> ## Documentation Index > Fetch the complete documentation index at: https://docs.breet.io/llms.txt > Use this file to discover all available pages before exploring further. # Estimate Network Fee > Estimate the network fee for a UTXO withdrawal (BTC, LTC, DOGE, BCH) at each fee level. Estimates are cached for 60 seconds and are not a locked quote - the fee is re-estimated when the withdrawal is submitted. ## OpenAPI ````yaml /api-reference/openapi.json post /payments/estimate-network-fee openapi: 3.0.0 info: title: BREET PUBLIC API version: 1.0.0 license: name: Proprietary url: https://breet.io/terms servers: - url: https://api.breet.io/v1 security: - appId: [] appSecret: [] breetEnv: [] tags: - name: Crypto Wallet description: Generate and manage crypto wallet addresses for receiving deposits. x-group: Wallets and Deposits - name: Withdrawals description: >- ## Withdrawals To help protect your funds, withdrawals support an additional security layer through **IP whitelisting**. ### IP Whitelisting When IP whitelisting is enabled, all withdrawal requests must originate from an approved IP address. Any withdrawal request coming from an IP not on the whitelist will be automatically blocked. You can add up to **7 IP addresses** from your dashboard. This feature is recommended for: - Production servers - Preventing unauthorized withdrawal attempts ### How it works - Enable IP whitelisting from your dashboard - Add up to 7 trusted IP addresses - Only requests from those IPs will be allowed to initiate withdrawals If IP whitelisting is disabled, withdrawals can be initiated from any IP address. - name: Banks description: List, validate, add, and remove bank accounts for fiat withdrawals. - name: Transactions description: Retrieve deposit and trade transaction history. - name: Webhooks description: >- Inspect and retry **outgoing** webhooks we send to your server (trade and withdrawal events). Requires an active integration with API access (VIP partners). For **incoming** payload shapes and verification, see the Webhooks guide in the Guides tab. - name: Assets description: >- Retrieve the list of supported deposit/sell assets and their configuration. - name: Rates and Prices description: >- Get live market prices and calculate conversion rates. These endpoints are public and do not require authentication. - name: Account description: Retrieve and update integration account details and preferences. - name: Testing description: Endpoints for testing your integration in the sandbox environment. - name: Conversion description: >- Convert between USD and local fiat (NGN | GHS). Available for both user and integration (business) flows. - name: Withdrawal addresses description: >- Add and remove withdrawal (payout) wallet addresses. If the same address, network, and token are sent with a different label, the existing address is updated. paths: /payments/estimate-network-fee: post: tags: - Withdrawals summary: Estimate Network Fee description: >- Estimate the network fee for a UTXO withdrawal (BTC, LTC, DOGE, BCH) at each fee level. Estimates are cached for 60 seconds and are not a locked quote - the fee is re-estimated when the withdrawal is submitted. operationId: estimateNetworkFee requestBody: content: application/json: schema: type: object properties: token: type: string enum: - BTC - LTC - DOGE - BCH description: >- UTXO token to withdraw. Stablecoins are not supported here - their fee is flat per network and is returned by GET /payments/supported-assets-info. amount: type: number description: >- USD value, up to 2 decimal places. Send amount or cryptoAmount, never both. cryptoAmount: type: number description: >- Value in crypto units, up to 8 decimal places. Send amount or cryptoAmount, never both. walletAddress: type: string description: >- Destination address. The estimate depends on it, so use the address you intend to withdraw to. required: - token - walletAddress description: >- Send amount or cryptoAmount, never both. One of them is required. example: token: BTC cryptoAmount: 0.01 walletAddress: bc1qar0srrr7xfkvy5l643lydnw9re59gtzzwf5mdq responses: '200': description: Fee estimates returned successfully content: application/json: example: message: data fetched success: true data: low: networkFee: 0.00001842 networkFeeUsd: 1.21 medium: networkFee: 0.00002765 networkFeeUsd: 1.82 high: networkFee: 0.00004212 networkFeeUsd: 2.77 meta: {} summary: {} stats: {} '400': description: Fee or price could not be resolved content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: success: false message: unable to fetch crypto value for BTC meta: {} errors: [] data: {} '401': $ref: '#/components/responses/Unauthorized' '422': $ref: '#/components/responses/ValidationError' '429': $ref: '#/components/responses/RateLimitExceeded' '500': $ref: '#/components/responses/InternalServerError' components: schemas: ErrorResponse: type: object required: - success - message properties: success: type: boolean enum: - false message: type: string meta: type: object errors: type: array items: type: object data: type: object RateLimitResponse: type: object required: - message properties: message: type: string responses: Unauthorized: description: Invalid or missing API credentials content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: notAuthenticated: summary: Missing credentials value: success: false message: you're not authenticated meta: {} errors: [] data: {} wrongCredentials: summary: Invalid app ID or secret value: success: false message: wrong app id and secret combination meta: {} errors: [] data: {} ValidationError: description: >- Request validation failed — check the errors array for field-level details content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: success: false message: validation errors meta: {} errors: - message: Invalid value field: amount location: body data: {} RateLimitExceeded: description: >- Too many requests — retry after the period indicated in the Retry-After header headers: Retry-After: description: Seconds until the rate limit window resets schema: type: integer X-RateLimit-Limit: description: Maximum requests allowed in the window schema: type: integer X-RateLimit-Remaining: description: Requests remaining in the current window schema: type: integer X-RateLimit-Reset: description: Unix timestamp when the window resets schema: type: integer content: application/json: schema: $ref: '#/components/schemas/RateLimitResponse' example: message: Too many requests. Please try again later. InternalServerError: description: An unexpected server error occurred content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: success: false message: something went wrong! meta: {} errors: [] data: {} securitySchemes: appId: type: apiKey in: header name: x-app-id description: Your application ID from the Breet dashboard appSecret: type: apiKey in: header name: x-app-secret description: Your application secret from the Breet dashboard breetEnv: type: apiKey in: header name: X-Breet-Env description: 'Environment selector: sandbox or production' ````