A guide to paying for QSC peptide orders with cryptocurrency. QSC accepts Bitcoin (BTC) and USDT on Ethereum (ERC-20) only — processed automatically through Blockonomics.
QSC accepts two cryptocurrencies. Before you buy, understand the key differences — especially the ETH gas fee requirement for USDT payments.
Bitcoin (BTC)
USDT (ERC-20)
Price stability
Volatile — BTC price changes constantly
Stable — always ≈ $1 USD per token
Network
Bitcoin blockchain
Ethereum only (ERC-20) at QSC
Extra requirement
None — BTC is self-contained
Must also hold ETH for gas fees ($2–15)
Confirmation time
10–60 minutes
1–5 minutes
Amount to send
BTC equivalent of USD total (e.g. 0.00412 BTC)
Same as USD total (e.g. $312 = 312 USDT)
Best for
Those already holding BTC
Those who want a predictable, stable payment amount
⛽ USDT ERC-20 requires ETH for gas fees
Sending any token on the Ethereum network — including USDT — requires ETH (Ether) in the same wallet to pay the network’s transaction fee, known as “gas.” USDT itself does not cover this fee.
What to do before paying with USDT:
• Hold 0.001–0.002 ETH (roughly $2–5 at current prices) in the same wallet you’re sending USDT from
• If your ETH balance is zero or near-zero, the transaction will fail with an “insufficient gas” error
• Buy ETH on the same exchange (Coinbase, Kraken, etc.) and transfer it alongside your USDT
Exception: If you send USDT directly from a Coinbase exchange account (not Coinbase Wallet), Coinbase handles gas automatically — you will see the fee upfront before confirming.
⚠️ Wrong network = lost funds permanently
USDT exists on multiple separate blockchains. QSC accepts USDT on Ethereum (ERC-20) only. The wallet address always starts with 0x…
These will lose your funds:
• USDT/TRC-20 (Tron) sent to QSC’s Ethereum address = 💸 gone
• USDT/SPL (Solana) sent to QSC’s Ethereum address = 💸 gone
Always verify: network = Ethereum, address starts with 0x.
2. Before You Start
📱 Get a crypto exchange account or wallet
Coinbase is the easiest for beginners — US-regulated, debit card accepted, handles ETH gas automatically when sending USDT. Kraken and Gemini are solid alternatives. For privacy, self-hosted wallets like MetaMask (Ethereum/USDT) or Exodus work well — but require you to manage ETH gas yourself.
📲 Cash App — easiest BTC option for US users
Cash App (by Block, Inc.) lets you buy and send Bitcoin directly from your phone with no separate wallet needed. It is one of the fastest ways for US-based customers to pay with BTC — no exchange withdrawal delays once identity is verified. Cash App supports Bitcoin only — it cannot send USDT or any other token. See Section 3b for full steps.
⛽ For USDT: also buy ETH for gas
If paying with USDT from a self-hosted wallet (MetaMask, Exodus), you must hold ETH in the same wallet to pay Ethereum gas fees. Buy 0.001–0.002 ETH alongside your USDT. Without ETH, your USDT transaction will fail. Not needed if paying with BTC, or if sending USDT directly from Coinbase’s exchange.
📅 Plan 7+ days ahead for first-time buyers
First-time crypto purchases on regulated exchanges often trigger a 3–7 day security hold before funds can be withdrawn. Buy early — ideally a week before placing your QSC order. Bank transfers (ACH) are cheapest but slowest; debit cards are instant but cost more in fees.
💸 Fund in modest chunks
If new to crypto, try $100–200 test purchases before funding larger amounts. Some exchanges flag large first-time transfers for compliance review. Build a transaction history gradually.
🔐 Back up your wallet recovery phrase
If using a self-hosted wallet (MetaMask, Exodus), write down your 12 or 24-word recovery phrase on paper and store it offline. Lose it and your funds are gone permanently — there is no customer support reset.
🚫 Only pay via the Blockonomics checkout page
The only legitimate QSC wallet address is generated on the Blockonomics page after placing your order at qsc-usa.com. Never send crypto to an address received via email, Telegram, Reddit DM, or any other channel.
3. Step-by-Step: Paying with Bitcoin (BTC)
1 Buy Bitcoin on an exchange
Create an account on Coinbase, Kraken, or Gemini and complete identity verification (government ID required). Purchase Bitcoin via debit card (instant, higher fee ~1.5–3%) or bank transfer (3–5 day hold, lower fee).
How much to buy: The Blockonomics page shows the exact BTC amount at the live rate when you place your order. Because BTC is volatile, either wait until your order is placed to buy the precise amount, or buy slightly more as a buffer and hold the remainder.
2 Place your order at qsc-usa.com
Add items to your cart. Apply any coupon codes on the cart page before checkout (the field appears below your items — or click “Have a coupon? Click here” at the top of the checkout page). Fill in shipping details, select Bitcoin (BTC) as payment method, and click “Place order.”
3 The Blockonomics payment page loads
You are automatically redirected to a Blockonomics-hosted payment page showing:
• The exact BTC amount to send (e.g. 0.00412 BTC)
• A Bitcoin wallet address unique to your order
• A QR code to scan with your exchange app
• A countdown timer — the BTC rate is locked for a limited window
Keep this page open. It auto-updates as your transaction is detected on-chain.
4 Send the exact BTC amount
Open your exchange app. Go to Send / Withdraw Bitcoin. Paste the wallet address from Blockonomics or scan the QR code. Enter the exact BTC amount shown (not your USD total). Confirm and send.
⚠️ Triple-check before confirming:
• Wallet address matches Blockonomics exactly
• Amount is the BTC figure shown — not your USD total
• You are sending BTC, not another coin
5 Wait for blockchain confirmation
Bitcoin requires 1–3 network confirmations — typically 10–60 minutes depending on congestion. The Blockonomics page updates automatically: Waiting → Seen → Confirmed. Once confirmed, your order moves to Processing and QSC begins fulfillment within 1–3 business days.
3b. Alternative: Paying with Bitcoin via Cash App
Cash App supports Bitcoin (BTC) only. It cannot send USDT or any ERC-20 token. Use this method only if paying with BTC at checkout.
1 Download Cash App and create an account
Download Cash App from the App Store or Google Play. Open it and tap Sign Up. You will need:
• A US phone number or email address
• A debit card or linked bank account to fund purchases
• A $Cashtag (your unique Cash App username — required to complete setup)
After signing up, tap the profile icon → Personal and complete identity verification (government-issued ID + date of birth). Bitcoin withdrawals to external wallets require identity verification — do this step before you need to pay.
2 Enable Bitcoin and buy the amount you need
On the Cash App home screen, tap the Bitcoin (₿) tab at the bottom. Tap Buy and enter a dollar amount. Cash App will show you the BTC equivalent at the live rate, plus its fee (typically a small spread + service fee shown before you confirm).
How much to buy: Place your QSC order first to see the exact BTC amount on the Blockonomics page, then return to Cash App to buy that precise amount — or buy slightly more as a buffer.
• Fund via debit card: instant, but higher fee
• Fund via linked bank account (ACH): lower fee, but 1–3 business day hold before BTC can be withdrawn
First-time buyer tip: Cash App often places a hold on newly purchased BTC for up to 24–72 hours before allowing withdrawal to an external address. Plan ahead and buy your BTC at least a day before placing your order.
3 Place your order at qsc-usa.com and get the Blockonomics address
Add items to cart, apply any coupon codes on the cart page, select Bitcoin (BTC) as payment method, and click “Place order.” You will be redirected to the Blockonomics payment page showing the exact BTC amount and the destination Bitcoin wallet address. Keep this page open and visible when you go back to Cash App to send.
4 Send Bitcoin from Cash App to the Blockonomics address
In Cash App, tap the Bitcoin (₿) tab → tap Send (the paper plane icon or “Send Bitcoin”). You will be asked how to send:
• Choose “Send to a Bitcoin address” (not to a $Cashtag or phone number — those go to other Cash App users, not to external wallets)
Tap the QR code scanner icon and scan the QR code on the Blockonomics page, or paste the Bitcoin address manually. Enter the exact BTC amount shown on Blockonomics. Cash App will display a network fee — ensure your BTC balance covers both the payment amount and the fee.
⚠️ Triple-check before confirming:
• You tapped “Send to a Bitcoin address” — not $Cashtag
• The address matches the Blockonomics page exactly
• The amount is the BTC figure shown on Blockonomics — not the USD total
• You are sending on-chain, not via Lightning Network (Blockonomics uses standard on-chain BTC addresses)
5 Confirm the send and wait for blockchain confirmation
Cash App will prompt you to confirm with your PIN, Touch ID, or Face ID. After confirming, the transaction is broadcast to the Bitcoin network. Return to the Blockonomics page — it will update automatically from Waiting → Seen → Confirmed within 10–60 minutes depending on Bitcoin network congestion.
You can track your transaction in Cash App under Bitcoin tab → Activity, where Cash App shows the transaction ID (txid). Save this as proof of payment.
⚠️ Cash App withdrawal limits: Cash App imposes weekly Bitcoin withdrawal limits (typically $2,000/week for verified accounts, higher after additional verification). If your order total exceeds your current limit, you may need to request a limit increase in the app under Profile → Bitcoin → Withdrawal Limit, or split across multiple smaller orders placed over time.
4. Step-by-Step: Paying with USDT (ERC-20)
⚠️ Two things to confirm before starting:
1. You are sending USDT on Ethereum (ERC-20) only — not Tron (TRC-20) or Solana (SPL). The wallet address starts with 0x…
2. Your wallet also contains ETH for gas fees — see Step 1 below.
1 Get USDT (ERC-20) — and ETH for gas
Buy or convert to USDT on Coinbase, Kraken, or your exchange. USDT is a stablecoin — 1 USDT = $1 USD, so a $312 order requires 312 USDT.
⛽ ETH for gas — required if using a self-hosted wallet:
Sending USDT on the Ethereum network requires a separate ETH balance in the same wallet to pay the Ethereum gas fee. USDT cannot pay its own gas. You need approximately 0.001–0.002 ETH (~$2–5) available. Without it, the transaction will fail.
• Using MetaMask or Exodus? Buy ETH on your exchange, withdraw it to the same wallet address as your USDT, then send USDT.
• Using Coinbase exchange directly? Coinbase manages gas automatically — no separate ETH purchase needed. The fee is shown before you confirm.
2 Place your order at qsc-usa.com
Add items to cart, apply any coupon codes on the cart page. At checkout, select USDT (ERC-20) as your payment method, fill in shipping details, and click “Place order.”
3 The Blockonomics payment page loads
The Blockonomics page shows:
• The exact USDT amount (e.g. 312.00 USDT — matches your USD order total)
• An Ethereum wallet address in 0x… format
• A QR code
• A live payment status tracker
Keep this page open — it updates automatically as your transaction is detected.
4 Send USDT to the Ethereum address shown
In your exchange or wallet, go to Send / Withdraw USDT. Paste the 0x… wallet address from Blockonomics. Set the network to Ethereum (ERC-20). Your wallet will show the estimated gas fee — confirm you have enough ETH to cover it. Enter the exact USDT amount shown. Confirm and send.
⚠️ Triple-check before confirming:
• Address starts with 0x… and matches Blockonomics exactly
• Network is set to Ethereum — not Tron, not Solana
• Your ETH balance covers the estimated gas fee
• Amount is the USDT figure shown
5 Wait for Ethereum confirmation
USDT on Ethereum confirms in 1–5 minutes under normal conditions. Blockonomics detects the transaction and updates your order status automatically. Your order moves to Processing and QSC begins fulfillment within 1–3 business days.
5. How Blockonomics Works
What is Blockonomics?
Blockonomics is a non-custodial crypto payment processor integrated into QSC’s WooCommerce store. It generates a unique wallet address per order, monitors the blockchain, and automatically updates your order status on confirmation. Payment goes directly to QSC — Blockonomics never holds funds. No manual confirmation from you or QSC is required.
What does the Blockonomics payment page show?
After clicking “Place order” in the store you land on a Blockonomics-hosted page with: crypto amount owed, unique wallet address, QR code, and a live status tracker. Status progresses automatically: Waiting → Seen → Confirmed. No refresh needed — keep the page open.
I closed the Blockonomics page before paying — what now?
Your order still exists. Log in → My Account → Orders → find the Pending Payment order → click it for the payment link. If the window expired, email [email protected] with your order number.
Order still shows “Pending Payment” after paying — what to do
Check the transaction on a blockchain explorer first:
• BTC:mempool.space — search wallet address or transaction ID
• USDT/ETH:etherscan.io — search the 0x… address or transaction hash
If confirmed on-chain but order still pending after 2 hours, email [email protected] with order number + transaction hash.
6. Tips & Final Warnings
✅ Triple-check before sending
Crypto is irreversible. Before Send: (1) address matches Blockonomics, (2) network is Ethereum for USDT, (3) ETH balance covers gas, (4) amount is exact. There is no undo.
⛽ Top up ETH before USDT payments
If sending USDT from MetaMask or Exodus, check your ETH balance first. A failed USDT transaction due to insufficient gas still consumes a small gas fee. Keep 0.001–0.002 ETH on hand at all times.
📸 Save your transaction ID
Copy your txid/hash from your exchange after sending. Screenshot the Blockonomics confirmation. This is your proof of payment if any issue arises with your order.
⏳ Don’t panic during confirmation
BTC can take up to 60 minutes. USDT/ETH is usually 1–5 minutes. “Waiting” on Blockonomics means the transaction is in the queue — not lost. Keep the page open.
💱 BTC: act fast on the rate lock
The BTC rate on Blockonomics is locked for a limited window. Have your exchange app ready before placing the order so you can send promptly before the timer expires.
🚫 Never pay via DM or email address
The only legitimate QSC wallet address is on the Blockonomics checkout page at qsc-usa.com. Any address sent via email, Telegram, Reddit, or DM is a scam.
7. FAQ
Does QSC accept credit cards or PayPal?
No. QSC accepts Bitcoin (BTC) and USDT (ERC-20) only, processed via Blockonomics. No credit cards, debit cards, bank transfers, or PayPal.
Can I use Cash App to pay QSC?
Yes — Cash App can be used to send Bitcoin (BTC) to the Blockonomics address shown after placing your order. Cash App does not support USDT or ERC-20 tokens, so you must select Bitcoin as your payment method at QSC checkout. Identity verification is required in Cash App before you can withdraw BTC to an external wallet address. See Section 3b for full instructions.
Why is my Cash App Bitcoin withdrawal blocked or delayed?
Two common causes: (1) Identity not verified — Cash App requires government ID verification to send BTC to external addresses. Complete this under Profile → Personal before attempting to pay. (2) Newly purchased BTC — Cash App often holds freshly purchased Bitcoin for 24–72 hours before allowing external withdrawal. Buy your BTC at least a day in advance. If your send is blocked due to a weekly withdrawal limit, you can request an increase under Profile → Bitcoin → Withdrawal Limit.
Do I need ETH to pay QSC with USDT?
Yes — if sending from a self-hosted wallet like MetaMask or Exodus. You need ETH in the same wallet to pay the Ethereum network gas fee (typically $2–15). USDT cannot pay its own gas on the Ethereum network. If you send USDT directly from a Coinbase exchange account, Coinbase handles gas automatically and shows the fee before you confirm.
Can I send USDT from Coinbase directly to QSC?
Yes. When sending USDT from Coinbase, select Ethereum (ERC-20) as the network — not Tron or Solana. Coinbase handles gas automatically. Do not use Coinbase Wallet (the separate app) unless you have ETH in it for gas.
My USDT transaction failed — why?
The most common cause is insufficient ETH for gas. Check your ETH balance in the wallet you sent from. Add 0.001–0.002 ETH to the wallet and try again. Note: a failed transaction may still consume a small gas fee.
What if I sent USDT on the wrong network (Tron or Solana)?
Unfortunately these funds cannot be recovered. QSC’s Ethereum address does not exist on the Tron or Solana networks — the tokens are sent to an address that does not exist on those chains and are permanently lost. This is why confirming the network before sending is critical.
How do I know QSC received my payment?
Once confirmed on-chain, Blockonomics automatically updates your order from Pending Payment to Processing. You also receive an order status email. No need to contact QSC — fully automated.
Order still Pending Payment after confirmed on-chain — what to do?
Verify on mempool.space (BTC) or etherscan.io (USDT/ETH) that the transaction shows as confirmed. If it does, email [email protected] with your order number and transaction hash.
Research Use Only: All products sold on qsc-usa.com are intended strictly for laboratory research purposes only. They are not approved for human consumption, veterinary use, or any other application. Researchers are responsible for understanding and complying with local regulations in their jurisdiction.
