> ## Documentation Index > Fetch the complete documentation index at: https://docs.spritz.finance/llms.txt > Use this file to discover all available pages before exploring further. # Exchange credentials for JWT token > Exchange HMAC-signed request for a short-lived JWT token. **Authentication**: Requires HMAC signature authentication with integrator credentials. **Use Case**: Backend integrators can exchange their HMAC credentials for a JWT token that can be used from frontend applications. **Token Lifetime**: Maximum 3600 seconds (60 minutes), default 3600 seconds. **Rate Limiting**: 100 token exchanges per minute per integrator. ## OpenAPI ````yaml https://platform.spritz.finance/openapi.json post /v1/integrator/tokens openapi: 3.0.3 info: title: Spritz Finance API version: 1.0.0 description: API for the Spritz Finance platform with RFC 9457 error handling servers: - url: https://platform.spritz.finance description: Production - url: https://sandbox.spritz.finance description: Sandbox security: [] tags: - name: Users description: User management endpoints - name: Bank Accounts description: Manage bank accounts for off-ramp destinations - name: Bills description: Manage bill pay accounts - name: Cards description: Spritz-issued debit cards - name: Auto-Ramp Accounts description: Virtual bank accounts that automatically convert fiat deposits to crypto - name: Spritz App description: >- Endpoints used by the Spritz app and internal SDKs. Excluded from the public partner spec. paths: /v1/integrator/tokens: post: tags: - Integrator summary: Exchange credentials for JWT token description: >- Exchange HMAC-signed request for a short-lived JWT token. **Authentication**: Requires HMAC signature authentication with integrator credentials. **Use Case**: Backend integrators can exchange their HMAC credentials for a JWT token that can be used from frontend applications. **Token Lifetime**: Maximum 3600 seconds (60 minutes), default 3600 seconds. **Rate Limiting**: 100 token exchanges per minute per integrator. operationId: postV1IntegratorTokens requestBody: required: true content: application/json: schema: type: object properties: userApiKey: description: User API key for token exchange minLength: 1 type: string example: ak_N2FjZTk3ZjMtsTWiZF00MGU0LWIxYTMtMTY0ZmM3MzJiNTdm expiresIn: description: 'Token lifetime in seconds (default: 3600, max: 3600)' minimum: 1 maximum: 3600 default: 3600 type: number example: 3600 required: - userApiKey application/x-www-form-urlencoded: schema: type: object properties: userApiKey: description: User API key for token exchange minLength: 1 type: string example: ak_N2FjZTk3ZjMtsTWiZF00MGU0LWIxYTMtMTY0ZmM3MzJiNTdm expiresIn: description: 'Token lifetime in seconds (default: 3600, max: 3600)' minimum: 1 maximum: 3600 default: 3600 type: number example: 3600 required: - userApiKey multipart/form-data: schema: type: object properties: userApiKey: description: User API key for token exchange minLength: 1 type: string example: ak_N2FjZTk3ZjMtsTWiZF00MGU0LWIxYTMtMTY0ZmM3MzJiNTdm expiresIn: description: 'Token lifetime in seconds (default: 3600, max: 3600)' minimum: 1 maximum: 3600 default: 3600 type: number example: 3600 required: - userApiKey responses: '200': description: Response for status 200 content: application/json: schema: type: object properties: accessToken: description: JWT access token with spr_ prefix type: string example: spr_eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9... userId: description: The internal ID of the authorized user type: string example: 6a749a054c3b8fc5da595d1d tokenType: description: Token type (always 'Bearer') type: string enum: - Bearer expiresIn: description: Token lifetime in seconds type: number example: 3600 expiresAt: description: ISO 8601 timestamp when token expires format: date-time type: string example: '2026-08-06T15:28:21.833Z' required: - accessToken - userId - tokenType - expiresIn - expiresAt '401': description: Response for status 401 content: application/json: schema: type: object properties: type: default: about:blank description: A URI reference that identifies the problem type type: string example: urn:problem-type:auth:unauthorized title: description: A short, human-readable summary of the problem type type: string example: Unauthorized status: description: The HTTP status code type: number example: 401 detail: description: A human-readable explanation specific to this occurrence type: string example: Bearer token required instance: description: A URI reference that identifies the specific occurrence type: string realm: description: The authentication realm type: string example: API scope: description: The required scope for this resource type: string example: read:users required: - title - status additionalProperties: false '404': description: Response for status 404 content: application/json: schema: type: object properties: type: default: about:blank description: A URI reference that identifies the problem type type: string title: description: A short, human-readable summary of the problem type type: string status: description: The HTTP status code type: number example: 404 detail: description: A human-readable explanation specific to this occurrence type: string instance: description: A URI reference that identifies the specific occurrence type: string resourceType: description: The type of resource that was not found type: string example: user resourceId: description: The identifier of the resource that was not found type: string required: - title - status - resourceType - resourceId additionalProperties: false '500': description: Response for status 500 content: application/json: schema: type: object properties: type: default: about:blank description: A URI reference that identifies the problem type type: string example: urn:problem-type:auth:unauthorized title: description: A short, human-readable summary of the problem type type: string example: Unauthorized status: description: The HTTP status code type: number example: 400 detail: description: A human-readable explanation specific to this occurrence type: string instance: description: A URI reference that identifies the specific occurrence type: string example: /errors/1234567890 code: description: >- Machine-readable cause, present when exactly one thing failed. Branch on this, never on `detail`, which is human-facing copy and may change. For deposit limits the vocabulary matches the `reason` values the limits API returns pre-flight. type: string example: transaction_limit field: description: The offending request field, present alongside `code`. type: string example: amountUsd retryable: description: >- Whether retrying the same request later may succeed without changing its inputs. type: boolean example: true required: - title - status additionalProperties: false security: - hmacAuth: [] integratorKey: [] timestamp: [] components: securitySchemes: hmacAuth: type: apiKey in: header name: X-Signature description: >- HMAC signature authentication for backend integrators. **Required Headers:** - X-Integrator-Key: Integrator API key (format: int_...) - X-Signature: HMAC signature (format: sha256={hex}) - X-Timestamp: Unix timestamp in milliseconds - Authorization: Bearer {user-api-key} **Signature Algorithm:** HMAC-SHA256 **Signature Format:** {timestamp}.{METHOD}.{path}.{bodyHash} - timestamp: Unix timestamp in milliseconds - METHOD: HTTP method in UPPERCASE (GET, POST, etc.) - path: Request path (e.g., /v1/transactions) - bodyHash: SHA256 hex digest of request body (empty string if no body) **Timestamp Tolerance:** ±5 minutes (300 seconds) **Example:** For POST /v1/transactions with body {"amount":100} and timestamp 1234567890000: Payload: 1234567890000.POST./v1/transactions.{sha256(body)} Signature: sha256=abc123... integratorKey: type: apiKey in: header name: X-Integrator-Key description: 'Integrator API key (format: int_...) used with HMAC authentication' timestamp: type: apiKey in: header name: X-Timestamp description: >- Unix timestamp in milliseconds for replay attack prevention. Must be within 5 minutes of server time. ````