# Bundled Post-fund

Post-funding only works on certain chains that: 1) do not have a "base fee" and 2) have builders / bundle functionality. Currently we only support this method on BSC.

Instead of paying the fee payer (like in [pre-fund](https://docs.blinklabs.xyz/blink/get-started/blink-gas-sponsorship/types-of-gss/pre-fund "mention")) we simply pay the builder/validator an extra tip to include the sponsoring transaction.

Advantages:

* Simple - "Just works with all types of wallets"
* More gas efficient then [pre-fund](https://docs.blinklabs.xyz/blink/get-started/blink-gas-sponsorship/types-of-gss/pre-fund "mention")

Disadvantages

* Network support (only BSC)