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Algorand supports the following signature kinds:
  • Transaction: unsigned transaction.

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Transaction

The following payload can be used with the Sign and Sign and Broadcast endpoints.
FieldDescriptionType - Optional
kindTransactionString
transactionThe unsigned hex encoded transaction as shown below.String
externalIdA unique ID from your system. It can be leveraged to be used as an idempotency key (read more here).String (optional)
{
  "kind": "Transaction",
  "transaction": "0x81a374786e89a3616d74cd2710a3666565cd03e8a26676ce02340f13a367656eac746573746e65742d76312e30a26768c4204863b518a4b3c84ec810f22d4f1081cb0f71f059a7ac20dec62f7f70e5093a22a26c76ce023412fba3726376c4201256a859b39429ee178e0a65056fb33d51c5139044f6a2603c144278010c7684a3736e64c4201256a859b39429ee178e0a65056fb33d51c5139044f6a2603c144278010c7684a474797065a3706179"
}

​
Typescript Example with AlgoSDK

First install the AlgoSDK. You can find the full documentation here: https://github.com/algorand/js-algorand-sdk Here a code sample to broadcast a transaction via the Dfns TypeScript SDK: 
import { Algodv2, encodeObj, makePaymentTxnWithSuggestedParamsFromObject } from 'algosdk'

const walletId = 'wa-6lbfv-9esgj-xxxxxxxxxxxxxxxx'
const wallet = await dfnsClient.wallets.getWallet({ walletId })

const algod = new Algodv2(ALGORAND_TOKEN, ALGORAND_NODE_URL)

const suggestedParams = await algod.getTransactionParams().do()
const transaction = makePaymentTxnWithSuggestedParamsFromObject({
  from: wallet.address,
  suggestedParams,
  to: 'CJLKQWNTSQU64F4OBJSQK35THVI4KE4QIT3KEYB4CRBHQAIMO2CD6JWBCY',
  amount: 10000,
})

const bytes = encodeObj({ txn: transaction.get_obj_for_encoding() })

const res = await dfnsClient.wallets.broadcastTransaction({
  walletId,
  body: {
    kind: 'Transaction',
    transaction: `0x${Buffer.from(bytes).toString('hex')}`,
  },
})
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