NFT Public Mint Sniper
A command-line tool for sniping public NFT mints on OpenSea's SeaDrop, across
Ethereum, Base and Robinhood Chain.
It builds the mint transaction from on-chain data only - price, fee recipient
and per-wallet limit all come straight from the SeaDrop contract. That means:
- No OpenSea account, login, or access token.
- No API rate limits to lose a mint to.
- Faster. Every transaction is signed and serialised before the stage opens,
so at the exact start time the only work left is writing bytes to the network.
Multi-wallet: paste as many keys as you like and they all fire in parallel.
Requirements
- Node.js 18 or newer — check with
node --version. Get it from
nodejs.org if you don't have it.
- A wallet with some ETH on the chain you're minting on.
Step 1 — Install
Run these one line at a time, pressing Enter after each:
git clone https://github.com/morsyxbt/nft-public-mint.git
cd nft-public-mint
npm install
npm run build
Before running npm install, check your prompt ends in nft-public-mint — if the
cd didn't take, everything after it fails.
Then confirm the build worked:
npm start -- --help
Install errors
Set-Location : A positional parameter cannot be found (Windows PowerShell)
Two commands got pasted onto one line — you'll see something like
cd nft-public-mintnpm install. Run each line separately.
Could not read package.json / Missing script: build
You're in the wrong folder. Run cd nft-public-mint first.
npm or git is not recognised
Install Node.js 18+ and Git,
then reopen your terminal.
cp .env.example .env
Open .env and add a private RPC URL for the chain you'll mint on, e.g.:
RPC_URL_BASE=https://base-mainnet.g.alchemy.com/v2/YOUR_KEY
A free Alchemy key takes two minutes and is the single
biggest factor in whether you win a contested mint. You can also paste it at the
prompt instead — the tool works without any .env at all, falling back to public
nodes.
Never put private keys in .env. You paste them into the CLI at run time.
They're held in memory for that run only and never written to disk.
Step 3 — Run it
npm start
The wizard asks you seven things:
| Step |
What it wants |
| 1. Private keys |
Paste one per line, hidden as you type. Blank line to finish. Each key is confirmed back to you by its wallet address, so you can check you pasted the right one. |
| 2. Chain |
Ethereum, Base, or Robinhood. |
| 3. Quantity |
How many NFTs per wallet. |
| 4. NFT link |
An OpenSea collection link, an item link, a slug, or the raw 0x contract address. A contract address or item link always works with no API key; a collection slug needs a lookup that usually works unauthenticated. |
| 5. RPC |
Paste a full URL, or just your Alchemy key and it expands automatically. Blank uses .env, or public nodes. |
| 6. Gas |
Ceiling and tip. The live base fee is shown right above the prompt. |
| 7. Timing |
Wait for the stage to open, or fire now if it's already live. |
Then it shows a summary and asks Fire?. Nothing is sent until you type y.
Step 4 — Set it and walk away
If the drop opens later, choose "Wait for the stage". It pre-signs everything,
holds, and fires at the exact start time — no supervision needed. The Fire?
confirmation comes before the wait, so there's no second prompt at mint time.
Two things to get right if you're leaving it running:
- Stop your computer from sleeping. A sleeping machine suspends the process
and the countdown freezes.
- Leave the terminal window open. Closing it kills the run.
Understanding gas
Three different numbers, and mixing them up is the most common way to lose a mint:
| Term |
What it is |
Who sets it |
| Base fee |
The network's price. Burned. |
The chain |
| Priority fee (tip) |
Paid on top, to the block producer |
You |
| Max fee |
The ceiling you'll tolerate |
You |
You pay base fee + tip. The max fee is only a cap — if the base fee is
0.006 gwei and your tip is 0.05, you pay 0.056 gwei no matter whether your
ceiling is 2 or 200.
But the ceiling is not free. Before a node will even accept your transaction,
it checks that your wallet holds gasLimit × maxFee + mint price. So a high
ceiling with a thin wallet gets rejected outright, even though the real cost is
tiny. The tool checks this before firing and tells you the highest ceiling your
balance can support.
A SeaDrop mint uses roughly 135,000 gas for quantity 1.
What it protects you from
Each of these is checked before anything is broadcast:
- Ceiling below the base fee — rejected by every node. Can't be entered.
- Tip above the ceiling — invalid under EIP-1559. Can't be entered.
- Wallet can't cover the upfront reservation — refuses to fire and tells you
the ceiling you can afford.
- Firing before the stage opens — SeaDrop reverts with
NotActive and burns
gas. "Fire now" isn't offered when the stage opens later.
- Wrong network — every RPC is checked for its chain ID; any on the wrong
chain is dropped rather than blasted at.
- Quantity above the per-wallet cap — warned before you fire.
If a transaction is rejected by every endpoint, it says so plainly instead of
waiting for a receipt that will never exist.
Supported chains
| Chain |
Chain ID |
Explorer |
| Ethereum |
1 |
etherscan.io |
| Base |
8453 |
basescan.org |
| Robinhood Chain |
4663 |
robinhoodchain.blockscout.com |
To add another, append one entry to src/chains.ts — no other
code changes needed.
Security
- Private keys are pasted at run time, kept in memory, and never written to
disk or transmitted anywhere except as a locally-signed transaction.
.env, wallets/ and *.key are all git-ignored.- Use dedicated hot wallets funded with only what you intend to spend.
- Read
src/local-mint.ts if you want to verify exactly what
gets signed and sent — it's about 150 lines.
Allowlist / FCFS mints
Not supported here, and it isn't an oversight. An allowlist stage uses SeaDrop's
mintSigned(), which needs a signature that OpenSea generates per wallet — that
genuinely requires an authenticated OpenSea session. There's no way to build it
from on-chain data, which is the whole premise of this tool.
License
MIT
它是一个 CLI 工具，用于在 Ethereum、Base 和 Robinhood Chain 上狙击 OpenSea 的 SeaDrop 合约中的公开 NFT 铸造，专为在铸造阶段开放的瞬间出手而打造。