studio

Build a weir

A launch config bundles the rules a launch runs: a creator fee, burns, and either the built-in rules kit or a hook you wrote. Make it once, and anyone can launch from it. Set it up on the left and copy the code on the right. Need the hook interface? It's in the sdk docs.

compose

what are you making?

label

creator fee

burn · buys

burn · sells

hook flags · 65before_transferanswer before every transferafter_transferrun once the amount has landedbefore_mintanswer before a mintafter_mintrun after a mintbefore_burnanswer before a burnafter_burnrun after a burntransfer_returns_deltaallowed to take cuts from the amountwrites_hook_dataallowed to write the 64 B per holding

Holder rewards, max wallet and locks come from the built-in rules kit, so they can't be combined with a hook of your own. Burn and the creator fee can.

list it on the marketplace

create-config.ts

import { buildCreateConfig, NO_LAUNCH_RULES } from '@weirs/sdk';
import { TOKEN_HOOK_FLAGS as F } from '@weirs/shared';
import { PublicKey } from '@solana/web3.js';

// your hook, deployed and made immutable first:
// solana program set-upgrade-authority <HOOK> --final
const myHook = new PublicKey('<HOOK_PROGRAM_ID>');

const made = buildCreateConfig(me, {
  rules: { ...NO_LAUNCH_RULES, burnSellBps: 25 },
  creatorFeeBps: 100,
  customHook: myHook,
  customHookFlags: F.BEFORE_TRANSFER | F.TRANSFER_RETURNS_DELTA, // = 65
  label: 'my-weir',
});

// sign with `me` and `made.keypair`, send `made.instruction`,
// then paste made.address into weirs.fun/launch → bring-your-own

before you ship a hook

Make it immutable. A config naming an upgradeable hook is refused on chain.
Prepare its account registry for the mint the launch page shows you.
It runs on every transfer, so keep it cheap in compute units.
Tokens with your hook carry a custom · unverified label. Publish the source.