提供 CPMM 流动性 - Powfi Docs

创建带初始流动性的池

首次存入决定价格。例如，存入 1,000 ALPH 和 50 USDT，价格即为 1 ALPH = 0.05 USDT。

const exists = await powfi.cpmm.poolExists(alph, usdt)

if (!exists) {
  // preview: LP minted = sqrt(a*b) - 1000
  const preview = CpmmModule.computeLiquidityAmounts({
    tokenAId: alph,
    tokenBId: usdt,
    amountA: 1_000n * 10n ** 18n,
    amountB: 50n * 10n ** 6n
  })

  const { poolId, result } = await powfi.cpmm.createPool({
    tokenAId: alph,
    tokenBId: usdt,
    sender: address,
    initialLiquidity: { tokenAAmount: preview.amountA, tokenBAmount: preview.amountB }
  })
}

创建代币对需要支付 1 ALPH 的合约押金。

向已有的池添加流动性

让用户输入一侧的数量，根据储备量推导另一侧：

const pool = await powfi.cpmm.getPoolState(alph, usdt)

const q = CpmmModule.computeLiquidityAmounts({
  poolState: pool,
  tokenAId: alph,
  tokenBId: usdt,
  amountA: 200n * 10n ** 18n,
  inputType: 'TokenA'
})
// q.amountB     -> USDT needed
// q.shareAmount -> LP tokens you'll receive
// q.sharePercentage -> your % of the pool after deposit

await powfi.cpmm.addLiquidity({
  poolState: pool,
  tokenAId: alph,
  tokenBId: usdt,
  amountA: q.amountA,
  amountB: q.amountB,
  slippageBps: 50n,
  sender: address
})

读取头寸

LP 代币是普通的同质化代币，其 ID 就是池 ID：

const lpTokenId = powfi.cpmm.getPoolId(alph, usdt)
const bal = await powfi.nodeProvider.addresses.getAddressesAddressBalance(address)
const lpBalance = BigInt(bal.tokenBalances?.find((t) => t.id === lpTokenId)?.amount ?? '0')

const { token0, amount0, token1, amount1 } = await powfi.cpmm.computeClaimableAmounts(alph, usdt, lpBalance)

移除流动性

const pool = await powfi.cpmm.getPoolState(alph, usdt)
const burn = lpBalance / 2n // withdraw 50%

const preview = CpmmModule.computeRemoveLiquidityAmounts(pool, lpBalance, burn)
// preview.amount0 / amount1 -> tokens you receive
// preview.remainSharePercentage

await powfi.cpmm.removeLiquidity({
  poolState: pool,
  liquidity: burn,
  totalLiquidityAmount: lpBalance,
  slippageBps: 50n,
  sender: address
})