> ## Documentation Index > Fetch the complete documentation index at: https://developers.circle.com/llms.txt > Use this file to discover all available pages before exploring further. # Estimate a contract deployment > Estimate the network fee for deploying a smart contract on a specified blockchain, given the contract bytecode. ## OpenAPI ````yaml openapi/smart-contract-platform.yaml post /v1/w3s/contracts/deploy/estimateFee openapi: 3.0.3 info: description: This is the Circle Contracts API documentation. title: Circle Contracts version: '1.0' servers: - url: https://api.circle.com security: - BearerAuth: [] tags: - name: Templates - name: View / Update - name: Interact - name: Deploy / Import - name: Event Monitors paths: /v1/w3s/contracts/deploy/estimateFee: post: tags: - Deploy / Import summary: Estimate a contract deployment description: >- Estimate the network fee for deploying a smart contract on a specified blockchain, given the contract bytecode. operationId: estimateContractDeploy parameters: - $ref: '#/components/parameters/XRequestId' requestBody: $ref: '#/components/requestBodies/ContractDeploymentEstimateFee' responses: '200': content: application/json: schema: $ref: '#/components/schemas/FeeEstimation' description: Estimate is successful. headers: X-Request-Id: $ref: '#/components/headers/XRequestId' '400': content: application/json: schema: $ref: '#/components/schemas/Error' description: Error response for the request. headers: X-Request-Id: $ref: '#/components/headers/XRequestId' security: - BearerAuth: [] components: parameters: XRequestId: name: X-Request-Id in: header description: > Developer-provided identifier for this request, used for tracing requests in Wallets API logs and the Developer Console, and when communicating with Circle Support. **Must be a UUID to appear in logs.** Non-UUID values are accepted by the API but are ignored by logging and tracing systems. schema: $ref: '#/components/schemas/XRequestId' requestBodies: ContractDeploymentEstimateFee: content: application/json: schema: title: ContractDeploymentEstimateFeeRequest type: object required: - bytecode properties: abiJson: $ref: '#/components/schemas/AbiJson' blockchain: $ref: '#/components/schemas/Blockchain' bytecode: $ref: '#/components/schemas/Bytecode' constructorSignature: $ref: '#/components/schemas/ConstructorSignature' constructorParameters: $ref: '#/components/schemas/ConstructorParameters' sourceAddress: $ref: '#/components/schemas/SourceAddress' walletId: $ref: '#/components/schemas/WalletId' examples: Wallet ID: value: walletId: 004735f6-d9fc-44f8-933c-672cdf3d240d bytecode: 0x60806040523480156200001157600080fd5b50604051806040... constructorSignature: constructor(string, uint256) constructorParameters: - TICK - 10000 Source Address: value: sourceAddress: '0x1bf9ad0cc2ad298c69a2995aa806ee832788218c' blockchain: MATIC-AMOY bytecode: 0x60806040523480156200001157600080fd5b50604051806040... constructorSignature: constructor(string ticker, uint256 totalSupply) constructorParameters: - TICK - 10000 description: Estimate a transaction fee for deploying a smart contract required: true schemas: FeeEstimation: title: FeeEstimationResponse type: object required: - data properties: data: type: object properties: high: $ref: '#/components/schemas/TransactionFee' low: $ref: '#/components/schemas/TransactionFee' medium: $ref: '#/components/schemas/TransactionFee' Error: title: Error type: object required: - code - message properties: code: type: integer description: Code that corresponds to the error. message: type: string description: Message that describes the error. XRequestId: type: string format: uuid description: >- A unique identifier, which can be helpful for identifying a request when communicating with Circle support. example: 2adba88e-9d63-44bc-b975-9b6ae3440dde AbiJson: type: string description: The contract's ABI in a JSON stringified format. example: >- [{"inputs": [],"stateMutability": "nonpayable","type": "constructor"},... Blockchain: type: string description: > The blockchain network that the resource is to be created on or is currently on. Required along with `sourceAddress` if you don't provide `walletId`. The `blockchain` and `walletId` fields are mutually exclusive. enum: - ETH - ETH-SEPOLIA - MATIC - MATIC-AMOY - ARB - ARB-SEPOLIA - UNI - UNI-SEPOLIA - BASE - BASE-SEPOLIA - OP - OP-SEPOLIA - AVAX - AVAX-FUJI - ARC-TESTNET - MONAD - MONAD-TESTNET example: MATIC-AMOY Bytecode: type: string description: Bytecode of the contract being deployed. minLength: 1 writeOnly: true example: 0x60806040523480156200001157600080fd5b50604051806040... ConstructorSignature: title: ConstructorSignature type: string description: >- Signature of the constructor if the contract has one. constructor() by default. maxLength: 1000 minLength: 1 example: constructor(string ticker, uint256 totalSupply) ConstructorParameters: title: ConstructorParameters type: array description: >- A list of arguments to pass to the contract's constructor function. Must be an empty array if there are no constructor parameters. items: $ref: '#/components/schemas/AnyValue' example: - TICK - 10000 SourceAddress: type: string description: > Source address of the transaction. Required along with `blockchain` if `walletId` is not provided. The `sourceAddress` and `walletId` fields are mutually exclusive. example: '0x1bf9ad0cc2ad298c69a2995aa806ee832788218c' WalletId: title: WalletId type: string format: uuid description: | Unique system generated identifier of the wallet. For contract deploys this wallet ID will be used as the source. example: a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11 TransactionFee: type: object properties: gasLimit: $ref: '#/components/schemas/GasLimit' gasPrice: $ref: '#/components/schemas/GasPrice' maxFee: $ref: '#/components/schemas/MaxFee' priorityFee: $ref: '#/components/schemas/PriorityFee' baseFee: $ref: '#/components/schemas/BaseFee' networkFee: $ref: '#/components/schemas/NetworkFee' networkFeeRaw: $ref: '#/components/schemas/NetworkFeeRaw' l1Fee: $ref: '#/components/schemas/L1Fee' AnyValue: description: Can be any value - string, number, boolean, array or object. GasLimit: type: string description: > The maximum units of gas to use for the transaction. Required if `feeLevel` is not provided. Estimates for this limit can be obtained through the [`POST /transactions/transfer/estimateFee`](/api-reference/w3s/developer-controlled-wallets/create-transfer-estimate-fee) API. An insufficient gas limit may cause the transaction to fail on-chain. Use this field with care when manually providing values. GasLimit override (only supported for EOA wallets): Using `gasLimit` together with `feeLevel`, the provided `gasLimit` will override the estimation's gasLimit. example: '21000' GasPrice: type: string description: > For blockchains without EIP-1559 support, the maximum price of gas, in gwei, to use per each unit of gas (see `gasLimit`). Requires `gasLimit`. Cannot be used with `feeLevel`, `priorityFee`, or `maxFee`. Estimates for this fee can be obtained through the [`POST /transactions/transfer/estimateFee`](/api-reference/w3s/developer-controlled-wallets/create-transfer-estimate-fee) API. The wallet service enforces a dynamic minimum `gasPrice` based on current network conditions. Requests specifying a `gasPrice` below this minimum will be rejected MaxFee: type: string example: '5.935224468' description: > For blockchains with EIP-1559 support, the maximum price per unit of gas (see `gasLimit`), in gwei. Requires `priorityFee`, and `gasLimit` to be present. Cannot be used with `feeLevel` or `gasPrice`. Estimates for this fee can be obtained through the [`POST /transactions/transfer/estimateFee`](/api-reference/w3s/developer-controlled-wallets/create-transfer-estimate-fee) API. PriorityFee: type: string example: '1.022783914' description: > For blockchains with EIP-1559 support, the “tip”, in gwei, to add to the base fee as an incentive for validators. Please note that the `maxFee` and `gasLimit` parameters are required alongside the `priorityFee`. The `feeLevel` and `gasPrice` parameters cannot be used with the `priorityFee`. Estimations for this fee can be obtained through the [`POST /transactions/transfer/estimateFee`](/api-reference/w3s/developer-controlled-wallets/create-transfer-estimate-fee) API. The wallet service enforces a dynamic minimum `priorityFee` based on current network conditions. Requests specifying a `priorityFee` below this minimum will be rejected BaseFee: type: string example: '1.022783914' description: > For blockchains with EIP-1559 support, the estimated base fee represents the minimum fee required for a transaction to be included in a block on the blockchain. It is measured in gwei and compensates for the computational resources validators consume to process the transaction. The base fee is supplemented by a separate "tip" called the priority fee, which acts as an extra incentive for validators to prioritize the transaction. The priority fee is added to the base fee to calculate the final transaction fee. NetworkFee: type: string example: '0.0001246397138' description: > The estimated network fee is the maximum amount of cryptocurrency (such as ETH, ARB, or SOL) that you will pay for your transaction. This fee depends on the parameters you set, including Gas Limit, Priority Fee, and Max Fee. It compensates for the computational resources that validators consume to process the transaction. It is measured in native token such as ETH, SOL. For blockchains with L1 data fees such as OP/BASE, the network fee is a combination of the Execution Gas Fee and the L1 Data Fee. Each blockchain might use different formula for network fee. Refer to each specific blockchain's documentation to understand how `networkFee` is calculated. NetworkFeeRaw: type: string example: '0.0001246397138' description: > Similar to `networkFee`, `networkFeeRaw` is an estimation with lower buffer and thus should be closer to the actual on-chain expense. This field will only be returned in the estimation response. L1Fee: type: string example: '0.000000000000140021' description: > This fee represents the Layer 1 (L1) rollup charge associated with transactions on Layer 2 blockchains. The amount is expressed in the native currency, such as ETH. This field is relevant for Layer 2 blockchains utilizing a rollup mechanism and for specific account types, such as externally owned accounts (EOAs) on the Optimism (OP) blockchain. headers: XRequestId: description: > Developer-provided header parameter or Circle-generated universally unique identifier (UUID v4). Useful for identifying a specific request when communicating with Circle Support. schema: $ref: '#/components/schemas/XRequestId' securitySchemes: BearerAuth: type: http scheme: bearer bearerFormat: PREFIX:ID:SECRET description: >- Circle's API Keys are formatted in the following structure "PREFIX:ID:SECRET". All three parts are required to make a successful request. ````