Sky Protocol

Sky (formerly MakerDAO) is a decentralized protocol for stablecoin savings, governance, and token migration. This plugin exposes two ERC-4626 vaults (the sUSDS savings vault and the stUSDS staked vault), token balance and approval actions for USDS, DAI, and SKY, and converters for migrating legacy DAI to USDS and legacy MKR to SKY.

Supported chains: Ethereum (all contracts), Base (sUSDS, USDS), Arbitrum (sUSDS, USDS). Read-only actions work without credentials. Write actions require a connected wallet.

Actions

Sky is a multi-contract protocol, so actions are grouped below by the contract that exposes them. Each vault (sUSDS and stUSDS) is a standard ERC-4626 vault and exposes the same 18 vault actions; stUSDS uses a st-usds- slug prefix and a “stUSDS” label prefix to distinguish it from the sUSDS vault.

sUSDS Savings Vault

Action	Slug	Type	Description
Vault Deposit	`vault-deposit`	Write	Deposit assets into the vault and receive shares
Vault Mint	`vault-mint`	Write	Mint exact vault shares by depositing the required amount of assets
Vault Withdraw	`vault-withdraw`	Write	Withdraw assets from the vault by specifying asset amount
Vault Redeem	`vault-redeem`	Write	Redeem shares from the vault for underlying assets
Vault Underlying Asset	`vault-asset`	Read	Get the address of the underlying asset token for this vault
Vault Total Assets	`vault-total-assets`	Read	Get the total amount of underlying assets held by the vault
Vault Total Supply	`vault-total-supply`	Read	Get the total supply of vault shares
Vault Share Balance	`vault-balance`	Read	Get the vault share balance of an address
Convert Shares to Assets	`vault-convert-to-assets`	Read	Convert a vault share amount to its underlying asset value at the current rate
Convert Assets to Shares	`vault-convert-to-shares`	Read	Convert an asset amount to the equivalent vault shares at the current rate
Preview Vault Deposit	`vault-preview-deposit`	Read	Preview how many shares a given asset deposit would yield
Preview Vault Mint	`vault-preview-mint`	Read	Preview how many assets are needed to mint a given number of shares
Preview Vault Withdraw	`vault-preview-withdraw`	Read	Preview how many shares must be burned to withdraw a given asset amount
Preview Vault Redeem	`vault-preview-redeem`	Read	Preview how many assets a given share redemption would yield
Max Vault Deposit	`vault-max-deposit`	Read	Get the maximum amount of assets that can be deposited for a receiver
Max Vault Mint	`vault-max-mint`	Read	Get the maximum number of shares that can be minted for a receiver
Max Vault Withdraw	`vault-max-withdraw`	Read	Get the maximum amount of assets that can be withdrawn by an owner
Max Vault Redeem	`vault-max-redeem`	Read	Get the maximum number of shares that can be redeemed by an owner

Available on Ethereum, Base, and Arbitrum.

stUSDS Staked Vault

Same 18 actions as the sUSDS vault above, with a st-usds- slug prefix and a “stUSDS” label prefix, for example “stUSDS Vault Deposit” (st-usds-vault-deposit) and “stUSDS Vault Share Balance” (st-usds-vault-balance). Use the “stUSDS Vault Underlying Asset” (st-usds-vault-asset) action to read which token the staked vault wraps. Available on Ethereum only.

USDS Stablecoin

Action	Slug	Type	Description
Get USDS Balance	`get-usds-balance`	Read	Check the USDS balance of an address
Approve USDS Spending	`approve-usds`	Write	Approve a spender to transfer USDS on your behalf

Available on Ethereum, Base, and Arbitrum.

DAI Stablecoin (Legacy)

Action	Slug	Type	Description
Get DAI Balance	`get-dai-balance`	Read	Check the DAI balance of an address
Approve DAI Spending	`approve-dai`	Write	Approve a spender to transfer DAI on your behalf

Ethereum only.

SKY Governance Token

Action	Slug	Type	Description
Get SKY Balance	`get-sky-balance`	Read	Check the SKY balance of an address

Ethereum only.

DAI-USDS Converter

Action	Slug	Type	Description
Convert DAI to USDS	`convert-dai-to-usds`	Write	Convert DAI to USDS at a 1:1 rate via the official converter
Convert USDS to DAI	`convert-usds-to-dai`	Write	Convert USDS back to DAI at a 1:1 rate via the official converter

Ethereum only. Requires prior DAI or USDS approval for the converter contract (use Approve DAI Spending / Approve USDS Spending).

MKR-SKY Converter

Action	Slug	Type	Description
Convert MKR to SKY	`convert-mkr-to-sky`	Write	Convert MKR governance tokens to SKY via the official converter (one-way)

Ethereum only. Requires prior MKR approval for the converter contract.

Example Workflows

Monitor USDS Balance with Alert

Schedule (daily) -> Sky: Get USDS Balance -> Math (Sum, divide by 1e18) -> Condition (< 100) -> Discord: Send Message

Check your USDS balance daily, convert from wei to decimal, and send a Discord alert if it drops below 100 USDS.

Auto-Deposit Idle USDS into Savings

Schedule (hourly) -> Sky: Get USDS Balance -> Math (Sum, divide by 1e18) -> Condition (> 500) -> Sky: Approve USDS Spending -> Sky: Vault Deposit

Periodically check for idle USDS and automatically deposit into the sUSDS savings vault when the balance exceeds a threshold. Requires wallet connection.

Track Savings Yield

Schedule (daily) -> Sky: Vault Share Balance -> Sky: Convert Shares to Assets -> Math (Sum, divide by 1e18) -> Webhook: Send HTTP Request

Monitor your sUSDS position, convert shares to their current USDS value, and send the result to an external webhook for portfolio tracking.

DAI Migration Pipeline

Manual -> Sky: Get DAI Balance -> Math (Sum, divide by 1e18) -> Condition (> 0) -> Sky: Approve DAI Spending -> Sky: Convert DAI to USDS -> Sky: Vault Deposit

One-click migration of DAI holdings: check balance, approve the converter, convert to USDS, and deposit into the sUSDS savings vault. Ethereum only.

Supported Chains

Chain	Contracts Available
Ethereum (1)	sUSDS Savings Vault, stUSDS Staked Vault, USDS, DAI, SKY, DAI-USDS Converter, MKR-SKY Converter
Base (8453)	sUSDS Savings Vault, USDS
Arbitrum (42161)	sUSDS Savings Vault, USDS

The sUSDS savings vault and USDS stablecoin are available on all three chains. The stUSDS staked vault, DAI, SKY, and the converter contracts are Ethereum-only.