Which network to send on, and why it matters

If you take one thing from this: the coin and the network are two separate choices, and getting the second one wrong is the most common way people lose money paying with crypto. USDT on Ethereum and USDT on Tron are the same asset in name and completely different in practice. Send one to an address for the other and the funds are, in almost every case, unrecoverable.

What a "network" actually is

A network is the ledger the transfer is recorded on. Tether issues USDT on several of them — Ethereum, Tron, Solana and more — and each has its own addresses, its own fees and its own confirmation speed. An exchange withdrawal screen makes you pick one, usually with a label like ERC-20 (Ethereum), TRC-20 (Tron) or SPL (Solana). That dropdown is not a formality.

How to read an address before you send

Addresses have shapes, and the shape tells you the chain. An Ethereum address starts with 0x and is 42 characters. A Tron address starts with T and is 34. A Bitcoin address starts with 1, 3 or bc1. A Solana address is base58 and has no prefix at all. If the payment page gives you a 0x address and your exchange is set to TRC-20, stop — the mismatch is visible before you send, and it is invisible afterwards.

Better still, do not type addresses. Copy them, or scan the QR code, and check the first and last four characters against the page after pasting. Clipboard-hijacking malware exists specifically to swap an address between copy and paste.

Which network to prefer

For small orders, Tron or Solana. Their fees are small and roughly fixed, so a twenty-dollar payment does not pay a ten-dollar fee. Ethereum's fee is set by demand for block space rather than by the size of your transfer — Ethereum's documentation on gas explains the mechanism — which means the same transfer can cost cents one day and a great deal more the next.

For large orders, that fee stops mattering and other things do: Bitcoin's settlement is slower but its confirmation model is the most battle-tested there is. For anything mid-sized, a stablecoin on a cheap chain is usually the least stressful choice, because the amount you owe does not move while you are sending it.

Network minimums

Every payment processor sets a minimum per coin, because a payment worth less than the fee to move it cannot be settled. Coins below the minimum for your order size are hidden at checkout rather than left available to fail after you have sent funds. If a coin you expected is missing, that is usually why, and a different network for the same coin will normally appear instead.

Confirmations, and why the wait is not a delay

A transaction is broadcast instantly and confirmed gradually. Most processors wait for a small number of confirmations before treating a payment as final, because a transaction with zero confirmations can still be replaced. On Tron and Solana this is seconds. On Ethereum it is usually under a minute. On Bitcoin it can be tens of minutes, and paying a low fee during busy periods can stretch that considerably.

The memo field, and the second way funds vanish

Some chains identify the destination with an address plus a second value — a memo, tag or note. Several exchange deposit addresses work this way. The address alone belongs to a pooled wallet holding thousands of people's funds, and the memo is the only thing saying which of those people you are.

Send without it and the transaction confirms perfectly while crediting nobody. Recovery means the receiving business manually searching its ledger, which some will do and some will not. If a payment page shows a memo field, treat it as part of the address rather than an optional reference.

If your payment is sitting unconfirmed, or you sent the wrong amount, payment windows and stuck payments covers what happens next. For the wider picture, start at how to buy anything with crypto.