POST
/
payments
/
open
Create OPEN payment.
curl --request POST \
  --url https://sandbox.api.openfx.com/v1/payments/open \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'Idempotency-Key: <idempotency-key>' \
  --header 'X-Signature: <api-key>' \
  --header 'X-Timestamp: <api-key>' \
  --data '
{
  "sourceAccountId": "acc_01953e1a5f4b7002",
  "paymentMethodId": "pm_01953e1a5f4b7300",
  "amount": {
    "currency": "USD",
    "value": "150000"
  },
  "counterpartyId": "cpt_01953e1a5f4b7004",
  "reference": "<string>",
  "metadata": {}
}
'
{
  "id": "pmt_01953e1a5f4b7005",
  "customerId": "cus_01953e1a5f4b7000",
  "sourceAccountId": "acc_01953e1a5f4b7002",
  "counterpartyId": "cpt_01953e1a5f4b7004",
  "paymentMethodId": "pm_01953e1a5f4b7300",
  "status": "completed",
  "direction": "outbound",
  "rail": "ach",
  "sendAmount": {
    "currency": "USD",
    "amount": "1500.00"
  },
  "receiveAmount": {
    "currency": "USD",
    "amount": "1500.00"
  },
  "amountInputSide": "send",
  "executionPreference": "at_market",
  "fees": {
    "feeAmount": {
      "currency": "USD",
      "amount": "2.50"
    },
    "feeCurrency": "USD",
    "feeComponents": [
      {
        "type": "ach_fee",
        "amount": "2.50",
        "currency": "USD"
      }
    ]
  },
  "totalDebitAmount": {
    "currency": "USD",
    "amount": "1502.50"
  },
  "cancellationState": "not_cancelable",
  "reference": "INV-2026-001",
  "metadata": {},
  "createdAt": "2026-02-23T12:00:00Z",
  "updatedAt": "2026-02-23T12:05:00Z",
  "completedAt": "2026-02-23T12:05:00Z"
}

Authorizations

​
Authorization
string
header
required

API key issued at onboarding. Passed as a Bearer token in the Authorization header: Authorization: Bearer <api-key>. Identifies the caller and determines organization scope. Invalid or revoked keys return 401 with error type authentication_error.

​
X-Signature
string
header
required

Ed25519 or RSA-SHA256 asymmetric signature over the request payload (ADR-0015). Provides request integrity and non-repudiation. The signature covers the HTTP method, path, query string, request body, and timestamp. Invalid signatures return 401 with error type authentication_error.

​
X-Timestamp
string
header
required

Unix timestamp (seconds) of when the request was signed. Server rejects requests where the timestamp drifts beyond +/-60 seconds from server time to prevent replay attacks. Must match the timestamp used in the signature computation.

Headers

​
Idempotency-Key
string
required

Idempotency key for this request. UUID v4 recommended. Max 128 characters. 24-hour retention. Same key + same body replays original response with Idempotency-Replayed: true. Same key + different body returns 409 (code: duplicate_idempotency_key). Same key while the original request is still processing returns 409 with a Retry-After header (code: idempotency_key_in_flight).

Maximum string length: 128
Example:

"550e8400-e29b-41d4-a716-446655440000"

Body

application/json

Create an OPEN (internal network) payment. OPEN payments are instant, fee-free, and same-currency only. Specify the recipient via either a pre-created payment method or an inline destination (not both). Inline destinations support OPEN ID (@org.handle.currency) addressing.

​
sourceAccountId
string
required

Account resource identifier.

Pattern: ^acc_[A-Za-z0-9]+$
Example:

"acc_01953e1a5f4b7002"

​
paymentMethodId
string
required

Payment method of type 'open'.

Pattern: ^pm_[A-Za-z0-9]+$
Example:

"pm_01953e1a5f4b7300"

​
amount
object
required

Monetary amount for request input. Value MUST be in smallest currency unit (e.g., cents for USD, pence for GBP). Server derives exponent from currency.

Example:
{ "currency": "USD", "value": "150000" }
​
counterpartyId
string

Counterparty resource identifier.

Pattern: ^cpt_[A-Za-z0-9]+$
Example:

"cpt_01953e1a5f4b7004"

​
reference
string

Payment reference visible to both sender and recipient.

​
metadata
object

Consumer-defined key-value store. Available on all primary resources. Max 50 keys. Keys must match ^[a-zA-Z0-9_]{1,40}$. Values are strings (max 500 chars) or null.

Response

OPEN payment created.

An outbound payment instruction. Created via the unified POST /payments endpoint or rail-specific convenience endpoints. All create the same resource with the same status machine and webhook events.

​
id
string
required

Payment resource identifier.

Pattern: ^pmt_[A-Za-z0-9]+$
Example:

"pmt_01953e1a5f4b7005"

​
customerId
string
required

Customer resource identifier.

Pattern: ^cus_[A-Za-z0-9]+$
Example:

"cus_01953e1a5f4b7000"

​
status
enum<string>
required

External lifecycle status of a payment. Terminal states: completed, returned, reversed, refunded, failed, canceled.

Available options:
created,
requires_action,
in_review,
processing,
completed,
returned,
reversed,
refunded,
failed,
canceled
​
rail
enum<string>
required

Payment rail used for delivery.

Available options:
ach,
fedwire,
swift,
crypto,
open
​
createdAt
string<date-time>
required

UTC timestamp in RFC 3339 / ISO 8601 format.

Example:

"2026-02-23T12:00:00Z"

​
updatedAt
string<date-time>
required

UTC timestamp in RFC 3339 / ISO 8601 format.

Example:

"2026-02-23T12:00:00Z"

​
sourceAccountId
string

Account resource identifier.

Pattern: ^acc_[A-Za-z0-9]+$
Example:

"acc_01953e1a5f4b7002"

​
counterpartyId
string

Counterparty resource identifier.

Pattern: ^cpt_[A-Za-z0-9]+$
Example:

"cpt_01953e1a5f4b7004"

​
paymentMethodId
string

Payment method resource identifier.

Pattern: ^pm_[A-Za-z0-9]+$
Example:

"pm_01953e1a5f4b7300"

​
direction
enum<string>
default:outbound

Payment direction. Always 'outbound' — inbound payments are tracked via the separate InboundPayment resource.

Available options:
outbound
​
sendAmount
object

Monetary amount with exponent-based precision. Value is in smallest currency unit (e.g., cents for USD). displayValue is the human-readable decimal.

Example:
{
  "currency": "USD",
  "exponent": 2,
  "value": "150000",
  "displayValue": "1500.00"
}
​
receiveAmount
object

Monetary amount with exponent-based precision. Value is in smallest currency unit (e.g., cents for USD). displayValue is the human-readable decimal.

Example:
{
  "currency": "USD",
  "exponent": 2,
  "value": "150000",
  "displayValue": "1500.00"
}
​
amountInputSide
enum<string>

Which side of the payment amount is authoritative. 'send' means the sender's debit amount is fixed; 'receive' means the recipient's credit amount is fixed.

Available options:
send,
receive
​
executionPreference
enum<string>

Controls FX execution on cross-currency payments. use_quote requires a pre-locked quoteId. at_market executes at current market rate.

Available options:
use_quote,
at_market
​
quoteId
string | null

FX quote resource identifier.

Pattern: ^qte_[A-Za-z0-9]+$
Example:

"qte_01953e1a5f4b7006"

​
exchangeRate
object

FX rate information embedded in payments and conversions.

​
fees
object

Fee details on payments and estimates. Per ADR-0006.

​
totalDebitAmount
object

Monetary amount with exponent-based precision. Value is in smallest currency unit (e.g., cents for USD). displayValue is the human-readable decimal.

Example:
{
  "currency": "USD",
  "exponent": 2,
  "value": "150000",
  "displayValue": "1500.00"
}
​
cancellationState
enum<string>

Whether the payment can currently be canceled.

Available options:
cancelable,
not_cancelable
​
requiresActionReason
enum<string> | null

Reason why a payment is in requires_action status.

Available options:
cop_required,
beneficiary_verification_required,
rfi_pending,
quote_expired,
return_action_required,
compliance_hold,
travel_rule_required
​
compliance
object

Read-only compliance metadata on payments and counterparties.

​
railDetails
object

Rail-specific details (ACH SEC code, SWIFT charges, etc.).

​
reference
string

Consumer-defined payment reference.

Example:

"INV-2026-001"

​
purpose
enum<string>

Purpose of payment. Required for SWIFT and SEPA payments to certain corridors.

Available options:
goods_and_services,
intercompany_transfer,
investments,
payroll,
treasury_management,
pension,
tax_payment,
trade_of_goods,
financial_services,
donations_and_charity,
rent_and_lease,
reimbursement,
salary_and_compensation,
other
​
metadata
object

Consumer-defined key-value store. Available on all primary resources. Max 50 keys. Keys must match ^[a-zA-Z0-9_]{1,40}$. Values are strings (max 500 chars) or null.

​
completedAt
string<date-time> | null

UTC timestamp in RFC 3339 / ISO 8601 format.

Example:

"2026-02-23T12:00:00Z"

​
achReturnCode
enum<string> | null

ACH return reason code. Present only when rail is ach and the payment has been returned.

Available options:
R01,
R02,
R03,
R04,
R05,
R06,
R07,
R08,
R09,
R10,
R11,
R13,
R14,
R15,
R16,
R17,
R20,
R23,
R29,
R51
​
cryptoNetwork
enum<string> | null

Blockchain network used for crypto payments. Present only when rail is crypto.

Available options:
ethereum,
solana,
base,
ink,
sui
​
cryptoTransferStatus
enum<string> | null

On-chain confirmation status for crypto payments. Present only when rail is crypto.

Available options:
pending_confirmation,
confirmed,
failed
​
travelRule
object

Travel rule data transmitted for this payment. Present only for crypto payments.

​
verificationResult
object

Beneficiary name verification result (CoP/VoP). Present when payment has undergone beneficiary verification.