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Doppler is an onchain protocol for launching tokens through various price discovery auctions. Applications integrate Doppler, configure their token launch parameters, and get to market faster than building in-house smart contracts. Teams like Zora, Paragraph, and Noice use Doppler to create new tokens by configuring inputs such as supply curves, vesting schedules, inflation mechanics, governance structures, and ongoing economics, such as fees and treasury management.

Get started

npm install @whetstone-research/doppler-sdk viem

import { DopplerSDK } from '@whetstone-research/doppler-sdk';
import {
  createPublicClient,
  createWalletClient,
  http,
  parseEther
} from 'viem';
import { base } from 'viem/chains'

// 1. Set up viem clients
const publicClient = createPublicClient({
  chain: base,
  transport: http(),
});

// 2. Set up your local wallet client
const walletClient = createWalletClient({
  chain: base,
  transport: http(),
  account: '0x...', // Your wallet address
});

// 3. Initialize the SDK
const sdk = new DopplerSDK({
  publicClient,
  walletClient,
  chainId: base.id,
});

// 4. Configure a multicurve auction using market cap ranges
const WETH = '0x4200000000000000000000000000000000000006';

const params = sdk
  .buildMulticurveAuction()
  .tokenConfig({
    name: 'TEST',
    symbol: 'TEST',
    tokenURI: 'https://example.com/metadata.json'
  })
  .saleConfig({
    initialSupply: parseEther('1000000000'),
    numTokensToSell: parseEther('900000000'),
    numeraire: WETH,
  })
  .withCurves({
    numerairePrice: 3000, // ETH = $3000 USD
    curves: [
      {
        marketCap: { start: 500_000, end: 1_500_000 },
        numPositions: 10,
        shares: parseEther('0.4')
      },
      {
        marketCap: { start: 1_000_000, end: 5_000_000 },
        numPositions: 10,
        shares: parseEther('0.5')
      },
      {
        marketCap: { start: 5_000_000, end: 'max' },
        numPositions: 1,
        shares: parseEther('0.1')
      },
    ],
  })
  .withGovernance({ type: 'noOp' })
  .withMigration({ type: 'noOp' })
  .withUserAddress('0x...')
  .build()

const result = await sdk.factory.createMulticurve(params)
console.log('Pool:', result.poolId)
console.log('Token address:', result.tokenAddress)

Example configuration details

With this Doppler Multicurve Launch, we configured:

• Token config - metadata such as the name, symbol, and other relevant data like an image

• Sale config - allocations of the token and how much is available for sale

• Curves - Two price curves defined by market cap ranges (USD), each with 10 unique liquidity positions. The first curve's start market cap ($500k) sets the launch price.

• Governance & Migration - There is no governance or migration associated with this token

Next steps

Continue learning more about Doppler and follow along with other SDK examples.