Dual-asset architecture

Fuego’s financial layer is built on two native assets and shared fee plumbing.

Assets

Asset	What it is	How you get it
XFG	Base-layer CryptoNote privacy coin	Mine, receive, atomic swap in
HEAT	Flatcoin / colored commitment outputs	Mint by burning XFG (`mintHeatV10`) priced by Hearth TWAP

Legacy names that are not the current model:

Embers_Heat / fixed 10M:1 conversion — deprecated; do not use convertXfgToHeat() for minting
COLD deposits — removed
XFG term deposits as CDs — removed; CDs lock HEAT

Two-step deposit model

1) Mint HEAT     burn XFG → HEAT   (term == HEAT_TERM / mintHeatV10)
2) Open a CD     lock HEAT → yield (term is a real block/epoch length, ≠ HEAT_TERM)

Step 2 is the only “deposit” that earns APY. You cannot deposit a deposit, and you cannot skip minting and lock XFG as a CD. Details: DEPOSIT_ARCHITECTURE.md (repo) and How CDs work.

Hearth

Hearth is the on-chain XFG/HEAT market (constant-product AMM plus orderbook / depth-band machinery). It:

Sets the TWAP / spot rate used when minting HEAT
Charges HEARTH_FEE_BPS = 100 (1%) per trade → 100% CD yield accumulator in consensus code (LPs earn the swap spread, not the fee)

swapXFG

swapXFG (SwapDaemon) is peer-to-peer cross-chain atomic swap infrastructure (adaptor signatures / chain clients). Completed XFG-side swaps charge 1%, split 69% CD yield / 11% Bonus Vault / 20% Treasury.

Fee map (code)

Constant	Value	Meaning
`SWAP_FEE_RATE_BPS`	100	1% on XFG atomic-swap side
`SWAP_FEE_CD_SHARE_PCT`	69	→ CD yield pool
`SWAP_FEE_BONUS_VAULT_PCT`	11	→ Bonus Vault
`SWAP_FEE_TREASURY_SHARE_PCT`	20	→ Treasury
`HEARTH_FEE_BPS`	100	1% Hearth trade fee
Hearth split	100/0	`cdHearthFeeAccumulator += totalFee` (100% CD; LP income = spread)
`EPOCH_DURATION_BLOCKS`	900	Mainnet epoch (~5 days at ~480s blocks)
`CD_MIN_EPOCHS` / `CD_MAX_EPOCHS`	6 / 72	~1 month … ~1 year HEAT CD terms

Mental model

          ┌─────────────┐
   mine / │     XFG     │── burn ──► HEAT mint (TWAP)
   swap   └──────┬──────┘              │
                 │                     ▼
                 │              ┌─────────────┐
                 └──── Hearth ──┤    HEAT     │── lock ──► CD yield
                        ▲       └─────────────┘
                        │
              swap fees + Hearth fees
                        │
                        ▼
              CD pool / Bonus / Treasury / LP

Start

Getting started

Architecture

HEAT

HEAT CDs

Hearth

swapXFG

Tutorials

API reference

Security

Developer

Optional / other

Dual-asset architecture

Assets

Two-step deposit model

Hearth

swapXFG

Fee map (code)

Mental model

​Assets

​Two-step deposit model

​Hearth

​swapXFG

​Fee map (code)

​Mental model

Assets

Two-step deposit model

Hearth

swapXFG

Fee map (code)

Mental model