Solana: Example contract code for a bonding curve?

Solana Bonding Curve

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Solana Bonding Curve, also known as SPAR Curve, is a new 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 explore smart contract examples that you can use as a starting point to build your own Solana Bonding Curve.

What is a Bonding Curve?

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A Bonding Curve is a type of liquidity protocol used in DeFi applications, including Solana Inter-Block Transactions (IBT). It allows for the creation of new assets by combining existing assets through liquidity swaps. A Bonding Curve is based on the idea of “combining” two or more assets to create a new asset with different properties than the original asset.

Solana Bonding Curve Smart Contract Example

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One of the most well-known examples of Solana Bonding Curve is the SPL token swap contract, which allows users to exchange their SPARK (SPL’s native token) for SLP (Solana token). This contract uses the Bonding Curve to efficiently create and manage assets.

Here is an example of a Solidity code snippet:


pragma solidity ^0.8.0;
contract SPLBondingCurve {
// Define the resources to be bonded
address public SPARK;
address public SLP;
// Define the bonding parameters
uint256 public bondLength; // Number of times to wait before unbonding
uint256 public minPrice; // Minimum price to unbind
uint256 public maxPrice; // Maximum price for unbinding
uint256 public reserve1; // Reserve 1
uint256 public reserve2; // Reserve 2
// Initialize contracts with a specific asset
constructor(address _SPARK, address _SLP) {
SPARK = _KIBRA;
SLP = _SLP;
// Set binding parameters to default values
linkLength = 10; // Wait 10 periods before unbinding
minPrice = 1; // Minimum unbinding price: 1 USD
maxPrice = 1000; // Maximum unbinding price: 1000 USD
reserve1 = 50; // Reserve 1
reserve2 = 50; // Reserve 2
}
// Unbind the bond period Length
function unbind() public {
// Get current prices from SPARK and SLP
uint256 priceSPARK = SPARK.getPrice();
uint256 priceSLP = SLP.get_price();
// Check if we can fulfill the commitment with enough capital
request(priceSLP > minPrice && priceSLP < maxPrice, "Resolve failed");
// Update reserves and prices
reserve1 -= priceSPARK;
reserve2 -= priceSLP;
// Calculate new SPARK and SLP prices
uint256 newSPARKPein = priceSPARK * (priceSLP / (priceSLP + reserve1));
uint256 newSLPPrice = priceSLP * (priceSPARK / (priceSPARK + reserve2));
// Update prices and reserves
SPARK.updatePrice(newSPARKPrice);
SLP.update_price(newSLPPrice);
// Check if the binding was successfully removed
Require(reserve1 > 0 && reserve2 > 0, "Cancellation failed");
}
}

This contract uses a bond curve to create a new asset called SPARKL (SPL local access key) with different properties from SPARK and SLP. The “unbind” function is used to unbind a period using the length bondLength, allowing for the creation of new assets.

Tips for creating your own retention curve

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