Arc Mainnet is live: How to choose the right RPC provider for builders

Arc went live on mainnet on September 16, 2026, with eleven institutional founding validators already committed. The RPC layer underneath is what determines whether any application, from a bank's settlement pipeline to onchain liquidity and swap activity, can actually ship on day one.

Arc is the EVM-compatible layer 1 built by Circle, the issuer of USDC, purpose-designed for stablecoin-native finance: payments, FX, treasury operations, tokenized assets, and capital-markets settlement. It ran as a public testnet from October 2025, with institutional participants including BlackRock, Visa, HSBC, Goldman Sachs, and Mastercard testing integrations ahead of launch.

Unlike most L1s that launch hunting for a use case, Arc shipped with a defined mandate around regulated stablecoin settlement, but infrastructure built for that mandate still has to hold up under whatever else lands on a fresh mainnet, from institutional flows to faster-turnover onchain activity.

That range changes what the underlying infrastructure has to deliver. Retail-optimized RPC infrastructure, the kind that ships with rate limits, best-effort uptime, and no archive access, cannot support workloads where a dropped call leaves a settlement half-recorded and a compliance check unverifiable. Cheap or unproven infrastructure at this scale costs more than it saves.

What Arc's RPC layer actually needs to handle

Before selecting a provider, teams building on Arc should evaluate four criteria that separate infrastructure that fits regulated stablecoin-finance workloads from the rest.

Finality is only as fast as the endpoint reading it. Arc finalizes blocks in about half a second: once validators agree, a block doesn't get reorganized or reversed later. That speed only reaches an application if its RPC endpoint keeps pace. For payment and FX applications coordinating settlement windows, and for anyone trading against that same finality, how fast the endpoint responds becomes the practical bottleneck, not how much you pay in fees.

Stale reads cost real money, not just accuracy. Custodians and payment processors settling USDC-denominated transactions need continuous access to historical balance and transaction data, for the audit trail a regulator will request quarterly, but just as much for anyone pricing a position off a balance that may have already changed. If archive access is missing or unreliable, positions at prior blocks can't be reconstructed, an audit turns into a manual reconciliation exercise, and a trading strategy ends up sized against a number that's no longer true.

Some data legally cannot leave the building. A significant share of Arc's stablecoin-finance infrastructure will be built by regulated banks, payment networks, and licensed institutions who cannot place customer-linked transaction data on third-party infrastructure at all, regardless of a provider's SOC 2 or ISO 27001 certifications. That requirement rules out most RPC providers immediately. The exception is teams offering a self-hosted deployment path where nodes run inside the customer's own environment.

Certifications and free-tier limits both signal how a provider expects to be used. SOC 2 Type II and ISO 27001 are no longer premium features for institutional infrastructure. They are baseline requirements for vendor risk review at any regulated buyer. But the same signal matters outside that world too: a free tier that caps out within hours of testing tells any builder, institutional or not, how seriously a provider is thinking about the first weeks after launch.

How Chainstack supports Arc across three deployment models

Chainstack supports Arc on both mainnet and testnet, with full debugging and tracing tools built in and out-of-the-box compatibility with popular developer libraries like ethers.js, viem, and web3.py. Chainstack added Arc testnet support in July 2026 and extended it to mainnet at launch. It is currently the only infrastructure provider offering managed, dedicated, and self-hosted deployment on Arc from a single control plane, holds both SOC 2 Type II and ISO 27001 certifications, and serves 100,000+ developers across 70+ blockchain networks, including every network Arc builders are likely to bridge to or settle against.

Chainstack offers Arc support across three deployment models depending on the workload's operational profile:

The three models compare as follows.

• Global Nodes: elastic, load-balanced infrastructure. Metered by request unit, 99.99% uptime, and 25 to 600 RPS depending on plan.
• Dedicated Nodes: an isolated node instance. No per-request billing, 99.99% uptime, and limit-free throughput by nature.
• Chainstack Self-Hosted: the customer's own cloud, on-premises environment, or bare metal. Unlimited requests, customer-managed uptime, and throughput bounded by the customer's own hardware.

Which deployment fits which workload

• Global Nodes: geo-balanced, auto-scaling RPC endpoints with 99.99% uptime SLA. The same infrastructure powers production wallets, consumer-facing payment apps, and fintech integrations where variable load and fast time-to-market matter more than dedicated single-tenant guarantees.
• Dedicated Nodes: isolated high-performance instances with no per-request billing, full node configuration control, and full debugging and tracing tools. The operational profile trading desks, FX and treasury systems, and high-throughput indexers depend on when deterministic performance under load is the binding constraint.
• Chainstack Self-Hosted: a system for running Arc's Reth and Malachite infrastructure inside the customer's own cloud, on-premises environment, or bare metal, with Chainstack handling deployment, monitoring, updates, and recovery. New nodes start from a snapshot, so they come online fast instead of re-downloading the entire chain history. The deployment model banks, payment networks, and regulated institutions reach for when customer-linked transaction data cannot leave their environment.

Testnet USDC remains available through Circle's own faucet for teams still evaluating the network on testnet. The platform also ships a Model Context Protocol (MCP) server that lets developers query Arc data and provision nodes directly from Claude, Cursor, Windsurf, ChatGPT, Codex, and Gemini, reducing time between prompt and production endpoint to a single natural-language exchange.

What this means for builders

Arc's RPC layer needs deterministic speed, continuous archive access, a path to keep data in-house, and compliance attestations that don't need explaining to a regulator. That is exactly what Chainstack ships across testnet and mainnet, in three deployment models including self-hosted.

For banks, payment networks, and licensed institutions who cannot afford to gamble on infrastructure that ships without archive data, without tracing, without a self-hosted option, or without the compliance attestations their regulator will ask about, Chainstack Self-Hosted and the platform's dedicated Arc product line offer the closest match to what stablecoin-native finance actually needs from its infrastructure layer.