Blockchain / Developer Focus

Circle’s Arc, Tether’s Plasma: New Stablecoin Rails

Published August 2, 2026 · 11 min read

Two companies that mint the world’s largest stablecoins just stopped renting blockchain space and started building their own. If you are one of the stablecoin native blockchain developers in 2026 deciding where to deploy next, that shift changes your gas fees, your compliance exposure, and possibly your entire cost structure.

For a decade, Circle and Tether minted USDC and USDT as guest tokens on chains they did not control: Ethereum, Tron, Solana. They collected reserve yield while Ethereum validators and Tron node operators collected the transaction fees. That arrangement just broke. In the second half of 2025, Circle launched a Layer 1 called Arc, Tether backed two separate chains called Plasma and Stable, and Stripe partnered with Paradigm on a fourth network called Tempo. None of this happened by accident, and all of it changes how you should think about where to build.

The decade-long pattern that just broke

Since 2014, Tether minted USDT as an ERC-20 or TRC-20 token on infrastructure it did not own. Circle did the same with USDC starting in 2018. Both companies earned billions in reserve yield on the dollars backing their tokens, while Ethereum and Tron pocketed the gas fees every time someone moved that money. It was a strange split: the issuers had the brand and the float, but none of the settlement revenue.

That split ended fast. Circle announced Arc in August 2025 and described it as a blockchain built specifically for stablecoin finance. Within weeks, Bitfinex backed a Bitcoin-anchored chain called Plasma, and separately seeded a second network called Stable. Stripe, fresh off its $1.1 billion acquisition of stablecoin platform Bridge, started building Tempo with Paradigm. A ChainCatcher analysis of the moment called it exactly what it was: the issuance layer and the network layer, separated for a decade, suddenly recombining under the same roof.

The trigger was regulatory, not just competitive. The GENIUS Act, signed in July 2025, gave stablecoin issuers a federal framework clear enough to justify heavier infrastructure bets. Owning the rails is now a business model, not just a technical flex.

Circle’s Arc: the $3 billion bet still in testnet

Arc is Circle’s answer to a simple question: what if the gas token, the FX engine, and the compliance layer were all built around USDC from day one? Circle’s own announcement describes it as a Layer 1 designed from the ground up for stablecoin native applications, running USDC as native gas, with a built-in institutional FX engine, sub-second finality through a consensus system called Malachite, and configurable privacy for compliant balance shielding.

The numbers behind Arc are hard to ignore. Public testnet went live on October 28, 2025. By early May 2026 it had processed 244.1 million transactions, according to Circle’s own whitepaper. Testnet participants reportedly include Visa, HSBC, BlackRock, and AWS. In May 2026, Circle raised $222 million in an ARC token presale at a $3 billion fully diluted valuation, led by Andreessen Horowitz’s $75 million check, with BlackRock and Apollo Funds also participating.

One detail matters for anyone evaluating governance: of ARC’s 10 billion total token supply, 60% goes to ecosystem development, but Circle keeps 25% for itself, with the remaining 15% held as long-term reserves. Arc is marketed as open infrastructure for any stablecoin issuer, not just Circle’s own products, but the token allocation tells you who actually controls the network in its early years.

“While USDC serves as the native gas token, Arc’s architecture supports other stablecoins through its FX engine and Paymaster functionality. The network is designed as infrastructure for all stablecoin issuers, not exclusively for Circle’s products.”

Tether’s two chains: Plasma and Stable are not the same thing

Here is where most coverage gets sloppy. Tether backs two separate Layer 1 blockchains, and conflating them will cost you if you are actually deploying code.

Plasma is Bitcoin-anchored and EVM-compatible, backed by Bitfinex and Peter Thiel’s Founders Fund. It runs a custom consensus called PlasmaBFT, anchors state checkpoints to Bitcoin for extra settlement security, and lets existing Solidity contracts deploy unchanged. Standard USDT transfers cost the sender nothing, and apps can pay gas directly in USDT instead of the native XPL token. Mainnet beta launched on September 25, 2025, with $2 billion in stablecoin liquidity deployed across more than 100 DeFi partners, including Aave, Ethena, Fluid, and Euler.

Stable is a different project entirely, seeded by Bitfinex and Hack VC with participation from Franklin Templeton, Castle Island Ventures, and Susquehanna in a $28 million raise. Stable uses USDT itself as the gas asset, offers sub-second finality, full EVM compatibility, and institutional features like guaranteed blockspace and confidential transfers. It launched mainnet with a native STABLE token and an independent Stable Foundation, and in a February 4, 2026 upgrade it switched its gas token from an interim gUSDT to the LayerZero-based USDT0.

Plasma’s early growth shows how volatile “instant” liquidity can be. It pulled in $5.6 billion in deposits within one week of launch, then TVL dropped to roughly $1.8 billion as yield-farming incentives normalized, before recovering to $2.04 billion by mid-April 2026, making it the seventh-largest chain by liquidity. Aave deposits on Plasma reportedly hit $5.8 billion within 48 hours of mainnet, per USDT0’s own materials, a figure worth treating as a company claim rather than an audited fact.

The nuance that changes the whole framing: Tether’s own CEO does not call this a “Tether chain.”

“There is no Tether chain and I don’t think there will be ever a Tether chain, but there are good opportunities and good teams that can build great ecosystems.”

That is Paolo Ardoino, CEO of Tether and CTO of Bitfinex, on the Bankless podcast. Unlike Circle, which put its name directly on Arc, Tether is deliberately arm’s length about Plasma and Stable. Both are affiliated, independently branded networks, not an official Tether product. For developers, that distinction matters for support channels, governance expectations, and who you actually call when something breaks.

Arc vs. Plasma vs. Stable vs. Tempo, side by side

One more chain worth knowing: Ethena’s Converge takes the opposite architectural bet. Instead of launching as a sovereign L1 like Arc, Plasma, and Stable, it built as an Ethereum Layer 2, specifically to stay interoperable with Ethereum rather than compete with it. That is the road not taken by the three chains above, and it is worth watching whether it ages better.

What this means if you are building on these chains

Chain selection used to mean picking an L2. Now it means picking a trust model. Here is what actually changes for your stack.

Gas volatility disappears, but so does gas-token diversification. Paying fees in USDC or USDT instead of a volatile native token is a genuine UX win for payment apps. It also means your entire cost structure is now tied to one issuer’s stablecoin staying pegged and liquid. If that peg wobbles, so does your fee model.

Compliance is opt-in privacy, not decentralization. Arc’s “opt-in privacy” and “selectively shielded balances,” and Stable’s confidential transfer features, mean issuer-level freeze and compliance capability is baked into the base layer. That is a materially different risk profile than deploying on permissionless Ethereum or Tron, and it is worth reading the fine print before you build anything that depends on censorship resistance.

Validator sets are curated at launch, not open. Plasma’s mainnet beta launched with a curated validator set, and Circle has described Arc’s initial model as permissioned proof of stake, with decentralization promised later. Do not assume day one censorship resistance on any of these chains.

The “free” transfers are subsidized, not free. Plasma’s zero-fee USDT transfers rely on Tether continuing to underwrite the cost, with more complex transaction fees expected to cover the gap over time. If that subsidy model changes, so does your user-facing fee. Any production integration built around free transfers needs a fallback cost model, full stop.

Build against testnets, not press releases. Arc’s mainnet is a moving target. Plasma and Stable are both already live. Treat announced dates as directional and watch for the actual mainnet beta announcement before you commit production infrastructure.

The skeptic’s case: neutrality claims vs. issuer self-interest

Both Circle and Tether describe their chains as open, neutral infrastructure for any stablecoin issuer. The numbers complicate that claim. Circle keeps 25% of ARC’s total token supply. Tether and Bitfinex seeded both Plasma and Stable with direct capital, and Plasma got preferential integration into Tether’s own wallet on launch day.

Nick Van Eck, co-founder and CEO of stablecoin issuer Agora, made a related argument about Stripe’s Bridge that applies here with equal force.

“If Hyperliquid relinquishes its canonical stablecoin to Stripe, a vertically integrated issuer with clear conflicts, what are we all even doing?”

Swap Stripe for Circle or Tether and the logic holds: an issuer that also runs the settlement rail has every incentive to route its own stablecoin’s activity preferentially, even on infrastructure it calls “open.”

There is a fragmentation risk too. Young Cho, CEO of Ethena-linked treasury company StablecoinX, warned that stablecoin-specific chains could fragment activity and reduce Ethereum’s centrality in the market. Extend that logic and you get liquidity, tooling, and composability splintering across Arc, Plasma, Stable, and Tempo at once, with no clear market leader yet in what CoinGecko calls the “stablechain” category.

Plasma’s own trajectory is the clearest cautionary data point. It raised $373 million and pulled in $5.6 billion in deposits within a week of launch, then TVL fell to roughly $1.8 billion once yield-farming incentives normalized. Analysts at BlockEden.xyz called it a classic incentive misalignment: the chain converted yield farmers, not payment users. Displacing Tron’s entrenched USDT position, they note, will take years of sustained Tether support and successful conversion of subsidized growth into organic network effects.

Our read: this signals infrastructure ownership is becoming the real stablecoin battleground, not token issuance. Whoever controls the rails captures the fee revenue Ethereum and Tron used to keep. Polygon’s Aishwary Gupta put the whole dynamic in one line: “he who controls the rails, controls everything.”

There is a second-order risk that rarely makes developer-facing coverage. A February 2026 study found stablecoin partnerships were associated with partner banks seeing roughly 67% higher interbank payments, 38 to 55% greater intraday reserve volatility, and a 14 percentage point drop in loans-to-assets ratios. Separate Federal Reserve research from economist Jessie Jiaxu Wang found domestic stablecoin demand directly reduces U.S. bank deposits. A settlement chain that makes stablecoins faster and cheaper to move could accelerate exactly that deposit flight, and it is worth watching how regulators respond as Arc, Plasma, and Stable scale.

Frequently asked questions

What is Circle’s Arc blockchain?
Arc is an open Layer 1 blockchain built by Circle for stablecoin native finance, using USDC as native gas, with sub-second finality, a built-in FX engine, and opt-in privacy. It entered public testnet in October 2025, with mainnet beta targeted for 2026.

What is Tether’s Plasma blockchain?
Plasma is a Bitcoin-anchored, EVM-compatible Layer 1 built around Tether’s USDT, backed by Bitfinex and Founders Fund. It offers zero-fee USDT transfers and launched mainnet beta on September 25, 2025.

Is Plasma the same as Stable?
No. They are separate Tether-ecosystem blockchains. Plasma is Bitcoin-anchored with a custom BFT consensus. Stable is a distinct project seeded by Bitfinex and Hack VC that uses USDT as its gas asset, with its own native token and foundation.

Why are Circle and Tether building their own blockchains?
Issuers earned stablecoin float yield for years but captured none of the transaction fee revenue generated on chains like Ethereum and Tron. Owning the rails lets them capture settlement revenue and control compliance features directly.

Does Circle’s Arc have a mainnet yet?
Not as of this writing. Arc remains in public testnet, live since October 28, 2025, with no confirmed mainnet date. Treat any “imminent launch” claims as unverified until Circle announces one officially.

What is USDT0 and how does it relate to Plasma and Stable?
USDT0 is the omnichain version of USDT, operated by Everdawn Labs under license from Tether. Real USDT locks in a vault on Ethereum while an equivalent amount mints on destination chains via LayerZero. Both Plasma and Stable rely on it for cross-chain liquidity.

What to watch over the next 6 to 18 months

Three things will tell you whether this bet paid off. First, whether Arc actually ships a mainnet in 2026 or slips into 2027 while Visa, BlackRock, and HSBC quietly lean harder on already-live alternatives. Second, whether Plasma and Stable can convert their subsidized launch liquidity into organic, non-farmed transaction volume, given USDT0’s dependence on LayerZero’s cross-chain messaging as an added point of failure. Third, whether regulators start treating issuer-run settlement chains as a concentration risk, since a chain outage or freeze decision would now hit both the stablecoin and its primary settlement rail at the same time.

What you now understand that most coverage glosses over: this is not “Circle versus Tether” as a symmetric race. Plasma and Stable are live, in production, moving billions in real liquidity. Arc is still a testnet with a $3 billion valuation and no mainnet date. Build accordingly, and do not confuse a funding round for a production-readiness signal.

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