> ## Documentation Index > Fetch the complete documentation index at: https://docs.stableyard.fi/llms.txt > Use this file to discover all available pages before exploring further. # Get an account's payment source > Read which connected wallet or Vault funds a UPA's outgoing Payments. Returns the UPA's current source for outgoing Payments, or `null` when no source is configured. The payment source is separate from the settlement preference, which controls where incoming money lands. ## OpenAPI ````yaml openapi.json GET /v2/accounts/{accountId}/payment-source openapi: 3.1.0 info: title: Stableyard Partner API version: 2.0.0-staging x-stableyard-api-version: '2026-09-09' x-stableyard-supported-api-versions: - '2026-09-09' summary: Backend API for UPAs, Payments, activity, and optional financial products. description: > Use this API from a trusted partner backend with an app ID and app secret. ## Recommended integration 1. Call `GET /v2/partners/config` to verify credentials and discover enabled capabilities. 2. Create a UPA only when your product needs a persistent Stableyard account. 3. Create a receive or send Payment with `POST /v2/payments`. 4. Redirect a payer to the returned `paymentUrl` or pass the Payment credentials to an official Stableyard interface SDK. 5. Process signed webhooks and fetch the Payment by ID for reconciliation. Checkout execution and account-bound browser endpoints are intentionally documented in the separate Interfaces & SDKs reference. Console endpoints are dashboard implementation details and are not part of the partner integration contract. x-stableyard-documentation-surface: partner servers: - url: https://prod-api.stableyard.fi description: Production - url: https://staging-api-v2.stableyard.fi description: Staging - url: http://localhost:3001 description: Local security: [] tags: - name: Authentication x-displayName: API authentication description: Verify your app ID and app secret before calling UPA APIs. - name: Accounts x-displayName: UPA Accounts description: Create Universal Payment Accounts and manage account settings. - name: Deposit Addresses description: Create reusable receive addresses and verify inbound deposits. - name: Identity & KYC description: >- Verify the UPA email and run provider-neutral identity verification. Managed vaults and fiat payment rails use this same verified UPA identity. - name: Vaults description: >- Create Safe/Zodiac controlled stablecoin vaults and manage policy updates for accounts. - name: Payments description: >- Create escrow-first payments, issue partner-authenticated send instructions or executions, power public checkout, and reconcile collection through final account settlement. - name: Balances & Transactions description: >- Read Stableyard-posted financial activity. Balances are ledger projections of activity Stableyard processed; they are not live balances of externally controlled wallets. paths: /v2/accounts/{accountId}/payment-source: get: tags: - Accounts summary: Get payment source description: >- Return the UPA's current source for outgoing Payments, or `null` when no source is configured. operationId: getPaymentSourceByAccountId parameters: - name: accountId in: path required: true schema: type: string example: acct_123 description: Canonical account id returned by the Accounts API. - name: Stableyard-Version in: header required: false schema: type: string enum: - '2026-09-09' description: >- Optional contract-version assertion. Omit it to use the app environment's pinned version. A different supported version is accepted only after that environment is explicitly migrated. responses: '200': description: Current payment source headers: Stableyard-Version: description: >- Effective date-based Stableyard API contract version for this response. schema: type: string enum: - '2026-09-09' content: application/json: schema: $ref: '#/components/schemas/PaymentSourceResponse' examples: example: summary: Get payment source 200 response value: paymentSource: id: source_123 accountId: acct_123 version: 1 type: connected_wallet chainId: 42161 tokenAddress: '0xaf88d065e77c8cC2239327C5EDb3A432268e5831' sourceAddress: '0xdFD4ab80E163D6864E26F37540563cBf2E52A582' sourceRef: wallet_123 assetSymbol: USDC status: active '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '403': $ref: '#/components/responses/Forbidden' '404': $ref: '#/components/responses/NotFound' '409': $ref: '#/components/responses/Conflict' '424': $ref: '#/components/responses/FailedDependency' '429': $ref: '#/components/responses/TooManyRequests' security: - partnerBasicAuth: [] components: schemas: PaymentSourceResponse: type: object additionalProperties: false required: - paymentSource properties: paymentSource: anyOf: - $ref: '#/components/schemas/PaymentSourcePreference' - type: 'null' PaymentSourcePreference: type: object additionalProperties: false required: - id - accountId - version - type - chainId - assetSymbol - tokenAddress - status properties: id: type: string example: source_123 accountId: type: string example: acct_123 version: type: integer minimum: 1 example: 1 type: type: string enum: - connected_wallet - vault chainId: type: integer enum: - 42161 - 1 - 8453 - 137 - 56 - 43114 - 4663 - 4217 - 10103 - 10002 description: >- Supported settlement chain IDs: Arbitrum=42161, Ethereum=1, Base=8453, Polygon=137, BNB Smart Chain=56, Avalanche=43114, Robinhood Chain=4663, Tempo=4217, Solana=10103, Movement=10002. Settlement currently supports EVM, Solana, and Movement token destinations. Movement also supports THBT, while Polygon supports direct same-chain JPYC settlement. Tron is deposit-only for settlement-fee escrow. tokenAddress: type: string example: '0xaf88d065e77c8cC2239327C5EDb3A432268e5831' sourceAddress: type: - string - 'null' example: '0xdFD4ab80E163D6864E26F37540563cBf2E52A582' sourceRef: type: - string - 'null' example: wallet_123 assetSymbol: type: string enum: - USDC - USDT - THBT - JPYC - USDG example: USDC status: type: string enum: - active - disabled createdAt: type: string format: date-time updatedAt: type: string format: date-time ErrorResponse: type: object additionalProperties: false required: - error properties: error: type: object additionalProperties: false required: - code - message properties: code: type: string minLength: 1 maxLength: 128 example: bad_request message: type: string minLength: 1 maxLength: 1000 example: The request is invalid details: {} responses: BadRequest: description: Bad request headers: Stableyard-Version: description: >- Effective date-based Stableyard API contract version for this response. schema: type: string enum: - '2026-09-09' content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: example: summary: BadRequest response value: error: code: bad_request message: The request is invalid details: example Unauthorized: description: Unauthorized headers: Stableyard-Version: description: >- Effective date-based Stableyard API contract version for this response. schema: type: string enum: - '2026-09-09' content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: example: summary: Unauthorized response value: error: code: bad_request message: The request is invalid details: example Forbidden: description: The app secret does not include the required scope headers: Stableyard-Version: description: >- Effective date-based Stableyard API contract version for this response. schema: type: string enum: - '2026-09-09' content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: example: summary: Forbidden response value: error: code: bad_request message: The request is invalid details: example NotFound: description: Not found headers: Stableyard-Version: description: >- Effective date-based Stableyard API contract version for this response. schema: type: string enum: - '2026-09-09' content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: example: summary: NotFound response value: error: code: bad_request message: The request is invalid details: example Conflict: description: Conflict headers: Stableyard-Version: description: >- Effective date-based Stableyard API contract version for this response. schema: type: string enum: - '2026-09-09' content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: example: summary: Conflict response value: error: code: bad_request message: The request is invalid details: example FailedDependency: description: Required chain, network, or provider configuration is missing headers: Stableyard-Version: description: >- Effective date-based Stableyard API contract version for this response. schema: type: string enum: - '2026-09-09' content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: example: summary: FailedDependency response value: error: code: bad_request message: The request is invalid details: example TooManyRequests: description: >- Rate limit, payment-option limit, selection cooldown, or temporary abuse block headers: Stableyard-Version: description: >- Effective date-based Stableyard API contract version for this response. schema: type: string enum: - '2026-09-09' Retry-After: description: Seconds until the caller should retry. schema: type: integer minimum: 1 RateLimit-Limit: description: Quota for the most constrained policy. schema: type: integer minimum: 1 RateLimit-Remaining: description: Requests remaining in that policy window. schema: type: integer minimum: 0 RateLimit-Reset: description: Seconds until that policy window resets. schema: type: integer minimum: 0 content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: example: summary: TooManyRequests response value: error: code: bad_request message: The request is invalid details: example securitySchemes: partnerBasicAuth: type: http scheme: basic description: >- HTTP Basic auth. Username is the Stableyard app ID. Password is the app secret. The optional Stableyard-Version request header must match the environment pin. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.