Altcoin Payment Gateway: Accept 1,800+ Tokens, Settle in Stablecoins
An altcoin payment gateway lets your customers pay with coins other than Bitcoin: ETH, SOL, POL, AVAX, TRX, ARB, and long-tail tokens. The hard part isn't taking those coins. It's not ending up with a wallet full of volatile tokens on 20 different chains.
This guide explains how altcoin payments work, what to check before you choose a provider, and how OrcaRail lets customers pay in almost any token while you receive the stablecoin and network you chose.
What an altcoin payment gateway does
A crypto payment gateway sits between your checkout and the blockchain. For each order it:
- Prices the order in the customer's coin, using a live rate.
- Shows a payment page with an address or a wallet connection.
- Watches the chain and waits for enough confirmations.
- Tells your backend the order is paid (usually with a webhook).
- Sends the funds to you: in the same coin, or converted.
An altcoin gateway does this for many coins and networks, not only BTC. Step 5 is where gateways differ most, so it's the first thing to check.
Altcoins vs stablecoins: what you actually want to receive
Customers want to pay with what they hold. Most merchants want to receive something stable, because their costs are in dollars or euros.
| You receive… | Good for | Risk |
|---|---|---|
| The same altcoin | Treasuries that want to hold that coin | Price moves between sale and spend; one balance per coin and chain |
| A stablecoin (USDC, USDT) | Most shops, SaaS, and marketplaces | Stablecoin issuer risk; small swap cost |
| Fiat in a bank account | Merchants who never want to touch crypto | Off-ramp fees, KYC, slower settlement |
The best setup for most businesses is "pay in anything, receive a stablecoin": customers keep their choice, and your books stay in one currency.
How OrcaRail handles altcoin payments
OrcaRail uses Relay for swaps and cross-chain bridging, and syncs its network and token lists from Relay automatically (how that works).
When we checked the live API on 28 October 2026:
| What | Count |
|---|---|
| Mainnet networks | 75 (EVM chains, Solana, Bitcoin, Tron) |
| Token listings across those networks | 2,482 (about 1,894 distinct symbols) |
| Networks where USDC is listed | 45 |
| Networks where USDT is listed | 31 |
| Networks where ETH is listed | 42 |
The list changes as Relay adds chains and tokens. Always read the current one from Networks and tokens or the API.
The flow:
- You set what you receive. When you create a payment intent, you choose the token and network you want to receive, for example USDC on Base.
- The customer picks what they pay with. On the hosted pay page they can choose another token or network, for example ETH on Arbitrum or SOL on Solana.
- The quote includes the conversion. If the payer's token or network differs from yours, the quote adds a bridge fee from Relay, paid in the payer's token. The payer sends enough that you still receive the full amount. See Fees.
- You get a webhook when the payment is confirmed, and the funds go to your withdrawal address for that chain.
So you don't need one integration per coin, and you don't hold 40 balances.
What to check before you choose an altcoin payment provider
Use this checklist when you compare providers, including OrcaRail:
- Which coins and networks, exactly? A "300+ coins" claim means little if your customers' chain isn't there. Ask for a live list or API, not a logo wall.
- What do you receive? The same coin, a stablecoin, or fiat? Can you choose per payment?
- Who pays the conversion cost? Is the swap or bridge fee shown to the payer in the quote, or taken from your payout?
- Underpayments and wrong-network payments. What happens if a customer sends too little, or sends USDT on the wrong chain?
- Confirmations. How many blocks before an order counts as paid, per chain? Faster chains mean faster checkout.
- Custody. Does the provider hold your funds, and for how long? Is there a non-custodial path? (OrcaRail is moving EVM and Solana payments to on-chain receivers; see the non-custodial overview.)
- Recurring billing. Altcoin gateways rarely support subscriptions. If you sell SaaS or memberships, check this early (OrcaRail subscriptions).
- Fees. Compare the gateway fee and the conversion fee together. OrcaRail's hosted fee is 0.5% per completed transaction after the first 1,000 free transactions (pricing).
- A real test mode. You should be able to run the full flow on testnets before going live.
For fees and features of other providers side by side, see our list of crypto payment gateways.
Accept altcoins with the OrcaRail API
A minimal integration, in order:
- Create a free sandbox organization and an
ak_test_API key. - List networks and tokens:
GET /payments/networksandGET /payments/networks/:id/tokens. Pick the token and network you want to receive. - Create a payment intent with that
tokenIdandnetworkId, then confirm it and redirect the customer to the hosted pay page. - Handle the webhook and mark the order paid.
- Switch to a live organization and an
ak_live_key when you're ready.
The Node.js and PHP SDKs wrap these calls, and the WooCommerce plugin does it without code. Start at Getting started.
To try payments without spending real money, use testnet faucets or click Simulate payment in the sandbox.
FAQ
What is the difference between an altcoin payment gateway and a Bitcoin payment gateway?
A Bitcoin gateway accepts BTC only, often with Lightning. An altcoin gateway accepts many coins and networks. OrcaRail accepts both: Bitcoin is one of its 75 networks.
Can customers pay with meme coins or small-cap tokens?
If Relay can route the token on that network, it can appear on the pay page. Small tokens can have thin liquidity, which makes the swap cost higher. The quote shows the cost before the customer pays.
Do I have to hold the altcoins I receive?
No. You choose the token and network you receive when you create the payment intent. Most merchants pick USDC or USDT.
Which networks have the cheapest fees for customers?
Usually layer-2 EVM chains (Base, Arbitrum, Optimism), Solana, and Tron for USDT. Ethereum mainnet is the most expensive. Fees change with network load, so the quote is the source of truth.
Is there a free way to test altcoin payments?
Yes. Sandbox organizations run on testnets only, with free test tokens and simulated payments. See Sandbox overview.