# LINK Oracle Report

**URL:** https://forum.euler.finance/t/link-oracle-report/105
**Category:** Oracle Reports
**Created:** [March 24, 2022, 9:17pm UTC](https://forum.euler.finance/t/link-oracle-report/105 "2022-03-24T21:17:12Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![seraphim](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.euler.finance/seraphim/32/33_2.png) [@seraphim](https://forum.euler.finance/u/seraphim)
#### Post date: [March 24, 2022, 9:17pm UTC](https://forum.euler.finance/t/link-oracle-report/105/1 "2022-03-24T21:17:12Z")

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# Summary

Using our risk framework and Uniswap V3 [price impact tool](https://oracle.euler.finance/) we give LINK a strong oracle rating.

This report is related to [eIP 6.](https://forum.euler.finance/t/eip-6-promote-link-to-collateral-tier/104/2)

# Methodology

For maximum security of the oracle, it needs to fulfil 3 criteria:

1. Liquidity is provided over the full price range
2. Elevating the TWAP (Time-Weighted-Average-Price) to a meaningful extent is impossible or extremely costly.
3. Depressing the TWAP to a meaningful extent is impossible or extremely costly.

For more in-depth research on the nature of attacking TWAPs, check out [Michael Bentley’s research paper](https://github.com/euler-xyz/uni-v3-twap-manipulation/blob/master/cost-of-attack.pdf) and [Seraphim Czecker’s video explanation](https://www.youtube.com/watch?v=snwUwj3QQ7M&t=1s&ab_channel=EulerFinance).

# Analysis

## Full Range

 ![image](https://canada1.discourse-cdn.com/flex007/uploads/euler/original/1X/54f3b8e1f98bc2bbed3f1ce8df7a769caf6d9319.png)

[https://info.uniswap.org/#/pools/0xa6cc3c2531fdaa6ae1a3ca84c2855806728693e8](https://info.uniswap.org/#/pools/0xa6cc3c2531fdaa6ae1a3ca84c2855806728693e8)

LINK/WETH appears to have full range liquidity (non-zero% is 100%) provided by a multitude of liquidity providers (64895 initialised #).

## Cost of Attack

We have analysed the cost of moving the TWAP of XYZ/WETH by 20% up and down over 1 to 10 blocks. The results are:

 ![image](https://canada1.discourse-cdn.com/flex007/uploads/euler/original/1X/e9948409fa05afd750fb93fdffe77d9d6b84d44c.png)  
This shows that manipulating the TWAP over a 1-2 block attack (the most realistic for an attacker) would cost at least $639 million, which is clearly not feasible.

## Conclusion

Given the presence of full-range liquidity and substantial cost of attack, we give the asset above a strong oracle rating.

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### Author: ![Jinyoo](https://avatars.discourse-cdn.com/v4/letter/j/b2d939/32.png) [@Jinyoo](https://forum.euler.finance/u/Jinyoo)
#### Post date: [March 27, 2022, 4:53pm UTC](https://forum.euler.finance/t/link-oracle-report/105/2 "2022-03-27T16:53:03Z")

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Supporting this suggestion!

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### Author: ![euler\_mab](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.euler.finance/euler_mab/32/538_2.png) [@euler\_mab](https://forum.euler.finance/u/euler_mab)
#### Post date: [January 2, 2025, 2:27pm UTC](https://forum.euler.finance/t/link-oracle-report/105/3 "2025-01-02T14:27:34Z")

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### Author: ![euler\_mab](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.euler.finance/euler_mab/32/538_2.png) [@euler\_mab](https://forum.euler.finance/u/euler_mab)
#### Post date: [January 2, 2025, 4:01pm UTC](https://forum.euler.finance/t/link-oracle-report/105/4 "2025-01-02T16:01:14Z")

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