§ Guide · 2026-09-03

One stable asset.
Which one, on which chain.

The moment you turn on Auto Settle, the coin-selection problem at the checkout disappears — accept everything, hold one thing. But it doesn't disappear, it moves. You've just handed yourself a treasury decision: which stablecoin, and on which chain. It's a smaller, quieter question than "should I accept DOGE," and most merchants never think it through. It's worth ten minutes, because the wrong answer quietly taxes every withdrawal you ever make. This is operational cost analysis, not investment advice.

Two decisions, not one

"Settle into a stablecoin" is really two choices stacked on top of each other, and they trade off against different things:

The issuer — USDT (Tether) or USDC (Circle). This decides who is on the hook for the dollar peg, how liquid your holding is, and where you can spend it without a conversion.
The chain — Tron, Solana, Polygon, Ethereum, BSC. This decides almost nothing about the dollar you hold, and almost everything about what it costs to move it. Both USDT and USDC exist as the same six-decimal token on multiple chains; "$1,000 of USDT on Tron" and "$1,000 of USDT on Ethereum" are the same claim on Tether, redeemable one-for-one, but they cost wildly different amounts to withdraw.

People conflate these constantly ("I hold USDT" — on what?). Keep them separate and the whole thing gets easy.

USDT vs USDC, honestly

Both are centrally issued, dollar-collateralized tokens run by a company. Neither is decentralized, and this matters enough to say plainly: both issuers can and do freeze addresses on legal order. If you're choosing a stablecoin because you want censorship-resistance, you've chosen the wrong asset class — that's what BTC or XMR are for. A stablecoin is a convenience: dollar-denominated books, no volatility window, instant settlement. Judge it on that.

USDT is the bigger, more liquid, more widely accepted of the two. It is the default unit of account across most of the world's exchanges and P2P markets, and it is overwhelmingly dominant on Tron. If your suppliers, your OTC desk, or your off-ramp is anywhere outside the US/EU institutional bubble, they almost certainly quote in USDT. The historical knock on Tether is reserve opacity — for years the attestations were thinner than Circle's — though it remains the deepest-liquidity dollar token in crypto by a wide margin.

USDC trades transparency for reach. Circle is US-regulated and publishes regular attestations of its reserves, which is why US-based businesses, fintechs, and institutional counterparties tend to prefer it. The tradeoff is thinner liquidity in a lot of venues and geographies, and a well-documented peg wobble in March 2023 when reserve exposure to a failed bank briefly knocked it to ~$0.88 before it recovered. Neither token is risk-free; they carry different risks.

The honest default: if you're a global merchant paying global counterparties, hold USDT — you'll spend it without converting. If you're US-facing or you weight reserve transparency and regulatory clarity above liquidity, hold USDC. Both are first-class on OrbChain; there is no wrong answer that ends in tears, only one that costs you an extra swap on the way out.

The chain is where the money actually is

Here's the part that has a right answer. The stablecoin you hold is worth a dollar on every chain. What differs is the withdrawal cost — the network fee to move it out of your OrbChain balance to your own wallet or exchange. Token transfers pay their fee in the chain's native gas coin, not in the token itself, so the fee scales with whatever that chain charges for a token transfer:

Tron (TRC20) — the cheapest place to hold a stablecoin for withdrawal, by a lot. A USDT-TRC20 transfer needs energy, which OrbChain rents just-in-time per broadcast for a few TRX — cents, not dollars. This is why the entire remittance world settled on USDT-TRC20. It is the correct default for most merchants.
Solana (SPL) — effectively free and fast. The signature fee is a fraction of a cent (5,000 lamports). USDC is especially deep on Solana; USDT is there too. Excellent if your off-ramp supports it.
Polygon (POL) — also cents-or-less per transfer, EVM-native, broad tooling support. A strong middle option if you live in the Ethereum ecosystem but refuse to pay Ethereum fees.
Ethereum (ERC20) — the expensive one. A stablecoin transfer on Ethereum mainnet costs real gas, denominated in ETH, and spikes with network congestion — dollars per withdrawal at quiet times, much more during a rush. Hold here only if your counterparties specifically require ERC20 and you withdraw in large, infrequent batches so the fixed fee amortizes.
BSC (BEP20) — cheap like Polygon, if BNB Chain is where your liquidity lives. Note the BEP20 stablecoins carry 18 decimals rather than the 6 used elsewhere; it changes nothing about value, just don't be surprised by the long numbers.

Rule of thumb: the chain determines your withdrawal cost; pick the cheapest chain your off-ramp will accept. For the overwhelming majority that's USDT on Tron. If your exchange or bank rail prefers Solana or Polygon, those are just as cheap. Ethereum is a tax you pay only when someone on the other end insists on it.

Matching the chain to how you withdraw

The fee math interacts with your payout cadence. If you sweep frequently — daily auto-payouts, small amounts — a per-transfer fee that's cents versus dollars compounds into a meaningful number over a year, and Tron/Solana/Polygon win decisively. If you withdraw rarely in large batches, even Ethereum's fee becomes a rounding error against the amount moved. Most subscription and e-commerce merchants are in the first bucket, which is another vote for a cheap chain. See automating your payout schedule for how to wire that up so balances don't sit.

Where the counterparty overrides everything

All of the above assumes you get to choose. Often you don't — the chain is dictated by whoever you're paying or wherever you're cashing out:

If your OTC desk or exchange only credits USDT-TRC20 deposits, hold USDT on Tron, full stop — sending them USDC-SOL means an extra conversion on their side or yours.
If you pay a US supplier who wants USDC on an EVM chain, match them, and prefer Polygon over Ethereum to keep the fee sane.
If you split revenue to partners on different chains, you may deliberately hold a little on two chains rather than convert twice.

The single most expensive mistake is holding the wrong pair for your outflows and paying a conversion spread plus a withdrawal fee every time you cash out. Map your outflows first, then hold what they take.

A default that fits most merchants

If you don't want to overthink it: set Auto Settle to USDT on Tron (TRC20). It's the deepest liquidity, the widest acceptance, and the cheapest withdrawals in one choice. Switch to USDC, or to Solana/Polygon, only when a specific counterparty or a transparency preference gives you a concrete reason to. The gateway adds no markup on the settlement conversion — the deposit fee applies once and the venue rate passes through — so this decision is purely about issuer fit and network cost, nothing hidden.

For the mechanics of how any coin becomes your one stable asset, see accept any coin, settle in USDT; for a chain-by-chain look at the stablecoin itself, USDT on Tron vs Ethereum vs Solana. Wide at the checkout, narrow in the treasury — and now, cheap on the way out.