# **Overview**

[**MEV Blocker**](https://mevblocker.io/) is the #1 leading MEV-protection RPC solution by transaction volume and rebates.

**MEV Blocker** is an RPC endpoint built to:
* **Protect** users from frontrunning & sandwich attacks
* **Give** users a rebate from backrunning opportunities created by the user’s trade
* **Provide** fast trade settlement

**MEV Blocker** is built by the experts in MEV supply chain Agnostic Relay, [Beaver Build](https://beaverbuild.org/), [CoW DAO](https://cow.fi/).

# **Market Performance Highlights**

* Since its inception in April 2023, MEV Blocker has protected $64B+ DEX volume, 15.9M+ user transactions, across 862K+ unique wallet addresses, and has captured over backrunning 1700 ETH rebates to users / projects to date .
* MEV Blocker is consistently attracting new users at a rate higher than EVM user growth and is currently processing ~2 to 5% of all daily Ethereum transactions.
* See MEV Blocker full data dashboard [here](https://dune.com/cowprotocol/mev-blocker).

# Why Integrate MEV Blocker?

* **MEV Protection:** MEV Blocker routes transactions through a private mempool to guard against harmful MEV attacks.
* **Quick and reliable:** Over 90% of transactions are processed in the next block, typically within 12 seconds.
* **Earn rebates:** MEV Blocker auctions off the right to backrun users’ transactions, searchers captures backrunning opportunities and sends 90% back as rebates to transaction originators. MEV Blocker automatically captures backrunning opportunities and sends trade rebates to users (with opportunity for projects to capture such rebates).

# How is MEV Blocker Better?
**Low Latency and Fast Inclusion Time**
With a strong builder network, MEV Blocker acts as a builder aggregator where transactions get forwarded directly to network of all the major builders. Over 90% of transactions are processed in the next block, typically within 12 seconds.

**Superior Rebates**
With more robust searchers competition, MEV Blocker has been able to generate at least 5x more backrunning rebates than any other competitor solutions with [over 1000 ETH rebates](https://dune.com/queries/2456432/4038715) to users / projects to date .

**Simple and No $ Cost to Integrate**
MEV Blocker is built by experts to be user-friendly, easy to set up, and no $ cost to integrate.

# **Growing List of Partners**

**Top Wallets** integrated MEV Blocker include [Uniswap Wallet](https://wallet.uniswap.org/), [Rabby Wallet](https://rabby.io/), [Crypto.com Defi Wallet](https://crypto.com/defi-wallet), [Ambire Wallet](https://www.ambire.com/), [Keepkey Wallet](https://www.keepkey.com/).

MEV Blocker is [trusted by more than 30 prominent Ethereum projects ](https://mta-sts.theblock.co/post/225023/ethereum-projects-come-together-on-mev-blocker-rpc-launch-to-share-profits-with-users) including Balancer, Safe, ShapeShift, Paraswap, VirtuSwap, Karpatkey, Swarm, Castle, Aura, Oasis.app, Eigenphi and many more.

# API Docs

**Start sending transactions using the MEV Blocker API:**
Add the following MEV Blocker RPC URL to custom network:
`https://rpc.mevblocker.io/`

**Other End Points:**
MEV Blocker is designed with users in mind, offering multiple end points designed to meet different transaction needs. The endpoints are:

1. `https://rpc.mevblocker.io/fast` - this is the same as the the default endpoint `https://rpc.mevblocker.io/`and focuses on getting transaction included onchain as fast as possible while forwarding you a rebate.

2. `https://rpc.mevblocker.io/noreverts` - focuses on getting transaction included onchain with no reverting. In case your transaction is no longer valid it will stop being broadcasted to builders at no cost for the user.

3. `https://rpc.mevblocker.io/fullprivacy` - focuses on getting transaction included onchain directly via builder. Note this method does not offer a rebate, but guarantees that the information your transaction carries remains fully private in terms of searchers.

**API for Status of Transaction**
MEV Blocker offers an API to keep track of transactions and their attached auctions. To learn about the status of a transaction, you can use the following URL: `https://rpc.mevblocker.io/tx/Your_Tx_Hash`

{"status": 
"hash":  
"rpc_timestamp":
"transaction": 
"from": "",
 "to": "", 
"gasLimit": "", 
"maxFeePerGas": "", 
"nonce": "", 
"value": "", 
"fastMode": 
"shared": 
"simulationError": 
"backruns": 
"referrer":
"refundRecipient":
"refund"

**Set Up Custom Fee Recipient Of Rebates**
When submitting your transaction to the API, use the custom parameter “refundRecipient” to define a different wallet address from the transaction originator address for receiving the rebate:
`https://rpc.mevblocker.io/?refundRecipient=xxx`
*Note: Without this setup, by default, rebates are sent back to users*

**Set Up Data Analytics**
When submitting your transaction to the API, define the custom parameter “referrer=xxx" to associate transactions on MEV Blocker's [transaction origin analytics dashboard](https://dune.com/queries/2638674/5351114) to your project:
`https://rpc.mevblocker.io/?referrer=xxx`

**Set Up Free Cancellation**
Set softCancellations=true in the URL and then send a transaction to self with the same nonce as the one you want to cancel.

*Note: This will stop MEV Blocker from broadcasting your previous transaction (it may still get included in rare conditions if it has been broadcasted before). This can be enabled only on /noreverts or /fullprivacy endpoints, soft cancellations won't work on `/fast`(the default).*

See more on cow.fi docs [page](https://docs.cow.fi/mevblocker).