# Matter Labs (ZKsync)

> Matter Labs is the company behind ZKsync, a family of zero-knowledge (ZK) rollup Layer 2 scaling solutions for Ethereum. ZKsync Era is an EVM-compatible ZK rollup exposing a public Ethereum-compatible JSON-RPC API (eth_* namespace) extended with ZKsync-specific methods (zks_* namespace) for batches, L1<->L2 bridging, fee estimation and proofs. This llms.txt was generated by the API Evangelist enrichment pipeline from the public developer surface (docs.zksync.io) and package registries; it is not a provider-published file.

## APIs
- [ZKsync Era JSON-RPC API](https://docs.zksync.io/zksync-protocol/api): Ethereum-compatible JSON-RPC 2.0 over HTTPS POST / WebSocket. Mainnet: https://mainnet.era.zksync.dev (chain id 324). Sepolia testnet: https://sepolia.era.zksync.dev (chain id 300).
- [Ethereum RPC namespace](https://docs.zksync.io/zksync-protocol/api/ethereum-rpc): Standard eth_* methods.
- [ZKsync (zks) RPC namespace](https://docs.zksync.io/zksync-protocol/api/zks-rpc): zks_estimateFee, zks_getBlockDetails, zks_getTransactionDetails, zks_getBridgeContracts, zks_getL1BatchDetails, zks_getConfirmedTokens, and more.
- [Debug RPC namespace](https://docs.zksync.io/zksync-protocol/api/debug-rpc): tracing methods.
- [Pub/Sub RPC (WebSocket)](https://docs.zksync.io/zksync-protocol/api/pub-sub-rpc): eth_subscribe / eth_unsubscribe (newHeads, logs, newPendingTransactions).
- [API conventions](https://docs.zksync.io/zksync-protocol/api/conventions): JSON-RPC 2.0 envelope, hex encoding (EIP-1474), batch requests.

## SDKs
- [zksync-ethers (JavaScript/TypeScript)](https://www.npmjs.com/package/zksync-ethers): ethers.js v6 extension. Official.
- [zksync2 (Python)](https://pypi.org/project/zksync2/): Official Python SDK.
- [zksync2-go (Go)](https://pkg.go.dev/github.com/zksync-sdk/zksync2-go): Official Go SDK.
- [zksync-cli](https://www.npmjs.com/package/zksync-cli): CLI to scaffold, develop and interact with ZKsync.
- [zksync-sso](https://github.com/matter-labs/zksync-sso): Smart-account / passkey authentication SDK.

## Docs
- [Developer Documentation](https://docs.zksync.io/): ZKsync developer portal.
- [Quickstart](https://docs.zksync.io/zksync-network/quick-start/build-a-frontend): Build a frontend on ZKsync.
- [Custom tooling](https://docs.zksync.io/zksync-network/zksync-era/custom-tooling): Integrating existing Ethereum tooling.

## Company
- [Matter Labs](https://matterlabs.com/): Company site. "Practical applications of Zero-Knowledge Proofs."
- [ZKsync](https://www.zksync.io/): Product site.
- [GitHub: matter-labs](https://github.com/matter-labs): 232+ public repositories.
- [GitHub: zksync-sdk](https://github.com/zksync-sdk): Official SDK organization.
- [Careers](https://matterlabs.com/careers): Matter Labs careers.
- [Terms of Service](https://www.zksync.io/terms)
- [Privacy](https://www.zksync.io/privacy)