Polygon, Explained

An Ethereum-aligned scaling network that has quietly become one of the most-used blockchains for stablecoin settlement, Polygon is now repositioning itself as infrastructure for a global, permissionless payment system it calls the Open Money Stack.

What Polygon Is and How It Started

Polygon launched in 2017 under the name Matic Network, originally conceived as a sidechain solution to Ethereum's throughput limitations. Where Ethereum at the time processed roughly 15 transactions per second at unpredictable fees, Polygon's Proof-of-Stake (PoS) chain offered near-instant finality, fees measured in fractions of a cent, and full EVM compatibility — meaning any smart contract written for Ethereum could be deployed on Polygon without modification.

The network rebranded to Polygon in 2021 and began acquiring and building an array of scaling technologies: a zkEVM rollup, a chain development kit (CDK) for launching custom blockchains, and an interoperability protocol called AggLayer. Its native token, originally MATIC, migrated to POL in 2024 as part of a broader architectural overhaul known as Polygon 2.0.

By early 2026, the PoS chain was processing more than five million daily transactions, had roughly 1.89 million monthly active users, and had accumulated over $1.2 billion in total value locked across its DeFi ecosystem — modest by some measures, but underpinned by a distinctive advantage: Polygon is the second most active blockchain by USDC addresses and has emerged as a leading chain by stablecoin transaction count.

Benthic

Jun 22, 2026

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The Architecture: PoS Chain, CDK, AggLayer, and ZK Proving

Polygon's technical stack has grown considerably more complex than its sidechain origins suggest. There are now several layers:

Polygon PoS remains the network's workhorse — a delegated proof-of-stake chain secured by validators staking POL, currently capable of around 5,000 transactions per second following the Heimdall v2 and Rio upgrades. It handles the bulk of user activity, from DeFi to stablecoin transfers.

Polygon CDK (Chain Development Kit) is a framework that lets developers launch application-specific chains — custom L2s and L3s — that interoperate with the broader Polygon ecosystem. Projects including Immutable and Astar have built on CDK.

AggLayer is Polygon's interoperability layer and arguably its most architecturally distinctive bet. Rather than bridging assets between chains with custody risk, AggLayer uses ZK proofs to unify state and liquidity across multiple chains — including CDK chains and eventually third-party networks — such that a user on one chain can interact with a contract on another without switching wallets or manually bridging. In 2026, AggLayer went chain-agnostic, meaning it can now aggregate chains that weren't built with Polygon tooling.

ZisK is a newer component that originated as an internal experiment at Polygon Labs: a ZK-proving engine designed to make zero-knowledge proofs faster and cheaper to generate. Its launch drew attention because faster proving directly reduces the cost and latency of ZK-backed finality across the entire stack. The team behind ZisK, led by engineer jbaylina, shipped it as an open system available to any project that needs performant proof generation.

The zkEVM Chapter Closes

Polygon's zkEVM — an Ethereum-compatible ZK rollup launched in March 2023 — is being sunset. The mainnet beta sequencer shuts down July 1, 2026, ending what was an ambitious but ultimately slow-to-gain-traction experiment. Users and protocols with funds in zkEVM DeFi positions are being urged to withdraw immediately; assets left in protocols after the sequencer halt are not recoverable through normal means.

The closure reflects a broader industry pattern: early-generation zkEVM deployments faced stiff competition, required significant proving overhead, and struggled to accumulate the liquidity and developer ecosystems that more established chains enjoy. Polygon's pivot is not away from ZK technology — it remains central to AggLayer and ZisK — but away from running a general-purpose ZK rollup in an already crowded market.

The Open Money Stack: A Payment-First Strategy

In early 2026, Polygon Labs articulated a strategic reframe: the network's primary goal is to become the settlement layer for global money movement, particularly stablecoin-denominated payments. The vehicle for this is the Open Money Stack, a modular API that bundles together Polygon PoS, AggLayer, Trails (a cross-chain orchestration layer), wallet primitives, fiat on/off ramps, and compliance tooling into a single integration surface.

The thesis is straightforward: most of the practical barriers to onchain payments — fragmented chains, clunky bridging UX, no fiat access, compliance uncertainty — can be abstracted away by a vertically integrated stack. A fintech company should be able to wire into the Open Money Stack and offer users stablecoin-denominated payroll, cross-border transfers, or merchant settlement without knowing anything about which underlying chain they're on.

Early traction validates at least parts of the thesis:

• Cash App enabled no-fee USDC transfers across Polygon, Solana, Ethereum, and Arbitrum for its roughly 59 million monthly users. The Polygon integration means a large segment of retail users now holds and moves stablecoins onchain without separately managing a self-custody wallet.
• Mastercard launched an "Agent Pay for Machines" product — designed for AI agents to autonomously authorize and execute payments — with Polygon as a founding ecosystem partner. Mastercard is also building onchain settlement infrastructure for six stablecoins across Ethereum, Solana, Base, Polygon, Arbitrum, and XRPL.
• AllUnity launched a fully reserved Swedish krona stablecoin (SEKAU) across Ethereum, Solana, Base, Tempo, and Polygon, adding to the growing roster of fiat-backed stablecoins using Polygon as a settlement rail.
• DTPPay expanded a collaboration with Polygon to route low-fee stablecoin payments across Africa, where the cost and accessibility advantages of onchain transfers are most practically significant.
• Usetoku launched stablecoin payroll for global teams on Polygon, and Spiko Finance crossed $174 million in tokenized T-bills deployed on the network.

The Trails layer — which routes cross-chain transactions through the Open Money Stack — crossed $250,000 in volume, a small number in absolute terms but indicative of an emerging integration pattern where users can fund positions on Polygon from any source chain in a single click.

POL: The Token Behind the Network

POL replaced MATIC as Polygon's native token through a migration completed at approximately 97.8% by late 2025. POL serves three functions: paying transaction fees on the PoS chain, staking to secure the network and AggLayer, and participating in governance.

The tokenomics shift from MATIC to POL was designed to support the multi-chain ambitions of Polygon 2.0. Validators can use POL to participate in securing multiple chains simultaneously — Polygon PoS, CDK chains, and eventually AggLayer-aggregated external chains — collecting fees from each. This creates a flywheel: more chains aggregated into AggLayer means more fee revenue for POL stakers, which creates economic incentive to stake, which in turn strengthens network security.

Binance supported the POL network upgrade and associated hard fork in May 2026, one marker of the migration's institutional recognition. POL can be staked natively through the Polygon staking interface, with validator selection and delegation managed onchain.

Security and Incidents

No blockchain operating at scale avoids security incidents, and Polygon's is no exception. In mid-2026, onchain investigator ZachXBT flagged a suspected exploit involving the UMA CTF Adapter contract on Polygon used by Polymarket, the prediction market platform. The incident drained over $520,000 from affected contracts, with investigators pointing to an old private key compromise rather than a smart contract vulnerability per se. The affected contracts were publicly identified; Polymarket attributed the loss to a compromised key rather than a protocol flaw.

The incident is a reminder that Polygon's open EVM environment — one of its core strengths for developer accessibility — also means that contract and key management practices remain the user's responsibility. The chain itself was not exploited; the failure was at the application layer.

Where Polygon Sits in the Broader Ecosystem

Polygon occupies an interesting position relative to Ethereum and other L2s. Unlike Optimism, Arbitrum, or Base — which are rollups that derive security directly from Ethereum — Polygon PoS is a sidechain with its own validator set. This gives it more autonomy and lower fees, but means it doesn't inherit Ethereum's consensus security in the same way.

AggLayer is the mechanism by which Polygon aims to re-establish its connection to Ethereum's security model at scale: ZK proofs submitted to Ethereum's mainnet attest to the correctness of state transitions across all aggregated chains. This means that as AggLayer matures, Polygon-ecosystem chains can claim Ethereum-equivalent finality without requiring users to be on Ethereum.

USDC is deeply embedded throughout this ecosystem — it is the dominant stablecoin on Polygon PoS, the settlement currency used in Cash App's Polygon integration, and the deposit token for several of the Open Money Stack applications described above. Circle has historically treated Polygon as a first-tier deployment target for native USDC issuance, which gives developers and integrators high confidence in liquidity depth.

Developer Experience and Ecosystem Depth

Polygon's EVM compatibility has made it a low-friction target for developers building consumer applications, DeFi protocols, and now payment integrations. The ecosystem includes established DEXes like QuickSwap (which is migrating its users off the sunsetting zkEVM), lending protocols, NFT platforms, and a growing stack of payment-native applications.

Binance's support for the POL network upgrade underscores Polygon's standing among major exchanges, and the presence of institutional projects — tokenized T-bills from Spiko, a Mastercard-backed payment layer, and fiat stablecoin issuers like AllUnity — signals that the network has crossed a threshold of perceived legitimacy for regulated financial applications.

Outlook

Polygon's near-term trajectory is defined by two bets: that AggLayer will become the dominant cross-chain interoperability layer for the broader Ethereum ecosystem, and that the Open Money Stack will attract enough fintech and enterprise integrations to position POL-secured chains as the default settlement rail for stablecoin payments.

The zkEVM shutdown clears operational overhead and signals a willingness to make hard architectural choices. The ZisK proving system, if it delivers on faster and cheaper ZK proofs, could strengthen both AggLayer and any future ZK-based chains in the ecosystem. The real test will be whether the stablecoin payment momentum — Cash App, Mastercard, DTPPay, Usetoku — translates into sustained transaction volume and fee revenue that accrues to POL stakers and makes the network self-sustaining independent of grants and partnerships.

For developers and integrators, Polygon today offers a mature EVM environment, deep stablecoin liquidity, and a payment-focused stack that is further along than most competing networks. The long-term question is whether AggLayer's interoperability vision can be executed before Ethereum's own L2 ecosystem — via shared sequencers and native interoperability — closes the same gap.