aid: flashbots name: Flashbots description: >- Flashbots is a research and development organization focused on mitigating the negative externalities of Maximal Extractable Value (MEV) on stateful blockchains, starting with Ethereum. Flashbots maintains and operates a set of public infrastructure: the Flashbots Auction JSON-RPC relay for bundle submission, Flashbots Protect RPC for private mempool transactions, the MEV-Share node and protocol for orderflow sharing, MEV-Boost middleware for validators, and SUAVE - an Ethereum-native, MEV-aware, privacy-first encrypted mempool. type: Index image: https://kinlane-productions.s3.amazonaws.com/apis-json/apis-json-logo.jpg url: >- https://raw.githubusercontent.com/api-evangelist/flashbots/refs/heads/main/apis.yml created: '2026-05-23' modified: '2026-05-23' specificationVersion: '0.19' tags: - MEV - Ethereum - Blockchain - JSON-RPC - Relay - MEV-Boost - MEV-Share - Flashbots Protect - SUAVE - Block Builders - Validators apis: - aid: flashbots:auction-relay name: Flashbots Auction Relay (JSON-RPC) description: >- JSON-RPC endpoint for submitting bundles and private transactions to the Flashbots block builder. Supports eth_sendBundle, eth_callBundle, eth_cancelBundle, eth_sendPrivateTransaction, eth_cancelPrivateTransaction, mev_sendBundle, mev_simBundle, and fee refund methods. Requests are authenticated with an X-Flashbots-Signature header (EIP-191). humanURL: https://docs.flashbots.net/flashbots-auction/advanced/rpc-endpoint baseURL: https://relay.flashbots.net tags: - JSON-RPC - Bundles - Private Transactions - Auction - Ethereum properties: - type: Documentation url: https://docs.flashbots.net/flashbots-auction/advanced/rpc-endpoint - type: Authentication url: https://docs.flashbots.net/flashbots-auction/advanced/rpc-endpoint#authentication - type: Repository url: https://github.com/flashbots/rpc-endpoint - aid: flashbots:auction-relay-sepolia name: Flashbots Auction Relay (Sepolia Testnet) description: >- Sepolia testnet instance of the Flashbots Auction JSON-RPC relay for bundle submission and testing without mainnet ETH. humanURL: https://docs.flashbots.net/flashbots-auction/advanced/rpc-endpoint baseURL: https://relay-sepolia.flashbots.net tags: - JSON-RPC - Sepolia - Testnet - Bundles properties: - type: Documentation url: https://docs.flashbots.net/flashbots-auction/advanced/rpc-endpoint - aid: flashbots:protect-rpc name: Flashbots Protect RPC description: >- Public-facing Ethereum JSON-RPC endpoint that routes transactions through Flashbots' private mempool to provide frontrunning protection, potential MEV and gas refunds via MEV-Share, and failed transaction protection. Users add the URL as a custom RPC in their wallet. humanURL: https://docs.flashbots.net/flashbots-protect/overview baseURL: https://rpc.flashbots.net/fast tags: - JSON-RPC - Private Mempool - Frontrunning Protection - MEV Refunds - Wallet properties: - type: Documentation url: https://docs.flashbots.net/flashbots-protect/overview - type: QuickStart url: https://docs.flashbots.net/flashbots-protect/quick-start - type: Repository url: https://github.com/flashbots/rpc-endpoint - aid: flashbots:mev-share-node name: MEV-Share Node API description: >- Public API for the MEV-Share node, an open-source protocol that lets users, wallets, and apps internalize MEV. Users send private transactions to the node, which selectively shares orderflow with searchers according to privacy preferences and returns MEV refunds. humanURL: https://docs.flashbots.net/flashbots-mev-share/introduction baseURL: https://mev-share.flashbots.net tags: - MEV-Share - Orderflow - Searchers - Privacy - Bundles properties: - type: Documentation url: https://docs.flashbots.net/flashbots-mev-share/introduction - type: Repository url: https://github.com/flashbots/mev-share - type: Repository url: https://github.com/flashbots/mev-share-node - aid: flashbots:mev-boost-relay name: MEV-Boost Relay description: >- Public Flashbots-operated relay used by MEV-Boost middleware. Aggregates blocks from many builders and presents the most profitable one to the proposing validator. Used by validators running the open-source MEV-Boost sidecar to access the competitive block-building market. humanURL: https://docs.flashbots.net/flashbots-mev-boost/introduction baseURL: https://boost-relay.flashbots.net tags: - MEV-Boost - Relay - Block Building - Validators - Proposer-Builder Separation properties: - type: Documentation url: https://docs.flashbots.net/flashbots-mev-boost/introduction - type: Dashboard url: https://boost.flashbots.net - type: Repository url: https://github.com/flashbots/mev-boost - type: Repository url: https://github.com/flashbots/mev-boost-relay - aid: flashbots:suave name: SUAVE description: >- Single Unifying Auction for Value Expression - an Ethereum-native, MEV-aware, privacy-first encrypted mempool and decentralized block building network. Provides a testnet, SDKs, and reference clients for building MEV applications. humanURL: https://docs.flashbots.net/flashbots-suave/overview baseURL: https://docs.flashbots.net/flashbots-suave/overview tags: - SUAVE - Encrypted Mempool - Block Building - Testnet - Decentralized properties: - type: Documentation url: https://docs.flashbots.net/flashbots-suave/overview - type: Repository url: https://github.com/flashbots/suave-geth common: - type: Website url: https://www.flashbots.net - type: Portal url: https://docs.flashbots.net - type: Documentation url: https://docs.flashbots.net - type: Blog url: https://writings.flashbots.net - type: GitHub url: https://github.com/flashbots - type: Forum url: https://collective.flashbots.net - type: Community url: https://discord.gg/flashbots - type: Twitter url: https://twitter.com/flashbots - type: Research url: https://www.flashbots.net/research - type: TermsOfService url: https://writings.flashbots.net/legal maintainers: - FN: Kin Lane email: kinlane@gmail.com