Matter Labs

Matter Labs is the company behind ZKsync, a family of zero-knowledge (ZK) rollup Layer 2 scaling solutions for Ethereum. Its flagship network, ZKsync Era, is an EVM-compatible ZK rollup that inherits Ethereum security while offering low fees and high throughput. For developers ZKsync Era exposes a public, Ethereum-compatible JSON-RPC API (the standard eth_* namespace) extended with a ZKsync-specific zks_* namespace covering L1 batches, L1<->L2 bridging, fee and gas-per-pubdata estimation, token discovery, and Merkle proofs, plus a WebSocket pub/sub surface. First-party SDKs ship for JavaScript/TypeScript (zksync-ethers), Python (zksync2), and Go (zksync2-go), alongside a zksync-cli developer tool and native account-abstraction support. Matter Labs also builds the ZK Stack for launching sovereign ZK chains. The company is backed by a16z.

Matter Labs publishes 1 API on the APIs.io network. Tagged areas include Company, Blockchain, Ethereum, Layer 2, and Zero-Knowledge Proofs.

The Matter Labs catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Matter Labs’ developer surface includes documentation, API reference, quickstart, CLI, authentication, and 16 more developer resources.

🌐 Visit website 📡 Source on GitHub

35.9/100 thin ▬ flat Agent 19/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

1 APIs

Company Blockchain Ethereum Layer 2 Zero-Knowledge Proofs Rollup JSON-RPC Web3 Cryptography Scaling

Kin Score

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

Composite quality — 35.9/100 · thin

Contract Quality 10.4 / 25

Developer Ergonomics 12.9 / 20

Access Clarity 4.2 / 20

Operational Transparency 0.3 / 13

Contract Governance 0.5 / 12

Discoverability 7.6 / 10

Agent readiness — 19/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 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

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.

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/matter-labs: 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 1

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

ZKsync Era JSON-RPC API

Ethereum-compatible JSON-RPC 2.0 API for the ZKsync Era ZK rollup. Standard eth_* methods plus the ZKsync-specific zks_* namespace (batches, bridging, fee estimation, proofs) ov...

Event Specifications 1

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

ZKsync Era Pub/Sub (WebSocket) API

Generated from the ZKsync Era pub-sub JSON-RPC documentation. ZKsync Era supports the Ethereum-style eth_subscribe / eth_unsubscribe subscription model over WebSocket. This is a...

ASYNCAPI

Security Posture 2

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

Matter Labs Authentication

none · 1 scheme

SECURITY

Matter Labs Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

Quickstart

Quickstart

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

AsyncAPI

AsyncAPI

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

X-MCPServerCandidate

X-MCPServerCandidate

LLMsTxt

LLMsTxt

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

Conventions

Conformance

ErrorCatalog

Lifecycle

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

SDKs

CLI

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: matter-labs
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 12
  pass: local-v1
name: Matter Labs
description: Matter Labs is the company behind ZKsync, a family of zero-knowledge (ZK) rollup Layer 2 scaling solutions for
  Ethereum. Its flagship network, ZKsync Era, is an EVM-compatible ZK rollup that inherits Ethereum security while offering
  low fees and high throughput. For developers ZKsync Era exposes a public, Ethereum-compatible JSON-RPC API (the standard
  eth_* namespace) extended with a ZKsync-specific zks_* namespace covering L1 batches, L1<->L2 bridging, fee and gas-per-pubdata
  estimation, token discovery, and Merkle proofs, plus a WebSocket pub/sub surface. First-party SDKs ship for JavaScript/TypeScript
  (zksync-ethers), Python (zksync2), and Go (zksync2-go), alongside a zksync-cli developer tool and native account-abstraction
  support. Matter Labs also builds the ZK Stack for launching sovereign ZK chains. The company is backed by a16z.
url: https://raw.githubusercontent.com/api-evangelist/matter-labs/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
x-tier: stub
x-tier-reason: portfolio-lead
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://avatars.githubusercontent.com/matter-labs
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- Blockchain
- Ethereum
- Layer 2
- Zero-Knowledge Proofs
- Rollup
- JSON-RPC
- Web3
- Cryptography
- Scaling
apis:
- name: ZKsync Era JSON-RPC API
  description: Ethereum-compatible JSON-RPC 2.0 API for the ZKsync Era ZK rollup. Standard eth_* methods plus the ZKsync-specific
    zks_* namespace (batches, bridging, fee estimation, proofs) over HTTPS POST, with a WebSocket pub/sub surface for subscriptions.
  humanURL: https://docs.zksync.io/zksync-protocol/api
  baseURL: https://mainnet.era.zksync.dev
  tags:
  - JSON-RPC
  - Blockchain
  - Ethereum
  - Layer 2
  properties:
  - type: Documentation
    url: https://docs.zksync.io/zksync-protocol/api
  - type: APIReference
    url: https://docs.zksync.io/zksync-protocol/api/zks-rpc
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/matter-labs-domain-security.yml
- type: Website
  url: https://matterlabs.com/
- type: DeveloperPortal
  url: https://docs.zksync.io/
- type: Documentation
  url: https://docs.zksync.io/
- type: APIReference
  url: https://docs.zksync.io/zksync-protocol/api
- type: Quickstart
  url: https://docs.zksync.io/zksync-network/quick-start/build-a-frontend
- type: GitHubOrganization
  url: https://github.com/matter-labs
- type: TermsOfService
  url: https://www.zksync.io/terms
- type: PrivacyPolicy
  url: https://www.zksync.io/privacy
- type: Packages
  url: packages/matter-labs-packages.yml
- type: SDKs
  url: packages/matter-labs-packages.yml
- type: CLI
  url: cli/matter-labs-cli.yml
- type: Authentication
  url: authentication/matter-labs-authentication.yml
- type: Conventions
  url: conventions/matter-labs-conventions.yml
- type: Conformance
  url: conformance/matter-labs-conformance.yml
- type: ErrorCatalog
  url: errors/matter-labs-problem-types.yml
- type: Lifecycle
  url: lifecycle/matter-labs-lifecycle.yml
- type: WellKnown
  url: well-known/matter-labs-well-known.yml
- type: X-MCPServerCandidate
  url: mcp/matter-labs-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: LLMsTxt
  url: llms/matter-labs-llms.txt
- type: AsyncAPI
  url: asyncapi/matter-labs-pubsub-asyncapi.yml

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