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POST
/
v1
/
wallets
/
{walletId}
/
sign-transaction
Sign Transaction
curl --request POST \
  --url https://api.beta.getpara.com/v1/wallets/{walletId}/sign-transaction \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "transaction": {
    "to": "0x742d35Cc6634C0532925a3b844Bc9e7595f...",
    "chainId": "1",
    "type": 0,
    "value": "0x2386f26fc10000",
    "data": "<string>",
    "nonce": 1,
    "gasLimit": "0x5208",
    "maxFeePerGas": "<string>",
    "maxPriorityFeePerGas": "<string>",
    "gasPrice": "<string>"
  },
  "networkPassphrase": "Public Global Stellar Network ; September 2015"
}
'
{
  "signedTransaction": "0x02f8..."
}

Authorizations

​
X-API-Key
string
header
default:sk_your_secret_key_here
required

Your partner secret key (server-side only)

Headers

​
X-Request-Id
string<uuid>

UUID for request tracing. Para returns one if omitted.

​
Idempotency-Key
string

Unique key for safe retries on POST endpoints. If a request with the same key is received within 24 hours, the original response is returned without re-executing. Recommended format: UUID v4. Max length 256 characters. Returns 422 if the same key is reused with a different request body. Returns 409 if a request with the same key is still being processed.

Maximum string length: 256

Path Parameters

​
walletId
string
required

Wallet ID

Example:

"0a1b2c3d-4e5f-6789-abcd-ef0123456789"

Body

application/json
​
transaction
required

EVM: JSON object with unsigned transaction fields. Solana: base64-encoded serialized transaction string. Stellar: base64-encoded XDR transaction envelope string. The API differentiates by the wallet's type (determined by walletId). Objects are treated as EVM transactions; strings are treated as Solana or Stellar transactions depending on the wallet type. For Stellar wallets, networkPassphrase is required.

​
networkPassphrase
string

Stellar network passphrase. Required when the wallet referenced by walletId is a STELLAR wallet. Ignored for other wallet types.

Example:

"Public Global Stellar Network ; September 2015"

Response

Signed transaction

​
signedTransaction
string
required

Signed transaction ready for broadcast. EVM: RLP-encoded hex string with 0x prefix. Solana: base64-encoded string. Stellar: base64-encoded XDR string.

Example:

"0x02f8..."