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 14 more developer resources.

🌐 Visit website 📡 Source on GitHub

43.4/100 developing ▬ flat Agent 17/100 agent aware self hosted · Apache-2.0 Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFree

10 APIs

Layer 2 Ethereum zkEVMZK-RollupAccount Abstraction PaymasterZK StackBridge

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 43.4/100 · developing

Contract Quality 9.6 / 23

Developer Ergonomics 4.3 / 18

Access Clarity 5.2 / 18

Operational Transparency 6.2 / 12

Contract Governance 1.5 / 11

Discoverability 6.7 / 9

Open Source Surface 10.0 / 10

Agent readiness — 17/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 90 points between them, because the conditional facet above carries the other 10. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 90% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. 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. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 10

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

zkSync Era Mainnet JSON-RPC

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 p...

zkSync Era Sepolia JSON-RPC

JSON-RPC endpoint for the zkSync Era Sepolia testnet (chain ID 300) used for development, contract deployment, and integration testing.

zkSync Era WebSocket

WebSocket variant of the zkSync Era JSON-RPC endpoint for real-time eth_* subscriptions (newHeads, logs, pendingTransactions) and zks_* subscriptions.

zksync-ethers SDK

TypeScript SDK built on top of ethers.js that adds zkSync-specific providers, signers, paymaster helpers, account-abstraction utilities, deposit and withdrawal flows, and contra...

zksync2-go SDK

Official Go SDK for zkSync Era with support for transactions, EIP-712 typed data, paymasters, deposits, and withdrawals.

hardhat-zksync

Suite of Hardhat plugins for zkSync development — compile, deploy, verify, run local nodes, upgrade contracts, and integrate with the zkVM toolchain.

foundry-zksync

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.

zkSync Era Bridge

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.

ZK Stack

Open-source framework (zksync-era + era-contracts) for deploying customizable ZK Chains that share liquidity and security through the Elastic Network shared bridge.

zkSync Era Block Explorer API

Official Blockscout-based block explorer for zkSync Era with REST API exposing blocks, batches, transactions, addresses, contracts, and token data.

Scroll for all 10

Pricing Plans 1

Published pricing tiers and plan structures.

Zksync Plans Pricing

1 plans

PLANS

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.

Zksync Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

zkSync Era WebSocket JSON-RPC PubSub API

AsyncAPI description for the zkSync Era WebSocket JSON-RPC PubSub endpoint. zkSync Era is fully compatible with Geth's pubsub API, except for the `syncing` subscription. Clients...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

zkSync API Rules

6 rules · 1 errors 4 warnings 1 info

SPECTRAL

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Zksync Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

Portal

Portal

Documentation 3

Reference material describing how the API behaves

ContributionGuide

ContributionGuide

Documentation

Documentation

SDKDocs

SDKDocs

Build 3

SDKs, sample code, and the tooling you integrate with

CodeOfConduct

CodeOfConduct

GitHub

GitHub

GitHubSDK

GitHubSDK

Access & Security 2

Authentication, authorization, and security posture

SecurityPolicy

SecurityPolicy

DomainSecurity

DomainSecurity

Operate 4

Status, limits, changes, and where to get help

IssueTracker

Releases

Status

Discord

Commercial 1

Pricing, plans, and the legal terms of use

License

License

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.
deliveryModel:
  model: self-hosted
  license: Apache-2.0
  open_source: true
  commercial: false
  callable_host: false
  label: Self-hosted open source · you run it yourself
  confidence: high
  source:
  - license
  generated: '2026-08-28'
  method: derived
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
tags_raw:
- Layer 2
- Ethereum
- zkEVM
- ZK Rollup
- Account Abstraction
- Paymaster
- ZK Stack
- Bridge
created: '2026-05-23'
modified: '2026-05-29'
specificationVersion: '0.23'
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
  - Subscription
  - Real-Time
  tags_raw:
  - 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
  - Blockscout
  tags_raw:
  - Block Explorer
  - API
  - Blockscout
  properties:
  - type: Website
    url: https://explorer.zksync.io
common:
- type: IssueTracker
  url: https://github.com/zksync-sdk/zksync-ethers/issues
- type: Releases
  url: https://github.com/zksync-sdk/zksync-ethers/releases
- type: SecurityPolicy
  url: https://github.com/zksync-sdk/zksync-ethers/blob/main/SECURITY.md
- type: CodeOfConduct
  url: https://github.com/zksync-sdk/zksync-ethers/blob/main/CODE_OF_CONDUCT.md
- type: ContributionGuide
  url: https://github.com/zksync-sdk/zksync-ethers/blob/main/.github/CONTRIBUTING.md
- type: License
  name: Apache-2.0
  url: https://github.com/zksync-sdk/zksync-ethers/blob/main/LICENSE
- 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

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