Solana’s Bonding Curve
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The Solana Bonding Curve, also known as the SPAR curve, is a novel asset creation protocol introduced by Solana Labs. It allows for the efficient and secure creation of new assets by leveraging the power of bonding curves. In this article, we’ll explore example smart contracts that you can use as a starting point to create your own bonding curve on Solana.
What is the Bonding Curve?
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The Bonding Curve is a type of liquidity protocol used in DeFi applications, including Solana’s Inter-Block Transactions (IBTs). It enables the creation of new assets by combining existing assets through a series of liquidity swaps. The Bonding Curve is based on the idea of “bonding” two or more assets together to create a new asset that has different properties than either of the original assets.
Example Smart Contract for Solana Bonding Curve
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One of the most well-known examples of the Solana Bonding Curve is the SPL token-swap contract, which allows users to swap their SPARK (SPL’s native token) for SLP (Solana Token). This contract utilizes the Bonding Curve to facilitate efficient asset creation and management.
Here’s an example code snippet in Solidity:
pragma solidity ^0.8.0;
contract SPLBondingCurve {
// Define the assets being bonded together
address public SPARK;
address public SLP;
// Define the bonding parameters
uint256 public bondLength; // Number of periods to wait before unbonding
uint256 public minPrice; // Minimum price for unbinding
uint256 public maxPrice; // Maximum price for unbinding
uint256 public reserve1; // Reserve 1
uint256 public reserve2; // Reserve 2
// Initialize the contracts with a specific asset
constructor(address _SPARK, address _SLP) {
SPARK = _SPARK;
SLP = _SLP;
// Set the bonding parameters to default values
bondLength = 10; // Wait for 10 periods before unbinding
minPrice = 1; // Minimum price for unbinding: $1
maxPrice = 1000; // Maximum price for unbinding: $1000
reserve1 = 50; // Reserve 1
reserve2 = 50; // Reserve 2
}
// Unbond a period of length bondLength
function unbind() public {
// Get the current prices of SPARK and SLP
uint256 priceSPARK = SPARK.getPrice();
uint256 priceSLP = SLP.get_price();
// Check if we can unbond with sufficient capital
require(priceSLP > minPrice && priceSLP < maxPrice, "Unbonding failed");
// Update the reserves and prices
reserve1 -= priceSPARK;
reserve2 -= priceSLP;
// Calculate the new prices of SPARK and SLP
uint256 newSPARKPrice = priceSPARK * (priceSLP / (priceSLP + reserve1));
uint256 newSLPPrice = priceSLP * (priceSPARK / (priceSPARK + reserve2));
// Update the prices and reserves
SPARK.updatePrice(newSPARKPrice);
SLP.update_price(newSLPPrice);
// Check if we've unbound successfully
require(reserve1 > 0 && reserve2 > 0, "Unbonding failed");
}
}
This contract uses the Bonding Curve to create a new asset called SPARKL (SPL’s native token) with different properties than SPARK and SLP. The unbind function is used to unbind the period of length bondLength, which allows the creation of new assets.
Tips for Creating Your Own Bonding Curve
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- Choose suitable bonding parameters: Select values that make sense for your use case and ensure that you can unbind with sufficient capital.
- Use a reliable liquidity provider
: Ensure that your liquidity provider is trustworthy and will return high prices to unbound the period.
- Monitor and adapt
: Continuously monitor the prices of your assets and adjust the bonding parameters as needed.
