> For the complete documentation index, see [llms.txt](https://fastlane-labs.gitbook.io/polygon-fastlane/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://fastlane-labs.gitbook.io/polygon-fastlane/searcher-guides/4337-bundles-integration-guide/overview.md).

# Overview

The recently introduced API method `bor_sendRawTransactionConditional` by the Polygon client Bor is only functional if the caller has a direct connection to a validator node RPC. For obvious security reasons, validators cannot open their RPCs to the world, and the new method becomes unusable.

PFL proposes a very similar API method through its relay, `pfl_sendRawTransactionConditional`, for any and every AA bundler to be able to access and take advantage of the conditional bundle feature.