How arb.family works.
Everything on this page is contract behaviour on Arbitrum One. The numbers are the deployed parameters, not marketing. A coin bonds against exactly one token, chosen when it was launched, and every figure with a currency on it is in that token.
Launch, curve, graduation. That is the whole lifecycle.
A name, a ticker, an optional image link, and which of the three quote tokens the coin bonds in. You pay gas in ETH, which on Arbitrum is a few cents to launch. There is no listing fee, no presale, and no allocation to the team or to us. Supply is fixed at 1,000,000,000 and the contract cannot mint more.
793,100,000 tokens sell on a constant product curve with virtual reserves, priced in whichever quote the coin chose. Every buy moves the price up the same path and every sell moves it back down. Transfers between wallets are locked while the curve is open, so nobody can open a side pool before everyone can see the coin.
When the last curve token sells, anyone can call graduate. The raise and the 206,900,000 tokens that were held back seed a Uniswap v4 pool, and the position NFT is sent to a dead address. The pool opens at exactly the final curve price, and its hook keeps charging the same fee, so the creator keeps earning.
The first 2% of the raise buys 57.5 million tokens. The last 2% buys 4.2 million.
Half of the curve supply sells for about a fifth of the raise. The other half takes the remaining four fifths. That is not a fee and it is not a trick, it is what a constant product curve does, and it is the reason to look at the shape before you buy instead of after.
First 2% of the raise
57,500,000 tokens
5.75% of total supply
Last 2% of the raise
4,200,000 tokens
0.42% of total supply
Every coin on arb.family is the same shape, whatever it is priced in. What changes is where the puck is sitting.
A coin picks what it is priced in. You can still pay in ETH.
Every coin bonds against one quote token, chosen at launch. On Arbitrum One the choices are ETH, ARB or USDC. The choice is permanent: the quote is immutable on the launchpad contract and is mined into the address of the pool hook the coin graduates into, so a quote is a separate pair of contracts rather than a setting. The board shows coins from every one of them together, and every card says which one it is.
You do not have to hold the quote token to trade. Buy a coin that bonds in something other than ETH and the app swaps into that token, buys on the curve and refunds the ETH it did not spend, all in one transaction. Selling runs the same way in reverse. Gas is ETH whichever coin you are on, so ETH in your wallet is enough for the whole site. Holding the quote token already works too, and skips the swap.
| ETH | ARB | USDC | |
|---|---|---|---|
| Graduates at | 3.5 ETH | 47,500 ARB | 8,750 USDC$8,750 today |
| Price at launch | 0.00000000115 ETH | 0.0000156 ARB | 0.00000288 USDC |
| Market cap at launch | 1.15 ETH | 15,600 ARB | 2,880 USDC |
| Market cap at graduation | 16.9 ETH | 230,000 ARB | 42,300 USDC |
| Migration fee at graduation | 0.115 ETH | 1,550 ARB | 290 USDC |
Each target is a fixed amount of its own token and not a fixed amount of value. They were sized to be worth roughly the same as each other on 6 September 2026 and they drift apart from there: if ARB halves against ETH, so does what graduating an ARB coin is worth.
Arbitrum One is an Ethereum L2 built by Offchain Labs on the Nitro stack. It has been live since 2021.
The swap that lets you pay in ETH routes through Uniswap, v4 for USDC and v3 for ARB, whichever holds the liquidity.
arb.family coins graduate straight into v4 pools against their own quote.
What happens when the curve sells out.
The last of the 793,100,000 curve tokens is bought and the coin's raise is complete. The curve stops quoting.
It is a permissionless call. The creator does not have to be online, and cannot block it. Whoever sends the transaction pays the gas.
The raise and the 206,900,000 reserved tokens seed a Uniswap v4 pool against the coin's quote token. The listing price is exactly the final curve price, so there is no gap between the last curve buy and the first pool buy.
The pool's own LP fee is zero and the position NFT is sent to a dead address. Nobody can withdraw that liquidity afterwards, including us.
Until this point tokens cannot move between wallets at all, which blocks premature pools and off curve trading. From here the coin is a normal ERC20, and the pool's hook keeps routing the same trade fee to the creator.
All five steps are contract behaviour, not policy. The contracts are unaudited.
Launch a coin, earn on every trade of it.
Every buy and sell pays a 1 percent fee, charged in whatever the coin is priced in, and 30 percent of that fee routes to the creator address on every single trade. Graduation does not end it: the Uniswap v4 pool carries a hook that keeps charging the same 1 percent on every swap, so the creator earns on the curve and then on the pool, forever. Launching costs nothing beyond gas. The creator does not receive tokens, cannot mint, and cannot change the curve after launch. The fee share is their whole upside, and it never expires.
Volume on your coin
You earn
10
0.03
100
0.3
1,000
3
Both columns are in the coin's own quote: 100 ETH of volume on an ETH coin pays you 0.3 ETH, 100 USDC of volume on a USDC coin pays you 0.3 USDC. A single 1 unit buy pays a 0.01 fee, of which 0.003 lands with the creator, claimable any time.
The whole spec on one screen.
The raise, the launch price and the market caps depend on which quote a coin bonded in, so they are in the quotes table rather than here.
Common questions.
Can the creator rug?
The creator cannot mint, cannot change the curve, and cannot pull liquidity. Transfers are locked until graduation and the LP position is burned at graduation. The creator does earn 30 percent of the 1 percent trading fee, which is the whole of their upside from the mechanism.
Can I sell before graduation?
Yes. Selling back to the curve is open the whole time the curve is, at the same shape in reverse. What is locked before graduation is moving tokens between wallets, which is what blocks premature side pools.
What happens if a coin never sells out?
Nothing is forced. The curve stays open and you can buy and sell on it for as long as you want. The tokens stay non transferable until graduation happens.
Is there a price gap when a coin lists on the DEX?
No. The pool is seeded with the raise and the 206,900,000 reserved tokens at the ratio that makes the opening pool price equal to the final curve price.
What do I need in my wallet?
ETH on Arbitrum, nothing else. It pays for gas, about a cent a trade, and it buys any coin here: on an ETH curve the app wraps it, and on an ARB or USDC curve it swaps for you inside the same transaction and refunds whatever it did not spend. Holding the quote token already works too and skips the swap. The Add funds page shows how to get ETH onto the chain.
Can a coin change what it is priced in?
No. The quote is immutable on the launchpad a coin was created on, and that launchpad's pool hook has the quote mined into its address. Changing it would not be a setting, it would be a different coin on a different pair of contracts.
I sold a coin and received WETH. What is that?
Wrapped ETH, the ERC20 form of ETH that the ETH curves settle in. It is redeemable one to one for plain ETH at any time, and the trade panel shows an unwrap button whenever your wallet holds some. Selling an ARB or USDC coin pays out that token instead, or plain ETH if you ask to be paid in ETH.
Is this mainnet?
Yes. arb.family runs on Arbitrum One. The contracts have not been audited, trade at your own risk.