You can use WalletKit to submit raw transactions to the blockchain using simple HTTP APIs. WalletKit will manage your wallet setup, transaction signing, gas estimation, nonce management, and resubmissions. Once the transaction is submitted, you will get notifications for all transaction updates. WalletKit provides higher-level APIs to submit common transactions like minting and transfers for tokens and NFTs. But this guide is focused on submitting raw transactions only.

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Use Cases

You can use WalletKit to submit your transactions from your backend, lambdas, workers, scripts, or webhook handlers. For example, if you want to make an on-chain transaction when an event occurs in your app, you can make a call to WalletKit to do so. Or let’s say you want to airdrop tokens when a user signs up, you can do that as well.

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Setup

Make sure you do the following first:
  1. Setup your WalletKit account
  2. Buy some gas. You can do this from the dashboard. Have 0.01 MATIC available, although we’ll use a lot less.
  3. Get the Project ID and the API Secret from the API Keys page in the dashboard

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Submit Transaction

As an example, let’s say we want to transfer 0.001 MATIC to 0xe883Cd7ADfe55CD84798a8129468e106b32CDC7A. The raw transaction for this is:
JSON
{
  "to": "0xe883Cd7ADfe55CD84798a8129468e106b32CDC7A",
  "value": "0x38D7EA4C68000"
}
To submit a raw transaction, we will use the Sign and Send endpoint:
Shell
curl --request POST \
     --url https://testnet.walletkit.com/transactions/sign-and-send
     --header 'X-WalletKit-Project-ID: <Project ID>' \
     --header 'Authorization: Bearer <API Key>' \
     --data '
{
  "network": "Polygon",
  "signer_wallet_address": "0xbfD206D1Fe1Cc447B9307777E7e5ec54DE2aE05b",
  "unsigned_transaction": {
    "to": "0xe883Cd7ADfe55CD84798a8129468e106b32CDC7A",
    "value": "0x38D7EA4C68000"
  },
  "developer_secret": "testnet-secret"
}
'

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Check Status

That’s it! Your transaction has been submitted. You’ll receive a transaction hash that you can use to check the transaction status. Or, you can subscribe to webhook alerts to get transaction updates.