Fathom v3 (XDC)

What the v3 toggle in the PrimeFi app actually is, and where to get support.

The PrimeFi app header has a v2 / v3 toggle. This page explains what v3 means.

TL;DR

• v2 = PrimeFi. Operated by Prime Numbers Labs on Base, HyperEVM and XDC. This is the protocol the rest of this documentation describes.

• v3 = Fathom Lending. A separate, third-party Aave v3 fork operated by Fathom Protocol on the XDC network. PrimeFi surfaces it inside our app as a convenience so users can access both markets from one interface, but PrimeFi does not operate, custody or take responsibility for the v3 contracts.

For anything related to Fathom v3 (supply, borrow, collateral, health factor, liquidations, oracle questions, contract addresses, audits, support tickets), please use the official Fathom Lending documentation and support channels — not PrimeFi's.

Fathom Lending — official resources

What you need	Where to go
Lending docs (root)	docs.fathom.fi/lending
XDC deployment & contract list	docs.fathom.fi/lending/deployments/xdc-network
How to supply / borrow / repay	docs.fathom.fi/lending/user-guides/supply-borrow-repay-and-withdraw-asset
FXD stablecoin (related product)	docs.fathom.fi/fxd-stablecoin
Fathom dApp	app.fathom.fi

What's different between v2 and v3 inside the PrimeFi UI

Feature	PrimeFi (v2)	Fathom (v3)
Chains	Base, HyperEVM, XDC	XDC only
Underlying protocol	PrimeFi (Aave v2 fork + omnichain layer)	Fathom Lending (Aave v3 fork)
Reserves	USDC, USDT, ETH, HYPE, WBTC, XDC, PSXDC, PRFI etc.	FXD, FTHM, WXDC and other Fathom reserves
pLP boost / PRFI emissions	Yes (where chef is active — currently Base)	No — Fathom has its own incentive model
Cross-chain borrow (Stargate)	Yes	No
Auto-compound / vesting / locked pLP	Yes	No
Prime Points eligibility	Yes	No
Smart contract operator	Prime Numbers Labs	Fathom Protocol
Audits	See Audits	Halborn Formal Verification (March 2026) — see Fathom docs

How to switch versions

Open the PrimeFi app, look at the header on the top right, and click the v2 / v3 pill. The app will:

1. Update the active market and reserves list.

2. Switch your wallet to the appropriate chain (XDC for v3).

3. Hide PrimeFi-specific surfaces that don't apply to Fathom (pLP tabs, Prime Points, Flik, Prepaid Gas).

If you're on a PrimeFi-only page like /plp or /prime-points when you toggle to v3, the app will bounce you to the Dashboard.

Contract addresses

• PrimeFi v2 contracts are documented under Smart Contracts Addresses.

• Fathom v3 contracts are listed in the Fathom XDC deployment doc, with the canonical source being Fathom's own deployment page.