> For the complete documentation index, see [llms.txt](https://docs.chainrpc.io/chainrpc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.chainrpc.io/chainrpc/networks/ethereum/json-rpc-methods/filter-methods.md).

# Filter methods

chainRPC supports the following filter methods over both HTTP and WebSocket. In both cases, the filter IDs can be shared by any connection using the same v3 Project ID.

Filters that are not polled using [`eth_getFilterChanges`](/chainrpc/networks/ethereum/json-rpc-methods/filter-methods/eth_getfilterchanges.md) will be automatically expired after fifteen minutes of inactivity.