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How to pay a peptide vendor with crypto

Many research-peptide vendors take only crypto, Zelle or similar transfers. This guide covers how crypto payment works in practice and the mistakes that cost buyers money or leave an order unpaid. It is a how-to, not financial or legal advice, and it is not a recommendation to pay any particular vendor.

1. Check the vendor before you send anything

• Open the vendor's page in the vendor list and look at its metascore, independent lab tests and whether its lab reports hold up. Vendors banned for fake lab reports are marked.
• Read the verified buyer scam reports for that vendor. Look for the same complaint repeated: orders that never ship, or "payment not received" after buyers say they paid.
• Make sure you are on the vendor's real website. Clone sites copy known brands, and a clone's payment address belongs to the scammer.
• Start with a small first order. Learn how the vendor handles payment, shipping and support before you commit a large amount.

2. Send exactly the right coin on the right network

This is the most common way to lose funds. A coin often exists on several networks (for example a stablecoin on Ethereum, Tron or Solana), and an address that works on one may not work on another. A transfer sent on the wrong network can be lost for good, or recoverable only with the vendor's or exchange's help, if at all.

• Use the coin and network the vendor's checkout shows. If it only gives an address and no network, ask the vendor before sending.
• Copy the address with the copy button or scan the QR code, then compare the first and last several characters. Do not type it by hand. Use a fresh address for each order: many checkouts generate a new one every time, and an old address can stop being watched.
• If the checkout asks for a memo, tag or reference, include it exactly. Without it the payment may arrive but never be matched to your order.
• Send a small test amount first only if the vendor says that is fine; many checkouts want one payment for the exact total.

3. Fees, confirmation times and payment windows

"My payment didn't clear" usually comes down to one of these:

• The payment window expired. Most checkouts quote a crypto amount for a limited time. A transaction that confirms after the window closes may be flagged underpaid, late or on hold. Fund your exchange or app account before you open the checkout, and pay promptly.
• You sent less than the total. Some services deduct their network fee from the amount sent, so the vendor receives less than the invoice. Check whether your app sends "amount plus fee" or "amount minus fee", and add enough to cover it.
• Not enough confirmations. Networks differ in how long they take, and a busy network or a low fee can slow a transaction. The vendor may wait for a set number of confirmations before marking the order paid.
• Fees vary. Exchanges, apps and networks all charge different fees and change them. Check the withdrawal fee and any minimum in the service's own fee page before you buy, not from this page.

4. If the order says unpaid, pending or on hold

1. Do not send a second payment yet. Double-paying is how a small problem becomes an expensive one.
2. Find the transaction ID (TXID, also called transaction hash) in your app or exchange's withdrawal history. Paste it into a public block explorer for that network to see whether it is pending, confirmed or failed.
3. Email or message the vendor with your order number, the TXID, the coin and network, the amount and the time sent. Keep a screenshot of the checkout showing the address and amount.
4. If the explorer shows it confirmed to the right address and the vendor keeps ignoring you, post a scam report so other buyers can see it.

5. Practical ways to get the coins

PeptideCompare has no partnership with any service below and earns nothing if you use one. Availability, limits, fees and which coins can be sent out differ by country and account type, so confirm on each service's own site.

• Our pick for most US buyers: Coinbase. It is the most widely used regulated US exchange, it supports Bitcoin and the common stablecoins, and its withdrawal history gives you a clear record of every payment. The usual route:
  1. Create an account and complete identity verification. Do this a day or two before you plan to order.
  2. Link a bank account or debit card and buy the coin the vendor's checkout asks for, plus a little extra for the network fee.
  3. Choose Send, paste the vendor's address, and pick the same network the checkout shows. Coinbase lists several networks for some coins; the wrong one can lose the payment.
  4. Copy the transaction ID from your Coinbase history and keep it with your order number.
  Money from a new bank deposit can be held for some days before Coinbase lets you send crypto out. The app shows when it becomes available, so fund the account before you open the vendor's checkout.
• Other exchanges such as Kraken work the same way: verify, buy, then withdraw to the vendor's address on the matching network.
• Payment apps such as Cash App (Bitcoin), Strike (Bitcoin and Lightning), and the crypto features in Venmo and PayPal. Check that the app lets you send crypto out to an external address; some only let you buy and hold, or only send to other users of the same app.
• Bitcoin vs stablecoins. A stablecoin (a coin pegged to a currency such as the US dollar) holds its value while you wait; Bitcoin's price can move between buying and paying. Bitcoin is the most widely accepted; stablecoins work only if the vendor lists that coin and network.
• Lightning. The Bitcoin Lightning Network can be quick and cheap when a vendor offers it, and Strike and some wallets support it. Lightning invoices usually expire quickly, so pay right away, and check that your app can pay an invoice before relying on it.
• Buying through a mainstream, identity-verified service leaves you a record of what you sent. Keep your withdrawal history and TXIDs for every order.

6. Before you click Pay

• Vendor checked in the vendor list and the scam reports.
• Order amount you can afford to lose; first order small.
• Account already funded, withdrawals allowed, fee and minimum understood.
• Coin, network, address and memo match the checkout, and you are inside the payment window.
• Order number and TXID saved so you can prove what you sent.

Related: vendors ranked by metascore, buyer scam reports, how the metascore works. This is general information for research purposes, not financial, legal or medical advice.