> ## Documentation Index > Fetch the complete documentation index at: https://developers.circle.com/llms.txt > Use this file to discover all available pages before exploring further. # Repay a settlement advance > Records a repayment against the credit line backing a settlement advance. Any excess would be balance of the Circle Mint account. **Rounding**: for USDC and EURC repayments, the amount should be rounded up to 2 decimal places. Other stablecoins (e.g. MXNB, QCAD, AUDF, ZARU) are not subject to rounding. Idempotent on `idempotencyKey`: replays with the same key and same amount are no-ops. ## OpenAPI ````yaml openapi/stablefx.yaml post /v1/exchange/stablefx/settlementAdvance/repayment openapi: 3.1.0 info: title: StableFX API description: > The StableFX API provides endpoints for trading stablecoins. ## Authentication All API requests require authentication using an API key. ## Base URL The base URL for all API endpoints is: `https://api.circle.com/v1/exchange/stablefx` version: 1.0.0 servers: - url: https://api.circle.com description: StableFX API server security: - BearerAuth: [] tags: - name: Quotes description: Endpoints for creating and managing quotes - name: Trades description: Endpoints for creating and managing trades - name: Signatures description: Endpoints for retrieving presign typed data and registering signatures - name: Fees description: Endpoints for retrieving fees - name: Funding description: Endpoints for funding trades - name: Webhook Subscriptions description: Manage subscriptions to notifications - name: Settlement Advance description: Request, track, and repay settlement advances. paths: /v1/exchange/stablefx/settlementAdvance/repayment: post: tags: - Settlement Advance summary: Repay a settlement advance description: > Records a repayment against the credit line backing a settlement advance. Any excess would be balance of the Circle Mint account. **Rounding**: for USDC and EURC repayments, the amount should be rounded up to 2 decimal places. Other stablecoins (e.g. MXNB, QCAD, AUDF, ZARU) are not subject to rounding. Idempotent on `idempotencyKey`: replays with the same key and same amount are no-ops. operationId: repaySettlementAdvance requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/RepaySettlementAdvance' responses: '201': description: Repayment recorded successfully. headers: X-Request-Id: $ref: '#/components/headers/XRequestId' content: application/json: schema: $ref: '#/components/schemas/SettlementAdvanceRepayment' '400': description: Invalid request or repayment rejected. content: application/json: schema: $ref: '#/components/schemas/Error' '404': description: Credit line not found. content: application/json: schema: $ref: '#/components/schemas/Error' '409': description: Idempotency key reused with different request parameters. content: application/json: schema: $ref: '#/components/schemas/Error' security: - BearerAuth: [] components: schemas: RepaySettlementAdvance: type: object description: Request body for repaying a settlement advance. required: - idempotencyKey - amount properties: idempotencyKey: $ref: '#/components/schemas/IdempotencyKey' amount: $ref: '#/components/schemas/SettlementAdvanceCurrencyAmount' SettlementAdvanceRepayment: type: object description: Settlement advance repayment. required: - id - amount - status - createDate - updateDate properties: id: $ref: '#/components/schemas/Id' amount: $ref: '#/components/schemas/SettlementAdvanceCurrencyAmount' status: $ref: '#/components/schemas/RepaymentStatus' createDate: $ref: '#/components/schemas/CreateDate' updateDate: $ref: '#/components/schemas/UpdateDate' Error: title: Error type: object required: - code - message properties: code: $ref: '#/components/schemas/ErrorCode' message: type: string description: Human-readable message that describes the error. example: Unknown error occurred errors: type: array description: Array of detailed error descriptions items: $ref: '#/components/schemas/DescriptiveError' IdempotencyKey: type: string description: >- Universally unique identifier (UUID v4) idempotency key. This key is utilized to ensure exactly-once execution of mutating requests. To create a UUIDv4 go to [uuidgenerator.net](https://www.uuidgenerator.net). If the same key is reused, it will be treated as the same request and the original response will be returned. example: a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11 format: uuid SettlementAdvanceCurrencyAmount: type: object description: Currency and amount for settlement advance flows. required: - currency - amount properties: currency: $ref: '#/components/schemas/SettlementAdvanceCurrency' amount: $ref: '#/components/schemas/Amount' XRequestId: type: string description: >- A unique identifier, which can be helpful for identifying a request when communicating with Circle support. example: 2adba88e-9d63-44bc-b975-9b6ae3440dde format: uuid Id: type: string format: uuid description: System-generated unique identifier of the resource. example: c4d1da72-111e-4d52-bdbf-2e74a2d803d5 RepaymentStatus: type: string description: Status of a settlement advance repayment. enum: - pending - completed - failed example: pending CreateDate: type: string format: date-time description: Date and time when the resource was created example: '2023-01-01T12:04:05Z' UpdateDate: type: string format: date-time description: Date and time when the resource was last updated example: '2023-01-01T12:04:05Z' ErrorCode: title: ErrorCode type: integer description: The code that corresponds to the error. enum: - -1 - 0 - 1 - 2 - 3 - 400 - 401 - 403 - 404 DescriptiveError: title: DescriptiveError type: object required: - error - message properties: error: $ref: '#/components/schemas/DescriptiveErrorType' location: type: - string - 'null' description: The key or path where the error occurred message: type: string description: Detailed description of the error SettlementAdvanceCurrency: type: string description: Currency code for settlement advance flows. example: USDC Amount: type: string pattern: ^\d+(?:\.\d{1,6})?$ description: Amount of currency, formatted as a string with up to six decimal places. example: '100.00' DescriptiveErrorType: title: DescriptiveErrorType type: string enum: - MISSING_OR_INVALID_FIELD description: Type of descriptive error headers: XRequestId: description: > Circle-generated universally unique identifier (UUID v4). Useful for identifying a specific request when communicating with Circle Support. schema: $ref: '#/components/schemas/XRequestId' securitySchemes: BearerAuth: type: http scheme: bearer bearerFormat: PREFIX:ID:SECRET description: >- Circle's API Keys are formatted in the following structure "PREFIX:ID:SECRET". All three parts are requred to make a successful request. ````