Coins quoted in other coins.

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

const b64 = (bytes: Uint8Array) => btoa(String.fromCharCode(...bytes))
const fromB64 = (s: string) => Uint8Array.from(atob(s), (c) => c.charCodeAt(0))

export async function launchChild(wallet: Wallet, image: File) {
  // 1. Prepare: the server pins metadata and builds the create transaction.
  const form = new FormData()
  form.append('image', image)
  form.append(
    'data',
    JSON.stringify({
      launcher: wallet.publicKey.toBase58(),
      name: 'Grandchild',
      symbol: 'GRAND',
      description: 'Quoted in its parent, not SOL.',
      parent: '2yPZk2wkw16r1BvDRSqKfqyKQumeCvs9EdUNRetNpump', // omit for a SOL root
      devBuy: '1000', // optional, in the parent coin
    }),
  )
  const prepared = await fetch('https://www.chainpad.tech/api/launch/prepare', { method: 'POST', body: form })
    .then((r) => r.json())
  if (prepared.error) throw new Error(prepared.error)

  // 2. Sign: one signature from the launcher. The mint key is already on it.
  const tx = VersionedTransaction.deserialize(fromB64(prepared.tx))
  const signed = await wallet.signTransaction(tx)

  // 3. Confirm: the server checks it is the exact transaction it built, then sends it.
  const done = await fetch('https://www.chainpad.tech/api/launch/confirm', {
    method: 'POST',
    headers: { 'content-type': 'application/json' },
    body: JSON.stringify({ mint: prepared.mint, tx: b64(signed.serialize()) }),
  }).then((r) => r.json())
  if (done.error) throw new Error(done.error)

  return { mint: done.mint, signature: done.signature, generation: prepared.depth }
}

# Live trades on coins launched here
curl https://www.chainpad.tech/api/feed

# Children and grandchildren of a coin
curl https://www.chainpad.tech/api/coin/<mint>/tree

# Candles: 1m 5m 15m 1h 4h 1d
curl "https://www.chainpad.tech/api/coin/<mint>/candles?tf=15m"

# Search coins launched here by name, ticker or mint
curl "https://www.chainpad.tech/api/search?q=grand"

{ "error": "That chain is already as deep as pump.fun allows." }