Templates

Every template is a standalone Bun monorepo you can clone and run. They share one flat layout, so moving between them is mostly a matter of which packages are present.

Each page below is generated from that template's own README, so what you read here is what ships in the repository.

Starting points

The smallest complete examples. Read these first.

Template	What it shows
minimal	The smallest complete Effectstream app: one EVM contract event becomes one validated command, one state transition, and one database row.
hex-battle	A turn-based hex-grid tactics game whose rules live in one standalone package, imported unchanged by both the sync node and the browser client.

Multi-chain

Templates that sync from, or settle across, more than one chain.

Template	What it shows
evm-midnight-v2	Multi-chain template that joins public ERC-721 ownership on EVM with metadata disclosed by a Midnight ZK circuit into a single rollup state.
evm-cardano	Syncs an EVM chain and a Cardano devnet side by side into one deterministic state machine, and shows both event streams in a single dashboard.
zk-cardano	Public stake on Cardano decides who may vote; private ZK ballots on Midnight decide the outcome, with one state machine reading both chains.
night-bitcoin-v2	Trustless BTC ↔ Midnight swaps with no bridge: users publish ERC-7683 intents, competing fillers settle both legs, and the node arbitrates.
multi-chain-token-transfer (legacy — not installable)	A unified ERC1155 balance across a local EVM chain and Midnight, moved by a custom sync primitive and a batcher that writes to both chains.

Games

Turn-based and real-time games built on the state machine.

Template	What it shows
chess-v2	A complete turn-based chess game on an EVM chain: lobbies, matchmaking, move validation, chess clocks and ELO, driven by scheduled state transitions.
world-map-2d	A 10×10 tile world where the map lives in database rows, so grammar bounds and a foreign key do all the validation and each transition is one SQL write.
rock-paper-scissors (legacy — not installable)	A best-of-N Rock Paper Scissors game where both players commit moves for the same round and the node resolves them deterministically, with timeout forfeits.
dice (legacy — not installable)	A two-player turn-based dice game whose rolls are never stored: the node and every browser re-derive them from the block seed and the recorded moves.
shinkai-v2	An AI-judged RPG where an off-chain LLM writes the story but never touches the token ledger, which stays deterministic on an EVM L2.

Chain-specific

Focused examples of one chain's primitives and tooling.

Template	What it shows
solana-starter	A gasless Solana counter dApp: the user signs, a fee-payer batcher pays, and the sync node indexes the program's own log lines into Postgres.
cardano-delegation	Indexes native Cardano stake-delegation certificates into a live dashboard — no smart contract, no batcher, and a node API that only ever answers GET.
projected-nft-preorder	Runnable PRC-2 reference for Cardano: locks an NFT at the Hololocker Plutus script and indexes the Lock → Unlocking → Claim lifecycle into Postgres.
zswap-da	A React frontend for atomic token swaps on Midnight, where open offers live as Celestia data-availability blobs rather than in an on-chain order book.

Applications

Commerce, batching and other non-game applications.

Template	What it shows
preorder	A multi-chain presale where one product catalog is sold for EVM ETH, an ERC-20, or Cardano ADA, and every payment lands in one order book.
batcher-validations	Shows how to reject inputs at the batcher before they are queued, by wrapping a blockchain adapter with a custom validateInput hook.

Also in this section

Page	What it covers
Wallet integrations	Every supported wallet mode, demonstrated by the e2e/wallets-ui app.
Tarochi (case study)	A production game built on Effectstream. Not a template in this repository.