Swapping is the exchange between one whitelisted sbAsset and another at a 1:1 ratio. Swaps do not affect the number of niAssets in circulation.

Zero Slippage Swaps

Unlike other liquidity pool models such as Uniswap and Balancer, NEPRIM will employ a straight-line bonding curve between sbAssets, meaning that anyone can trade these underlying stablecoins at a 1:1 ratio.
These swaps will incur no price slippage, and so long as they do not breach weight requirements, can be for any quantity. NEPRIM will charge a fixed swap fee in exchange for this. In our nYUSD basket, for example, users will be able to swap between these underlying stablecoins: USDT, USDC, BUSD, TUSD, USDC, sUSD, and DAI.


NEPRIM will pool stablecoins and tokenized assets of similar value. For example, nYUSD will pool USD stablecoins, nBTC will pool tokenized BTC, and so on. These tokenized assets are selected by NEPRIM governors and are deemed to have adequate security guarantees against peg loss. This has important implications, one being: any deviation from the peg of an underlying asset is highly likely to be impermanent.
Take USD stablecoins as an example. Say we allow 4 USD stablecoins in the basket. These stablecoins will constantly move slightly from their $1.00 peg, but over time they are very likely to trade around $1.00. For any given period, each stablecoin's price over time will look something like this:
So far, 100% of the peg deviations of the major USD stablecoins have been impermanent. Since these losses are impermanent, we can allow our bonding curve to be constant, namely:
Therefore, the USD stablecoins can be exchanged 1 for 1, a constant bonding curve. The slope is constant, meaning price is independent of supplies of coin x and coin y.
In sum:
    Apart from a trading fee, there will be zero slippage trading stablecoins and tokenized assets on NEPRIM. Price will remain the same independently of assets in the basket.
    Since assets are interchangeable, NEPRIM will allow minting and redemption of any coin instead of the exact basket (as long as max weights are not breached).


The swapfunction will be used to arbitrage between sbAssets when a spread exists. This will occur when:
    When the price differential is greater than the swap fee plus its gas cost.
    There is excess room in the system between a sbAsset and its max weights to allow NEPRIM to take on more of that undervalued asset.
This persistent arbitrage implies that the price of the niAsset will track the value of the lowest price underlying assets at their maximum weights. We do not judge this to be an issue, as we believe impermanent losses between stablecoins are an inherent and normal part of the DeFi ecosystem. In fact, it will be a core pillar of NEPRIM YIELD product, which is in part built to compensate nYUSD holders for their exposure to this impermanent loss.
NEPRIM should positively contribute to the efficiency of stablecoin markets, whilst simultaneously allowing arbitrageurs and the platform to profit from normal and safe oscillations in stablecoin prices.

Maximum Weights

Allowing users to swap bAssets at 1:1 introduces risks into the system that must be managed. As a result of this, the system has been built so that no individual bAsset can exceed a maximum weight for any given bAsset (35%, of the total, for example). If an underlying bAsset has hit its maximum weight, the rules governing the system change so that minting, redemption, and swap rules are altered.

Swaps at maximum weight

Swaps that would push a bAsset above its max weight are not allowed. Swaps that do not affect the bAsset at maximum weight are unaffected.

Minting and Redemption at maximum weight

Minting and redemption activities that would push a bAsset above its max weight are not allowed. Importantly, those wishing to redeem niAssets at these times must redeem the basket at its underlying weights; this is presented as "multi redemption". Read more in the Forging section.

Swap Fees

Swap fees are a flat fee, charged in the asset received by a user. These fees will be set by Governors.
Last modified 8mo ago