curl --request GET \
  --url https://app.vaultgraph.com/api/signing-keys \
  --header 'x-api-key: <api-key>'

{
  "data": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "key_fingerprint": "<string>",
      "status": "active",
      "public_key": "<string>"
    }
  ]
}