> ## Documentation Index > Fetch the complete documentation index at: https://docs.getpara.com/llms.txt > Use this file to discover all available pages before exploring further. # Estimate Transfer Fee > Estimate the fee for a transfer without signing or broadcasting. Accepts the same core parameters as the transfer endpoint. Fees are advisory and subject to network conditions. **EVM:** Returns `gasLimit`, `maxFeePerGas`, `maxPriorityFeePerGas`, and `transactionType` alongside the `estimatedFee` in the native currency. **Solana:** Returns only `estimatedFee` in SOL. The response may include a `warning` field if estimation used fallback heuristics (e.g. when the RPC node could not simulate the transaction). ## OpenAPI ````yaml /openapi.yaml post /v1/wallets/{walletId}/estimate-fee openapi: 3.0.3 info: title: Para REST API version: '1.0' description: Server-to-server wallet creation and signing over HTTP servers: - url: https://api.beta.getpara.com description: Beta - url: https://api.getpara.com description: Production security: - ApiKeyAuth: [] paths: /v1/wallets/{walletId}/estimate-fee: post: tags: - Signing summary: Estimate Transfer Fee description: | Estimate the fee for a transfer without signing or broadcasting. Accepts the same core parameters as the transfer endpoint. Fees are advisory and subject to network conditions. **EVM:** Returns `gasLimit`, `maxFeePerGas`, `maxPriorityFeePerGas`, and `transactionType` alongside the `estimatedFee` in the native currency. **Solana:** Returns only `estimatedFee` in SOL. The response may include a `warning` field if estimation used fallback heuristics (e.g. when the RPC node could not simulate the transaction). operationId: estimateFee parameters: - $ref: '#/components/parameters/WalletId' - $ref: '#/components/parameters/RequestId' requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/EstimateFeeRequest' responses: '200': description: Fee estimate content: application/json: schema: $ref: '#/components/schemas/EstimateFeeResponse' '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '404': $ref: '#/components/responses/NotFound' '429': $ref: '#/components/responses/TooManyRequests' '500': $ref: '#/components/responses/ServerError' components: parameters: WalletId: name: walletId in: path required: true description: Wallet ID schema: type: string example: 0a1b2c3d-4e5f-6789-abcd-ef0123456789 RequestId: name: X-Request-Id in: header required: false description: UUID for request tracing. Para returns one if omitted. schema: type: string format: uuid schemas: EstimateFeeRequest: type: object required: - to - value properties: to: type: string description: Destination address example: 0x742d35Cc6634C0532925a3b844Bc9e7595f... value: type: string description: Transfer amount in smallest unit (wei for ETH, lamports for SOL) example: '1000000000000000' chainId: oneOf: - type: string - type: integer description: Chain ID. Required for EVM wallets, ignored for Solana. example: '1' tokenAddress: type: string description: >- Token contract address. EVM: ERC-20 contract. Solana: SPL mint address. network: type: string enum: - SOLANA - SOLANA_DEVNET description: >- Solana network. In production, defaults to SOLANA. In beta, only SOLANA_DEVNET is allowed (and is the default). EstimateFeeResponse: type: object required: - estimatedFee - transferAmount - currency properties: estimatedFee: type: string description: >- Estimated fee in standard units of the native currency (e.g. ETH, SOL) example: '0.000756' transferAmount: type: string description: Transfer amount in standard units of the native currency example: '0.001' currency: type: string description: Native currency symbol (e.g. ETH, SOL) example: ETH gasLimit: type: string description: Estimated gas limit. EVM only. example: '25200' maxFeePerGas: type: string description: EIP-1559 max fee per gas (in wei). EVM only. example: '30000000000' maxPriorityFeePerGas: type: string description: EIP-1559 max priority fee per gas (in wei). EVM only. example: '2000000000' gasPrice: type: string description: Legacy gas price (in wei). EVM legacy transactions only. example: '30000000000' warning: type: string description: Present if estimation used fallback heuristics Error: type: object required: - code - message properties: code: type: string description: Machine-readable error code for programmatic handling example: INVALID_REQUEST message: type: string description: Human-readable error message transactionId: type: string format: uuid description: >- Persisted transaction record id. Present only when a broadcast request failed after a history row was created. failureStage: type: string enum: - mpc_sign - signature_apply - signer_verify - broadcast - monitor_timeout description: >- Which stage of the broadcast lifecycle failed. Present on persisted broadcast failures. failureCode: type: string description: >- Machine-readable failure reason from the underlying broadcast helper (e.g. `INSUFFICIENT_NATIVE_BALANCE`, `EXECUTION_FAILED`). Present on broadcast-stage failures. signedTransaction: type: string description: >- Signed transaction bytes. Present on broadcast failures that happen after signing completed. additionalProperties: true description: > All error responses include `code` and `message` fields. Some errors include extra fields (e.g. `walletId` on 409 Conflict). Broadcast failures that occur after a persisted transaction row is created include `transactionId`, `failureStage`, and (on broadcast-stage failures) `failureCode`, and also set the `x-transaction-id` response header. If signing completed before the failure, `signedTransaction` is included so callers can inspect or retry the already-signed bytes. Common error codes: `INVALID_REQUEST`, `UNAUTHORIZED`, `FORBIDDEN`, `NOT_FOUND`, `CONFLICT`, `WALLET_ALREADY_EXISTS`, `WALLET_ALREADY_CLAIMED`, `RATE_LIMITED`, `INTERNAL_ERROR`. responses: BadRequest: description: Invalid request body content: application/json: schema: $ref: '#/components/schemas/Error' example: code: INVALID_REQUEST message: type must be one of EVM, SOLANA, COSMOS, STELLAR Unauthorized: description: API key not provided content: application/json: schema: $ref: '#/components/schemas/Error' example: code: UNAUTHORIZED message: secret api key not provided NotFound: description: Wallet not found content: application/json: schema: $ref: '#/components/schemas/Error' example: code: NOT_FOUND message: wallet not found TooManyRequests: description: Rate limit exceeded headers: Retry-After: schema: type: integer description: Seconds until the rate limit window resets example: 60 content: application/json: schema: $ref: '#/components/schemas/Error' example: code: RATE_LIMITED message: Rate limit exceeded, try again shortly. ServerError: description: Internal server error content: application/json: schema: $ref: '#/components/schemas/Error' example: code: INTERNAL_ERROR message: Internal Server Error securitySchemes: ApiKeyAuth: type: apiKey in: header name: X-API-Key description: Your partner secret key (server-side only) x-default: sk_your_secret_key_here ````