How Rewards Work (NAV / share price)

PrimeStaking V3 is a fully on-chain, ERC-4626 staking vault. Rewards are not paid through a manual claim flow. They are embedded directly in the psXDC share price. This page explains how the rate accrues and how the NFT boost layer sits on top.

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Two layers of yield

                base yield (~4.5%)               boost slice (up to ~1.5%)
                       │                                  │
                       ▼                                  ▼
   shares × NAV(t) appreciation     +     Synthetix-style accumulator
   (every psXDC holder gets this)         (only XDC NFT holders get this)

Layer	Where it lives	Who earns it	How you receive it
Base NAV	PrimeStakedXDC_V3_2 vault share price	Every psXDC holder	Automatic: share price rises as validator rewards accrue. No claim.
NFT Boost	XdcNftStakingVault Synthetix accumulator	Only NFTs that have psXDC shares staked inside them	Claimed from the NFT detail page in the app.

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Base layer: share-price growth

When XDC validator rewards flow back into the vault, totalAssets() increases while the total share supply stays the same. The vault's exchange rate (totalAssets / totalShares) goes up, so every psXDC share becomes worth more XDC.

V3.2 permanent-ledger model. In V3.2 the operations manager credits rewards through a dedicated reward lane (distributeRewards), which raises the share price for every holder. Rewards accrue at any backing level - there is no "fully backed" gate. An optional, hard-capped protocol fee (0% by default, max 20%) can be skimmed per distribution. The share price only ever moves up through this lane; there is no code path that writes it down outside of a rate-limited, risk-manager-only validator-loss report.

Aspect	Detail
Target APY	~4.5%
Mechanism	Exchange rate appreciation
When you receive it	Continuously; visible the next time the vault syncs reward inflows
User action required	None. There is no "claim rewards" button

Example. Stake 1,000 XDC when the exchange rate is 1.00. You receive 1,000 psXDC shares. Six months later the rate is 1.025. You burn your 1,000 shares and the vault returns 1,025 XDC. Your 25 XDC of yield was inside the price the whole time.

This is the same model used by Aave aTokens, Compound cTokens, and Lido wstETH.

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NFT boost: additional slice for stakers

XDC NFTs stack a second yield on top of the base NAV. The protocol's XdcNftBoostHarvester periodically pushes XDC into the NFT vault via notifyBoost. That XDC is converted to psXDC v3 shares inside the vault and parked as boostReserve. A Synthetix-style accumulator distributes the reserve to staked NFTs in proportion to their weight:

weight = stakedShares × (rarityMultiplier + level + lockBonus)

Component	Effect on weight
stakedShares	More psXDC staked inside the NFT → bigger slice
rarityMultiplier	Plentiful (lowest) → Handcrafted (highest); set at mint, immutable
level	Increases when the NFT levels up via merge
lockBonus	Added when the NFT is locked, sized by the chosen lock tier (30/90/180/365 days). Ends automatically when the lock expires and can be renewed by re-locking.

When you claim from an NFT, the accumulator settles your pending boost and pays it out in XDC.

Aspect	Detail
Target APR band	~0.25% (Plentiful unlocked) → ~1.5% (Handcrafted locked)
Mechanism	notifyBoost(x) increments rewardPerWeightStored; each NFT's earned = info.shares × (rewardPerWeightStored − info.rewardIndex) × weight / 1e18
When you receive it	When you call claim on the NFT
User action required	Yes: claim from the NFT detail page, or it settles automatically on any other state-changing action (stake more, lock, merge, withdraw)

The boost cadence depends on how often the harvester feeds the accumulator; see Boost Harvester (technical) for the full picture.

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Combined targets

Position	Base NAV (floor)	+ Boost slice (when flowing)	Combined target
Plain psXDC (no NFT)	~4.5%	None	~4.5%
psXDC inside an unlocked NFT	~4.5%	~0.25%	~4.5% → ~4.75%
psXDC inside a locked NFT	~4.5%	up to ~1.5%	~4.5% → up to ~6%

The floor for every staked psXDC (whether you hold it directly, in an unlocked NFT, or in a locked NFT) is the base ~4.5%. That layer is automatic. The boost slice (~0.25% → ~1.5%) is an additional stream that depends on harvester cadence and your NFT's weight; when the stream is paused or sparse, you continue to earn the base.

The exact boost slice depends on your NFT's rarity, level, and lock status relative to the rest of the vault, and on how much XDC the harvester has fed recently. The vault publishes BoostNotified events so the UI can show a trailing 30-day boost APR alongside the static targets.

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Why no claim button for liquid staking

The V2 product distributed rewards by having the owner periodically call notifyRewardAmount and required users to call claim to collect their share. V3 removes both:

• No notifyRewardAmount: validator rewards flow directly into the vault, so the exchange rate updates automatically.

• No claim: your reward is already inside the share. When you redeem the share, you receive both the principal and the accrued reward in one transaction.

The boost layer keeps its claim flow because it is a separate XDC stream layered on top of the share, not an internal accrual.

→ Understanding Share Price → V2 vs V3: What Changed