{"title":"CRV Interest Rate Curve Upgrade","discussions":"https://governance.aave.com/t/arfc-crv-interest-rate-curve-upgrade/11337","shortDescription":"Upgrade the CRV interest rate curve across Ethereum v2, Polygon v3, and Polygon v2 Liquidity Pools","author":"Llama","created":"2023-02-27T00:00:00.000Z","preview":"# Simple Summary\n\nLlama presents a proposal to update the CRV …","basename":"CRV-INTEREST-RATES","description":"\n\n# Simple Summary\n\nLlama presents a proposal to update the CRV interest rate parameters on the Aave Ethereum v2, Polygon v3, and Polygon v2 Liquidity Pools.\n\n# Abstract\n\nThe CRV SupplyCap on the Polygon v3 deployment is currently at 100% with borrowing costs of 5.02% with a Utilization of 31.51% relative to a 45% Uoptimal value, [1]. This proposal intends to increase the CRV SupplyCap on Polygon v3 deployment, improve the capital efficiency of each liquidity pool, and increase the amount of revenue generated across the various CRV reserves.\n\nCapital efficiency is improved on active reserves by increasing the Uoptimal value. Revenue is increased by introducing a Base interest rate, increasing the Slope1 and aligning the Reserve Factor to 20% across all pools. \n\nThis AIP is expected to lead more CRV revenue and significantly reduce the amount of free CRV in active reserves.\n\n# Motivation\n\nWith the CRV reserve on Polygon reaching its SupplyCap, this is an ideal time to implement an upgrade that addresses the SupplyCap and Interest Rate parameters. \n\nThe current CRV Interest Rate reflects the original parameters implemented when the liquidity pools were deployed. The Interest Rate Parameters do not take into consideration the alternative use cases for CRV and consequently, Aave has missed out on revenue from the sustained borrowing demand.\n\nLlama expects the sustained borrowing demand to continue due to Curve's veTokenomics presenting several opportunities for CRV borrowers to earn yield. \n\nIn this proposal, the Uoptimal parameter is to be increased from 45% to 70%, which improves the capital efficiency of active reserves.\n\n![](https://i.imgur.com/BhKxsuS.png)\n\n![](https://i.imgur.com/GZNc30u.png)\n\nSpecific to the Polygon v3 deployment, increasing the Uoptimal parameter from 45% to 70% will lead to an increase in the BorrowCap, which is a function of the SupplyCap and Uoptimal parameter.\n\nBorrowCap = SupplyCap * (Uoptimal + 0.1)\n\nThe new SupplyCap parameter has been prepared by Chaos Labs, 1,125.24K. This generates a new Borrow Cap of 900.19K, [2].\n\n![](https://i.imgur.com/VDtUak2.png)\n\nThe interest rate at the current Optimal point is 7%.\n\n![](https://i.imgur.com/g0jtJql.png)\n\nThis proposal recommends introducing a Base and increasing the Slope1 parameter to 3% and 14% respectively. This will lead to a substantial change to the current curve. Over time, we will monitor the reserve and amend the Slope1 parameter to optimize for risk exposure and revenue generation.\n\nThe graphic below shows the changes in the interest rate.\n\n![](https://i.imgur.com/WMT8KMn.png)\n\nThe Reserve Factor on Polygon v3 is to be increased from 10% to 20%, bringing it in line with all other Aave deployments.\n\n# Specification\n\nThe below table shows the current and proposed changes to the CRV Reserve on Polygon v3, Polygon v2 and Ethereum v2.\n\n**Polygon v3 - Active**\n\n|Parameter|Current|Proposed|\n| --- | --- | --- |\n|SupplyCap|937,700 units|1,125,240 units|\n|BorrowCap|640,440 units|900,190 units|\n|Uoptimal|45.00%|70.00%|\n|Variable Base|0.00%|3.00%|\n|Variable Slope1|7.00%|14.00%|\n|Variable Slope2|300.00%|300.00%|\n|Reserve Factor|10.00%|20.00%|\n|Stable Borrowing|Disabled|Disabled|\n|Stable Slope1|0.00%|8.00%|\n|Stable Slope2|0.00%|300.00%|\n|Base Stable Rate Offset|2.00%|3.00%|\n|Stable Rate Excess Offset|5.00%|5.00%|\n|Optimal Stable To Total Debt Ratio|20.00%|20.00%|\n\n**Polygon v2 - Frozen**\n\n|Parameter|Current |Proposed|\n| --- | --- | --- |\n|Uoptimal|45.00%|45.00%|\n|Base|0.00%|3.00%|\n|VariableSlope1|7.00%|14.00%|\n|VariableSlope2|300.00%|300.00%|\n|StableSlope1|10.00%|17.00%|\n|StableSlope2|300.00%|300.00%|\n|Reserve Factor|20.00%|20.00%|\n\n**Ethereum v2 - Frozen**\n\n|Parameter|Current|Proposed|\n| --- | --- | --- |\n|Uoptimal|45.00%|45.00%|\n|Base|0.00%|3.00%|\n|VariableSlope1|7.00%|14.00%|\n|VariableSlope2|300.00%|300.00%|\n|StableSlope1|10.00%|17.00%|\n|StableSlope2|300.00%|300.00%|\n|Reserve Factor|20.00%|20.00%|\n\n# Implementation\n\n**Polygon v3**\n\nTest cases can be found [here](https://github.com/llama-community/aave-crv-interest-rate-updates/blob/main/src/test/ProposalPayloadV3E2E.t.sol)\n\nPayload Implementation can be found [here](https://github.com/llama-community/aave-crv-interest-rate-updates/blob/main/src/ProposalPayloadPolygon.sol)\n\nNew Interest Rate Strategy deployment script can be found [here](https://github.com/llama-community/aave-interest-rate-strategy-deployer-v3/tree/main/script)\n\nProposal Payload deployed address can be found [here](https://polygonscan.com/address/0x3b6532efb7a60711f8f3fa77a589a726c836f4cf)\n\nInterest Rate Strategy deployed address can be found [here](https://polygonscan.com/address/0xBefcd01681224555b74eAC87207eaF9Bc3361F59)\n\n**Polygon v2**\n\nTest cases can be found [here](https://github.com/llama-community/aave-crv-interest-rate-updates/blob/main/src/test/ProposalPayloadV2E2E.t.sol)\n\nPayload Implementation can be found [here](https://github.com/llama-community/aave-crv-interest-rate-updates/blob/main/src/ProposalPayloadPolygon.sol)\n\nNew Interest Rate Strategy deployment script can be found [here](https://github.com/llama-community/aave-interest-rate-strategy-deployer/tree/main/script)\n\nProposal Payload deployed address can be found [here](https://polygonscan.com/address/0x3b6532efb7a60711f8f3fa77a589a726c836f4cf)\n\nInterest Rate Strategy deployed address can be found [here](https://polygonscan.com/address/0x334c59E5a50932a3C34AC39AB12131C648Cc1aE8)\n\n**Ethereum v2**\n\nTest cases can be found [here](https://github.com/llama-community/aave-crv-interest-rate-updates/blob/main/src/test/ProposalPayloadV2E2E.t.sol)\n\nPayload Implementation can be found [here](https://github.com/llama-community/aave-crv-interest-rate-updates/blob/main/src/ProposalPayload.sol)\n\nNew Interest Rate Strategy deployment script can be found [here](https://github.com/llama-community/aave-interest-rate-strategy-deployer/tree/main/script)\n\nProposal Payload deployed address can be found [here](https://etherscan.io/address/0xbacbe678e2c59343024fd5755262c7b0f77867d1)\n\nInterest Rate Strategy deployed address can be found [here](https://etherscan.io/address/0x5E6EFF5bEFe97c8b87BEa94F6e9940156CC47027)\n\n\n# Security Considerations\n\nThe proposal Payload was reviewed by [Bored Ghost Developing](https://bgdlabs.com/).\n\n# Governance Considerations\n\nAave [governance forum discussion](https://governance.aave.com/t/arfc-crv-interest-rate-curve-upgrade/11337), [Snapshot vote](https://snapshot.org/#/aave.eth/proposal/0x56aaf192f5cad8277b0e7c82abad030c62bb8fcfe4f2640ce5b896ab04397c20) and [Risk Service Provider feedback](https://governance.aave.com/t/arfc-crv-interest-rate-curve-upgrade/11337/9).\n\n# References\n\n1. https://app.aave.com/reserve-overview/?underlyingAsset=0x172370d5cd63279efa6d502dab29171933a610af&marketName=proto_polygon_v3\n2. https://governance.aave.com/t/aave-v3-borrow-caps-methodology/10925\n3. https://creativecommons.org/publicdomain/zero/1.0/\n\n# Copyright\n\nCopyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).\n"}