MEV Blocker

• Name: MEV Blocker
• URL: https://mevblocker.io/
• Category: MEV-protection RPC / private order-flow auction / transaction-execution routing infrastructure
• Tags: ethereum-ecosystem
• Summary: MEV Blocker is a wallet-facing private-orderflow router with rebate logic attached. It keeps transactions out of the public mempool, sells backrun access through a controlled auction path, and kicks part of the take back to users. Useful Ethereum routing middleware, not a new market structure anchor.
• What it does:
  • Offers Ethereum RPC endpoints that route transactions away from the public mempool to reduce exposure to frontrunning and sandwich attacks
  • Runs an order-flow auction in which searchers compete to backrun protected transactions, with docs and homepage materials saying users can receive up to 90% of resulting backrun value as rebates
  • Forwards transactions directly to major builders for fast inclusion, while exposing multiple endpoint options that trade off speed, privacy, revert protection, and rebate maximization
  • Uses a private-mempool design where transaction details can be selectively hidden, signatures removed and re-added, and fake transactions mixed into shared flow to make malicious searcher behavior less reliable
  • Redistributes some builder-fee value back to order-flow originators through gas-rebate mechanics rather than treating the RPC only as a protective filter
• Key claims:
  • The docs introduction defines MEV Blocker as an RPC endpoint that protects transactions from frontrunning and sandwiching while offering rebates from backrunning via an order-flow auction
  • The homepage frames the product as broad-spectrum Ethereum transaction protection for DeFi, NFT minting, and general dapp use, emphasizing that users can add it directly at the wallet RPC layer
  • The order-flow-auction docs make the mechanism explicit: searchers bid to backrun user flow, builders pay to access flow, and the winning searcher is selected based on rebate value to users rather than only validator payment
  • Those same docs show MEV Blocker as more than a private relay: it is a structured routing market with rules around builder bonds/dues, searcher access, fake-transaction obfuscation, and refund distribution
  • The gas-rebates docs position MEV Blocker as a system for recapturing value from Ethereum’s PBS-era fee path, not just blocking harmful MEV but also refunding part of otherwise-lost priority-fee / builder-fee value
  • The homepage explicitly says the project is open to all searchers and builders, and names CoW Protocol, Agnostic Relay, and Beaver Build as original maintainers; newer homepage copy also notes that Special Mechanisms Group acquired the RPC infrastructure in 2026
  • The public web repo reinforces that MEV Blocker is a live integration surface, not only a concept page, with production-facing wallet/RPC setup, docs content, and endpoint-specific UX
• Whitepaper: No canonical standalone whitepaper or litepaper surfaced in this pass. The strongest primary materials were the homepage, official docs, order-flow-auction and gas-rebate pages, public web repo, and acquisition memo; see ../whitepapers/mev-blocker-primary-sources-2026-05-08.md.
• Sources:
  • https://mevblocker.io/
  • https://docs.mevblocker.io/
  • https://docs.mevblocker.io/concepts/how-it-works
  • https://docs.mevblocker.io/concepts/order-flow-auction
  • https://docs.mevblocker.io/concepts/gas-rebates
  • https://github.com/mevblocker/web
  • https://www.smg.org/memo/mevblocker

Internal linkages

• Best upward reads: flashbots-auction and mev-share.
• Keep this note on wallet-edge private routing and rebate policy, not every preconfirmation or encrypted-mempool cousin.

Control surface

• The leverage sits in endpoint choice, builder and searcher admission, what transaction details stay hidden, rebate-split rules, and who operates the private pipeline.

• Useful RPC edge. Still just a routing layer on top of stronger Ethereum block-building markets.

• Last reviewed: 2026-06-11 UTC