OpenZeppelin

OpenZeppelin is a Web3 security platform providing tools for secure smart contract development, deployment, monitoring, and automation. The platform includes OpenZeppelin Contracts (battle-tested Solidity libraries), Defender (a developer security platform for auditing, deploying, and operating blockchain applications), the open-source OpenZeppelin Relayer for transaction relay infrastructure across EVM, Solana, and Stellar networks, and OpenZeppelin Monitor for real-time on-chain activity detection and alerting. Defender is sunsetting on July 1, 2026, with users migrating to the open-source Relayer and Monitor projects.

OpenZeppelin publishes 7 APIs on the APIs.io network, including Health API, Metrics API, Networks API, and 4 more. Tagged areas include Web3, Smart Contracts, Blockchain, Security, and Ethereum.

The OpenZeppelin catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

OpenZeppelin’s developer surface includes authentication, documentation, GitHub presence, engineering blog, product news, status page, signup flow, and 12 more developer resources.

🌐 Visit website 📡 Source on GitHub

51.8/100 developing ▬ flat Agent 44/100 agent ready Full breakdown ↓
scored 2026-07-28 · rubric v0.6

AccessFreemiumSelf serve⚡ Free to try

9 APIs

Web3Smart ContractsBlockchainSecurityEthereumDeFiSolidityRelayerMonitoringAuditing

Kin Score

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

Composite quality — 51.8/100 · developing

Contract Quality 14.1 / 25

Developer Ergonomics 4.3 / 20

Commercial Clarity 13.7 / 20

Operational Transparency 6.2 / 13

Governance 7.0 / 12

Discoverability 6.5 / 10

Agent readiness — 44/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 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/openzeppelin: 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 9

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

Rate Limits 1

Documented rate limits and quota policies.

Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

JSON Schema 3

Standalone JSON Schema definitions for this provider's data models.

Examples 3

Example request and response payloads for these APIs.

Get Started 1

Portal, sign-up, and the first successful call

Signup

Signup

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHub

GitHub

Access & Security 4

Authentication, authorization, and security posture

TrustCenter

DomainSecurity

Authentication

Security

Operate 4

Status, limits, changes, and where to get help

Forums

OpenSourceStack

Discord

Status

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 5

The organization behind the API

Website

Blog

News

Twitter

LinkedIn

Source (apis.yml)

name: OpenZeppelin
description: 'OpenZeppelin is a Web3 security platform providing tools for secure smart contract development, deployment,
  monitoring, and automation. The platform includes OpenZeppelin Contracts (battle-tested Solidity libraries), Defender (a
  developer security platform for auditing, deploying, and operating blockchain applications), the open-source OpenZeppelin
  Relayer for transaction relay infrastructure across EVM, Solana, and Stellar networks, and OpenZeppelin Monitor for real-time
  on-chain activity detection and alerting. Defender is sunsetting on July 1, 2026, with users migrating to the open-source
  Relayer and Monitor projects.

  '
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://www.openzeppelin.com/hubfs/openzeppelin-logo.png
tags:
- Web3
- Smart Contracts
- Blockchain
- Security
- Ethereum
- DeFi
- Solidity
- Relayer
- Monitoring
- Auditing
created: '2026-06-13'
modified: '2026-06-13'
url: https://raw.githubusercontent.com/api-evangelist/openzeppelin/refs/heads/main/apis.yml
specificationVersion: '0.19'
apis:
- name: OpenZeppelin Monitor API
  description: 'OpenZeppelin Monitor is an open-source blockchain monitoring service that watches for specific on-chain activities
    and triggers notifications based on configurable conditions. It supports real-time monitoring of EVM-compatible networks,
    Solana, and Stellar with flexible match conditions on functions, events, and transactions. Notification channels include
    Slack, Discord, Email, Telegram, Webhooks, and custom scripts. Configurable via JSON files with cron-based scheduling
    and optional metrics server on port 8081.

    '
  image: https://www.openzeppelin.com/hubfs/openzeppelin-logo.png
  humanURL: https://docs.openzeppelin.com/monitor
  baseURL: http://localhost:8081
  tags:
  - Monitor
  - Blockchain
  - Alerts
  - Events
  - Smart Contracts
  - Notifications
  - Open Source
  - On-chain
  properties:
  - type: Documentation
    url: https://docs.openzeppelin.com/monitor
  - type: GettingStarted
    url: https://docs.openzeppelin.com/monitor/quickstart
  - type: GitHubRepository
    url: https://github.com/OpenZeppelin/openzeppelin-monitor
  - type: Plans
    url: plans/plans.yml
  - type: RateLimits
    url: rate-limits/rate-limits.yml
  - type: FinOps
    url: finops/finops.yml
  contact:
  - FN: OpenZeppelin Community
    url: https://github.com/OpenZeppelin/openzeppelin-monitor/issues
    email: ''
- name: OpenZeppelin Contracts API Reference
  description: 'The OpenZeppelin Contracts library provides a comprehensive collection of modular, reusable, and secure Solidity
    smart contracts for building decentralized applications. The API reference covers ERC token standards (ERC-20, ERC-721,
    ERC-1155), access control, governance, security utilities (reentrancy guards, pausable), upgradeable proxy patterns, and
    cryptographic primitives. Used by thousands of blockchain projects as the industry standard for secure smart contract
    development.

    '
  image: https://www.openzeppelin.com/hubfs/openzeppelin-logo.png
  humanURL: https://docs.openzeppelin.com/contracts
  baseURL: https://docs.openzeppelin.com/contracts
  tags:
  - Smart Contracts
  - Solidity
  - ERC-20
  - ERC-721
  - ERC-1155
  - Governance
  - Security
  - Open Source
  properties:
  - type: Documentation
    url: https://docs.openzeppelin.com/contracts
  - type: APIReference
    url: https://docs.openzeppelin.com/contracts/5.x/api/access
  - type: GitHubRepository
    url: https://github.com/OpenZeppelin/openzeppelin-contracts
  - type: NPMPackage
    url: https://www.npmjs.com/package/@openzeppelin/contracts
  - type: Plans
    url: plans/plans.yml
  - type: RateLimits
    url: rate-limits/rate-limits.yml
  - type: FinOps
    url: finops/finops.yml
  contact:
  - FN: OpenZeppelin Community
    url: https://forum.openzeppelin.com/
    email: ''
- aid: openzeppelin:openzeppelin-health-api
  name: OpenZeppelin Health API
  description: Health is responsible for showing the health of the relayers.
  humanURL: https://docs.openzeppelin.com/defender/sdk
  baseURL: https://defender-api.openzeppelin.com/v2
  tags:
  - Health
  properties:
  - type: OpenAPI
    url: openapi/openzeppelin-health-api-openapi.yml
  - type: Documentation
    url: https://docs.openzeppelin.com/defender/sdk
  - type: Authentication
    url: https://docs.openzeppelin.com/defender/settings
  - type: SDKs
    url: https://www.npmjs.com/package/@openzeppelin/defender-sdk
  - type: GitHubRepository
    url: https://github.com/OpenZeppelin/defender-sdk
  - type: ChangeLog
    url: https://docs.openzeppelin.com/defender
  - type: Plans
    url: plans/plans.yml
  - type: RateLimits
    url: rate-limits/rate-limits.yml
  - type: FinOps
    url: finops/finops.yml
  - type: Documentation
    url: https://docs.openzeppelin.com/relayer
  - type: OpenAPISpec
    url: https://raw.githubusercontent.com/api-evangelist/openzeppelin/main/openapi/openzeppelin-relayer-openapi.json
  - type: GitHubRepository
    url: https://github.com/OpenZeppelin/openzeppelin-relayer
  - type: SDKs
    url: https://github.com/OpenZeppelin/openzeppelin-relayer-sdk
  - type: Configuration
    url: https://docs.openzeppelin.com/relayer/configuration
- aid: openzeppelin:openzeppelin-metrics-api
  name: OpenZeppelin Metrics API
  description: Metrics are responsible for showing the metrics related to the relayers.
  humanURL: https://docs.openzeppelin.com/defender/sdk
  baseURL: https://defender-api.openzeppelin.com/v2
  tags:
  - Metrics
  properties:
  - type: OpenAPI
    url: openapi/openzeppelin-metrics-api-openapi.yml
  - type: Documentation
    url: https://docs.openzeppelin.com/defender/sdk
  - type: Authentication
    url: https://docs.openzeppelin.com/defender/settings
  - type: SDKs
    url: https://www.npmjs.com/package/@openzeppelin/defender-sdk
  - type: GitHubRepository
    url: https://github.com/OpenZeppelin/defender-sdk
  - type: ChangeLog
    url: https://docs.openzeppelin.com/defender
  - type: Plans
    url: plans/plans.yml
  - type: RateLimits
    url: rate-limits/rate-limits.yml
  - type: FinOps
    url: finops/finops.yml
  - type: Documentation
    url: https://docs.openzeppelin.com/relayer
  - type: OpenAPISpec
    url: https://raw.githubusercontent.com/api-evangelist/openzeppelin/main/openapi/openzeppelin-relayer-openapi.json
  - type: GitHubRepository
    url: https://github.com/OpenZeppelin/openzeppelin-relayer
  - type: SDKs
    url: https://github.com/OpenZeppelin/openzeppelin-relayer-sdk
  - type: Configuration
    url: https://docs.openzeppelin.com/relayer/configuration
- aid: openzeppelin:openzeppelin-networks-api
  name: OpenZeppelin Networks API
  description: Networks represent blockchain network configurations including RPC endpoints and network-specific settings.
  humanURL: https://docs.openzeppelin.com/defender/sdk
  baseURL: https://defender-api.openzeppelin.com/v2
  tags:
  - Networks
  properties:
  - type: OpenAPI
    url: openapi/openzeppelin-networks-api-openapi.yml
  - type: Documentation
    url: https://docs.openzeppelin.com/defender/sdk
  - type: Authentication
    url: https://docs.openzeppelin.com/defender/settings
  - type: SDKs
    url: https://www.npmjs.com/package/@openzeppelin/defender-sdk
  - type: GitHubRepository
    url: https://github.com/OpenZeppelin/defender-sdk
  - type: ChangeLog
    url: https://docs.openzeppelin.com/defender
  - type: Plans
    url: plans/plans.yml
  - type: RateLimits
    url: rate-limits/rate-limits.yml
  - type: FinOps
    url: finops/finops.yml
  - type: Documentation
    url: https://docs.openzeppelin.com/relayer
  - type: OpenAPISpec
    url: https://raw.githubusercontent.com/api-evangelist/openzeppelin/main/openapi/openzeppelin-relayer-openapi.json
  - type: GitHubRepository
    url: https://github.com/OpenZeppelin/openzeppelin-relayer
  - type: SDKs
    url: https://github.com/OpenZeppelin/openzeppelin-relayer-sdk
  - type: Configuration
    url: https://docs.openzeppelin.com/relayer/configuration
- aid: openzeppelin:openzeppelin-notifications-api
  name: OpenZeppelin Notifications API
  description: Notifications are responsible for showing the notifications related to the relayers.
  humanURL: https://docs.openzeppelin.com/defender/sdk
  baseURL: https://defender-api.openzeppelin.com/v2
  tags:
  - Notifications
  properties:
  - type: OpenAPI
    url: openapi/openzeppelin-notifications-api-openapi.yml
  - type: Documentation
    url: https://docs.openzeppelin.com/defender/sdk
  - type: Authentication
    url: https://docs.openzeppelin.com/defender/settings
  - type: SDKs
    url: https://www.npmjs.com/package/@openzeppelin/defender-sdk
  - type: GitHubRepository
    url: https://github.com/OpenZeppelin/defender-sdk
  - type: ChangeLog
    url: https://docs.openzeppelin.com/defender
  - type: Plans
    url: plans/plans.yml
  - type: RateLimits
    url: rate-limits/rate-limits.yml
  - type: FinOps
    url: finops/finops.yml
  - type: Documentation
    url: https://docs.openzeppelin.com/relayer
  - type: OpenAPISpec
    url: https://raw.githubusercontent.com/api-evangelist/openzeppelin/main/openapi/openzeppelin-relayer-openapi.json
  - type: GitHubRepository
    url: https://github.com/OpenZeppelin/openzeppelin-relayer
  - type: SDKs
    url: https://github.com/OpenZeppelin/openzeppelin-relayer-sdk
  - type: Configuration
    url: https://docs.openzeppelin.com/relayer/configuration
- aid: openzeppelin:openzeppelin-plugins-api
  name: OpenZeppelin Plugins API
  description: Plugins are TypeScript functions that can be used to extend the OpenZeppelin Relayer API functionality.
  humanURL: https://docs.openzeppelin.com/defender/sdk
  baseURL: https://defender-api.openzeppelin.com/v2
  tags:
  - Plugins
  properties:
  - type: OpenAPI
    url: openapi/openzeppelin-plugins-api-openapi.yml
  - type: Documentation
    url: https://docs.openzeppelin.com/defender/sdk
  - type: Authentication
    url: https://docs.openzeppelin.com/defender/settings
  - type: SDKs
    url: https://www.npmjs.com/package/@openzeppelin/defender-sdk
  - type: GitHubRepository
    url: https://github.com/OpenZeppelin/defender-sdk
  - type: ChangeLog
    url: https://docs.openzeppelin.com/defender
  - type: Plans
    url: plans/plans.yml
  - type: RateLimits
    url: rate-limits/rate-limits.yml
  - type: FinOps
    url: finops/finops.yml
  - type: Documentation
    url: https://docs.openzeppelin.com/relayer
  - type: OpenAPISpec
    url: https://raw.githubusercontent.com/api-evangelist/openzeppelin/main/openapi/openzeppelin-relayer-openapi.json
  - type: GitHubRepository
    url: https://github.com/OpenZeppelin/openzeppelin-relayer
  - type: SDKs
    url: https://github.com/OpenZeppelin/openzeppelin-relayer-sdk
  - type: Configuration
    url: https://docs.openzeppelin.com/relayer/configuration
- aid: openzeppelin:openzeppelin-relayers-api
  name: OpenZeppelin Relayers API
  description: Relayers are the core components of the OpenZeppelin Relayer API. They are responsible for executing transactions
    on behalf of users and providing a secure and reliable way to interact with the blockchain.
  humanURL: https://docs.openzeppelin.com/defender/sdk
  baseURL: https://defender-api.openzeppelin.com/v2
  tags:
  - Relayers
  properties:
  - type: OpenAPI
    url: openapi/openzeppelin-relayers-api-openapi.yml
  - type: Documentation
    url: https://docs.openzeppelin.com/defender/sdk
  - type: Authentication
    url: https://docs.openzeppelin.com/defender/settings
  - type: SDKs
    url: https://www.npmjs.com/package/@openzeppelin/defender-sdk
  - type: GitHubRepository
    url: https://github.com/OpenZeppelin/defender-sdk
  - type: ChangeLog
    url: https://docs.openzeppelin.com/defender
  - type: Plans
    url: plans/plans.yml
  - type: RateLimits
    url: rate-limits/rate-limits.yml
  - type: FinOps
    url: finops/finops.yml
  - type: Documentation
    url: https://docs.openzeppelin.com/relayer
  - type: OpenAPISpec
    url: https://raw.githubusercontent.com/api-evangelist/openzeppelin/main/openapi/openzeppelin-relayer-openapi.json
  - type: GitHubRepository
    url: https://github.com/OpenZeppelin/openzeppelin-relayer
  - type: SDKs
    url: https://github.com/OpenZeppelin/openzeppelin-relayer-sdk
  - type: Configuration
    url: https://docs.openzeppelin.com/relayer/configuration
- aid: openzeppelin:openzeppelin-signers-api
  name: OpenZeppelin Signers API
  description: Signers are responsible for signing the transactions related to the relayers.
  humanURL: https://docs.openzeppelin.com/defender/sdk
  baseURL: https://defender-api.openzeppelin.com/v2
  tags:
  - Signers
  properties:
  - type: OpenAPI
    url: openapi/openzeppelin-signers-api-openapi.yml
  - type: Documentation
    url: https://docs.openzeppelin.com/defender/sdk
  - type: Authentication
    url: https://docs.openzeppelin.com/defender/settings
  - type: SDKs
    url: https://www.npmjs.com/package/@openzeppelin/defender-sdk
  - type: GitHubRepository
    url: https://github.com/OpenZeppelin/defender-sdk
  - type: ChangeLog
    url: https://docs.openzeppelin.com/defender
  - type: Plans
    url: plans/plans.yml
  - type: RateLimits
    url: rate-limits/rate-limits.yml
  - type: FinOps
    url: finops/finops.yml
  - type: Documentation
    url: https://docs.openzeppelin.com/relayer
  - type: OpenAPISpec
    url: https://raw.githubusercontent.com/api-evangelist/openzeppelin/main/openapi/openzeppelin-relayer-openapi.json
  - type: GitHubRepository
    url: https://github.com/OpenZeppelin/openzeppelin-relayer
  - type: SDKs
    url: https://github.com/OpenZeppelin/openzeppelin-relayer-sdk
  - type: Configuration
    url: https://docs.openzeppelin.com/relayer/configuration
common:
- type: AgenticAccess
  url: agentic-access/openzeppelin-agentic-access.yml
- type: TrustCenter
  url: security/openzeppelin-trust-center.yml
- type: DomainSecurity
  url: security/openzeppelin-domain-security.yml
- type: Authentication
  url: authentication/openzeppelin-authentication.yml
- type: Website
  url: https://www.openzeppelin.com/
- type: Documentation
  url: https://docs.openzeppelin.com/
- type: Forums
  url: https://forum.openzeppelin.com/
- type: GitHub
  url: https://github.com/OpenZeppelin
- type: Blog
  url: https://www.openzeppelin.com/blog
- type: News
  url: https://www.openzeppelin.com/news
- type: OpenSourceStack
  url: https://www.openzeppelin.com/open-source-stack
- type: Security
  url: https://www.openzeppelin.com/security-audits
- type: Twitter
  url: https://twitter.com/OpenZeppelin
- type: Discord
  url: https://discord.openzeppelin.com/
- type: LinkedIn
  url: https://www.linkedin.com/company/openzeppelin/
- type: TermsOfService
  url: https://www.openzeppelin.com/tos
- type: PrivacyPolicy
  url: https://www.openzeppelin.com/privacy
- type: Status
  url: https://status.openzeppelin.com/
- type: Signup
  url: https://defender.openzeppelin.com/
maintainers:
- FN: API Evangelist
  url: https://apievangelist.com
  email: info@apievangelist.com