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Overview

New tokens launch on a bonding curve — a mathematical formula that determines price based on supply. As more tokens are bought, the price increases. As tokens are sold, the price decreases.

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The Formula

XD.fun uses a constant product formula: 
x × y = k
Where:
  • x = SOL in the pool
  • y = Tokens in the pool
  • k = Constant (never changes)

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Price Discovery

  • Buying removes tokens from the pool → price goes up
  • Selling adds tokens back to the pool → price goes down
  • Price is always determined by the ratio of SOL to tokens

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Initial State

Every token launches with:
  • 30 SOL virtual liquidity
  • 1 billion token supply
  • Starting price based on this ratio

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Why Bonding Curves?

  • Fair launch: Everyone buys at the same curve
  • No presales: First buyer gets lowest price
  • Instant liquidity: Trade immediately after creation
  • Transparent pricing: Price is always calculable

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Fees

Each trade incurs a 0.75% max fee:
  • 0.45% protocol fee
  • Up to 0.30% creator fee (max, depends on creator’s fee modifier)

Migration

Learn what happens when a token graduates from the bonding curve