What is a bonding curve? Meme coin pricing explained
5 min read · Updated October 26, 2026
A bonding curve is a price formula written into a smart contract. Instead of waiting for someone to put up liquidity, the contract itself sells the coin: every buy pushes the price up a little, every sell pushes it down. It is the engine behind many meme coin launchpads, including pump.fun.
How the price moves
The most common design uses two virtual reserves, one of money (such as SOL, ETH or USDC) and one of the coin, whose product stays constant. When you buy, money goes into the reserve and coins come out, so the next coin costs a little more. When you sell, the opposite happens. The formula is public and the same for everyone, so the price at any moment follows directly from how much has been bought and sold. You can try it in the bonding curve simulator.
- Early buyers pay less per coin than later buyers.
- Big buys move the price more than small ones. See price impact vs slippage.
- The price you see is the price you get, minus the fee and any movement while your transaction lands.
Why you can usually sell back
Because the curve holds all the money that buyers paid in, it can pay out a seller according to the same formula. There is no order book that can run dry. On a well-built curve launchpad this is guaranteed by the contract: until graduation, anyone can sell back at any time.
What graduation means
A curve is a starting point, not a permanent home. Once a set amount of money has gone in, the coin graduates: the money in the curve and a matching amount of coins become a regular liquidity pool on a decentralized exchange, at the same price the curve reached. Good launchpads lock or burn that pool's liquidity so it can never be removed.
Fees
Every buy and sell on a curve pays a small fee, often around 1% on the large launchpads. Some platforms share part of it with the coin's creator, and many keep charging a fee in the pool after graduation.
Launching without a bonding curve
A curve is not the only way to start a coin. On sasa there is no curve and no graduation target. Each coin launches on Base, BNB Chain, Robinhood Chain and Arc at once, straight into real DEX pools with each chain's pool starting at a market cap of about $3,000, so DexScreener, GMGN and trading bots see it from the first second. After five minutes the chain holding the most money wins, the other pools' money moves into the winner, and the winning pool is locked forever. Every race ends with a winner, so there is no coin stuck short of a target. Pump.fun vs Clanker vs launch races compares the models side by side.
Questions
Is a bonding curve safe?
The formula itself is simple and transparent. What matters is the contract around it: a fixed supply, no owner who can take the funds, and a guaranteed sell-back until graduation.
Why does my buy get fewer coins than the quote said?
If others buy just before you, the price moves. A slippage limit cancels the trade if the price moves more than you allowed. See what is slippage.
What happens to my coins at graduation?
On a curve launchpad nothing changes for holders: your coins stay in your wallet and now trade in the pool instead of on the curve.
Does sasa use a bonding curve?
No. sasa coins trade in real DEX pools from the first second, and a 5-minute race decides which chain's pool becomes the coin's permanent, locked home.