Pay3 L1 is in active development — a single-node testnet prototype runs today, see Run It Yourself.
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Getting started

Introduction

Pay3 is an upcoming Layer 1 blockchain, designed for high throughput, deterministic finality, and fees low enough to stop thinking about. This is where its architecture and design decisions are documented as they're made.

Pay3 L1 is in active development. Nothing in these docs describes a live, audited network — it describes the architecture being built and the reasoning behind it. Figures like throughput or finality targets are goals, not measured results, and are labeled as such throughout.

What is Pay3

Every blockchain — Bitcoin, Ethereum, Solana, or Pay3 — is really five cooperating subsystems running on every node: a network layer for discovering peers and gossiping data, a consensus layer for agreeing on transaction order, an execution layer for running transactions, a state layer for persisting the result, and an RPC layer for letting wallets and apps talk to all of it. Pay3's design starts from that same foundation, with two explicit priorities layered on top: throughput and deterministic, sub-second finality, achieved without giving up EVM compatibility.

EVM compatibility matters in practice, not just in theory: it means wallets, tooling, and contracts written for Ethereum work against Pay3 with little to no changes. It's also why the Pay3 Wallet — a real, working multi-chain wallet — could be built and shipped well before the L1 itself, using the exact same RPC patterns Pay3 is being designed around.

What you can use today

While the L1 is being built, two things are already available: a wallet, and — once published — a Chrome extension.

Pay3 Wallet

Self-custody, multi-chain, live today. Launch it at app.pay3.space.

Chrome Extension

The Pay3 Wallet as a browser extension — coming soon.

How to read these docs

Start with The Five Layers for the mental model, then Transaction Lifecycle to see how a transfer actually moves from a wallet to finality. Design Goals and Tech Stack cover the harder engineering trade-offs — speed vs. decentralization, and why Pay3 is being built in Rust. Roadmap shows where things actually stand right now.