CDR #072 Mean Finance | GRAI Price Feed

Proposals CDRs - Custom Delivery Requests
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08 November, 2023

INTRODUCTION

Protocol: Mean Finance

Website: https://mean.finance

Integration: The integration will provide real-time price feeds for assets supported on Mean Finance’s DCA protocol. Mean Finance enables users to Dollar Cost Average (DCA) any ERC20 into any ERC20 with their preferred period frequency.

Use case: Oracle on DeFi

Blockchain: Arbitrum

REQUEST INFORMATION

Assets

Following assets will be included in the Oracle:

Asset Ticker Asset Blockchain Asset Address Asset Markets Overview Comments
GRAI Ethereum 0x15f74458aE0bFdAA1a96CA1aa779D715Cc1Eefe4 GRAI Asset Information

Methodology

  • Moving Average Price with Interquartile Range (MAIR) will be used to calculate the price for the asset. Learn more about it here.
  • 0.5% deviation threshold for updates trigger will be applied
  • 120s trades aggregation window size will be applied
  • The feed will be updated every 24h period if there are no deviation based updates

Notes

  • Asset specific calling convention

DELIVERY INFORMATION

Delivery Method Oracle on Arbitrum
Is testnet deployment required? No
Delivery Estimate 10 days
2

Thank you for requesting a data feed via DIA CDR. We confirm the CDR specifications were requested correctly. Find the oracle information below:

Oracle

The oracle is deployed and can be accessed here.

You can query for assets by calling the read function getValue() with parameters such as “GRAI/USD”. It will return two values:

  1. The price of the asset queried with 8 decimals
  2. The unix timestamp of the last update

You can see Solidity and Vyper code integration examples here or use a dedicated DIA oracles integration library described in detail here.

Calling Interface

We also deployed our asset specific calling convention contract for GRAI/USD here.

It can be used to query the latest value of this asset price. Further documentation on how it can be used can be found in our documentation.

Funding

Each deployed oracle has a separate gas wallet which is the only entity allowed to update oracle values based on selected parameters. To find out more information on how it works, visit the following link.

Please make sure to top up the gas wallet, as we only put in some gas to deploy and start the oracle.

Gas Wallet address: 0x2eE55688343c2Ad881BDd3230a08896f6d33B897

Markets

You can view the markets included for each feed by pressing on a link to DIA App in the deployed assets list:

  1. Ethereum-0x15f74458aE0bFdAA1a96CA1aa779D715Cc1Eefe4
  2. Arbitrum-0x894134a25a5faC1c2C26F1d8fBf05111a3CB9487

Note: DIA uses Blockchain-Address querying formatting to ensure asset selection precision (token symbols might duplicate)

You can also query current asset prices and find other market information on the asset by using the DIA API as described here.

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