Purchase a Policy

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Purchase a Policy
The protocol automatically determines the premium or policy fees by taking numerous aspects such as policy term/cover duration, adverse selection, sum insured, utilization ratio, total pool balance, reassurance pool, etc into account.
The policy fee is determined by the supply and demand in the cover market. A pool with a low utilization ratio charges much less than one with a high utilization ratio. A pool with a high utilization ratio costs higher fees, which makes it more enticing and lucrative for liquidity providers to contribute more cash, lowering the price gradually. 
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Equation:
The policy fee denoted PFP_FPF​
 is given by the equation
x:x<C∩x>Fx=CA+ct+(IP∗IR)PF=CD100+xx : x < C  \cap x > F 
\\
x = \frac{C_A+c}{t+(I_P*I_R)}
\\

P_F = \frac{C_D}{100} + x

x:x<C∩x>Fx=t+(IP​∗IR​)CA​+c​PF​=100CD​​+x
where the value of x is always between constantsFFF
and CCC
, ccc
 is the cover commitment amount, ttt
 is the total balance of the pool, CDC_DCD​
 is the policy duration desired, CAC_ACA​
 is the desired cover amount, IPI_PIP​
 is incident support pool amount for the cover pool , IRI_RIR​
 is incident support pool capitalization ratio.
For simplicity, this equation can also be written as:
PF=(CD/100)+(CA+c)/(t+(IP∗IR)){P_F=(C_D/100) + (C_A+c)/(t+(I_P*I_R))}PF​=(CD​/100)+(CA​+c)/(t+(IP​∗IR​))
Check the following page to calculate cover fees:
​https://calculator.npm.claims​
Get Fees
import { ChainId, policy, registry, utils } from '@neptunemutual/sdk'
import { info } from '../configs/info.js'
import { getProvider } from '../provider.js'
import { weiAsPercent, parseUnits, unitsAsDollars, formatPercent, toFraction } from '../bn.js'
​
const get = async () => {
  try {
    const { key: coverKey } = info
    const productKey = utils.keyUtil.toBytes32('')
    const provider = getProvider()
​
    const dai = await registry.Stablecoin.getInstance(ChainId.Mumbai, provider)
    const daiDecimals = await dai.decimals()
​
    const args = {
      duration: 2,
      amount: parseUnits(500, daiDecimals)
    }
​
    console.info('Getting %s cover for %d months', unitsAsDollars(args.amount, daiDecimals), args.duration)
    console.info('--------------------------------------')
​
    const response = await policy.getCoverFee(ChainId.Mumbai, coverKey, productKey, args, provider)
    const {
      fee,
      utilizationRatio,
      totalAvailableLiquidity,
      rate
    } = response.result
​
    console.info('Rate: %s', formatPercent(toFraction(rate.toString())))
    console.info('Fee: %s', unitsAsDollars(fee, daiDecimals))
    console.info('--------------------------------------')
    console.info('Utilization Ratio: %s', weiAsPercent(utilizationRatio))
    console.info('Total Available Liquidity: %s', unitsAsDollars(totalAvailableLiquidity, daiDecimals))
    // console.info('Cover Ratio: %s', weiAsPercent(coverRatio))
  } catch (error) {
    console.error(error)
    console.info('Try adding more liquidity --> `3.\\ add-liquidity.js`')
  }
}
​
get()
​
/*****************************************************************************
[info] Getting US$500.00 cover for 1 months
[info] --------------------------------------
[info] Rate: 8.00%
[info] Fee: US$3.07
[info] --------------------------------------
[info] Utilization Ratio: 0.00%
[info] Total Available Liquidity: US$4,076,840.42
*****************************************************************************/
Result Type
Property
Type
Description
fee
number
The amount required in DAI to purchase the policy for the specified amount. 
utilizationRatio
number
Utilization Ratio = Total Commitment / Total Liquidity
totalAvailableLiquidity
number
Total Available Liquidity = Total Liquidity - Total Commitment + Amount in NPM Provision + Weighted Amount in Assurance Pool 
floor
number
The base policy floor rate
ceiling
number
The base policy ceiling rate
rate
number
The annualized percentage required to purchase this policy for the specified amount
Purchase Policy
import { ChainId, policy, registry, utils } from '@neptunemutual/sdk'
import { info } from '../configs/info.js'
import { getProvider } from '../provider.js'
import { parseUnits } from '../bn.js'
​
const purcahse = async () => {
  try {
    const { key } = info
    const provider = getProvider()
​
    const dai = await registry.Stablecoin.getInstance(ChainId.Mumbai, provider)
    const daiDecimals = await dai.decimals()
​
    const args = {
      duration: 2,
      amount: parseUnits(200, daiDecimals), // <-- Amount to Cover (In DAI)
      referralCode: utils.keyUtil.toBytes32(''),
      onBehalfOf: provider.address
    }
​
    // First approve the Policy contract to spend your DAI or BUSD
    let response = await policy.approve(ChainId.Mumbai, { }, provider)
    await response.result.wait()
​
    response = await policy.purchaseCover(ChainId.Mumbai, key, utils.keyUtil.toBytes32(''), args, provider)
    await response.result.wait()
    console.info(response)
  } catch (error) {
    console.error(error)
  }
}
​
purcahse()
​
/*****************************************************************************
[info] {
  status: 'Success',
  result: {
    type: 2,
    chainId: 80001,
    nonce: 16,
    maxPriorityFeePerGas: BigNumber { _hex: '0x0fa4b452d0', _isBigNumber: true },
    maxFeePerGas: BigNumber { _hex: '0x0fa4b452d0', _isBigNumber: true },
    gasPrice: null,
    gasLimit: BigNumber { _hex: '0x09c943', _isBigNumber: true },
    to: '0x23099F06e9ABbeE01597F422CDBb9c232D581626',
    value: BigNumber { _hex: '0x00', _isBigNumber: true },
    data: '0x82bdf3bd0000000000000000000000002dac3776b9f4243df6445515ebe6f6cd003b3681616e696d617465642d6272616e6473000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000bebc2000000000000000000000000000000000000000000000000000000000000000000',
    accessList: [],
    hash: '0x0402cec1b8fce955bca22c83e1fea5d2c74d711f1ea7fb111c35cce9082e2692',
    v: 0,
    r: '0x81f18c2a43f4f509d4ef3aeebc3f28143910292b53ecced7625256a86b746b87',
    s: '0x04d826825bf61048523b22289c1795eb92353414ed9c8a35acd820740d172b17',
    from: '0x2DAc3776B9f4243DF6445515eBE6F6Cd003B3681',
    confirmations: 0,
    wait: [Function (anonymous)]
  }
}
*****************************************************************************/
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Purchase Policy