> ## Documentation Index > Fetch the complete documentation index at: https://docs.aropay.aro.media/llms.txt > Use this file to discover all available pages before exploring further. # Fund wallet > Faucet: the platform operator sends test stablecoin to the wallet and tops up Sepolia ETH for gas in the same call. `amount` is optional; omit it for the deployment default. Faucet volume is capped per account over a rolling 24 hours. Blocks up to ~90 s for the receipt; may return the transaction still `PENDING`; poll `GET /transactions/{id}` until terminal. ## OpenAPI ````yaml /api-reference/openapi.yaml post /fund openapi: 3.1.0 info: title: AroPay API version: 1.0.0 description: | The AroPay API for orchestrating sealed, private payments on public ledgers, built on the Aro Confidential Rails (Zama Protocol FHE). The current deployment is an MVP sandbox for B2B users on Ethereum Sepolia, with Mainnet to follow. Every response (except the flat Sandbox probes) uses the shared envelope: `{ "ok": true, "data": … }` on success and `{ "ok": false, "error": { "code", "message", "details?" } }` on failure. Amounts are decimal strings in human units (e.g. `"125.50"`). Write requests must send `Content-Type: application/json`. contact: name: Aro Media url: https://aro.media servers: - url: https://aropay.aro.media/api/v1 description: Sandbox - url: http://aropay.localhost:3000/api/v1 description: Local development security: - apiKeyAuth: [] - sessionCookie: [] tags: - name: Auth description: Password, TOTP, and passkey login; session inspection and logout. - name: Profile & security description: Profile, password, two-factor authentication, and passkey management. x-group: Profile & security - name: API keys description: Programmatic credentials. Creation and revocation are session-only. - name: Wallets description: Custodial and external (watch-only) wallets. - name: Balances description: Balance triples and lightweight gas reads. - name: Money movement description: Faucet funding, minting, transfers, and redemptions. - name: Transactions description: History, single-transaction reads, and notarized receipts. - name: Sandbox description: Unauthenticated status and echo probes with a flat response shape. paths: /fund: post: tags: - Money movement summary: Fund wallet description: | Faucet: the platform operator sends test stablecoin to the wallet and tops up Sepolia ETH for gas in the same call. `amount` is optional; omit it for the deployment default. Faucet volume is capped per account over a rolling 24 hours. Blocks up to ~90 s for the receipt; may return the transaction still `PENDING`; poll `GET /transactions/{id}` until terminal. operationId: fundWallet requestBody: required: true content: application/json: schema: type: object required: - walletId properties: walletId: type: string amount: type: string description: Optional decimal string in human units, e.g. "250". example: walletId: ckwlt0001abcd responses: '201': description: Funding transaction. content: application/json: schema: $ref: '#/components/schemas/TransactionEnvelope' example: ok: true data: transaction: id: cktxn0001abcd type: FUND status: CONFIRMED chainId: 11155111 amount: '1000.00' token: AROUSD txHash: 0x3d9e… settlementTxHash: 0x77aa… explorerUrl: https://sepolia.etherscan.io/tx/0x3d9e… fromAddress: null toAddress: '0x8Ba1f109551bD432803012645Ac136ddd64DBA72' counterparty: null walletId: ckwlt0001abcd error: null metadata: null createdAt: '2026-08-13T09:35:00.000Z' updatedAt: '2026-08-13T09:35:41.000Z' '400': description: Validation failure, unknown wallet, or faucet cap reached. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '401': $ref: '#/components/responses/Unauthorized' '403': $ref: '#/components/responses/AccountDisabled' '404': $ref: '#/components/responses/NotFound' '429': $ref: '#/components/responses/RateLimited' '500': $ref: '#/components/responses/InternalError' '502': description: Operator could not fund the wallet (liquidity or gas). content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: ok: false error: code: faucet_failed message: The faucet could not complete the transfer. components: schemas: TransactionEnvelope: type: object required: - ok - data properties: ok: const: true data: type: object required: - transaction properties: transaction: $ref: '#/components/schemas/Transaction' ErrorResponse: type: object description: The shared failure envelope. required: - ok - error properties: ok: const: false error: type: object required: - code - message properties: code: type: string description: Machine-readable error code; match on this, not `message`. message: type: string details: description: Structured context, e.g. per-field validation issues. Transaction: type: object description: A sandbox operation and its on-chain outcome. required: - id - type - status - chainId - amount - token - txHash - settlementTxHash - explorerUrl - fromAddress - toAddress - counterparty - walletId - error - metadata - createdAt - updatedAt properties: id: type: string examples: - cktxn0001abcd type: type: string enum: - FUND - MINT - TRANSFER - PRIVATE_TRANSFER - REDEEM status: type: string enum: - PENDING - CONFIRMED - SETTLING - SETTLED - FAILED description: | `PENDING` → `CONFIRMED`/`FAILED` for most types; redeems go `PENDING` → `SETTLING` → `SETTLED`. Terminal states: `CONFIRMED`, `SETTLED`, `FAILED`. chainId: type: integer examples: - 11155111 amount: type: string description: Decimal string in human units. token: type: string description: Token symbol the amount denominates. txHash: type: - string - 'null' description: First-leg transaction hash. settlementTxHash: type: - string - 'null' description: Second-leg hash; redeem payout or the faucet's stablecoin leg. explorerUrl: type: - string - 'null' description: Block-explorer link for `txHash`. fromAddress: type: - string - 'null' toAddress: type: - string - 'null' counterparty: type: - string - 'null' walletId: type: - string - 'null' error: type: - string - 'null' description: Failure context when `status` is `FAILED`. metadata: description: Operation-specific context (object or null). createdAt: type: string format: date-time updatedAt: type: string format: date-time responses: Unauthorized: description: Missing or invalid credential. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: ok: false error: code: invalid_api_key message: Invalid API key. AccountDisabled: description: The account has been deactivated. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: ok: false error: code: account_disabled message: This account is disabled. NotFound: description: Resource not found within this account. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: ok: false error: code: not_found message: Resource not found. RateLimited: description: Rate limit exceeded. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: ok: false error: code: rate_limited message: Too many requests. Try again shortly. InternalError: description: Unexpected server error. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: ok: false error: code: internal_error message: An unexpected error occurred. securitySchemes: apiKeyAuth: type: http scheme: bearer bearerFormat: aro_sk_… description: | AroPay API key, sent as `Authorization: Bearer aro_sk_…`. Created in the dashboard under Settings → API keys. Takes precedence over a session cookie when both are present. x-default: aro_sk_your_key_here sessionCookie: type: apiKey in: cookie name: aropay_session description: | Browser session cookie minted by `POST /auth/login` (or passkey login). httpOnly, `SameSite=Lax`, 24 h TTL. Endpoints marked **Session-only** accept only this credential and return `403 session_required` for API keys. ````