zkSync

zkSync is a family of Ethereum Layer 2 scaling networks from Matter Labs built on zero-knowledge proofs. zkSync Era is the production zkEVM rollup; the ZK Stack is the open-source framework used to deploy ZK Chains that interoperate in the Elastic Network. Developers integrate via standard JSON-RPC (with zkSync-specific extensions for paymasters, account abstraction, and L1<->L2 messaging), the zksync-ethers / zksync2-* SDKs, hardhat-zksync and foundry-zksync toolchains, the canonical Bridge, and Blockscout-based block explorers.

zkSync publishes 1 API on the APIs.io network: Era WebSocket. Tagged areas include Layer 2, Ethereum, zkEVM, ZK Rollup, and Account Abstraction.

The zkSync catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

zkSync’s developer surface includes documentation, GitHub presence, developer portal, status page, engineering blog, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub

39.2/100 thin ▬ flat Agent 25/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6

AccessFree

10 APIs

Layer 2EthereumzkEVMZK RollupAccount AbstractionPaymasterZK StackBridge

Kin Score

Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6

Composite quality — 39.2/100 · thin

Contract Quality 12.9 / 25

Developer Ergonomics 3.9 / 20

Commercial Clarity 5.8 / 20

Operational Transparency 3.4 / 13

Governance 5.7 / 12

Discoverability 7.4 / 10

Agent readiness — 25/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/zksync: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 10

Individual APIs this provider publishes, each with its own machine-readable definition.

Rate Limits 1

Documented rate limits and quota policies.

Zksync Rate Limits

2 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Get Started 1

Portal, sign-up, and the first successful call

Portal

Portal

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

SDKDocs

SDKDocs

Build 2

SDKs, sample code, and the tooling you integrate with

GitHub

GitHub

GitHubSDK

GitHubSDK

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

Status

Status

Discord

Discord

Company 4

The organization behind the API

Website

Twitter

TwitterDevs

Blog

Other 1

Properties that don't map to a standard resource type

Explorer

Explorer

Source (apis.yml)

aid: zksync
url: https://raw.githubusercontent.com/api-evangelist/zksync/refs/heads/main/apis.yml
name: zkSync
kind: company
description: zkSync is a family of Ethereum Layer 2 scaling networks from Matter Labs built on zero-knowledge proofs. zkSync
  Era is the production zkEVM rollup; the ZK Stack is the open-source framework used to deploy ZK Chains that interoperate
  in the Elastic Network. Developers integrate via standard JSON-RPC (with zkSync-specific extensions for paymasters, account
  abstraction, and L1<->L2 messaging), the zksync-ethers / zksync2-* SDKs, hardhat-zksync and foundry-zksync toolchains, the
  canonical Bridge, and Blockscout-based block explorers.
accessModel:
  pricing: free
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Free
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/zksync.png
tags:
- Layer 2
- Ethereum
- zkEVM
- ZK Rollup
- Account Abstraction
- Paymaster
- ZK Stack
- Bridge
created: '2026-05-23'
modified: '2026-05-29'
specificationVersion: '0.19'
apis:
- aid: zksync:era-mainnet-rpc
  name: zkSync Era Mainnet JSON-RPC
  description: JSON-RPC endpoint for zkSync Era mainnet (chain ID 324). Implements standard eth_* methods plus zks_* extensions
    for L1 batch info, fee estimation, bridge contracts, paymaster params, token addresses, and proof generation status.
  humanURL: https://docs.zksync.io/build/api-reference/api
  baseURL: https://mainnet.era.zksync.io
  tags:
  - JSON-RPC
  - Mainnet
  - zkSync Era
  properties:
  - type: Documentation
    url: https://docs.zksync.io/build/api-reference/api
- aid: zksync:era-sepolia-rpc
  name: zkSync Era Sepolia JSON-RPC
  description: JSON-RPC endpoint for the zkSync Era Sepolia testnet (chain ID 300) used for development, contract deployment,
    and integration testing.
  humanURL: https://docs.zksync.io/build/api-reference/api
  baseURL: https://sepolia.era.zksync.dev
  tags:
  - JSON-RPC
  - Testnet
  - Sepolia
  properties:
  - type: Documentation
    url: https://docs.zksync.io/build/api-reference/api
- aid: zksync:era-websocket
  name: zkSync Era WebSocket
  description: WebSocket variant of the zkSync Era JSON-RPC endpoint for real-time eth_* subscriptions (newHeads, logs, pendingTransactions)
    and zks_* subscriptions.
  humanURL: https://docs.zksync.io/build/api-reference/api
  baseURL: wss://mainnet.era.zksync.io/ws
  tags:
  - WebSocket
  - Subscriptions
  - Real-Time
  properties:
  - type: Documentation
    url: https://docs.zksync.io/build/api-reference/api
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/zksync/refs/heads/main/asyncapi/zksync-asyncapi.yml
- aid: zksync:zksync-ethers
  name: zksync-ethers SDK
  description: TypeScript SDK built on top of ethers.js that adds zkSync-specific providers, signers, paymaster helpers, account-abstraction
    utilities, deposit and withdrawal flows, and contract factories.
  humanURL: https://sdk.zksync.io/js/ethers
  baseURL: https://github.com/zksync-sdk/zksync-ethers
  tags:
  - SDK
  - TypeScript
  - Ethers
  properties:
  - type: Documentation
    url: https://sdk.zksync.io/js/ethers
  - type: Repository
    url: https://github.com/zksync-sdk/zksync-ethers
- aid: zksync:zksync-go
  name: zksync2-go SDK
  description: Official Go SDK for zkSync Era with support for transactions, EIP-712 typed data, paymasters, deposits, and
    withdrawals.
  humanURL: https://sdk.zksync.io/go
  baseURL: https://github.com/zksync-sdk/zksync2-go
  tags:
  - SDK
  - Go
  properties:
  - type: Documentation
    url: https://sdk.zksync.io/go
  - type: Repository
    url: https://github.com/zksync-sdk/zksync2-go
- aid: zksync:hardhat-zksync
  name: hardhat-zksync
  description: Suite of Hardhat plugins for zkSync development — compile, deploy, verify, run local nodes, upgrade contracts,
    and integrate with the zkVM toolchain.
  humanURL: https://docs.zksync.io/build/tooling/hardhat
  baseURL: https://github.com/matter-labs/hardhat-zksync
  tags:
  - Hardhat
  - Plugin
  - Tooling
  properties:
  - type: Documentation
    url: https://docs.zksync.io/build/tooling/hardhat
  - type: Repository
    url: https://github.com/matter-labs/hardhat-zksync
- aid: zksync:foundry-zksync
  name: foundry-zksync
  description: Fork of Foundry (forge / cast / anvil) with first-class zkSync support for compiling, testing, scripting, and
    deploying contracts to zkSync Era and ZK-Stack chains.
  humanURL: https://docs.zksync.io/build/tooling/foundry/overview
  baseURL: https://github.com/matter-labs/foundry-zksync
  tags:
  - Foundry
  - Tooling
  - zkEVM
  properties:
  - type: Documentation
    url: https://docs.zksync.io/build/tooling/foundry/overview
  - type: Repository
    url: https://github.com/matter-labs/foundry-zksync
- aid: zksync:bridge
  name: zkSync Era Bridge
  description: Canonical cross-chain bridge between Ethereum L1 and zkSync Era for ETH and ERC-20 tokens. The Portal also
    exposes bridging across ZK Chains in the Elastic Network.
  humanURL: https://portal.zksync.io/bridge
  baseURL: https://portal.zksync.io/bridge
  tags:
  - Bridge
  - L1
  - L2
  - Canonical
  properties:
  - type: Documentation
    url: https://docs.zksync.io/build/developer-reference/bridging
  - type: App
    url: https://portal.zksync.io/bridge
- aid: zksync:zk-stack
  name: ZK Stack
  description: Open-source framework (zksync-era + era-contracts) for deploying customizable ZK Chains that share liquidity
    and security through the Elastic Network shared bridge.
  humanURL: https://docs.zksync.io/zk-stack
  baseURL: https://github.com/matter-labs/zksync-era
  tags:
  - ZK Stack
  - Elastic Network
  - Appchains
  properties:
  - type: Documentation
    url: https://docs.zksync.io/zk-stack
  - type: Repository
    url: https://github.com/matter-labs/zksync-era
- aid: zksync:explorer-api
  name: zkSync Era Block Explorer API
  description: Official Blockscout-based block explorer for zkSync Era with REST API exposing blocks, batches, transactions,
    addresses, contracts, and token data.
  humanURL: https://explorer.zksync.io
  baseURL: https://block-explorer-api.mainnet.zksync.io
  tags:
  - Block Explorer
  - API
  - Blockscout
  properties:
  - type: Website
    url: https://explorer.zksync.io
common:
- type: DomainSecurity
  url: security/zksync-domain-security.yml
- type: Website
  url: https://zksync.io
- type: Documentation
  url: https://docs.zksync.io
- type: SDKDocs
  url: https://sdk.zksync.io
- type: GitHub
  url: https://github.com/matter-labs
- type: GitHubSDK
  url: https://github.com/zksync-sdk
- type: Portal
  url: https://portal.zksync.io
- type: Explorer
  url: https://explorer.zksync.io
- type: Status
  url: https://uptime.com/s/zksync
- type: Twitter
  url: https://x.com/zksync
- type: TwitterDevs
  url: https://x.com/zksyncDevs
- type: Discord
  url: https://join.zksync.dev
- type: Blog
  url: https://zksync.mirror.xyz
integrations:
- name: Ethereum
- name: Alchemy
- name: QuickNode
- name: Infura
- name: Chainstack
- name: The Graph
- name: Blockscout
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

zkSync

Kin Score

APIs 10

zkSync Era Mainnet JSON-RPC

zkSync Era Sepolia JSON-RPC

zkSync Era WebSocket

zksync-ethers SDK

zksync2-go SDK

hardhat-zksync

foundry-zksync

zkSync Era Bridge

ZK Stack

zkSync Era Block Explorer API

Pricing Plans 1

Zksync Plans Pricing

Rate Limits 1

Zksync Rate Limits

FinOps 1

Zksync Finops

Event Specifications 1

zkSync Era WebSocket JSON-RPC PubSub API

Spectral Rules 1

zkSync API Rules

Security Posture 1

Zksync Domain Security

Resources