Arc vs Codex — a chain compared against a payments layer, not another chain

The premise behind "Arc vs Codex" queries is usually that Codex is another purpose-built stablecoin blockchain competing directly with Arc, the way Tempo or Plasma are. As of 2 September 2026, that premise doesn't hold up: Codex (codex.xyz) is a stablecoin-native FX and payments infrastructure company — live, reportedly processing over $1 billion a month — but it runs on top of existing chains, including Ethereum, Solana and Tron, rather than operating its own Layer 1. That makes this a comparison between two different kinds of things, not two competing chains, and the honest version of this guide says so plainly rather than forcing symmetry that isn't there.

What Codex actually is, confirmed

Codex describes itself as "a stablecoin-powered FX infrastructure for businesses that move money across borders" — a platform that converts between fiat currencies and stablecoins at institutional rates for payment service providers, neobanks, remittance companies, fintechs, e-commerce platforms, and commodity traders, operating 24 hours a day, every day of the year (codex.xyz). The company states most transactions settle in under 30 minutes and reports clearing over $1 billion in volume every month — a self-reported figure, not independently audited, and Built on Arc treats it as such.

Codex was founded in 2024 by Haonan Li (CEO), Momo Ong, and Victor Yaw, with a founding team drawn from Wise, Revolut, Airwallex, Binance, and Crypto.com. Its investors include Dragonfly, Coinbase Ventures, Circle Ventures, Wintermute, Cumberland, and Bybit (codex.xyz/about). Notably, Circle Ventures — Circle's own venture arm — is an investor in a company that operates independently of Arc, which is a useful data point about how Circle spreads its bets across the stablecoin infrastructure category rather than only building in-house.

Architecturally, Codex settles across Ethereum and other networks, explicitly including Solana and Tron, and moves value in USDC, USDT, and PYUSD across roughly nine blockchain networks total. Nowhere in its public site, documentation, or blog does Codex describe a proprietary Layer 1, a consensus mechanism, a validator set, or a mainnet launch — because it doesn't have one. It's infrastructure that sits on top of existing chains, not a chain of its own.

Why the "Arc vs Codex" framing needs correcting before it's useful

If a builder is choosing where to deploy a payments or settlement product's actual state — where transactions get ordered, finalized, and secured — Codex isn't in that conversation, because it doesn't own that layer on any of the chains it operates across. Arc is exactly that kind of infrastructure: a Layer 1 with its own validator set (a permissioned cohort of roughly 100 institutions, per Circle), its own consensus (Malachite, a Tendermint-based BFT engine targeting sub-second finality), and its own native gas asset (USDC).

Codex is closer to a payments API or settlement rail a builder plugs into — the kind of product category Built on Arc otherwise covers under payment service providers and payment APIs, not chain infrastructure. The more accurate framing of the choice a builder actually faces is: build directly on a chain like Arc (or Base, or Ethereum), or route payments through a multi-chain infrastructure layer like Codex that abstracts the underlying chain away. Those aren't mutually exclusive — a product could plausibly use Codex for FX conversion and settlement routing while the underlying value eventually touches Arc once Arc's mainnet is live and Codex, or a comparable provider, adds it as a supported network. As of 2 September 2026, no public statement from Codex confirms Arc as one of its supported networks — that's not yet confirmed.

The comparison that is actually fair: coverage and control

Since a chain-vs-chain fee and finality comparison doesn't apply here, the fair axes are coverage and control.

Coverage. Codex already spans roughly nine blockchain networks and settles in three stablecoins (USDC, USDT, PYUSD), giving a builder multi-chain reach today without needing separate integrations per chain. Arc, once live, is a single chain — deep on USDC-native settlement and institutional validator relationships, but narrow in the sense that a builder only gets Arc's own environment, not a router across many.

Control. Building directly on a chain like Arc means a builder owns the integration and the settlement guarantees directly — no intermediary's uptime, pricing, or compliance posture sits between the builder and the chain's own validator set. Routing through an infrastructure layer like Codex means accepting a third party's institutional custody arrangements, its own AML controls (implemented via its own partners, not disclosed in detail publicly), and its own operational risk, in exchange for not having to integrate chain-by-chain.

Compliance and counterparty posture. Arc's validator cohort is public and named — eleven institutions including BlackRock, DTCC, and Visa, disclosed by Circle in an August 2026 press release. Codex's compliance posture is described only generally ("onchain and offchain AML controls via partners") without named partners or a public audit disclosed on its site as of this writing — a materially thinner public record than Arc's, and worth flagging rather than papering over.

What this means for a builder choosing today

If the question is "which chain should my settlement layer run on," Codex isn't an answer to that question — it's infrastructure that could sit in front of whichever chain you pick, including, eventually, Arc. If the question is "should I build directly on Arc, or route through a multi-chain payments layer that abstracts chain choice away," that's the real decision, and it depends on whether a builder wants direct control over settlement (favoring building on Arc, or another chain, directly) or wants to defer chain selection and cross-chain complexity to a third party (favoring an infrastructure layer like Codex). Both are legitimate approaches, and they aren't mutually exclusive over time.

Built on Arc's broader stance holds here too: this isn't a ranking, and the honest finding — that Codex isn't the kind of thing Arc can be directly measured against — is more useful to a builder than forcing a chain-vs-chain table where the categories don't match. For the roster of stablecoin-native Layer 1s that are actually comparable to Arc on chain-level terms, see Built on Arc's stablecoin chains compared hub instead.

Built on Arc is an independent directory. Arc is a Circle product; we are not affiliated with, endorsed by, or operated by Circle.

Sources: - Codex — official site - Codex — About / team and investors - Codex — blog - Circle Announces Founding Validator Cohort and Major Integrations for Arc