Withdraw to a bank account

Moves the amount of USDC to hold and queues a payout to an Icelandic bank account in the account holder's own name: a saved one or a new one. Myntkaup pays it out on a business day, in krónur or, to an Arion foreign-currency account, in US dollars; follow it with GET /v1/withdrawals/{id}. Idempotency-Key is required.

Scope: withdrawals:create
Rate-limit class: withdrawal
Authentication: Signed
Idempotency-Key: Required

Parameters

Idempotency-Keystringheaderrequired
1 to 64 characters of [A-Za-z0-9_-]. Kept for 24 h; reuse it to retry safely.
Matches ^[A-Za-z0-9_-]{1,64}$.

Request body

application/json · CreateBankWithdrawalRequest. Unknown fields are rejected.

amountstring (decimal)required
USDC taken from the balance, fee included, with at most 2 decimals. Bank withdrawals are always from USDC; Myntkaup pays out in krónur, or in US dollars to an Arion foreign-currency account.
bank_accountstringrequired
A saved account from GET /v1/bank-accounts, or a new one. It must be in the account holder's own name (kennitala). A foreign-currency account (ledger 38) must be at Arion (03xx-38-…).
Matches ^(\d{4}-\d{2}-\d{6}|\d{12})$. Example: 0133-26-012345.

Responses

201 Created

The withdrawal, pending. application/json · Withdrawal

idstring
Starts with wd_.
typestring (enum)
One of bank, crypto.
statusstring (enum)
awaiting_confirmation: a crypto withdrawal waiting for the link in the confirmation email; expired: that link was not used in time; pending: being processed; completed: sent; canceled; failed.
One of awaiting_confirmation, expired, pending, completed, canceled, failed.
assetstring
An upper-case asset symbol.
Matches ^[A-Z0-9]{1,15}$.
networkstring | null
Crypto only.
amountstring (decimal)
Taken from the balance, fee included.
feestring (decimal)nullable
The withdrawal fee in the asset; null when it isn't known yet.
addressstring | null
Crypto only.
memostring | null
bank_accountstring | null
Bank only.
tx_idstring | null
The blockchain transaction id, once sent.
sourcestring (enum)
Where the record was made: this API, the mobile app or the webapp.
One of public_api, app, web.
created_atstring (date-time)
confirm_bystring (date-time)nullable
For awaiting_confirmation: the confirmation email's link works until this time.
completed_atstring (date-time)nullable

Every response carries MK-Request-Id, plus RateLimit-Policy and RateLimit.

Errors

Errors use the error envelope. Match on code.

Status	Code	Meaning
400	`invalid_request`	The request is malformed: bad JSON, an unknown or invalid field, or a missing header.
401	`invalid_signature`	The MK-* headers are missing or malformed, the key id is unknown, or the signature doesn't match.
401	`key_expired`	The key has passed its expiry date.
401	`key_revoked`	The key was revoked.
401	`timestamp_out_of_range`	MK-Timestamp is more than 30 seconds from the server clock.
401	`nonce_reused`	This key already used this MK-Nonce.
403	`ip_not_allowed`	The request came from an address outside the key's IP allowlist.
403	`insufficient_scope`	The key doesn't have the scope this endpoint needs.
403	`account_restricted`	The account can't use the API right now (for example locked, inactive, or onboarding not finished).
403	`api_access_disabled`	API access is switched off.
403	`forbidden`	This action is switched off for the API right now.
409	`idempotency_conflict`	This Idempotency-Key was used with a different request body.
409	`idempotency_in_progress`	A request with this Idempotency-Key is still being processed.
413	`payload_too_large`	The request body is larger than 8 KB.
415	`unsupported_media_type`	Request bodies must be application/json.
422	`insufficient_funds`	The available balance doesn't cover the trade, gift card or withdrawal.
422	`amount_below_minimum`	The amount is below the minimum.
429	`rate_limited`	Too many requests. Wait for Retry-After seconds.
429	`too_many_concurrent_requests`	Too many requests in flight for this key or account.
429	`key_suspended`	The key is suspended, for example after sustained rate limiting.
500	`internal_error`	Something went wrong on our side.
502	`bad_gateway`	An upstream service answered unexpectedly.
503	`overloaded`	The service is overloaded. Retry after Retry-After seconds.
503	`service_unavailable`	The service is temporarily unavailable.
503	`maintenance`	The API is read-only for maintenance.
504	`gateway_timeout`	An upstream service didn't answer in time. A POST may still complete; retry with the same Idempotency-Key.

# Signed by sign-headers.sh: see Authentication
body='{"amount":"250.00","bank_account":"0133-26-012345"}'
idempotency_key=$(uuidgen)   # reuse it to retry safely
curl https://public-api.myntkaup.is/v1/withdrawals/bank \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $idempotency_key" \
  $(./sign-headers.sh POST /v1/withdrawals/bank "$body" | sed 's/^/-H /') \
  --data "$body"

import { Myntkaup } from "@myntkaup/api";

const client = new Myntkaup(); // reads the key from the environment
// Sends a random Idempotency-Key unless you pass idempotencyKey.
const withdrawal = await client.withdrawals.createBank({
  amount: "250.00",
  bankAccount: "0133-26-012345",
});
console.log(withdrawal.id, withdrawal.status);

from myntkaup import Myntkaup

client = Myntkaup()  # reads the key from the environment
# Sends a random Idempotency-Key unless you pass idempotency_key.
withdrawal = client.withdrawals.create_bank(amount="250.00", bank_account="0133-26-012345")
print(withdrawal["id"], withdrawal["status"])

201 Created

{
  "id": "wd_01JB8X2Q4M7Z3V9K5T1N6R0P2W",
  "type": "bank",
  "status": "pending",
  "asset": "USDC",
  "network": null,
  "amount": "250",
  "fee": "7",
  "address": null,
  "memo": null,
  "bank_account": "0133-26-012345",
  "tx_id": null,
  "source": "public_api",
  "created_at": "2026-11-03T10:15:10Z",
  "confirm_by": null,
  "completed_at": null
}

Base URL https://public-api.myntkaup.is