What are payment blockchains? Tempo, Arc, and stablecoin-native chains explained

A payment blockchain is a network built mainly to move stablecoins. Tempo (incubated by Stripe and Paradigm, live since March 18, 2026) and Circle's Arc (live since September 16, 2026) both charge fees in stablecoins instead of a volatile gas token and finalize transactions in under a second. They compete with general-purpose chains like Ethereum and Solana for payment flows.

If you are new to the basic split between the rail and the asset, start with blockchain payments vs crypto payments. This page is about the rail.

Key takeaways

• Payment blockchains pay fees in stablecoins (Tempo: USD stablecoins, Arc: USDC), so a sender never needs ETH or SOL.
• Both advertise deterministic sub-second finality, which means a confirmed transfer cannot be rolled back.
• Tempo reserves blockspace for payments and supports 32-byte transfer memos for reconciliation.
• General-purpose chains still hold most stablecoin liquidity, so new chains win on design, not yet on depth.
• BlindPay supports Tempo and Arc alongside seven other networks, nine in total.

What is a payment blockchain?

A payment blockchain is a layer 1 network whose design choices start from moving stablecoins, not from hosting every kind of app. In practice that means three things: fees in a stablecoin, fast final settlement, and features that make payments easier to reconcile.

Definition: A payment blockchain (also called a stablecoin-native chain) is a blockchain where stablecoins are the primary asset, network fees are paid in a stablecoin, and the protocol includes payment features such as fast deterministic finality, reserved capacity for transfers, or memo fields.

Compare that with Ethereum. It is a general-purpose network. USDC on Ethereum is one token among thousands, every transfer pays gas in ETH, and the fee moves with demand for the whole network, not just payments.

None of this changes what a stablecoin is. USDC on Arc is still USDC. The difference is the road it travels on.

What is Tempo?

Tempo is a layer 1 blockchain for stablecoin payments, incubated by Stripe and Paradigm. Its FAQ says the mainnet has been live since March 18, 2026, with chain ID 4217.

The payment-specific features, per Tempo's FAQ and developer docs:

• Fees in stablecoins. Network fees are paid in supported USD-denominated stablecoins. There is no volatile native gas token. Fees can also be sponsored by another account, so an app can pay for its users.
• Sub-cent transfers. Tempo states that standard stablecoin transfers have sub-cent fees.
• Finality. Consensus runs Simplex BFT for deterministic sub-second finality, and the FAQ describes settlement "with no re-orgs."
• Payment lanes. Dedicated blockspace for payment transactions, so fees stay predictable when the network is busy with other activity.
• Transfer memos. A 32-byte memo can ride on a stablecoin payment and be matched to a customer, invoice, or order through transfer events.

Tempo is EVM compatible, with documented differences around fee tokens and wallet behavior. Solidity contracts and standard Ethereum tooling work.

What is Arc?

Arc is Circle's layer 1 blockchain, built around USDC. Circle opened the public mainnet on September 16, 2026, according to The Block, with users paying gas in USDC and transactions finalizing in under a second.

From Arc's own site as of launch:

• USDC as native gas. Fees are paid in USDC, so a wallet holding only USDC can transact.
• Deterministic sub-second finality.
• EVM compatible. Existing Ethereum contracts and tools work.
• Opt-in privacy. Arc describes configurable privacy that supports compliance obligations.
• Institutional validators. Circle named 11 founding validators in August 2026, including BlackRock, DTCC, ICE, Mastercard, and Visa, joining in phases.

Circle also minted an ARC token at launch. The Block reports Circle called this a technical milestone and not a commitment to a public token launch. Gas stays in USDC either way.

How do Tempo and Arc compare with general-purpose chains?

The main trade is design versus depth. Payment chains are built for transfers. General-purpose chains have years of liquidity, exchange support, and wallet coverage.

Finality figures for the general-purpose chains come from each network's documentation and are collected, with links, in which network to use to off-ramp stablecoins, along with fee models per chain.

Why were payment blockchains built?

They exist because general-purpose chains make payments teams do work that has nothing to do with paying someone. Three problems show up again and again.

Gas tokens. To send USDC on Ethereum you need ETH in the same wallet. Treasury teams end up topping up gas balances across wallets, and a payout fails when one runs dry. Paying fees in the stablecoin itself removes that chore.

Fee spikes. On a shared network, a popular token launch can raise the cost of a payroll run. Reserved payment capacity, like Tempo's payment lanes, is a direct answer.

Finality you can book. Accounting wants a point after which a payment cannot change. Deterministic finality gives a single moment, instead of "wait for N confirmations." Stablecoin API SLAs and settlement finality explains why that line matters for reconciliation.

Tempo and Arc are not the first. Plasma launched a mainnet beta on September 25, 2025 with fee-free USDT transfers during its initial rollout (The Block). Stable launched its mainnet on December 8, 2025 with USDT as the gas token (The Block).

What are the limits of payment blockchains?

They are new, and newness has costs. Liquidity, exchange listings, and wallet support take time to build.

• Thinner liquidity. Chains that launched in 2026 hold far less USDC and USDT than Ethereum, Tron, or Solana, which have had years to build it. A large transfer may need to cross chains first.
• Fewer counterparties. Your supplier's exchange or wallet may not support Arc or Tempo yet. Sending to a network the recipient cannot receive on is one of the common stablecoin payout mistakes.
• Validator models. Both chains launched with selected validator sets of known institutions. That suits regulated payments, but it is a different trust model from a fully open network. Read each chain's documentation and decide what you need.
• Short track records. Months of mainnet history, not years.

None of these limits matter much if the stablecoin leg is invisible to you, which is the case when a provider handles it.

Does the chain matter if you only want bank-to-bank payments?

Usually not. If a business sends dollars and its supplier receives pesos, the bank rails at each end decide most of the timing, and the chain in the middle settles in seconds either way.

That is why BlindPay offers two ways in. With the bank-rail flavor of the API, you work with virtual accounts, payins, and payouts, and the stablecoin settlement happens behind the scenes. With the advanced flavor, you pick the network and token yourself, which matters if your users already hold USDC on a specific chain.

BlindPay settles on nine networks: Ethereum, Polygon, Base, Arbitrum, Tempo, Arc, Stellar, Solana, and Tron. Per its supported chains reference, Tempo carries USDC and USDT, Arc carries USDC, and both work for payins, payouts, and external wallets. Arc is part of the cross-chain USDC transfer route set through Circle CCTP v2. Tempo supports same-network transfers.

How should you choose a chain for payments?

Pick the chain your counterparties already use, then check cost and finality. A cheaper chain is useless if the recipient's wallet does not support it.

1. Ask where the money already sits. If customers hold USDT on Tron, start there.
2. Check the recipient side. Confirm the receiving wallet, exchange, or off-ramp supports the network and token pair.
3. Compare total cost, not gas. Gas is usually the smallest line. Spread and payout fees are bigger.
4. Decide if you need the features. Stablecoin gas, memos, and reserved capacity are worth it if you run high volumes or many wallets.
5. Test on testnet. Tempo and Arc both have testnets, and BlindPay development instances support them with its USDB test token.

For the parties involved at each step, see who is involved in a blockchain payment.

What to do next

Map where your senders and recipients hold stablecoins today. If it is Ethereum, Tron, or Solana, stay there and let the off-ramp handle the rest. If you are building a new flow and want stablecoin gas and sub-second finality, test Tempo or Arc on a development instance.

Check the network and token pairs BlindPay accepts in the supported chains reference before you design your first payout.