> ## Documentation Index > Fetch the complete documentation index at: https://docs.usexfg.org/llms.txt > Use this file to discover all available pages before exploring further. # User guide # Hearth — Fuego's On-Chain Exchange *The market where ΗΞΔŦ finds its price — and where your XFG becomes more than a balance.* *** ## Step into the Hearth Fuego is a blockchain that mints its own money — ΗΞΔŦ, the flatcoin — and **Hearth is where that money lives, moves, and grows**. It's an exchange that runs on the chain itself: no custody, no order books held by a company, no waiting on a centralized venue to decide what anything is worth. Every price on Hearth is discovered by the people trading on it — one clearing price, once per block, for everyone. This brochure is about what Hearth **lets you do**. Pick a path: | You want to… | Start here | | - | - | | Convert XFG into ΗΞΔŦ (or back) — instantly | [Swap](#swap) | | Trade at a price you set, then walk away | [Limit orders](#limit-orders) | | Put your XFG and ΗΞΔŦ to work together | [Provide liquidity](#provide-liquidity) | | Get paid for quoting the market | [Earn as a maker](#earn-as-a-maker) | | Lock ΗΞΔŦ and earn real yield | [Own Certificates of Deposit](/features/heat/mint-heat) | | Mint brand-new ΗΞΔŦ from XFG | [Mint on Hearth's price](/features/heat/mint-heat) | *** ## Swap The simplest door in: hand over one asset, receive the other at the market's current price, settled on-chain in the same block you asked. No account, no KYC, no middleman — your wallet is your exchange account. * **XFG → ΗΞΔŦ:** sell XFG into the pool, receive ΗΞΔŦ. * **ΗΞΔŦ → XFG:** buy XFG with ΗΞΔŦ. The pool prices every trade on a constant-product curve: a small trade fills near the current price, and a large one moves it — the more you trade at once, the less each extra coin buys. Before a sale, `sell_xfg` shows what you'll receive, where it leaves the pool's price, and what **minting** the same XFG would give instead, then asks before it sells. You always set a **minimum you're willing to accept**, so a fast-moving market can't fill you at a price you didn't agree to. ``` sell_xfg buy_xfg ``` From the wallet RPC (SimpleWallet `--rpc-bind` and walletd) the same trades are `sell_xfg` and `buy_xfg`, or `amm_swap` with `direction` 0 or 1. Minting is `heat_mint`. > Want ΗΞΔŦ without buying it? You can also **mint it** — burn XFG and receive fresh ΗΞΔŦ at Hearth's discovered price. See [minting ΗΞΔŦ](/features/heat/mint-heat). *** ## Limit orders Maybe you don't want the price right now — you want **your** price. Post a bid or an ask backed by real funds, and Hearth fills it automatically the moment the market crosses your level. Set it and walk away: fills, partial fills, and proceeds are all credited on-chain and claimable whenever you come back. * **Buy ΗΞΔŦ** below the market and wait for the pullback. * **Sell ΗΞΔŦ** at your target and let the market come to you. ``` place_order buy [exp_blocks] place_order sell [exp_blocks] cancel_order # claim deposit + proceeds whenever you like orderbook # see the live book and last clearing price ``` > The fee schedule is on your side when you post: **makers pay nothing — and actually get paid** (see below). Takers pay 1%, 70% of which flows to ΗΞΔŦ CD holders. *** ## Earn as a maker Every order that fills as the **maker** side — the liquidity someone else traded against — earns a **30% rebate of the taker fee**. Post liquidity on Hearth and your resting orders don't just wait: they work. The rebate lands in your order's proceeds automatically. There's no separate command — it's what your limit orders do by default. Post both sides at prices you believe in, and the market pays you for quoting it. *** ## Provide liquidity If you believe in the pair, become part of its depth. Add XFG **and** ΗΞΔŦ to the pool in a balanced pair, and you own a proportional slice of every trade's flow: * Your share of the pool's **trading P\&L** as prices move. * The **30% maker share of fees** whenever the pool is the counterparty. * Withdraw anytime by burning your LP shares for your proportional reserves. ``` add_liq [xfg_amount] [heat_amount] # no args = see the current pool ratio remove_liq claim_lp_fees ``` > Add liquidity with no args first — the pool expects a balanced pair at its current ratio, and it'll tell you exactly what that is. *** ## Own ΗΞΔŦ — and make it earn Hearth's 70% fee share feeds a yield pool for **ΗΞΔŦ Certificates of Deposit**. So the very same ΗΞΔŦ you trade on Hearth can be locked into a CD that earns protocol revenue — funded by real fees, never by printing. **Buy your ΗΞΔŦ on Hearth** (swap or limit order, or mint it), then lock it: ``` heat_cd claim_cd ``` The longer the term, the richer the loyalty tier. Yield comes from what traders pay — a market that pays its holders. *** ## Your money, your rules Everything you commit to Hearth stays yours: * **Every order is backed** — funds sit in escrow on-chain; nothing exists as an unbacked promise. * **Partial fills accumulate** on your order, claimable with your deposit. * **Expired orders return everything** — deposit plus proceeds — automatically claimable. * **One price per block** — no race to the front of the queue, no sandwich games. Hearth doesn't ask you to trust a venue. It asks you to trade on one — and then pays you for being part of it. *** **Continue reading:** [mint ΗΞΔŦ](/features/heat/mint-heat) · [ΗΞΔŦ Certificates of Deposit](/features/heat/mint-heat) · [provide liquidity, in depth](/features/hearth/providing-liquidity) · [the fee model](/features/hearth/fee-earning) · [the technology](/features/hearth/README) This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.