> ## Documentation Index > Fetch the complete documentation index at: https://docs.hifi.com/llms.txt > Use this file to discover all available pages before exploring further. # Accept a swap quote > Accept the open quote for a swap and begin execution. The swap must be in `OPEN_QUOTE` status. If the source wallet has insufficient balance, the swap transitions to `QUOTE_FAILED`; otherwise it transitions to `CREATED` and is queued for execution. ## OpenAPI ````yaml https://production.hifi.com/api/v3/openapi.json post /v3/swaps/{swapId}/quote/accept openapi: 3.0.0 info: title: Hifi API version: 3.0.0 description: API documentation for HIFI servers: - url: https://production.hifi.com description: Production server - url: https://sandbox.hifi.com description: Sandbox server security: - bearerAuth: [] tags: - name: Common description: Common endpoints - name: User description: User endpoints - name: Counter Party description: Counter party endpoints - name: Crypto Transfer description: Crypto transfer and batch transfer endpoints - name: Wallet description: Wallet and wallet offer endpoints - name: External Account description: External bank account endpoints (under a counter party) - name: External Wallet description: External wallet endpoints (under a counter party) - name: External Card description: External card endpoints (under a counter party) - name: Token Swap description: Token swap endpoints - name: Bridge description: Bridge endpoints - name: Virtual Account description: Virtual account endpoints - name: Compliance description: Compliance and compliance link endpoints - name: Webhook Endpoint description: Webhook endpoint endpoints - name: File description: File upload endpoints - name: Onramp description: Onramp (fiat to crypto) endpoints - name: Offramp description: Offramp (crypto to fiat) endpoints - name: Orchestration Address description: Orchestration (liquidation) address endpoints - name: KYC Link description: Hosted and custom KYC/KYB link endpoints - name: Transfer Approval description: Transfer approval endpoints - name: Corridor description: Supported fiat/crypto transfer corridor endpoints - name: Migration description: v2-to-v3 ID mapping endpoints paths: /v3/swaps/{swapId}/quote/accept: post: tags: - Token Swap summary: Accept a swap quote description: > Accept the open quote for a swap and begin execution. The swap must be in `OPEN_QUOTE` status. If the source wallet has insufficient balance, the swap transitions to `QUOTE_FAILED`; otherwise it transitions to `CREATED` and is queued for execution. operationId: v3AcceptSwapQuote parameters: - $ref: '#/components/parameters/SwapIdPathParameter' responses: '200': $ref: '#/components/responses/AcceptSwapResponse' '400': $ref: '#/components/responses/BadRequestResponse' '401': $ref: '#/components/responses/UnauthorizedResponse' '404': $ref: '#/components/responses/NotFoundResponse' '409': $ref: '#/components/responses/ConflictResponse' '500': $ref: '#/components/responses/InternalServerErrorResponse' components: parameters: SwapIdPathParameter: name: swapId in: path required: true schema: type: string description: Public ID of the swap (prefixed with `swap_`) example: swap_7bV1aLcs3Kf9dQ2mNpXwZ responses: AcceptSwapResponse: description: > Swap quote accepted. The swap transitions to `CREATED` and is queued for execution, or to `QUOTE_FAILED` if the source wallet has insufficient balance. content: application/json: schema: $ref: '#/components/schemas/SwapObject' example: id: swap_7bV1aLcs3Kf9dQ2mNpXwZ requestId: a1b2c3d4-e5f6-4a7b-8c9d-0e1f2a3b4c5d status: CREATED error: null errorDetails: null amount: '100' source: userId: usr_3Kf9dQ2mNpXwZ7bV1aLcs walletId: wlt_3Kf9dQ2mNpXwZ7bV1aLcs currency: USDC chain: POLYGON destination: userId: usr_7bV1aLcs3Kf9dQ2mNpXwZ walletId: wlt_7bV1aLcs3Kf9dQ2mNpXwZ externalWalletId: null currency: USDT chain: POLYGON receipt: transactionHash: null quote: sendGross: amount: '100' currency: USDC sendNet: amount: '100' currency: USDC receiveGross: amount: '100' currency: USDT receiveNet: amount: '100' currency: USDT rate: '1.0' expiresAt: '2026-07-01T10:35:00.000Z' createdAt: '2026-07-01T10:30:00.000Z' updatedAt: '2026-07-01T10:33:00.000Z' BadRequestResponse: description: Bad Request — the request was malformed or failed validation. content: application/json: schema: $ref: '#/components/schemas/ApiError' example: type: VALIDATION_ERROR message: One or more fields are invalid or missing. fields: - code: invalid_value message: Must be a valid email address field: email UnauthorizedResponse: description: Unauthorized content: application/json: schema: $ref: '#/components/schemas/Unauthorized' NotFoundResponse: description: Not Found content: application/json: schema: $ref: '#/components/schemas/NotFound' ConflictResponse: description: >- Conflict — the request collides with the current state of the resource (e.g. idempotency-key reuse with a different payload). content: application/json: schema: $ref: '#/components/schemas/ApiError' example: type: RESOURCE_CONFLICT message: Resource already exists or conflicts with current state InternalServerErrorResponse: description: Internal Server Error content: application/json: schema: $ref: '#/components/schemas/InternalServerError' schemas: SwapObject: type: object description: A token swap. properties: id: type: string description: Public ID of the swap (prefixed with `swap_`). example: swap_7bV1aLcs3Kf9dQ2mNpXwZ requestId: type: string format: uuid description: Client-generated idempotency key supplied at creation. example: a1b2c3d4-e5f6-4a7b-8c9d-0e1f2a3b4c5d status: type: string enum: - DRAFT - CREATED - PENDING - OPEN_QUOTE - QUOTE_FAILED - COMPLETED - FAILED example: OPEN_QUOTE error: type: string nullable: true description: User-facing error summary. Null unless the swap failed. example: null errorDetails: type: string nullable: true description: User-facing error details. Null unless the swap failed. example: null amount: type: string nullable: true description: Source amount of the swap. example: '100' source: $ref: '#/components/schemas/SwapSourceObject' destination: $ref: '#/components/schemas/SwapDestinationObject' receipt: $ref: '#/components/schemas/SwapReceipt' quote: $ref: '#/components/schemas/SwapQuote' createdAt: type: string format: date-time example: '2026-07-01T10:30:00.000Z' updatedAt: type: string format: date-time example: '2026-07-01T10:30:00.000Z' ApiError: type: object description: >- Standard v3 error shape, returned by validation failures and business-logic errors alike. properties: type: type: string description: >- Machine-readable error type, e.g. VALIDATION_ERROR, ACTION_NOT_ALLOWED, RESOURCE_CONFLICT. example: VALIDATION_ERROR message: type: string description: Human-readable error message. example: One or more fields are invalid or missing. fields: type: array description: >- Present on field-level validation errors. One entry per problem field. items: type: object properties: code: type: string description: Error code related to the field issue. message: type: string description: Error message for the specific issue. field: type: string description: The name of the field that has an issue. Unauthorized: type: object properties: type: type: string description: Unauthorized enum example: UNAUTHORIZED message: type: string description: Unauthorized message example: Authentication required NotFound: type: object properties: type: type: string example: RESOURCE_NOT_FOUND description: The error type, e.g., RESOURCE_NOT_FOUND message: type: string description: A descriptive error message fields: type: array description: List of specific field errors items: type: object properties: code: type: string description: Error code related to the field issue message: type: string description: Error message for the specific issue field: type: string description: The name of the field that has an issue InternalServerError: type: object properties: type: type: string example: INTERNAL_SERVER_ERROR description: Internal server error enum message: type: string example: An internal server error occurred description: Internal server error message SwapSourceObject: type: object description: Resolved source of the swap. properties: userId: type: string description: Public ID of the source user (prefixed with `usr_`). example: usr_3Kf9dQ2mNpXwZ7bV1aLcs walletId: type: string description: Public ID of the source wallet (prefixed with `wlt_`). example: wlt_3Kf9dQ2mNpXwZ7bV1aLcs currency: type: string enum: - USDC - USDT - PYUSD0 - USDG - PYUSD example: USDC chain: type: string enum: - POLYGON - ETHEREUM - SOLANA - BASE - FLOW_EVM - BSC - TRON - CANTON example: POLYGON SwapDestinationObject: type: object description: Resolved destination of the swap. properties: userId: type: string description: Public ID of the destination user (prefixed with `usr_`). example: usr_7bV1aLcs3Kf9dQ2mNpXwZ walletId: type: string description: >- Public ID of the destination wallet (prefixed with `wlt_`). Null when the destination is an external wallet. nullable: true example: wlt_7bV1aLcs3Kf9dQ2mNpXwZ externalWalletId: type: string description: >- Public ID of the destination external wallet (prefixed with `extw_`). Null when the destination is a user wallet. nullable: true example: null currency: type: string enum: - USDC - USDT - PYUSD0 - USDG - PYUSD example: USDT chain: type: string enum: - POLYGON - ETHEREUM - SOLANA - BASE - FLOW_EVM - BSC - TRON - CANTON example: POLYGON SwapReceipt: type: object description: On-chain receipt for the swap. properties: transactionHash: type: string nullable: true description: On-chain transaction hash of the completed swap. Null until settled. example: null SwapQuote: type: object nullable: true description: Commercial quote for the swap. Null until a quote has been generated. properties: sendGross: $ref: '#/components/schemas/SwapAmount' sendNet: $ref: '#/components/schemas/SwapAmount' receiveGross: $ref: '#/components/schemas/SwapAmount' receiveNet: $ref: '#/components/schemas/SwapAmount' rate: type: string description: Conversion rate from source to destination currency. example: '1.0' expiresAt: type: string format: date-time nullable: true example: '2026-07-01T10:35:00.000Z' SwapAmount: type: object description: An amount and its currency. properties: amount: type: string example: '100' currency: type: string enum: - USDC - USDT - PYUSD0 - USDG - PYUSD example: USDC securitySchemes: bearerAuth: type: http scheme: bearer bearerFormat: JWT ````