> ## Documentation Index > Fetch the complete documentation index at: https://requestnetwork-docs-openapi-secure-payments.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # Preview the fee plan for a payment > Calculation-only preview of the fee plan that would apply to a payment with the given amount, currency, and flow. Uses the same fee resolver as creation. Has no side effects: does not create a secure payment, payment request, or persist any snapshot. ## OpenAPI ````yaml /api-reference/openapi.v2.json post /v2/secure-payments/fees/preview openapi: 3.0.0 info: title: Request Network API description: API for easily creating and paying Requests with Request Network. version: 0.13.0 contact: {} servers: - url: https://api.request.network description: Production server - url: https://api.stage.request.network description: Staging server - url: http://127.0.0.1:8080 description: Local development server security: [] tags: - name: V2/Request description: Core payment request operations (V2) - name: V2/Payments description: Payment search and management operations (V2) - name: V2/Payouts description: Pay a request without creating one first (V2) - name: V2/Payer description: Crypto-to-fiat payer management operations (V2) - name: V2/Currencies description: Currency operations (V2) - name: V2/Client IDs description: Client ID management (V2) - name: V2/Secure Payment description: Secure payment operations with token-based access (V2) - name: V2/Payee Destination description: Payee destination management (V2) externalDocs: description: Request Network Docs url: https://docs.request.network/request-network-api paths: /v2/secure-payments/fees/preview: post: tags: - V2/Secure Payment summary: Preview the fee plan for a payment description: >- Calculation-only preview of the fee plan that would apply to a payment with the given amount, currency, and flow. Uses the same fee resolver as creation. Has no side effects: does not create a secure payment, payment request, or persist any snapshot. operationId: SecurePaymentController_previewFees_v2 parameters: - name: x-api-key in: header description: >- API key for authentication (optional if using Client ID, session, or orchestrator key) required: false schema: type: string - name: x-client-id in: header description: >- Client ID for frontend authentication (required when paired with orchestrator key) required: false schema: type: string - name: x-orchestrator-key in: header description: Orchestrator key for authentication (must be paired with Client ID) required: false schema: type: string - name: Authorization in: header description: >- Bearer token for session authentication (or use the session_token cookie). Only consulted when no x-orchestrator-key, x-api-key, or x-client-id header is present. required: false schema: type: string - name: Origin in: header description: >- Origin header (required for Client ID / orchestrator auth, automatically set by browser) required: false schema: type: string requestBody: required: true content: application/json: schema: type: object properties: amount: type: string description: >- Base/displayed amount in human-readable units, as a decimal string (e.g. "12.5"). currency: type: string minLength: 1 description: >- Currency symbol or currency ID (e.g. 'USDC' or 'USDC-mainnet'). Must resolve to a supported stablecoin. flow: type: string enum: - get_paid - pay description: >- `get_paid` for incoming payments (recipient creates link), `pay` for outgoing payments (payer initiates). defaultFeeBearer: type: string enum: - payer - payee description: >- Payment-level override of the flow default. Per-fee config bearer still wins. required: - amount - currency - flow examples: getPaid: summary: Get-paid preview (recipient bears fees by default) value: amount: '100' currency: USDC flow: get_paid pay: summary: Pay preview (payer bears fees by default) value: amount: '100' currency: USDC flow: pay withOverride: summary: Get-paid with payer-borne override value: amount: '100' currency: USDC flow: get_paid defaultFeeBearer: payer responses: '200': description: Fee plan preview content: application/json: schema: type: object properties: version: type: number enum: - 1 flow: type: string enum: - get_paid - pay defaultFeeBearer: type: string enum: - payer - payee grossAmountUsd: type: string netRecipientAmountUsd: type: string payerTotalAmountUsd: type: string totalFeesUsd: type: string payeeBorneFeesUsd: type: string payerBorneFeesUsd: type: string fees: type: array items: type: object properties: type: type: string label: type: string feeBearer: type: string enum: - payer - payee feeBearerSource: type: string enum: - fee_config - payment_default_override - flow_default - forced_fee_policy percentageBps: type: number capUsd: type: string nullable: true fixedAmountUsd: type: string nullable: true calculatedAmountUsd: type: string destinationResolver: type: string destinationRef: type: object properties: evmAddress: type: string tronAddress: type: string configSource: type: string required: - type - label - feeBearer - feeBearerSource - percentageBps - capUsd - calculatedAmountUsd - destinationResolver - destinationRef - configSource required: - version - flow - defaultFeeBearer - grossAmountUsd - netRecipientAmountUsd - payerTotalAmountUsd - totalFeesUsd - payeeBorneFeesUsd - payerBorneFeesUsd - fees '400': description: Unsupported currency or invalid combination '401': description: Unauthorized '429': description: Too Many Requests ````