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

36.4/100 thin ▬ flat Agent 17/100 agent aware Front door AI 1/6 silent saas Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0

1 APIs

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

Kin Score

Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0

Composite quality — 36.4/100 · thin

Contract Quality 8.3 / 21

Developer Ergonomics 10.9 / 17

Access Clarity 3.6 / 17

Operational Transparency 0.3 / 11

Contract Governance 0.5 / 10

Discoverability 6.2 / 9

Regulatory Posture 3.7 / 15

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 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

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct 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 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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/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 →

Standards implemented 1

Interfaces this provider implements that became standards by being copied rather than ratified. Each is profiled by the API Commons, and the evidence column says how the claim was established — not that it was made.

The Ethereum JSON-RPC Interface

prose — states compatibility; nothing published to check it against

22 core of 78 operations graded · api-commons/blockchain

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
- Real-Time
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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