Flashbots Bundle Relay API Upgrades

[angelfish]

We have a few important upgrades coming to the Flashbots Bundle Relay API!

• new methods with PoS related fields: flashbots_getBundleStatsV2 and flashbots_getUserStatsV2
• bundle cancellations
• switch from HTTP to JSON-RPC standards for success and error responses

New Methods with POS related fields:

1. flashbots_getBundleStatsV2 has two new fields:
   • consideredByBuildersAt contains timestamps indicating when a builder considered the bundle for the target block
   • sealedByBuildersAt contains timestamps indicating when a builder built a full block containing the bundle
2. flashbots_getUserStatsV2 renames miner fields to validator

flashbots_getBundleStats and flashbots_getUserStats will be deprecated on March 31, 2023, please use V2 methods!

Searcher clients will be updated to include V2 stats and cancellations:

• ethers-provider-flashbots-bundle.js: V2 Stats and Cancellations
• web3-flashbots.py: V2 Stats and Cancellations

Documentation:

• V2 Stats
• Cancellations
• API Response

All upgrades have been deployed to:

• Goerli Testnet: https://relay-goerli.flashbots.net
• Sepolia Testnet: https://bundle-relay-sepolia.flashbots.net
• Mainnet Staging: https://relay-staging.flashbots.net

Upgrades will be deployed to Mainnet Production next week.