How safe is web crypto API? code example

Example: crypto.com api

{
    "id": 11,
    "method": "private/get-account-summary",
    "params": {
        "currency": "MCO"
    },
    "nonce": 1587523073344
}

// OR (for all currencies, omit currency, but ensure params still exists as {})

{
    "id": 11,
    "method": "private/get-account-summary",
    "params": {},
    "nonce": 1587523073344
}