Maker DAO is the protocol for supporting the stable token, DAI. This article is the description of the protocol based on the real examples of transactions, illustrated by graphs from bloxy.info web site.
Introduction
The protocol is implemented as smart contracts:
Sai Tub:
which accepts wrapped Ether ( WETH ) as the collateral for DAI debt, and
Sai Tap:
which is giving DAI to lenders
The protocol is described in . We took the text description from this source, but illustrated it by real example of transactions, using the graphical presentation from bloxy.info web site. Every illustration is accompanied with the link to the transaction it shows. You can investigate this particular transaction by clicking the link, or investigate even further, by finding similar transactions on the contract.
We believe this material will help to better understand Maker DAO protocol and use it in all possible variety of ways.
Join Collateral Pool
Join the collateral pool by depositing ETH in exchange for PETH (pooled ether).
- The amount should be specified in units of
PETH. - ETH will be debited from the caller at the join price (
ask)
Exit Collateral Pool
Withdraw collateral by returning PETH to the vault in exchange for the proportional amount of ETH.
- The amount should be specified in units of
ETH. - PETH will be debited from the caller at the exit price (
bid)
Will return more or less ETH for each PETH than at join depending whether the system made a profit or loss over the lifetime of the collateral deposited to the pool.
Open CDP
Create an empty CDP and set the caller to be the owner.
Give CDP
Transfer a CDP to a different owner. (changes lad)
Lock CDP
Add PETH collateral (increases ink).
More complicated case, with ETH initially converted:
Free CDP
Remove PETH collateral (decreases ink).
More complicated case, with the conversion back to ETH
Draw DAI
Issue a specified amount of Dai (increases art, rum)
More complicated, with intermediary smart contract sending DAI to the guy
Wipe DAI
Repay some portion of outstanding Dai debt (decreases art, rum).
More complicated case, where DAI exchanged to pay MKR fee. DEX exchange Oasis used for this:
Shut CDP
Close a CDP. Clear all debt, unlock all collateral and delete the record.
Collateral will be used to pay any outstanding debt at market rate. Remaining collateral will be returned to the pool.
More complicated case, using Oasis to exchange DAI to MKR:
Even more complicated, with Uniswap involved:
Bite CDP
Liquidate a vunerable CDP (zeros art, decreases ink).
Unsafe CDPs need to be liquidated. When a cup is not safe, anyone can perform bite(cup), which takes on all CDP debt and confiscates sufficient collateral to cover this, plus a buffer.
This returns the CDP to a safe state (possibly with zero collateral).
There are other possible implementations of bite, e.g. only taking sufficient collateral to just transition the CDP to safe, but the described implementation is chosen for simplicity.
More complicated case
Boom Debt
Buy dai when the system is in surplus.
Can be thought of as buy and burn. Given a net Dai balance, sell the Dai in return for PETH, which is burned.
Bust
Sell dai when the system is in deficit.
bust is really two functions in one: collateral sell off (aka flip), and inflate and sell (aka flop). When fog is non zero it is sold in return for Dai, which is used to cancel out the bad debt, woe. If fog is zero but the tap has a net Sin balance, then PETH is minted and sold in return for Dai, up to the point that the net Sin balance is zero.
Vox Target Price
The vox provides the Dai target price, given in terms of the reference unit, by par. For example, par == 2 with USD as the reference unit implies a target price of 2 USD per Sai.
The target price can vary in time, at a rate given by way, which is the multiplicative rate of change per second.
In Dai 1.0 the sensitivity, how, is set to zero. Adjustments to the target price are made by adjusting the rate of change, way, directly with coax. In future iterations, how may be non-zero and way adjustments will then follow automatically via the feedback mechanism. The vox component is subject to ongoing economic modelling research.
This article was composed from the data and by analytical tools from analytical engine. web site provides a set of tools for analytics, traders, companies and crypto enthusiasts.The tools include APIs, dashboards and search engine, all available on-site, providing accurate data, indexed directly from the blockchain live node.
Bloxy mission is to make blockchain more transparent and accessible to people and businesses.
Please, make a reference to the source of data when referencing this article.
Published at Wed, 08 May 2019 20:13:29 +0000
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