f958d2ee523a2206206994597c13d831ec7'
      - name: sellToken
        in: query
        required: true
        schema:
          type: string
          pattern: ^0x(?!0{40})[a-fA-F0-9]{40}$
        description: The contract address of the token to sell
        example: '0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48'
      - name: sellAmount
        in: query
        required: false
        schema:
          type: string
        description: The amount of `sellToken` in `sellToken` base units to sell
        example: '100000000'
      - name: buyAmount
        in: query
        required: false
        schema:
          type: string
        description: The exact amount of `buyToken` in `buyToken` base units to buy
      - name: taker
        in: query
        required: false
        schema:
          type: string
          pattern: ^0x[a-fA-F0-9]{40}$
        description: The address which holds the `sellToken` balance and has the allowance set for the swap
        example: '0x70a9f34f9b34c64957b9c401a97bfed35b95049e'
      - name: txOrigin
        in: query
        required: false
        schema:
          type: string
          pattern: ^0x[a-fA-F0-9]{40}$
        description: The address of the external account that started the transaction. This is only needed if `taker` is a
          smart contract.
      - name: recipient
        in: query
        required: false
        schema:
          type: string
          pattern: ^0x[a-fA-F0-9]{40}$
        description: The address to receive the `buyToken`. If not provided, defaults to the taker address. Not supported
          for wrap/unwrap operations.
      - name: swapFeeRecipient
        in: query
        required: false
        schema:
          type: string
          pattern: ^\s*0x[a-fA-F0-9]{40}(\s*,\s*0x[a-fA-F0-9]{40})*\s*$
        description: The wallet address to receive the specified trading fees (supports single or multiple comma-separated
          values). You must also specify the `swapFeeBps` in the request to use this feature. When multiple values are provided,
          must match length of `swapFeeBps`.
      - name: swapFeeBps
        in: query
        required: false
        schema:
          type: string
          pattern: ^\s*\d+(\s*,\s*\d+)*\s*$
        description: The amount in Bps of the `swapFeeToken` to charge and deliver to the `swapFeeRecipient` (supports single
          or multiple comma-separated values). You must also specify the `swapFeeRecipient` in the request to use this feature.
          For security, this field has a default limit of 1000 Bps. If your application requires a higher value, please reach
          out to us.
      - name: swapFeeToken
        in: query
        required: false
        schema:
          type: string
          pattern: ^\s*0x(?!0{40})[a-fA-F0-9]{40}(\s*,\s*0x(?!0{40})[a-fA-F0-9]{40})*\s*$
        description: The contract address of the token to receive trading fees in (supports single or multiple comma-separated
          values). Each token must be set to the value of either the `buyToken` or the `sellToken`. If omitted, the fee token
          will be determined by 0x with preference to stablecoins and highly liquid assets. You must also specify the `swapFeeRecipient`
          and `swapFeeBps` to charge integrator fees. When multiple values are provided, must match length of `swapFeeBps`.
      - name: tradeSurplusRecipient
        in: query
        required: false
        schema:
          type: string
          pattern: ^0x[a-fA-F0-9]{40}$
        description: The address to receive any trade surplus. If specified, this address will receive trade surplus when
          applicable. Otherwise, the taker will receive the surplus. This feature is only available to selected integrators
          on a custom pricing plan. In other cases, the surplus will be collected by 0x. For assistance with a custom plan,
          please contact support.
      - name: tradeSurplusMaxBps
        in: query
        required: false
        schema:
          type: integer
          minimum: 1
          maximum: 10000
        description: The maximum trade surplus (positive slippage) that can be collected in Bps of the buy amount. If not
          provided, defaults to 10000 (100%). Must be used together with `tradeSurplusRecipient`.
      - name: gasPrice
        in: query
        required: false
        schema:
          type: string
        description: The target gas price (in wei) for the swap transaction. If not provided, the default value is based on
          the 0x gas price oracle
      - name: slippageBps
        in: query
        required: false
        schema:
          type: integer
          minimum: 0
          maximum: 10000
        description: The maximum acceptable slippage of the `buyToken` in Bps. If this parameter is set to 0, no slippage
          will be tolerated. If not provided, the default slippage tolerance is 100Bps
      - name: slippagePpm
        in: query
        required: false
        schema:
          type: integer
          minimum: 0
          maximum: 1000000
        description: The maximum acceptable slippage of the `buyToken` in parts-per-million (PPM). Mutually exclusive with
          `slippageBps`. e.g. 3000 PPM = 30 BPS = 0.30%.
      - name: excludedSources
        in: query
        required: false
        schema:
          type: string
        description: Liquidity sources e.g. Uniswap_V3, SushiSwap, 0x_RFQ to exclude from the provided quote. See https://api.0x.org/sources?chainId=<chain_id>
          with the desired chain's ID for a full list of sources. Separate multiple sources with a comma
      - name: sellEntireBalance
        in: query
        required: false
        schema:
          type: string
          enum:
          - 'true'
          - 'false'
          default: 'false'
        description: If set to `true`, the taker's entire `sellToken` balance will be sold during trade execution. The `sellAmount`
          should be the maximum estimated value, as close as possible to the actual taker's balance to ensure the best routing.
          Selling more than the `sellAmount` may cause the trade to revert. This feature is designed for cases where the precise
          sell amount is determined during execution. Learn more [here](https://docs.0x.org/docs/0x-swap-api/additional-topics/sell-entire-balance).
      - name: wrapUnwrapMode
        in: query
        required: false
        schema:
          anyOf:
          - not: {}
          - type: string
            enum:
            - direct
            - settler
        description: Controls how native wrap/unwrap trades are executed. `direct` calls the wrapped-native token contract
          directly. `settler` routes wrap/unwrap through Settler or Allowance Holder for compatibility. Ignored for non-wrap/unwrap
          swaps. If omitted, `direct` mode is used.
      responses:
        '200':
          description: Successful response
          content:
            application/json:
              schema:
                anyOf:
                - anyOf:
                  - type: object
                    properties:
                      allowanceTarget:
                        type: string
                        pattern: ^0x[a-fA-F0-9]{40}$
                        nullable: true
                        description: The target contract address for which the `taker` needs to have an allowance in order
                          to be able to complete the swap. For swaps with the native asset (ie "ETH" or "BNB") as the `sellToken`,
                          wrapping the native asset (i.e. "ETH" to "WETH") or unwrapping, no allowance is needed
                      blockNumber:
                        allOf:
                        - {}
                        - type: string
                          pattern: ^[-+]?(0|[1-9]\d*)(\.\d+)?$
                        description: The block number at which the liquidity sources were sampled to generate the quote. This
                          indicates the freshness of the quote
                      buyAmount:
                        allOf:
                        - {}
                        - type: string
                          pattern: ^[-+]?(0|[1-9]\d*)(\.\d+)?$
                        description: The amount of `buyToken` (in `buyToken` units) that will be bought in the swap
                      buyToken:
                        type: string
                        pattern: ^0x[a-fA-F0-9]{40}$
                        description: The contract address of the token to buy in the swap
                      fees:
                        type: object
                        properties:
                          integratorFee:
                            type: object
                            properties:
                              amount:
                                allOf:
                                - {}
                                - type: string
                                  pattern: ^[-+]?(0|[1-9]\d*)(\.\d+)?$
                                description: The amount of token charged as the integrator fee
                              token:
                                type: string
                                pattern: ^0x[a-fA-F0-9]{40}$
                                description: The address of the token charged as the integrator fee
                              type:
                                type: string
                                enum:
                                - volume
                            required:
                            - amount
                            - token
                            - type
                            additionalProperties: false
                            nullable: true
                            description: The specified fee to charge and deliver to the `swapFeeRecipient`.
                          integratorFees:
                            type: array
                            items:
                              type: object
                              properties:
                                amount:
                                  allOf:
                                  - {}
                                  - type: string
                                    pattern: ^[-+]?(0|[1-9]\d*)(\.\d+)?$
                                  description: The amount of token charged as the integrator fee
                                token:
                                  type: string
                                  pattern: ^0x[a-fA-F0-9]{40}$
                                  description: The address of the token charged as the integrator fee
                                type:
                                  type: string
                                  enum:
                                  - volume
                              required:
                              - amount
                              - token
                              - type
                              additionalProperties: false
                            nullable: true
                            description: The specified fees to charge and deliver to the `swapFeesRecipient`.
                          zeroExFee:
                            type: object
                            properties:
                              amount:
                                allOf:
                                - {}
                                - type: string
                                  pattern: ^[-+]?(0|[1-9]\d*)(\.\d+)?$
                                description: The amount of token charged as the 0x fee
                              token:
                                type: string
                                pattern: ^0x[a-fA-F0-9]{40}$
                                description: The address of the token charged as the 0x fee
                              type:
                                type: string
                                enum:
                                - volume
                            required:
                            - amount
                            - token
                            - type
                            additionalProperties: false
                            nullable: true
                            description: The fee charged by 0x for the trade.
                          gasFee:
                            type: object
                            properties:
                              amount:
                                allOf:
                                - {}
                                - type: string
                                  pattern: ^[-+]?(0|[1-9]\d*)(\.\d+)?$
                                description: The amount of token charged as the gas fee
                              token:
                                type: string
                                pattern: ^0x[a-fA-F0-9]{40}$
                                description: The address of the token charged as the gas fee
                              type:
                                type: string
                                enum:
                                - gas
                            required:
                            - amount
                            - token
                            - type
                            additionalProperties: false
                            nullable: true
                            description: The gas fee to be used in submitting the transaction.
                        required:
                        - integratorFee
                        - integratorFees
                        - zeroExFee
                        - gasFee
                        additionalProperties: false
                        description: Fees to be deducted in this transaction. It contains the `integratorFee`, `zeroExFee`
                          and `gasFee`
                      issues:
                        type: object
                        properties:
                          allowance:
                            type: object
                            properties:
                              actual:
                                allOf:
                                - {}
                                - type: string
                                  pattern: ^[-+]?(0|[1-9]\d*)(\.\d+)?$
                                description: The `taker`'s current allowance of the `spender`
                              spender:
                                type: string
                                pattern: ^0x[a-fA-F0-9]{40}$
                                description: The address to set the allowance on
                            required:
                            - actual
                            - spender
                            additionalProperties: false
                            description: Details of allowances that the `taker` must set for in order to execute the swap
                              successfully. Null if no allowance is required
                            nullable: true
                          balance:
                            type: object
                            properties:
                              token:
                                type: string
                                pattern: ^0x[a-fA-F0-9]{40}$
                                description: The contract address of the `sellToken`
                              actual:
                                allOf:
                                - {}
                                - type: string
                                  pattern: ^[-+]?(0|[1-9]\d*)(\.\d+)?$
                                description: The current balance of the `sellToken` in the `taker` address
                              expected:
                                allOf:
                                - {}
                                - type: string
                                  pattern: ^[-+]?(0|[1-9]\d*)(\.\d+)?$
                                description: The balance of the `sellToken` required for the swap to execute successfully
                            required:
                            - token
                            - actual
                            - expected
                            additionalProperties: false
                            description: Details of balance of the `sellToken` that the `taker` must hold. Null if the `taker`
                              has sufficient balance
                            nullable: true
                          simulationIncomplete:
                            type: boolean
                            description: This is set to `true` when 0x cannot validate the transaction. This happens when
                              the `taker` has an insufficient balance of the `sellToken` and 0x is unable to peform ehanced
                              quote validation with the low balance. Note that this does not necessarily mean that the trade
                              will revert
                          invalidSourcesPassed:
                            type: array
                            items:
                              type: string
                            description: A list of invalid sources present in `excludedSources` request. See `https://api.0x.org/sources?chainId=`
                              with the desired chain's ID for the list of valid sources
                        required:
                        - allowance
                        - balance
                        - simulationIncomplete
                        - invalidSourcesPassed
                        additionalProperties: false
                        description: An object containing potential issues discovered during 0x validation that can prevent
                          the swap from being executed successfully by the `taker`
                      liquidityAvailable:
                        type: boolean
                        enum:
                        - true
                        description: This validates the availability of liquidity for the quote requested. The rest of the
                          fields will only be returned if `true`
                      minBuyAmount:
                        allOf:
                        - {}
                        - type: string
                          pattern: ^[-+]?(0|[1-9]\d*)(\.\d+)?$
                        description: The price which must be met or else the entire transaction will revert. This price is
                          influenced by the `slippageBps` parameter. On-chain sources may encounter price movements from quote
                          to settlement
                      mode:
                        type: string
                        enum:
                        - exact-in
                      route:
                        type: object
                        properties:
                          fills:
                            type: array
                            items:
                              type: object
                              properties:
                                from:
                                  type: string
                                  pattern: ^0x[a-fA-F0-9]{40}$
                                  description: The contract address of the input token
                                to:
                                  type: string
                                  pattern: ^0x[a-fA-F0-9]{40}$
                                  description: The contract address of the output token
                                source:
                                  type: string
                                  description: The liquidity source used in the route
                                proportionBps:
                                  allOf:
                                  - {}
                                  - type: string
                                    pattern: ^[-+]?(0|[1-9]\d*)(\.\d+)?$
                                  description: The proportion of the trade to be filled by the `source`
                              required:
                              - from
                              - to
                              - source
                              - proportionBps
                              additionalProperties: false
                            description: Details of each segment that 0x routes the swap through
                          tokens:
                            type: array
                            items:
                              type: object
                              properties:
                                address:
                                  type: string
                                  pattern: ^0x[a-fA-F0-9]{40}$
                                  description: The token address. This is the unique identifier of the token
                                symbol:
                                  type: string
                                  description: The token symbol. This is not guaranteed to be unique, as multiple tokens can
                                    have the same symbol
                              required:
                              - address
                              - symbol
                              additionalProperties: false
                              description: Properties of the tokens involved in the swap
                            description: Properties of the tokens involved in the swap
                        required:
                        - fills
                        - tokens
                        additionalProperties: false
                        description: The path of liquidity sources to be used in executing this swap
                      sellAmount:
                        allOf:
                        - {}
                        - type: string
                          pattern: ^[-+]?(0|[1-9]\d*)(\.\d+)?$
                        description: The amount of `sellToken` (in `sellToken` units) that will be sold in this swap
                      sellToken:
                        type: string
                        pattern: ^0x[a-fA-F0-9]{40}$
                        description: The contract address of the token to sell in the swap
                      tokenMetadata:
                        type: object
                        properties:
                          buyToken:
                            type: object
                            properties:
                              buyTaxBps:
                                allOf:
                                - {}
                                - type: string
                                  pattern: ^[-+]?(0|[1-9]\d*)(\.\d+)?$
                                nullable: true
                                description: The buy tax in bps of the token. Since each token could have arbitrary implementation,
                                  this field is best effort, meaning it would be set to `null` if the system is not able to
                                  determine the tax
                              sellTaxBps:
                                allOf:
                                - {}
                                - type: string
                                  pattern: ^[-+]?(0|[1-9]\d*)(\.\d+)?$
                                nullable: true
                                description: The sell tax in bps of the token. Since each token could have arbitrary implementation,
                                  this field is best effort, meaning it would be set to `null` if the system is not able to
                                  determine the tax
                              transferTaxBps:
                                allOf:
                                - {}
                                - type: string
                                  pattern: ^[-+]?(0|[1-9]\d*)(\.\d+)?$
                                nullable: true
                                description: The transfer tax in bps of the token. Since each token could have arbitrary implementation,
                                  this field is best effort, meaning it would be set to `null` if the system is not able to
                                  determine the tax
                            required:
                            - buyTaxBps
                            - sellTaxBps
                            - transferTaxBps
                            additionalProperties: false
                            description: Swap-related metadata for the buy token
                          sellToken:
                            type: object
                            properties:
                              buyTaxBps:
                                allOf:
                                - {}
                                - type: string
                                  pattern: ^[-+]?(0|[1-9]\d*)(\.\d+)?$
                                nullable: true
                                description: The buy tax in bps of the token. Since each token could have arbitrary implementation,
                                  this field is best effort, meaning it would be set to `null` if the system is not able to
                                  determine the tax
                              sellTaxBps:
                                allOf:
                                - {}
                                - type: string
                                  pattern: ^[-+]?(0|[1-9]\d*)(\.\d+)?$
                                nullable: true
                                description: The sell tax in bps of the token. Since each token could have arbitrary implementation,
                                  this field is best effort, meaning it would be set to `null` if the system is not able to
                                  determine the tax
                              transferTaxBps:
                                allOf:
                                - {}
                                - type: string
                                  pattern: ^[-+]?(0|[1-9]\d*)(\.\d+)?$
                                nullable: true
                                description: The transfer tax in bps of the token. Since each token could have arbitrary implementation,
                                  this field is best effort, meaning it would be set to `null` if the system is not able to
                                  determine the tax
                            required:
                            - buyTaxBps
                            - sellTaxBps
                            - transferTaxBps
                            additionalProperties: false
                            description: Swap-related metadata for the sell token
                        required:
                        - buyToken
                        - sellToken
                        additionalProperties: false
                        description: Swap-related metadata for the buy and sell token in the swap
                      totalNetworkFee:
                        allOf:
                        - {}
                        - type: string
                          pattern: ^[-+]?(0|[1-9]\d*)(\.\d+)?$
                        nullable: true
                        description: The estimated total network cost of the swap. On chains where there is no L1 data cost,
                          it is calculated as `gas` * `gasPrice`. On chains where there is an L1 data cost, it is calculated
                          as `gas` * `gasPrice` + L1 data cost.
                      zid:
                        type: string
                        description: The unique ZeroEx identifier of the request
                      gas:
                        allOf:
                        - {}
                        - type: string
                          pattern: ^[-+]?(0|[1-9]\d*)(\.\d+)?$
                        nullable: true
                        description: The estimated gas limit that should be used to send the transaction to guarantee settlement
                      gasPrice:
                        allOf:
                        - {}
                        - type: string
                          pattern: ^[-+]?(0|[1-9]\d*)(\.\d+)?$
                        description: The gas price (in wei) that should be used to send the transaction. The transaction needs
                          to be sent with this `gasPrice` for the transaction to be successful
                    required:
                    - allowanceTarget
                    - blockNumber
                    - buyAmount
                    - buyToken
                    - fees
                    - issues
                    - liquidityAvailable
                    - minBuyAmount
                    - mode
                    - route
                    - sellAmount
                    - sellToken
                    - tokenMetadata
                    - totalNetworkFee
                    - zid
                    - gas
                    - gasPrice
                    additionalProperties: false
                  - type: object
                    properties:
                      allowanceTarget:
                        type: string
                        pattern: ^0x[a-fA-F0-9]{40}$
                        nullable: true
                        description: The target contract address for which the `taker` needs to have an allowance in order
                          to be able to complete the swap.
                      blockNumber:
                        allOf:
                        - {}
                        - type: string
                          pattern: ^[-+]?(0|[1-9]\d*)(\.\d+)?$
                        description: The block number at which the liquidity sources were sampled to generate the quote. This
                          indicates the freshness of the quote
                      buyAmount:
                        allOf:
                        - {}
                        - type: string
                          pattern: ^[-+]?(0|[1-9]\d*)(\.\d+)?$
                        description: The exact amount of `buyToken` (in `buyToken` units) requested for the swap
                      buyToken:
                        type: string
                        pattern: ^0x[a-fA-F0-9]{40}$
                        description: The contract address of the token to buy in the swap
                      estimatedNetSellAmount:
                        allOf:
                        - {}
                        - type: string
                          pattern: ^[-+]?(0|[1-9]\d*)(\.\d+)?$
                        description: The estimated net amount of `sellToken` spent after any exact-out refund route executes
                      fees:
                        type: object
                        properties:
                          integratorFee:
                            type: object
                            properties:
                              amount:
                                allOf:
                                - {}
                                - type: string
              

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