> ## Documentation Index > Fetch the complete documentation index at: https://docs.dollhouse.markets/llms.txt > Use this file to discover all available pages before exploring further. # The chain ## One line of paired coins Dollhouse has one chain. Every coin in it is paired with the coin before it, called its parent. The newest coin is the head coin, and each round, a timed contest between new coins, adds the next coin below it. ```text theme={null} (ETH) → $DOLL → #1 → #2 → #3 → #4 → ... ``` Coin #3's pool holds #2, #2's pool holds #1, and #1's pool holds \$DOLL. Every Dollhouse pool is priced in \$DOLL or a chain coin. The chain starts at link one, the pool between \$DOLL and coin #1. A coin's price is quoted in its parent. When a coin's price moves, traders who buy in one pool carry that move up to every coin above it. A coin that wins its round joins the chain and gets a numbered spot. Its number and parent are written on-chain once and stay fixed for good. While it is the head, the candidate coins entered in the next round are priced in it. From then on, it earns a part of the chain share on every coin launched after it. ## Buy-side liquidity from every pool Every pool keeps 0.075% of each trade, in the coin that pool is priced in. That money becomes single-sided [buy liquidity](/the-flywheel) just under the chain coin priced in that same coin. For a coin in the chain, that is its own pool. So the more a coin trades, the more buying sits under it. Candidates in a round are all priced in the head coin. Their 0.075% goes under whichever coin wins that round. Buy liquidity is placed in portions over several days. When sellers fill it, the coins it buys stay locked in the pool too, so everything placed there stays for good. ## The chain share The chain share is 40% of the 1% fee, and all of it becomes buy liquidity. Half of it goes under every earlier coin, from \$DOLL down to the traded coin's parent. Earlier coins share it unevenly, and \$DOLL always gets about twice the newest coin's part. The other half goes under the traded coin's parent. During a round, every candidate's parent is the head coin. So trading candidates builds buy liquidity under the head. Each coin's part becomes buy liquidity in that coin's own pool, just under its price. A round's part always goes to the coin that won that round. ## The numbers | What | Value | Where | | -------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------- | | Fee on the \$DOLL side of link one | 1% (`PROTOCOL_FEE_PPM` = 10,000 ppm), on buys and sells, charged once per route | FamilyHook | | Fee each pool keeps | 0.075% (`hopFeePpm` = 750 ppm), in the coin the pool is priced in | FamilyHook | | How the 1% fee is divided | Creator 40% (`CREATOR_BPS` = 4,000), chain 40% (20% under earlier coins, 20% under the parent: `ANCESTOR_BPS` = `REINFORCE_BPS` = 5,000 of the chain part), developer 20% (`DEV_BPS` = 2,000) | FeeVault | | Creator share during and after a round | During a round, half to the candidate's creator and half to the head coin's creator; after the round, all to the coin's creator | FeeVault | | How the earlier-coins part is shared | By position, weight w(r) = 2 − 5r + 4r², where r runs from 0 (\$DOLL) to 1 (the newest earlier coin), so \$DOLL always gets twice the newest earlier coin's weight | FeeVault, FenwickRangeAdd | | Where buy liquidity is placed | Just under the current price, in a range 10 tick spacings wide (600 ticks, about 6%); the amount is valued at the lowest of the current price, the 30-minute average and the 7-day average, and a placement needs the price within 3% of the 30-minute average (`TWAP_BAND_BPS` = 300) | BidDeployer | | Pacing | At most 10% of what is waiting per rolling 24 hours (`DAILY_DRAW_BPS` = 1,000); a single placement at most 2% of the pool's depth near the price (`MAX_RESERVE_BPS` = 200) | FeeVault, BidDeployer | | Placement reward | 1% of each placement to whoever places it (`BOUNTY_BPS` = 100), with a minimum set at deployment for coins further down the chain | BidDeployer | | Liquidity stays in the pool for good | The Locker only adds liquidity | Locker | | Supply and sale curve | 1,000,000,000 per coin (1e9 × 1e18 units), all placed in the pool at launch. The curve sells 20% / 25% / 35% / 20% of supply over four bands of total value, measured against the parent's supply: 0.001× to 0.01×, 0.01× to 0.1×, 0.1× to 1×, and 1× to 100× | FamilyToken, FamilyFactory, Locker | | Snipe tax on a new pool | 99% in the first second, then 66.3% and 33.7%, zero from the third second on (`SNIPE_START_PPM` = 990,000, `SNIPE_S` = 3); during those seconds the snipe tax takes the place of the 1% fee | FamilyHook | | Round length | 15 minutes for rounds 1–2, doubling every two rounds, 12 hours from round 13 on. Registration is one fifth of the round, from 3 minutes to 1 hour. Once rounds are 1 hour or longer, new coins can also enter during the first third of trading | RoundManager | | Round end | A random moment in the last 3 minutes before the planned end (`RANDOM_END_S` = 180), drawn from the drand beacon; a 5-minute score window after it (`SUBMIT_S` = 300); if the beacon takes longer than 30 minutes, the round ends at the planned end (`END_TIMEOUT` = 30 min) | RoundManager, DrandSource | | Winning | Highest average net buying over the closing 15 minutes (`CLOSING_WINDOW_S` = 15 min); the highest average wins in this deployment (`H_FRAC_WAD` = `H_MIN_FRAC_WAD` = 0) | RoundManager | | Bond | A flat amount in \$DOLL set at deployment (`BOND_BASE` = `BOND_MAX`), refunded to the winner and forfeited by the other candidates into link one's buy liquidity | RoundManager | | Admin | The steward's only powers are announcing a sunset (7-day delay, cancellable once) and handing its role on (7-day delay, `ROLE_TRANSFER_DELAY`); the developer address moves on the same 7-day delay. Trading runs on the contracts alone, open to every address, and every coin's supply is fixed at launch | RoundManager, FeeVault |