> ## Documentation Index > Fetch the complete documentation index at: https://docs.globalstack.io/llms.txt > Use this file to discover all available pages before exploring further. # Execute a transfer > Execute a **crypto transfer**: pay out crypto from one of your wallets to a crypto beneficiary on the wallet's currency and network. This is the crypto outbound equivalent of an offramp. `amount` is a decimal string within the currency network's outbound range. `source_currency` and `destination_currency` are optional; when supplied they must match the wallet and beneficiary currencies respectively, otherwise the request is rejected with `400 invalid_input`. `reference` is your idempotency reference and must be unique within your integration; a reused reference returns `409 duplicate_resource`. The transfer is created in the `processing` state and advances asynchronously (`processing` → `success`/`failed`). Send an `Idempotency-Key` header to make retries safe. USDC amounts settle in whole US cents: `amount` may carry at most **2 significant decimal places**. Trailing zeros are fine — `2.980000` is accepted, `2.980228` is rejected with `400 invalid_amount_precision`. ## OpenAPI ````yaml /api-reference/openapi.json post /v1/transfers openapi: 3.0.0 info: title: GlobalStack API version: 1.0.0 description: > # Introduction GlobalStack API for cross-border payments powered by stablecoin rails. Getting started: authenticate with a Bearer token, make your first call to `GET /v1/currencies`, and explore. **Key operations:** - **Onramp** — convert external fiat into crypto credited to a wallet. - **Offramp** — convert crypto from a wallet into fiat delivered to a beneficiary. - **Conversion** — move value between two wallets belonging to the same customer. - **Transfer** — send crypto from a wallet to an external address. - **Deposit** — receive external crypto into a wallet via a deposit address. See the sections below for authentication, response shape, idempotency, references, metadata, and webhooks. ## Authentication All API requests require a Bearer token in the `Authorization` header: ``` Authorization: Bearer gsa_sk_live_your_api_key ``` API keys use the `gsa_sk_live_` prefix. API keys are scoped to a single merchant account. All resources created with a key belong to that merchant. Keep your keys secret — do not expose them in client-side code or public repositories. To rotate a key, generate a new one from your dashboard and update your integration before revoking the old key. ## API Response Shape Every response — success or failure — follows the same envelope: ```json { "status": true, "message": "Onramp created successfully", "code": "ok", "data": { }, "meta": { "request_id": "req_01ABC...", "timestamp": "2026-04-22T02:00:00Z", "version": "1" } } ``` **Fields:** - `status` (boolean) — whether the HTTP call succeeded. This is not the business status of the underlying resource. - `message` (string) — human-readable explanation for developers and logs. Do not show to end users. - `code` (string) — stable machine-readable result. `ok` on success, or an error code like `bad_request`. - `data` — the resource payload on success (object, array, or scalar). `null` on failure. - `meta` — request-scoped metadata, always present. Includes `request_id` (quote this in support tickets), `timestamp`, and `version`. On list endpoints, also includes `page`, `per_page`, `total`, `has_more`. On validation errors, includes `errors` array and `next_steps`. Error responses include `next_steps` in `meta` with an `action` string and a `docs_url` link: ```json { "status": false, "message": "Your request has validation errors.", "code": "bad_request", "data": null, "meta": { "request_id": "req_01ABC...", "timestamp": "2026-04-22T02:00:00Z", "version": "1", "errors": [ { "field": "amount", "code": "required", "message": "Amount is required." } ], "next_steps": { "action": "Review the request and retry with corrected parameters.", "docs_url": "https://docs.globalstack.io/errors#bad_request" } } } ``` ## Idempotency Pass an `Idempotency-Key` header on any create endpoint to make the request safely retryable: ``` Idempotency-Key: your-unique-key-here ``` **Rules:** - Same key + same body = returns the original response (no side effects). - Same key + different body = returns `idempotency_conflict` (409). - Keys are scoped to your merchant account. - Keys expire after 24 hours. Use idempotency keys for any operation that creates a resource or moves money. This protects against network retries, duplicate webhooks, and client-side retry loops. ## Rate Limits Requests over the rate limit are rejected with HTTP `429` and the error code `rate_limited`: ```json { "status": false, "message": "Too many requests. Slow down and retry shortly.", "code": "rate_limited" } ``` **Money-movement writes** (creating transfers, offramps, conversions, or wallet operations) are limited **per merchant account** — the budget is shared across all of your API keys and dashboard sessions. Reads are not limited. On a `429`, back off and retry with jitter; for money movement, reuse the same `Idempotency-Key` so the retry stays safe. ## Reference Every money movement operation (onramp, offramp, conversion, transfer) accepts an optional `reference` field — a merchant-supplied identifier that is unique per merchant account. ```json { "reference": "INV-2026-001", "wallet_id": "wal_..." } ``` If you omit `reference`, the API generates one automatically (prefixed `ref_`). References are unique per merchant — attempting to create two operations with the same reference returns the existing operation (same behavior as idempotency, but permanent and not time-limited). Use `reference` to correlate GlobalStack operations with your own system records (invoices, orders, payouts). ## Metadata Most create endpoints accept an optional `metadata` object — a flat set of string key/value pairs stored on the resource: ```json { "metadata": { "order_id": "ord_12345", "customer_email": "alice@example.com" } } ``` Metadata is returned on every GET response and in webhook payloads. It is not used by GlobalStack for processing — it exists for your own record-keeping. Resources that accept metadata: customers, wallets, senders, beneficiaries, wallet credentials, deposit addresses, onramps, offramps, conversions, and transfers. ## Webhook Signatures Every webhook delivery is signed so you can verify it came from GlobalStack and was not tampered with in transit. Signatures follow the [Svix](https://docs.svix.com/receiving/verifying-payloads/how) standard, so you can verify them with any Svix library — or manually with the construction below. Each delivery carries three headers: ``` svix-id: msg_2gT8sV... # unique message id (the body's event_id, prefixed msg_) svix-timestamp: 1718960400 # unix seconds when the delivery was signed svix-signature: v1,g0hM9SsE... # space-separated list of v1, ``` Your signing secret (prefixed `whsec_`) is returned in plaintext **exactly once** — when you create a webhook endpoint or rotate its secret. Store it securely; you cannot retrieve it again. **Verify with a Svix library (recommended):** ```python from svix.webhooks import Webhook wh = Webhook(signing_secret) # the whsec_... value payload = wh.verify(raw_request_body, request_headers) # raises on a bad signature ``` **Verify manually:** 1. Build the signed content by joining the id, timestamp, and the **raw** request body with dots: ``` signed_content = svix_id + "." + svix_timestamp + "." + raw_body ``` 2. Take your signing secret, drop the `whsec_` prefix, and base64-decode the remainder — those bytes are your HMAC key. 3. Compute `base64(HMAC-SHA256(key, signed_content))`. 4. The `svix-signature` header is a space-separated list of `v1,` entries (an endpoint can have more than one valid secret during a rotation). Compare your computed value against each entry's signature — the part after `v1,` — using a constant-time comparison, and accept if any matches. 5. Reject deliveries whose `svix-timestamp` differs from your current time by more than a few minutes, to guard against replay. The body's `event_id` equals the `svix-id` without its `msg_` prefix, so you can use either to deduplicate redelivered events. ## Request IDs Every response carries an `X-Request-Id` header (also surfaced in `meta.request_id`). Include the value when reporting issues — it scopes backend logs to your specific request. You may also send your own `X-Request-Id` header. Values matching `^[A-Za-z0-9_-]{1,128}$` are honored verbatim; anything else is replaced with a generated id. ## Versioning Public endpoints are versioned under `/v1/`. Breaking changes ship under a new major version; additive changes (new fields, new endpoints) ship under the existing version. contact: name: Paystack Cross-Border url: https://globalstack.io servers: - url: https://api.globalstack.io description: Production security: - BearerAuth: [] tags: - name: Supported Countries - name: Supported Currencies - name: Customers - name: Wallets - name: Beneficiaries - name: Quotes - name: Onramps - name: Offramps - name: Conversions - name: Transfers - name: Transactions - name: Notification Webhooks - name: Me paths: /v1/transfers: post: tags: - Transfers summary: Execute a transfer description: > Execute a **crypto transfer**: pay out crypto from one of your wallets to a crypto beneficiary on the wallet's currency and network. This is the crypto outbound equivalent of an offramp. `amount` is a decimal string within the currency network's outbound range. `source_currency` and `destination_currency` are optional; when supplied they must match the wallet and beneficiary currencies respectively, otherwise the request is rejected with `400 invalid_input`. `reference` is your idempotency reference and must be unique within your integration; a reused reference returns `409 duplicate_resource`. The transfer is created in the `processing` state and advances asynchronously (`processing` → `success`/`failed`). Send an `Idempotency-Key` header to make retries safe. USDC amounts settle in whole US cents: `amount` may carry at most **2 significant decimal places**. Trailing zeros are fine — `2.980000` is accepted, `2.980228` is rejected with `400 invalid_amount_precision`. operationId: TransferController.executeTransfer parameters: - in: header name: Idempotency-Key required: false schema: type: string pattern: ^[A-Za-z0-9_\-]{8,255}$ description: >- Optional client-supplied key. Identical key + identical body within 24h replays the original response. Identical key + different body returns 409 idempotency_conflict. The hash is over raw bytes — clients retrying must send the byte-identical body; a re-serialised JSON payload will produce a different hash and a 409. Strongly recommended for retry-safe clients. requestBody: content: application/json: schema: $ref: '#/components/schemas/ExecuteTransferDto' description: ExecuteTransferDto required: false responses: '200': content: application/json: schema: allOf: - $ref: '#/components/schemas/ApiSuccessEnvelope' - type: object required: - data - meta properties: message: type: string example: Transfer executed successfully data: $ref: '#/components/schemas/TransferResponse' meta: $ref: '#/components/schemas/ApiResponseMetaSchema' description: Transfer executed successfully '400': description: >- Request body failed validation, the wallet_id/beneficiary_id is not a valid wal_…/ben_… id, the beneficiary is not crypto, the wallet and beneficiary currencies differ, a supplied source_currency/destination_currency does not match, the currency is not crypto / not transfer-enabled, the network is not supported, the amount is outside the network range or has more decimal places than the currency settles (`invalid_amount_precision` — USDC supports at most 2, trailing zeros allowed), or the Idempotency-Key header is malformed content: application/json: schema: allOf: - $ref: '#/components/schemas/ApiErrorEnvelope' - type: object properties: code: type: string enum: - invalid_input - invalid_amount_precision '401': description: Unauthorized — invalid or missing API key content: application/json: schema: allOf: - $ref: '#/components/schemas/ApiErrorEnvelope' - type: object properties: code: type: string enum: - authentication_failed '404': description: >- Wallet or beneficiary not found, or it belongs to a different integration content: application/json: schema: allOf: - $ref: '#/components/schemas/ApiErrorEnvelope' - type: object properties: code: type: string enum: - not_found '409': description: >- Conflict — possible codes: `duplicate_resource` (the `reference` is already used by another transfer for this integration), `idempotency_conflict` (Idempotency-Key reused with a different request body), `idempotency_in_progress` (a request with the same Idempotency-Key is still in flight). Branch on the `code` field of the response envelope. content: application/json: schema: allOf: - $ref: '#/components/schemas/ApiErrorEnvelope' - type: object properties: code: type: string enum: - duplicate_resource - idempotency_conflict - idempotency_in_progress '422': description: >- The wallet balance does not have enough available funds for the transfer amount content: application/json: schema: allOf: - $ref: '#/components/schemas/ApiErrorEnvelope' - type: object properties: code: type: string enum: - ledger_insufficient_funds '500': description: >- FX Engine upstream is unreachable (`external_service_unavailable`), or the wallet is not fully provisioned / the service is misconfigured (`configuration_error`). Branch on the `code` field of the response envelope. content: application/json: schema: allOf: - $ref: '#/components/schemas/ApiErrorEnvelope' - type: object properties: code: type: string enum: - external_service_unavailable - configuration_error components: schemas: ExecuteTransferDto: properties: wallet_id: maxLength: 64 type: string beneficiary_id: maxLength: 64 type: string amount: pattern: ^\d+(\.\d+)?$ type: string reference: maxLength: 128 type: string source_currency: pattern: ^[A-Z0-9]{2,8}$ type: string destination_currency: pattern: ^[A-Z0-9]{2,8}$ type: string retry_on_failure: type: boolean metadata: type: object type: object required: - wallet_id - beneficiary_id - amount - reference ApiSuccessEnvelope: properties: status: type: boolean enum: - true example: true message: type: string description: Human-readable summary example: Resource fetched successfully code: type: string enum: - ok example: ok type: object required: - status - message - code TransferResponse: properties: id: type: string description: Transfer external id (prefixed tfr_). example: tfr_01EXAMPLE reference: type: string example: INV-2026-001 status: type: string enum: - processing - temporary_failure - success - failed example: processing retry_on_failure: type: boolean description: Whether the payout retries on a temporary failure. example: true customer: $ref: '#/components/schemas/TransferCustomerResponse' wallet: $ref: '#/components/schemas/TransferWalletResponse' beneficiary: $ref: '#/components/schemas/BeneficiaryResponse' amount: type: string description: Transfer amount, formatted to the currency precision. example: '5.000000' currency: type: string example: USDC network: type: string description: Crypto network of the beneficiary. example: base transaction_hash: type: string nullable: true example: null failure_reason: type: string nullable: true description: >- Stable machine-readable failure code; null unless the transfer failed. example: null failure_reason_message: type: string nullable: true description: Human-readable failure explanation; null unless the transfer failed. example: null metadata: type: object description: Merchant-supplied opaque metadata. additionalProperties: type: string example: payout_batch: batch_001 created_at: type: string format: date-time example: '2026-04-22T02:00:00.000Z' updated_at: type: string format: date-time example: '2026-04-22T02:00:00.000Z' type: object required: - id - reference - status - retry_on_failure - customer - wallet - beneficiary - amount - currency - network - metadata - created_at - updated_at ApiResponseMetaSchema: properties: request_id: type: string description: ULID-prefixed identifier for this request example: req_01HXYZ4K5ABCDEFGHJKLMNPQRS timestamp: type: string format: date-time example: '2026-05-14T15:43:55.732Z' version: type: string description: Major API version parsed from /vN/ example: '1' type: object required: - request_id - timestamp - version ApiErrorEnvelope: properties: status: type: boolean enum: - false example: false message: type: string description: Human-readable failure summary example: Resource not found code: type: string description: Stable error code for branching logic example: not_found data: type: object nullable: true example: null meta: $ref: '#/components/schemas/ApiErrorMetaSchema' type: object required: - status - message - code - data - meta TransferCustomerResponse: properties: id: type: string example: cust_seed_alice type: type: string enum: - individual - business example: individual name: type: string example: Alice Johnson email: type: string format: email example: alice.seed@globalstack.mock tier: type: string enum: - tier_0 - tier_1 - tier_2 example: tier_2 created_at: type: string format: date-time example: '2026-04-16T16:14:08.000Z' updated_at: type: string format: date-time example: '2026-04-16T16:14:08.000Z' type: object required: - id - type - name - email - tier - created_at - updated_at TransferWalletResponse: properties: id: type: string description: Source wallet external id (prefixed wal_). example: wal_seed_alice_usdc currency: type: string example: USDC label: type: string nullable: true example: USDC Wallet type: object required: - id - currency BeneficiaryResponse: properties: id: type: string description: GlobalStack beneficiary external id (prefixed ben_). example: ben_01KPBAP7WTDKQKW5B3R31VPNX4 customer_id: type: string description: External id of the customer this beneficiary belongs to. example: cust_01HXYZABC1234567890ABCDEFG name: type: string description: Display name example: Alice Bank Beneficiary label: type: string nullable: true example: Alice's salary account type: enum: - fiat - crypto type: string example: fiat currency: type: string description: Uppercase currency code example: NGN merchant_reference: type: string nullable: true description: >- Caller-supplied or auto-generated identifier (ref_…) unique per integration. example: ref_01HXYZ4K5ABCDEFGHJKLMNPQRS details: type: object description: >- Type-specific payout details. Fiat: country+network+account+provider. Crypto: chain+address. oneOf: - $ref: '#/components/schemas/BeneficiaryFiatDetailsResponse' - $ref: '#/components/schemas/BeneficiaryCryptoDetailsResponse' metadata: type: object description: Merchant-supplied opaque metadata. Values are stored as strings. example: {} additionalProperties: type: string status: enum: - pending - active - archived type: string example: pending created_at: type: string format: date-time example: '2026-04-16T16:14:08.000Z' updated_at: type: string format: date-time example: '2026-04-16T16:14:08.000Z' type: object required: - id - customer_id - name - type - currency - details - metadata - status - created_at - updated_at ApiErrorMetaSchema: properties: next_steps: $ref: '#/components/schemas/NextStepsSchema' request_id: type: string description: ULID-prefixed identifier for this request example: req_01HXYZ4K5ABCDEFGHJKLMNPQRS timestamp: type: string format: date-time example: '2026-05-14T15:43:55.732Z' version: type: string description: Major API version parsed from /vN/ example: '1' type: object required: - next_steps - request_id - timestamp - version BeneficiaryFiatDetailsResponse: properties: country_code: type: string description: ISO 3166-1 alpha-2 country example: NG network: type: string enum: - bank - mobile_money example: bank account_number: type: string example: '0039415616' account_name: type: string nullable: true example: ALICE JOHNSON provider: $ref: '#/components/schemas/BeneficiaryFiatProviderResponse' type: object required: - country_code - network - account_number - provider BeneficiaryCryptoDetailsResponse: properties: network: enum: - solana - base - ethereum type: string example: solana address: type: string example: 9wFFa... type: object required: - network - address NextStepsSchema: properties: action: type: string description: Suggested action for the caller example: Verify the resource identifier and retry. docs_url: type: string format: uri example: https://docs.globalstack.io/errors#not_found type: object required: - action - docs_url BeneficiaryFiatProviderResponse: properties: id: type: string description: GlobalStack provider id example: prov_01KPBAP7WTDKQKW5B3R31VPNX4 name: type: string example: Access Bank code: type: string description: Upstream provider code (may be null in source). example: '000014' type: object required: - id - name - code securitySchemes: BearerAuth: type: http scheme: bearer description: API key issued during merchant onboarding. ````