50,000 blocks and small new feature

builder0x69
1 min readNov 15, 2022

In total we’ve produced more than 50,000 blocks across two permission-less relays — Flashbots and Relayooor
While our biggest upcoming new feature is still under active development we wanted take this milestone to share small incremental improvement which can help wallets / RPC providers with account abstraction.

Going forward you can send bundles to https://builder0x69.io even when they don’t have sufficient balance to cover gas fees. Our builder will cover all necessary gas fees for transactions as long as these fees are returned at the end of the bundle. This can be beneficial, for example, if you just bridged some ERC20 tokens into Ethereum and don’t have native currency to cover gas fees for trades. This feature is already enabled by default for all bundles we receive and as next step we’re also planning to ship necessary changes to our RPC endpoint for MetaMask to make it easier to take advantage of this feature for ordinary users as well.

Also sharing an actual on-chain example where this feature was applied already:
MetaMask swap user didn’t have enough funds to perform a swap at current gas prices and his transaction got stuck in the mempool for ~57 days: https://etherscan.io/tx/0x5b8a9ffebb75c91658a34ee5ffabaab04c09ae02ce95b88918a739d7ce2c9548

Some searcher found an opportunity to back-run this transaction but it wasn’t possible to include original swap since user didn’t have enough funds to cover the base fee. Our builder automatically covered gas fees for user transaction: https://etherscan.io/tx/0x6706837999590465dbf6a5a53cabce26428ab3d2820036670e0c84ac7801fb4f
Which allowed this bundle to succeed: https://etherscan.io/tx/0xfa4f90743521657394c4f585ddc2e6b80532476dcc1189c8cafafb06763274c3

This unlocked user’s wallet to perform further transactions.

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builder0x69

Endpoint for bundles: https://builder0x69.io Private transactions / MM RPC: https://rpc.builder0x69.io Most efficient block builder from ex-mining pool.