Reward Model: Base NAV + Boost

XDC NFTs in V3 earn from two stacked sources. There is no monthly XDC pool and no "PrimeFi ecosystem profit share" math. Both layers are fully on-chain and continuously accruing.

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The two layers

                  base APY (~5.5%)            boost APY (up to ~1.5%)
                       │                              │
                       ▼                              ▼
   shares × NAV(t) appreciation     +     Synthetix accumulator slice
   (the psXDC v3 share price)              (rarityMult + level + lockBonus weighted)

1. Base NAV: psXDC v3 share-price appreciation

Every psXDC v3 share grows in value as validator rewards flow into the underlying vault. When your NFT holds stakedShares of psXDC, the same share count is returned on withdraw, but each share is worth more XDC than it was on stake. This layer requires no action and no claim; it's already inside the shares.

Aspect	Detail
Target APY	~5.5%
How it accrues	Via PrimeStakedXDC_V3_1 share-price growth
When you realize it	When you withdraw shares from the NFT or burnAndRedeem

2. Boost: Synthetix accumulator inside the NFT vault

The protocol's XdcNftBoostHarvester periodically pushes XDC into the NFT vault via notifyBoost. The vault converts that XDC to psXDC v3 shares and credits the accumulator. Every staked NFT earns a slice proportional to its weight:

weight = stakedShares × (rarityMultiplier + level + lockBonus)

Aspect	Detail
Target APR band	~0.25% (Plentiful unlocked) → ~1.5% (Handcrafted locked)
How it accrues	rewardPerWeightStored increments on every notifyBoost; per-NFT earned is computed Synthetix-style
When you realize it	When you call claim(tokenId) from the NFT detail page (or automatically on any other state-changing action like stake/lock/merge/withdraw, which _settle first)
Reward asset	XDC (the harvester's payload is native XDC)

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Combined target ranges

Position	Base NAV (floor)	+ Boost slice (when flowing)	Combined target
Plain psXDC, no NFT	~5.5%	none	~5.5%
psXDC staked in an unlocked NFT	~5.5%	~0.25%	~5.5% → ~5.75%
psXDC staked in a locked NFT	~5.5%	up to ~1.5%	~5.5% → up to ~7%

The floor for every staked NFT is the base ~5.5%. That layer is purely psXDC v3 share-price growth. It accrues automatically and does not depend on rarity, level, lock status, or harvester cadence. Even if notifyBoost hasn't been called in a while, you still earn the base. The boost slice is an additional stream on top.

Your individual boost APR depends on:

• Your NFT's rarityMultiplier, level, and whether it's locked.

• How much psXDC you have staked (more shares → more weight → more slice).

• How active the harvester's notifyBoost stream has been recently.

The UI surfaces a trailing 30-day boost APR alongside the static targets so you can see what the stream has actually paid.

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Why no monthly pool

The V2 NFT system distributed rewards in a monthly batch process driven off-chain. V3 replaces this with a continuous, on-chain Synthetix accumulator for three reasons:

• Trust-minimized: the boost rate is a function of harvester pushes, not a manually-set monthly figure.

• Granular: earnings update on every notifyBoost, not once per month.

• Composable: partner integrations can read earned(tokenId) directly on-chain at any time.

There is no longer a "10% of PrimeFi profits" framing; the harvester's funding model is described in Boost Harvester (technical).

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Maximizing Your Rewards

Strategy	Effect
Stake more psXDC shares	More stakedShares → linear increase in weight
Merge two same-rarity NFTs	Higher rarityMultiplier on the result
Level the NFT	Higher level term, additive to the multiplier
Lock the NFT	Adds lockBonus to the weight, but disables withdraw/merge/burnAndRedeem until expiry
Hold higher-rarity NFTs	Higher base rarityMultiplier = larger slice for the same staked shares

→ Staking Mechanics → Boost Harvester (technical) → Smart Contract Reference