> ## Documentation Index > Fetch the complete documentation index at: https://cobo.com/products/agentic-wallet/manual/llms.txt > Use this file to discover all available pages before exploring further. # Estimate contract call fee > This operation estimates the network fee for a contract call without submitting a transaction. You can use the returned `recommended`, `slow`, and `fast` fee options when constructing the contract call request. ## OpenAPI ````yaml post /api/v1/wallets/{wallet_uuid}/estimate-contract-call-fee openapi: 3.1.0 info: title: Cobo Agentic Wallet Service description: Unified wallet engine for human and agent principals version: 1.3.0 servers: [] security: [] paths: /api/v1/wallets/{wallet_uuid}/estimate-contract-call-fee: post: tags: - Transactions summary: Estimate contract call fee description: >- This operation estimates the network fee for a contract call without submitting a transaction. You can use the returned `recommended`, `slow`, and `fast` fee options when constructing the contract call request. operationId: estimate_contract_call_fee parameters: - name: wallet_uuid in: path required: true schema: type: string format: uuid description: >- The UUID of the wallet for which to estimate the contract call fee. Retrieve this value from the `id` field returned when the wallet was created. title: Wallet Uuid description: >- The UUID of the wallet for which to estimate the contract call fee. Retrieve this value from the `id` field returned when the wallet was created. - name: X-API-Key in: header required: false schema: title: X-Api-Key type: string nullable: true requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/EstimateContractCallFeeRequest' responses: '200': description: Successful Response content: application/json: schema: $ref: '#/components/schemas/StandardResponse_EstimateTransferFeeRead_' '422': description: Validation Error content: application/json: schema: $ref: '#/components/schemas/WrappedValidationError' components: schemas: EstimateContractCallFeeRequest: properties: chain_id: type: string maxLength: 100 minLength: 1 title: Chain Id description: >- The Cobo chain ID for this contract call (for example, `SETH`, `BASE_ETH`, `SOL`). contract_addr: title: Contract Addr description: The EVM contract address to call. Required for EVM chains. type: string maxLength: 255 nullable: true value: type: string maxLength: 100 minLength: 1 title: Value description: >- The ETH value to send with the call, in whole token units (not wei), as a decimal string. Defaults to `0`. default: '0' calldata: title: Calldata description: The ABI-encoded calldata as a hex string. type: string maxLength: 8192 nullable: true instructions: title: Instructions description: Solana instructions for this call. Required for Solana chains. items: $ref: '#/components/schemas/SolInstruction' type: array nullable: true address_lookup_table_accounts: title: Address Lookup Table Accounts description: Optional Solana address lookup table accounts. items: $ref: '#/components/schemas/SolAddressLookupTableAccount' type: array nullable: true src_addr: title: Src Addr description: >- The source address. If omitted, the wallet's most recently created address for this chain is used. type: string maxLength: 255 nullable: true type: object required: - chain_id title: EstimateContractCallFeeRequest description: Request payload for contract-call fee estimation. StandardResponse_EstimateTransferFeeRead_: properties: success: type: boolean title: Success default: true result: $ref: '#/components/schemas/EstimateTransferFeeRead' suggestion: type: string title: Suggestion default: '' message: type: string title: Message default: '' meta: $ref: '#/components/schemas/PaginationMeta' nullable: true type: object required: - result title: StandardResponse[EstimateTransferFeeRead] WrappedValidationError: title: WrappedValidationError type: object required: - success - error properties: success: type: boolean const: false default: false title: Success error: type: object title: Error required: - detail properties: detail: type: array title: Detail items: $ref: '#/components/schemas/ValidationError' SolInstruction: properties: program_id: type: string minLength: 1 title: Program Id description: The Solana program ID to invoke. accounts: items: $ref: '#/components/schemas/SolInstructionAccount' type: array title: Accounts description: The accounts involved in this instruction. data: type: string minLength: 1 title: Data description: The instruction data as a base64-encoded string. type: object required: - program_id - accounts - data title: SolInstruction description: Solana contract call instruction. SolAddressLookupTableAccount: properties: alt_account_key: type: string minLength: 1 title: Alt Account Key description: The address lookup table's public key. addresses: items: type: string type: array title: Addresses description: The list of addresses in this lookup table. type: object required: - alt_account_key - addresses title: SolAddressLookupTableAccount description: Solana address lookup table account. EstimateTransferFeeRead: properties: fee_type: title: Fee Type description: The fee model type (for example, `EVM_EIP_1559`, `SOL`). type: string nullable: true token_id: title: Token Id description: The token used to pay fees. type: string nullable: true recommended: $ref: '#/components/schemas/FeeEstimateRead' description: The recommended fee estimate, balancing speed and cost. slow: $ref: '#/components/schemas/FeeEstimateRead' description: A lower-cost fee estimate with slower confirmation. fast: $ref: '#/components/schemas/FeeEstimateRead' description: A higher-cost fee estimate with faster confirmation. type: object title: EstimateTransferFeeRead description: Fee estimation response payload. PaginationMeta: properties: total: title: Total type: integer nullable: true offset: title: Offset type: integer nullable: true limit: title: Limit type: integer nullable: true has_more: title: Has More type: boolean nullable: true after: title: After type: string nullable: true before: title: Before type: string nullable: true type: object title: PaginationMeta description: |- Pagination metadata for list responses. Supports both legacy offset-based and cursor-based pagination. Cursor fields (``has_more``, ``after``, ``before``) are populated for cursor-paginated endpoints. Legacy fields (``offset``, ``limit``) are populated when the caller uses the deprecated ``offset`` parameter. ValidationError: properties: loc: items: anyOf: - type: string - type: integer type: array title: Location msg: type: string title: Message type: type: string title: Error Type input: title: Input ctx: type: object title: Context type: object required: - loc - msg - type title: ValidationError SolInstructionAccount: properties: pubkey: type: string minLength: 1 title: Pubkey description: The account's public key. is_signer: type: boolean title: Is Signer description: Whether this account must sign the transaction. is_writable: type: boolean title: Is Writable description: Whether this account will be modified by the instruction. type: object required: - pubkey - is_signer - is_writable title: SolInstructionAccount description: Solana instruction account. FeeEstimateRead: properties: max_fee_per_gas: title: Max Fee Per Gas description: The maximum total fee per gas for EIP-1559 transactions, in wei. type: string nullable: true max_priority_fee_per_gas: title: Max Priority Fee Per Gas description: >- The maximum priority fee (tip) per gas for EIP-1559 transactions, in wei. type: string nullable: true gas_limit: title: Gas Limit description: The estimated gas limit for EIP-1559 transactions. type: string nullable: true compute_unit_price: title: Compute Unit Price description: >- The price per compute unit for Solana transactions, in microlamports. type: string nullable: true compute_unit_limit: title: Compute Unit Limit description: The maximum compute units for Solana transactions. type: string nullable: true fee_amount: title: Fee Amount description: The total estimated fee amount as a decimal string. type: string nullable: true type: object title: FeeEstimateRead description: Standardized fee estimate view (supports both EVM and SOL fields). ````