curl --request POST \
  --url https://vault-api.stardust.gg/v1/sign/message \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '{
  "walletId": "1",
  "chainType": "EVM",
  "chainId": "1",
  "message": "<string>"
}'

{
  "walletId": "1",
  "chainType": "EVM",
  "chainId": "1",
  "message": "<string>",
  "signature": "<string>"
}