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POST
/
v1
/
query
/
get-withdraw-transaction-passkey
Get withdraw transaction
curl --request POST \
  --url https://api.byzantine.fi/v1/query/get-withdraw-transaction-passkey \
  --header 'Content-Type: application/json' \
  --header 'X-Pubkey: <api-key>' \
  --header 'X-Signature: <x-signature>' \
  --header 'X-Timestamp: <x-timestamp>' \
  --data '{
  "accountId": "550e8400-e29b-41d4-a716-446655440000",
  "vaultAddr": "0x1234567890abcdef",
  "amount": "123.456789",
  "destinationCurrency": "usd",
  "bank_account_id": "550e8400-e29b-41d4-a716-446655440000"
}'
{
  "bodyToSign": {
    "type": "ACTIVITY_TYPE_SIGN_TRANSACTION_V2",
    "timestampMs": "<string>",
    "organizationId": "<string>",
    "parameters": {
      "signWith": "<string>",
      "unsignedTransaction": "<string>",
      "type": "TRANSACTION_TYPE_ETHEREUM"
    }
  },
  "transactionId": "550e8400-e29b-41d4-a716-446655440000"
}

Authorizations

​
X-Pubkey
string
header
required

Integrator's ECDSA public key (P-256 curve, compressed SEC1 format). Example: 0x038fedef7c12f93bbf342ad8943b7a825a3b41f61c9dc118b2c718efebabbf62fd

Headers

​
X-Timestamp
string
required

Unix timestamp in seconds (UTC). Must be within tolerance window (1 minute) to prevent replay attacks. Example: 1760375826

​
X-Signature
string
required

ECDSA signature (DER-encoded, hex with 0x prefix). Signs the message: {timestamp}{METHOD}{path_and_query}{json_body}. Example: 0x3045022100...

Query Parameters

​
chain_id
integer
required

Chain ID (1 for Ethereum, 8453 for Base)

Required range: x >= 0

Body

application/json
​
accountId
string<uuid>
required

A UUID string

Example:

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

​
vaultAddr
string
required

The address of the vault to withdraw from.

Example:

"0x1234567890abcdef"

​
amount
string
required

A high-precision decimal number represented as a string

Example:

"123.456789"

​
destinationCurrency
enum<string>
required
Available options:
usd,
eur,
usdc,
eurc
​
bank_account_id
string<uuid>

A UUID string

Example:

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

Response

Transaction created successfully

​
bodyToSign
object
required

The object that needs to be signed by the end user to make a transaction.

​
transactionId
string<uuid>
required

A UUID string

Example:

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