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Launches happen through two entry points on the InkyPump V2 hook at 0x4cC8F6d5B7cE150CCC0A9B7664532B1283b96AC4. Use createLaunch for a plain launch. Use createLaunchWithReferral to record a referral code on chain at creation time.

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createLaunch

function createLaunch(InkyPumpTypes.CreateLaunchParams calldata params)
    external payable returns (uint256 launchId);
msg.value is the optional creator prebuy. Send 0 for no prebuy. Send any positive amount to prebuy that much ETH at the curve’s starting price in the same transaction. Returns the new launchId. The launch’s token address is in the LaunchCreated event emitted by the same call.

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createLaunchWithReferral

function createLaunchWithReferral(
    InkyPumpTypes.CreateLaunchParams calldata params,
    string calldata referralCode
) external payable returns (uint256 launchId);
Same behaviour as createLaunch, plus a Referral event recording the code: 
event Referral(uint256 indexed launchId, address indexed trader, string referralCode);
If referralCode is empty, this still works but does not emit the Referral event. Use the plain createLaunch when you do not have a referral code.

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CreateLaunchParams

struct CreateLaunchParams {
    string name;
    string ticker;
    string description;
    string imageUrl;
    string telegram;           // optional
    string twitter;            // optional
    string website;            // optional
    uint16 creatorFeeSplitBps; // 0 to 10_000
    uint32 gainBps;            // 0 to 200_000 (1x to 21x)
    uint96 targetRaise;        // 1 ether to 5 ether
    uint32 antiSnipeDuration;  // 0, 20, 40, or 60 seconds
    uint64 startTime;          // 0 for immediate, future unix timestamp for scheduled
}

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Prebuy

There is no prebuyEth field. To prebuy at launch, send the prebuy amount as msg.value on the createLaunch call. The creator’s prebuy executes in the same transaction as the launch, at the curve’s starting price, and bypasses the anti-snipe captcha gate.

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Field constraints

FieldConstraintReverts if violated
targetRaiseBetween MIN_RAISE (1 ether) and MAX_RAISE (5 ether)RaiseOutOfRange
gainBpsAt most MAX_GAIN_BPS (200,000)GainTooHigh
creatorFeeSplitBpsAt most BPS_DENOMINATOR (10,000)SplitOutOfRange
msg.value0 (no prebuy) or any positive amount your wallet can covernone directly
startTimeEither 0 or in the futureLaunchInPast

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What happens during the call

  1. The hook deploys a new ERC20 token with the supplied metadata
  2. It computes the sale supply and liquidity supply for the curve through SaleSplitCalculator(targetRaise, gainBps)
  3. It records the LaunchConfig in storage at the new launchId
  4. It emits LaunchCreated and LaunchMetadata
  5. If msg.value > 0, it executes the creator prebuy at the curve’s starting price
  6. If called as createLaunchWithReferral with a non empty code, it emits Referral

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Events emitted

event LaunchCreated(
    uint256 indexed launchId,
    address indexed creator,
    address token,
    uint96 targetRaise
);

event LaunchMetadata(
    uint256 indexed launchId,
    string name,
    string ticker,
    string description,
    string imageUrl,
    string telegram,
    string twitter,
    string website
);

event SalePortionResolved(
    uint256 indexed launchId,
    uint16 salePortionBps,
    uint256 marginalPrice,
    uint256 poolPrice
);
If msg.value > 0, a Trade event also fires for the prebuy.

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Example: minimal launch

import { encodeFunctionData, parseEther } from "viem"

const params = {
  name: "My Token",
  ticker: "MINE",
  description: "Launching on InkyPump V2",
  imageUrl: "https://example.com/logo.png",
  telegram: "",
  twitter: "",
  website: "",
  creatorFeeSplitBps: 7000,     // 70 percent of variable fee to creator
  gainBps: 50_000,              // 6x gain
  targetRaise: parseEther("3"),
  antiSnipeDuration: 40,        // 40 second captcha gate
  startTime: 0n,
}
// To prebuy, send ETH with the transaction (set `value` on the tx call below).

const data = encodeFunctionData({
  abi: INKY_PUMP_HOOK_ABI,
  functionName: "createLaunch",
  args: [params],
})

const hash = await wallet.sendTransaction({
  to: "0x4cC8F6d5B7cE150CCC0A9B7664532B1283b96AC4",
  data,
  value: 0n,
})

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Common errors

RevertCause
RaiseOutOfRangetargetRaise is below 1 ether or above 5 ether
GainTooHighgainBps exceeds 200,000
Tx out of fundsWallet does not have enough ETH for gas plus msg.value prebuy
LaunchInPaststartTime is in the past and not zero
SplitOutOfRangecreatorFeeSplitBps is above 10,000