Sign Transactions

📘

This feature is only available for EVM blockchains.

Endpoint

POST /api/v1-alpha1/wallets/<chain>:<address>/transactions/signatures

Required Scope

wallets:transactions.sign

📘

This API is in alpha. Contact us to get the scope added to your API key.

Signing a transaction

❗️

Server Side APIs

All of our APIs should be run from a server and NOT in the browser. Using these APIs in the client exposes your client secret, which WILL result in unauthorized access to your project.

Here's an example curl snippet to show how to send the request:

curl "https://staging.crossmint.com/api/v1-alpha1/wallets/ethereum:0x7e3c09cB46A351Db7834c0E0Bc0CB0cD79A/transactions/signatures" \
  -H "X-PROJECT-ID: your_project_id" \
  -H "X-CLIENT-SECRET: your_client_secret" \
  -H 'Content-Type: application/json' \
  --data '
  {
    "transaction": {
      "nonce": 5,
      "gasPrice": "34329341655",
      "gasLimit": 21000,
      "to": "0x4675c7e5baafbffbca748158becba61ef3b03",
      "value": "0",
      "data": "",
      "from": "0x199d5ed7f45f4ee35960cf22eade205b253f"
    }
  }
'

Transaction parameters explained: