// Request
curl -X GET -H 'Content-Type: application/json' https://cosmos-lcd.blockpi.network/cosmos/<your-api-key>/v1/ibc/core/client/v1/upgraded_client_states
// Result
{
"code": 5,
"message": "rpc error: code = NotFound desc = light client not found: key not found",
"details": []
}