# A list of Order Flow Auction (OFA) Protocols

**URL:** https://collective.flashbots.net/t/a-list-of-order-flow-auction-ofa-protocols/2573
**Category:** Searchers
**Tags:** order-flow, links
**Created:** [October 23, 2023, 7:26am UTC](https://collective.flashbots.net/t/a-list-of-order-flow-auction-ofa-protocols/2573 "2023-10-23T07:26:58Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![Eru\_Iluvatar](https://collective.flashbots.net/user_avatar/collective.flashbots.net/eru_iluvatar/32/310_2.png) [@Eru\_Iluvatar](https://collective.flashbots.net/u/Eru_Iluvatar)
#### Post date: [October 23, 2023, 7:26am UTC](https://collective.flashbots.net/t/a-list-of-order-flow-auction-ofa-protocols/2573/1 "2023-10-23T07:26:58Z")

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Order Flow Auction protocols (or OFAs) are protocols that auction the flow of a Flow Provider (also called Transaction Originator) to a set of permissioned/permissionless searchers, bidding to extract non-toxicv MEV from the transaction. This often translates in backrunning of a swap transaction.  
OFAs allow Flow Providers to protect their users from toxic MEV while earning more revenues from their users (and whether they redistribute it or not is another question), this can be done in different ways (learn more about the two main models of transaction auction here).

This post aims at recensing the current OFA protocols.

OFA via a private RPC:

- Merkle - [https://www.merkle.io/](https://www.merkle.io/)
- Blink Labs - [https://blinklabs.xyz/](https://blinklabs.xyz/)
- Kolibrio - [https://www.kolibr.io/](https://www.kolibr.io/)
- MEV Share - [GitHub - flashbots/mev-share: Protocol for orderflow auctions](https://github.com/flashbots/mev-share)
- Propeller Heads - [https://www.propellerheads.xyz/](https://www.propellerheads.xyz/)
- MEVBlocker - [https://mevblocker.io/](https://mevblocker.io/)

Intent-based OFA APIs:

- Propeller Heads - [https://www.propellerheads.xyz/](https://www.propellerheads.xyz/)
- Wall Chain - [https://www.wallchain.xyz/](https://www.wallchain.xyz/)
- DFlow - [https://dflow.net/](https://dflow.net/)

DEX with integrated OFA:

- CowSwap - [https://cow.fi/](https://cow.fi/)
- 1inch Fusion - [1inch Fusion - a new DEX standard. built on top of 1inch’s Aggregation and Limit Order protocols.](https://1inch.io/fusion/)
- Uniswap X - [https://uniswap.org/](https://uniswap.org/)

I may have forgotten some protocols, please feel free to let me know.

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### Author: ![Fred](https://collective.flashbots.net/user_avatar/collective.flashbots.net/fred/32/1288_2.png) [@Fred](https://collective.flashbots.net/u/Fred)
#### Post date: [October 24, 2023, 12:45pm UTC](https://collective.flashbots.net/t/a-list-of-order-flow-auction-ofa-protocols/2573/2 "2023-10-24T12:45:25Z")

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Great initiative!  
A couple that’s currently missing from the list above:

MEVBlocker: [https://mevblocker.io/](https://mevblocker.io/)  
DFlow: [https://dflow.net/](https://dflow.net/)

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### Author: ![Eru\_Iluvatar](https://collective.flashbots.net/user_avatar/collective.flashbots.net/eru_iluvatar/32/310_2.png) [@Eru\_Iluvatar](https://collective.flashbots.net/u/Eru_Iluvatar)
#### Post date: [October 25, 2023, 6:26am UTC](https://collective.flashbots.net/t/a-list-of-order-flow-auction-ofa-protocols/2573/3 "2023-10-25T06:26:45Z")

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Thank you, I have updated the list.  
I realize that rather than a list of categories it could be a matrix with one axis being the category (RPC/Intent/DEX) and the other one being the bidding model: individual tx bidding vs batch of txs bidding.

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### Author: ![jmcph4](https://collective.flashbots.net/letter_avatar_proxy/v4/letter/j/7bcc69/32.png) [@jmcph4](https://collective.flashbots.net/u/jmcph4)
#### Post date: [June 27, 2024, 12:27am UTC](https://collective.flashbots.net/t/a-list-of-order-flow-auction-ofa-protocols/2573/4 "2024-06-27T00:27:53Z")

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What would be especially useful is if these were sorted by the size of their respective order flows (whether number of transactions or fee volume).