Skip to main content
DEX on Optimism. Solidly-fork with ve(3,3) tokenomics, supporting both stable (correlated assets) and volatile (uncorrelated assets) pool types.

​
What it offers

  • swap: Swap tokens with route-based routing specifying stable or volatile pool type
  • addLiquidity: Add liquidity to a stable or volatile pool
  • removeLiquidity: Remove liquidity from a stable or volatile pool

​
Notes

  • Two pool types: stable=true for correlated assets (uses Curve-like invariant), stable=false for uncorrelated (uses x*y=k)
  • Fees: volatile pools typically 0.3%, stable pools typically 0.04% (set by governance)
  • ve(3,3) model: VELO holders vote-lock tokens to direct gauge emissions to pools weekly
  • Routes include both stable flag and factory address per hop
  • Optimism-only deployment; Aerodrome is the Base equivalent (same interface)
  • LP tokens can be staked in gauges for VELO emissions

​
Its names in a program

On Optimism, Velodrome is a namespace: its contracts need no import.

​
Deployments

​
ABI

Where a line says what an address it returns is, a program that calls the function through its namespace calls that contract’s methods on the result directly: <Namespace>.<Contract>.<function>(...).<method>(...). A token’s methods are the ERC-20 functions, and its writes are SafeERC20.

​
VelodromePoolABI

import VelodromePoolABI from "./protocols/velodrome/VelodromePoolABI.json";
  • getReserves() view returns (uint256 _reserve0, uint256 _reserve1, uint256 _blockTimestampLast)
  • getAmountOut(uint256 amountIn, address tokenIn) view returns (uint256)
  • stable() view returns (bool)
  • token0() view returns (address): the address is a token
  • token1() view returns (address): the address is a token
  • swap(uint256 amount0Out, uint256 amount1Out, address to, bytes data)

​
VelodromePoolFactoryABI

import VelodromePoolFactoryABI from "./protocols/velodrome/VelodromePoolFactoryABI.json"; Speaks for: poolFactory.
  • getPool(address tokenA, address tokenB, bool stable) view returns (address pool): the address is a Velodrome.Pool

​
VelodromeRouterABI

import VelodromeRouterABI from "./protocols/velodrome/VelodromeRouterABI.json"; Speaks for: routerV2.
  • swapExactTokensForTokens(uint256 amountIn, uint256 amountOutMin, (address from, address to, bool stable, address factory)[] routes, address to, uint256 deadline) returns (uint256[] amounts)
  • addLiquidity(address tokenA, address tokenB, bool stable, uint256 amountADesired, uint256 amountBDesired, uint256 amountAMin, uint256 amountBMin, address to, uint256 deadline) returns (uint256 amountA, uint256 amountB, uint256 liquidity)
  • removeLiquidity(address tokenA, address tokenB, bool stable, uint256 liquidity, uint256 amountAMin, uint256 amountBMin, address to, uint256 deadline) returns (uint256 amountA, uint256 amountB)

​
Next steps