SPLICE coins,
from your site.

import { VersionedTransaction } from '@solana/web3.js'

const SPLICE = 'https://splicepad.com'
const b64 = (s: string) => Uint8Array.from(atob(s), (c) => c.charCodeAt(0))
const toB64 = (u: Uint8Array) => btoa(String.fromCharCode(...u))

// 1. Prepare: SPLICE screens the image, pins metadata and builds the transactions.
const prepared = await fetch(`${SPLICE}/api/v1/launch/prepare`, {
  method: 'POST',
  headers: { 'content-type': 'application/json' },
  body: JSON.stringify({
    name: 'Moon Cat',
    symbol: 'MCAT',
    description: 'Fees burn the supply.',
    imageUrl: 'https://example.com/cat.png',
    launcher: wallet.publicKey.toBase58(),
    spec: { pkg: 'custom', creatorBps: 5000, extensions: [{ id: 'buy_burn', weight: 5000 }] },
    ref: 'my-site',
  }),
}).then((r) => r.json())

// 2. One wallet approval for every transaction, in the order given by `sign`.
const signed = await wallet.signAllTransactions(
  prepared.sign.map((k: string) => VersionedTransaction.deserialize(b64(prepared.txs[k]))),
)
const txs = Object.fromEntries(prepared.sign.map((k: string, i: number) => [k, toB64(signed[i].serialize())]))

// 3. Confirm: SPLICE checks the signed bytes match what it built, then relays them.
const coin = await fetch(`${SPLICE}/api/v1/launch/confirm`, {
  method: 'POST',
  headers: { 'content-type': 'application/json' },
  body: JSON.stringify({ mint: prepared.mint, txs }),
}).then((r) => r.json())

console.log(coin.url, coin.pumpUrl)