> ## Documentation Index > Fetch the complete documentation index at: https://docs.krypta-pay.com/llms.txt > Use this file to discover all available pages before exploring further. # Convert between wallets > Executes a conversion from your `from` wallet to your `to` wallet at the current rate. Both wallets must exist. Send an `Idempotency-Key`: retrying with the same key returns the original conversion (`200`) instead of converting twice. **API key scope:** `fx:write` ## OpenAPI ````yaml POST /v1/fx/convert openapi: 3.1.0 info: title: KryptaPay API version: 1.0.0 description: >- Collect and pay out across Africa — Mobile Money, bank transfers and stablecoins — through one REST API. Authenticate every request with your secret API key: `Authorization: Bearer kp__…`. All responses use the envelope `{ "ok": boolean, "data"?: …, "error"?: { "code", "message", "details"? } }`. contact: name: KryptaPay Support email: support@krypta-pay.com url: https://krypta-pay.com servers: - url: https://staging.api.krypta-pay.com description: Sandbox - url: https://api.krypta-pay.com description: Production security: - apiKey: [] tags: - name: Payins description: Collect money from your customers' Mobile Money wallets. - name: Payouts description: Send money to Mobile Money wallets, bank accounts and crypto addresses. - name: Fees description: Know the exact fee before you move money. - name: FX description: Exchange rates, quotes and conversions between your wallets. - name: Wallets description: Balances of your multi-currency wallets. - name: Transactions description: Unified history of every movement on your account. - name: Networks description: Which payment networks are currently available. - name: Status description: Public platform status. paths: /v1/fx/convert: post: tags: - FX summary: Convert between wallets description: >- Executes a conversion from your `from` wallet to your `to` wallet at the current rate. Both wallets must exist. Send an `Idempotency-Key`: retrying with the same key returns the original conversion (`200`) instead of converting twice. **API key scope:** `fx:write` operationId: convertFx parameters: - $ref: '#/components/parameters/IdempotencyKey' requestBody: content: application/json: schema: type: object properties: from: $ref: '#/components/schemas/Currency' to: $ref: '#/components/schemas/Currency' amount: type: string pattern: ^\d+(\.\d{1,8})?$ description: >- Decimal amount with up to 8 fractional digits, e.g. "1500" or "1500.75" reference: type: string maxLength: 64 description: >- Your own reference for this conversion. Generated (`tx_…`) when omitted. required: - from - to - amount additionalProperties: false example: from: EUR to: XOF amount: '1000' required: true responses: '200': description: Success content: application/json: schema: type: object properties: ok: type: boolean enum: - true data: type: object properties: id: type: string reference: type: string status: type: string fromCurrency: $ref: '#/components/schemas/Currency' toCurrency: $ref: '#/components/schemas/Currency' fromAmount: type: string pattern: ^\d+(\.\d{1,8})?$ description: >- Decimal amount with up to 8 fractional digits, e.g. "1500" or "1500.75" toAmount: type: string pattern: ^\d+(\.\d{1,8})?$ description: >- Decimal amount with up to 8 fractional digits, e.g. "1500" or "1500.75" midRate: type: string appliedRate: type: string spreadBps: type: number settledAt: type: - string - 'null' required: - id - reference - status - fromCurrency - toCurrency - fromAmount - toAmount - midRate - appliedRate - spreadBps - settledAt additionalProperties: false required: - ok - data additionalProperties: false '201': description: Default Response content: application/json: schema: type: object properties: ok: type: boolean enum: - true data: type: object properties: id: type: string reference: type: string status: type: string fromCurrency: $ref: '#/components/schemas/Currency' toCurrency: $ref: '#/components/schemas/Currency' fromAmount: type: string pattern: ^\d+(\.\d{1,8})?$ description: >- Decimal amount with up to 8 fractional digits, e.g. "1500" or "1500.75" toAmount: type: string pattern: ^\d+(\.\d{1,8})?$ description: >- Decimal amount with up to 8 fractional digits, e.g. "1500" or "1500.75" midRate: type: string appliedRate: type: string spreadBps: type: number settledAt: type: - string - 'null' required: - id - reference - status - fromCurrency - toCurrency - fromAmount - toAmount - midRate - appliedRate - spreadBps - settledAt additionalProperties: false required: - ok - data additionalProperties: false '401': $ref: '#/components/responses/Unauthorized' '403': $ref: '#/components/responses/Forbidden' '422': $ref: '#/components/responses/ValidationError' '429': $ref: '#/components/responses/RateLimited' components: parameters: IdempotencyKey: name: Idempotency-Key in: header required: false description: >- Unique key (a UUID is ideal) for this operation. Retrying with the same key returns the original result instead of creating a duplicate. schema: type: string maxLength: 128 schemas: Currency: type: string enum: - XOF - XAF - NGN - GHS - CDF - EUR - USD - USDC - USDT description: ISO currency code (fiat) or stablecoin ticker. Error: type: object properties: ok: type: boolean enum: - false error: type: object properties: code: type: string description: Stable, machine-readable code. Branch on this, not on `message`. message: type: string description: Human-readable explanation. May change; do not parse. details: description: >- Extra context. For `validation_error`: `{ formErrors, fieldErrors }`. required: - code - message required: - ok - error responses: Unauthorized: description: Missing, invalid or expired API key. content: application/json: schema: $ref: '#/components/schemas/Error' example: ok: false error: code: unauthorized message: Invalid or expired API key Forbidden: description: >- The key lacks the required scope (`insufficient_scope`), or the account is not KYB-approved (`kyb_required`). content: application/json: schema: $ref: '#/components/schemas/Error' example: ok: false error: code: kyb_required message: Your organization must complete KYB verification. ValidationError: description: >- The request failed validation or a business rule. See `error.code` and, for `validation_error`, `error.details.fieldErrors`. content: application/json: schema: $ref: '#/components/schemas/Error' example: ok: false error: code: validation_error message: 'amount: Invalid amount' RateLimited: description: >- Too many requests. Wait for the number of seconds in the `retry-after` header. content: application/json: schema: $ref: '#/components/schemas/Error' example: ok: false error: code: rate_limited message: Rate limit exceeded, retry in 1 minute securitySchemes: apiKey: type: http scheme: bearer description: >- Secret API key from **Dashboard → Developers**: `kp_sandbox_…` for Sandbox, `kp_live_…` for Production. Server-side only. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.