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

Quick links, and the external references these docs draw on.

Pay3 Wallet

Launch the live multi-chain wallet.

Pay3 website

The main site, pay3.space.

Further reading

External projects and libraries referenced elsewhere in these docs, credited here rather than passed off as Pay3's own.

Monad docs

Consensus and parallel/async execution design — one reference point for the BFT + parallel-execution approach.

MegaETH research

Real-time execution engine deep dive — an L2, but the execution-layer techniques transfer directly to L1 design.

rust-libp2p

The networking library Pay3's planned P2P layer is being built on.

revm

The Rust EVM implementation Pay3's execution layer is being built on.

Cosmos SDK docs

One of the two realistic starting frameworks considered — batteries-included consensus, P2P, and IBC.

Substrate docs

The other — modular Rust "pallets", compiles to WASM, Polkadot ecosystem.