> ## Documentation Index > Fetch the complete documentation index at: https://cobo.com/developers/llms.txt > Use this file to discover all available pages before exploring further. # Check Fee Station usage > This operation evaluates Fee Station usage for the current transaction. It determines whether Fee station can be used, checks if the Fee Station balance is sufficient, and returns a breakdown of the amounts involved, including any portion that must be covered by the user or sponsored in USD stablecoin. Try [Cobo WaaS Skill](/v2/guides/overview/cobo-waas-skill) in your AI coding assistant (Claude Code, Cursor, etc.). Describe your needs in natural language to auto-generate production-ready SDK code and debug faster 🚀 ```python Python theme={null} import cobo_waas2 from cobo_waas2.models.fee_station_check_fee_station_usage import ( FeeStationCheckFeeStationUsage, ) from cobo_waas2.models.fee_station_check_fee_station_usage_response import ( FeeStationCheckFeeStationUsageResponse, ) from cobo_waas2.rest import ApiException from pprint import pprint # See configuration.py for a list of all supported configurations. configuration = cobo_waas2.Configuration( # Replace `` with your private key api_private_key="", # Select the development environment. To use the production environment, change the URL to https://api.cobo.com/v2. host="https://api.dev.cobo.com/v2", ) # Enter a context with an instance of the API client with cobo_waas2.ApiClient(configuration) as api_client: # Create an instance of the API class api_instance = cobo_waas2.FeeStationApi(api_client) fee_station_check_fee_station_usage = cobo_waas2.FeeStationCheckFeeStationUsage( request_id="f47ac10b-58cc-4372-a567-0e02b2c3d479", amount="100.5", token_id="ETH_USDT", estimated_fee_amount="0.0021", from_address="0x1234567890abcdef1234567890abcdef12345678", from_wallet_id="f47ac10b-58cc-4372-a567-0e02b2c3d479" ) try: # Check Fee Station usage api_response = api_instance.check_fee_station_usage( fee_station_check_fee_station_usage=fee_station_check_fee_station_usage ) print("The response of FeeStationApi->check_fee_station_usage:\n") pprint(api_response) except Exception as e: print("Exception when calling FeeStationApi->check_fee_station_usage: %s\n" % e) ``` ```java Java theme={null} // Import classes: import com.cobo.waas2.ApiClient; import com.cobo.waas2.ApiException; import com.cobo.waas2.Configuration; import com.cobo.waas2.Env; import com.cobo.waas2.api.FeeStationApi; import com.cobo.waas2.model.*; public class Example { public static void main(String[] args) { ApiClient defaultClient = Configuration.getDefaultApiClient(); // Select the development environment. To use the production environment, replace `Env.DEV` with // `Env.PROD defaultClient.setEnv(Env.DEV); // Replace `` with your private key defaultClient.setPrivKey(""); FeeStationApi apiInstance = new FeeStationApi(); FeeStationCheckFeeStationUsage feeStationCheckFeeStationUsage = new FeeStationCheckFeeStationUsage(); try { FeeStationCheckFeeStationUsageResponse result = apiInstance.checkFeeStationUsage(feeStationCheckFeeStationUsage); System.out.println(result); } catch (ApiException e) { System.err.println("Exception when calling FeeStationApi#checkFeeStationUsage"); System.err.println("Status code: " + e.getCode()); System.err.println("Reason: " + e.getResponseBody()); System.err.println("Response headers: " + e.getResponseHeaders()); e.printStackTrace(); } } } ``` ```go Go theme={null} package main import ( "context" "fmt" coboWaas2 "github.com/CoboGlobal/cobo-waas2-go-sdk/cobo_waas2" "github.com/CoboGlobal/cobo-waas2-go-sdk/cobo_waas2/crypto" "os" ) func main() { feeStationCheckFeeStationUsage := *coboWaas2.NewFeeStationCheckFeeStationUsage("f47ac10b-58cc-4372-a567-0e02b2c3d479", "100.5", "ETH_USDT", "0.0021", "0x1234567890abcdef1234567890abcdef12345678", "f47ac10b-58cc-4372-a567-0e02b2c3d479") configuration := coboWaas2.NewConfiguration() // Initialize the API client apiClient := coboWaas2.NewAPIClient(configuration) ctx := context.Background() // Select the development environment. To use the production environment, replace coboWaas2.DevEnv with coboWaas2.ProdEnv ctx = context.WithValue(ctx, coboWaas2.ContextEnv, coboWaas2.DevEnv) // Replace `` with your private key ctx = context.WithValue(ctx, coboWaas2.ContextPortalSigner, crypto.Ed25519Signer{ Secret: "", }) resp, r, err := apiClient.FeeStationAPI.CheckFeeStationUsage(ctx). FeeStationCheckFeeStationUsage(feeStationCheckFeeStationUsage). Execute() if err != nil { fmt.Fprintf( os.Stderr, "Error when calling `FeeStationAPI.CheckFeeStationUsage``: %v\n", err, ) fmt.Fprintf(os.Stderr, "Full HTTP response: %v\n", r) } // response from `CheckFeeStationUsage`: FeeStationCheckFeeStationUsageResponse fmt.Fprintf(os.Stdout, "Response from `FeeStationAPI.CheckFeeStationUsage`: %v\n", resp) } ``` ```javascript JavaScript theme={null} const CoboWaas2 = require("@cobo/cobo-waas2"); // Initialize the API client const apiClient = CoboWaas2.ApiClient.instance; // Select the development environment. To use the production environment, replace `Env.DEV` with `Env.PROD` apiClient.setEnv(CoboWaas2.Env.DEV); // Replace `` with your private key apiClient.setPrivateKey(""); // Call the API const apiInstance = new CoboWaas2.FeeStationApi(); const opts = { FeeStationCheckFeeStationUsage: new CoboWaas2.FeeStationCheckFeeStationUsage(), }; apiInstance.checkFeeStationUsage(opts).then( (data) => { console.log("API called successfully. Returned data: " + data); }, (error) => { console.error(error); }, ); ``` ## OpenAPI ````yaml post /fee_station/check_fee_station_usage openapi: 3.0.3 info: title: Cobo Wallet as a Service 2.0 description: > The Cobo Wallet-as-a-Service (WaaS) 2.0 API is the latest version of Cobo's WaaS API offering. It enables you to access Cobo's full suite of crypto wallet technologies with powerful and flexible access controls. By encapsulating complex security protocols and streamlining blockchain interactions, this API allows you to concentrate on your core business activities without worrying about the safety of your assets. The WaaS 2.0 API presents the following key features: - A unified API for Cobo's [all four wallet types](https://manuals.cobo.com/en/portal/introduction#an-all-in-one-wallet-platform) - Support for 80+ chains and 3000+ tokens - A comprehensive selection of webhook events - Flexible usage models for MPC Wallets, including [Organization-Controlled Wallets](https://manuals.cobo.com/en/portal/mpc-wallets/ocw/introduction) and [User-Controlled Wallets](https://manuals.cobo.com/en/portal/mpc-wallets/ucw/introduction) - Programmatic control of smart contract wallets such as Safe{Wallet} with fine-grained access controls - Seamlessly transfer funds across multiple exchanges, including Binance, OKX, Bybit, Deribit, and more For more information about the WaaS 2.0 API, see [Introduction to WaaS 2.0](https://www.cobo.com/developers/v2/guides/overview/introduction). termsOfService: https://cobo.com/waas/tos/ license: name: Apache 2.0 url: https://www.apache.org/licenses/LICENSE-2.0.html contact: name: Cobo WaaS url: https://www.cobo.com/waas email: help@cobo.com version: 1.0.0 servers: - url: https://api.dev.cobo.com/v2 description: Development environment - url: https://api.cobo.com/v2 description: Production environment security: - CoboAuth: [] tags: - name: Organizations description: Operations related to Organizations. - name: Wallets description: Operations related to all wallets. - name: Wallets - MPC Wallets description: Operations related to mpc wallet. - name: Wallets - Exchange Wallet description: Operations related to exchange wallet. - name: Wallets - Smart Contract Wallets description: Operations related to smart contract wallet. - name: Transactions description: Operations related to all transactions. - name: Developers - Webhooks description: Operations related to webhooks. - name: Stakings description: Operations related to staking. - name: OAuth description: Operations related to OAuth. - name: Developers description: Operations related to developers. - name: AddressBooks description: Operations related to address books. - name: TravelRule description: Operations related to travel rule. - name: GraphQL description: Operations related to executing GraphQL queries and mutations. - name: PrimeBroker description: Operations related to prime broker. - name: AppWorkflows description: Operations related to app workflow. - name: FeeStation description: Operations related to fee station. - name: Payment description: Operations related to payment. - name: Batch Payouts description: Operations related to batch payouts. - name: Tokenization description: Operations related to tokenization. - name: AutoSweep description: Operations related to auto sweep. - name: Compliance description: Operations related to compliance. paths: /fee_station/check_fee_station_usage: post: tags: - FeeStation summary: Check Fee Station usage description: > This operation evaluates Fee Station usage for the current transaction. It determines whether Fee station can be used, checks if the Fee Station balance is sufficient, and returns a breakdown of the amounts involved, including any portion that must be covered by the user or sponsored in USD stablecoin. operationId: check_fee_station_usage requestBody: description: The request body for evaluating Fee Station usage. content: application/json: schema: $ref: '#/components/schemas/FeeStationCheckFeeStationUsage' responses: '201': description: The request was successful. content: application/json: schema: $ref: '#/components/schemas/FeeStationCheckFeeStationUsageResponse' 4XX: $ref: '#/components/responses/badRequestError' 5XX: $ref: '#/components/responses/internalServerError' security: - CoboAuth: [] - OAuth2: - transaction.estimate_fee components: schemas: FeeStationCheckFeeStationUsage: type: object description: The information for evaluating Fee Station usage. required: - request_id - estimated_fee_amount - from_address - from_wallet_id properties: request_id: type: string description: >- The request ID that is used to track a transaction request. The request ID is provided by you and must be unique within your organization. example: f47ac10b-58cc-4372-a567-0e02b2c3d479 amount: type: string description: >- Applicable to transfer requests only. The amount of tokens to be transferred in this request. example: '100.5' token_id: type: string description: > Applicable to transfer requests only. The token ID of the asset to be transferred. You can retrieve available token IDs by calling [List enabled tokens](https://www.cobo.com/developers/v2/api-references/wallets/list-enabled-tokens). example: ETH_USDT fee_token_id: type: string description: >- The token ID used to pay the gas fee for the main transaction. You can retrieve available token IDs by calling [List enabled tokens](https://www.cobo.com/developers/v2/api-references/wallets/list-enabled-tokens). example: ETH estimated_fee_amount: type: string description: >- The estimated transaction fee required for this transfer, before applying any Fee Station rules. example: '0.0021' from_address: type: string description: The blockchain address that initiates the transfer. example: '0x1234567890abcdef1234567890abcdef12345678' from_wallet_id: type: string format: uuid example: f47ac10b-58cc-4372-a567-0e02b2c3d479 description: The wallet ID. auto_fuel: $ref: '#/components/schemas/AutoFuelType' FeeStationCheckFeeStationUsageResponse: type: object description: The fee station evaluation result for the transfer request. required: - token_id - gas_station_type - is_fee_station_applicable - is_balance_sufficient - balance - total_fee_amount - is_sponsor_applicable - sponsored_fee_amount properties: token_id: type: string description: >- The token used to pay the gas fee for this specific transaction. You can retrieve the IDs of all supported tokens by calling [List enabled tokens](https://www.cobo.com/developers/v2/api-references/wallets/list-enabled-tokens). example: ETH balance: type: string description: The current token balance available in Fee Station. example: '0.0021' gas_station_type: $ref: '#/components/schemas/FeeStationGasStationType' is_fee_station_applicable: type: boolean description: Indicates whether Fee Station is applied for this transfer request. example: true is_balance_sufficient: type: boolean description: >- If Fee Station is used, indicates whether its balance is sufficient to cover the required gas fee. example: false total_fee_amount: type: string description: The total gas amount required for this transfer request. example: '0.0021' is_sponsor_applicable: type: boolean description: >- Indicates whether USD stablecoin sponsorship is applied when the Fee Station balance is insufficient. example: true sponsored_fee_amount: type: string description: The amount of gas fee sponsored by USD stablecoin when applicable. example: '0.0021' sponsored_token_id: type: string description: The token ID used to sponsor the gas fee. example: ETH_USDT AutoFuelType: type: string enum: - PassiveAutoFuel - ProActiveAutoFuel - UsePortalPreference - DisableAutoFuel example: PassiveAutoFuel description: > The mode of transaction fee payment using Fee Station. Currently, Fee Station supports transactions made with MPC Wallets on EVM-compatible chains, TRON, and Solana. For more details, refer to [Fee Station](https://manuals.cobo.com/en/portal/fee-station/introduction). - `ProActiveAutoFuel`: Always use Fee Station to pay transaction fees. - `PassiveAutoFuel`: Use Fee Station only when the source address balance is insufficient to cover transaction fees. - `UsePortalPreference`: Use fueling strategy based on the Portal configuration. - `DisableAutoFuel`: Do not use Fee Station for transaction fee payment under any circumstances. If this parameter is **not specified**, it defaults to the behavior of `UsePortalPreference`. **Note**: TRON and Solana does not support `PassiveAutoFuel` due to its fee delegation mechanism. FeeStationGasStationType: type: string enum: - FeeStation - CoboOperationStation example: CoboOperationStation description: > The Fee Station mode used for automatic gas payment: - `FeeStation`: The user uses their own Fee Station balance to cover the gas fee. - `CoboOperationStation`: Cobo covers the gas fee on behalf of the user. ErrorResponse: type: object description: The response of a failed request. required: - error_code - error_message - error_id properties: error_code: type: integer description: >- The error code. Refer to [Error codes and status codes](https://www.cobo.com/developers/v2/api-references/error-codes) for more details. error_message: type: string description: The error description. error_id: type: string description: >- The error log ID. You can provide the error ID when submitting a ticket to help Cobo to locate the issue. example: 0b6ddf19083c4bd1a9ca01bec44b24dd responses: badRequestError: description: >- Bad request. Your request contains malformed syntax or invalid parameters. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' internalServerError: description: Internal server error. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' securitySchemes: CoboAuth: type: apiKey in: header name: BIZ-API-KEY description: > The API key. For more details, refer to [API key](https://www.cobo.com/developers/v2/guides/overview/cobo-auth#api-key). In the API playground, enter your [API secret](https://www.cobo.com/developers/v2/guides/overview/cobo-auth#api-secret), and your API key will be accordingly calculated. OAuth2: type: oauth2 description: >- The [Org Access Token](https://www.cobo.com/developers/v2/apps/org-access-tokens). Use this authorization method only if you are developing Cobo Portal Apps for installation and use across different organizations. flows: authorizationCode: authorizationUrl: https://auth.cobo.com/authorize tokenUrl: https://auth.cobo.com/oauth/token scopes: address_book.read: Read address book api_key.read: Read API key information callback.read: Read callback message callback.resend: Resend callback message wallet.create: Create wallet wallet.read: Read wallet information wallet.update: Update wallet information wallet.delete: Delete wallet information wallet.create_address: Create wallet address wallet.manage_utxo: Manage UTXO mpc_project.create: Create MPC project mpc_project.read: Read MPC project information mpc_project.update: Update MPC project information mpc_vault.create: Create MPC Vault mpc_vault.read: Read MPC Vault information mpc_vault.update: Update MPC Vault information mpc_key_group.create: Create MPC key group mpc_key_group.read: Read MPC key group information mpc_key_group.update: Update MPC key group information mpc_key_group.delete: Delete MPC key group information transaction.read: Read transaction information transaction.withdraw: Make withdrawals transaction.estimate_fee: Estimate transaction fee transaction.contract_call: Initiate contract calls transaction.message_sign: Initiate message signings transaction.stake: Stake assets transaction.unstake: Unstake assets transaction.unstake_withdraw: Withdraw unstaked assets transaction.manage: Manage ongoing transactions transaction.update: Update transaction notes travel_rule.read: Read travel rule information travel_rule.edit: Edit travel rule information webhook.read: Read webhook URLs/events webhook.edit: Edit webhook URLs webhook.resend: Resend webhook events payment_orders_payin.create: Create pay-in order payment_orders_payin.read: Read pay-in order information payment_orders_payin.update: Update pay-in order payment_orders_refund.create: Create payment refund order payment_orders_refund.read: Read payment refund order information payment_settlement.create: Create payment settlement request payment_settlement.read: Read payment settlement request information payment_merchant.create: Create payment merchant payment_merchant.read: Read payment merchant information payment_merchant.update: Update payment merchant payment_forced_sweep.create: Create payment force sweep request payment_forced_sweep.read: Read payment force sweep request information compliance_funds.refund: Refund compliance funds request compliance_funds.isolate: Isolate compliance funds request compliance_funds.unfreeze: Unfreeze compliance funds request compliance_funds.read: Read compliance funds request information compliance_kyt_review.update: Update KYT review status compliance_kyt_decisions.update: Update KYT decision status compliance_kyt_status.read: Read KYT screening status compliance_kya_screenings.create: Create KYA address screening requests compliance_kya_screenings.read: Read KYA address screening results ````