Subscriptions are cancelled with a regular RPC call with eth_unsubscribe as method and the subscription id as first parameter.
Parameters
Subscription ID, as previously returned from an eth_subscribe call.
Returns
True if a subscription was successfully cancelled, or false if no subscription existed with the given ID.
Example
Request
wscat -c wss://eth-mainnet.unifra.io/v1/<key>
{"jsonrpc":"2.0", "id": 1, "method": "eth_unsubscribe", "params": ["0x9cef478923ff08bf67fde6c64013158d"]}
Result
{
"jsonrpc": "2.0",
"id": 1,
"result": true
}