eth_uninstallFilter

PancakeSwap swaps and Venus lending keep BEP-20 log volume high on BNB Smart Chain, the BNB-fee network. Every filter you open with eth_newFilter, eth_newBlockFilter, or eth_newPendingTransactionFilter reserves polling state inside the node. eth_uninstallFilter tears that state back down. Hand it the hex filter ID and the node deletes the matching subscription, releasing whatever it was holding. Send the request to https://bsc.therpc.io/YOUR_API_KEY on chain ID 56. The same call handles all three filter types, and it returns a boolean that tells you whether a live filter actually carried that ID.

Use cases

Release the node resources held by a BEP-20 transfer log filter the moment a monitoring session finishes, instead of waiting for the idle timeout.
Iterate over every filter ID your service opened and uninstall them in sequence during graceful application shutdown.

Parameters

#	Name	Type	Required	Description
1	`filterId`	string	Yes	The hex filter ID to remove.

Response

Type	Description
boolean	`true` if the filter was found and removed. `false` if it did not exist (already expired or never created).

Example request

1curl https://bsc.therpc.io/YOUR_API_KEY \
2  -X POST \
3  -H "Content-Type: application/json" \
4  -d '{
5    "jsonrpc": "2.0",
6    "method": "eth_uninstallFilter",
7    "params": ["0x1"],
8    "id": 1
9  }'

Try it live in the BNB Smart Chain playground.

Errors & troubleshooting

Code	Message	Cause
`-32602`	`invalid argument`	The filter ID is not a valid hex string.

Common pitfalls

A false result is not a failure. It means no live filter carried that ID, usually because the filter already lapsed on its own. Treat it as an idempotent confirmation rather than an error.
Idle filters get reaped automatically after roughly five minutes. On a busy BSC node, calling this method explicitly keeps memory pressure down instead of leaning on that timeout.

Supported networks

Mainnet — Chain ID: 56
Testnet — Chain ID: 97