Code4rena

Code4rena (C4) is a competitive smart-contract security auditing platform that connects Web3/DeFi projects (sponsors) with a global community of security researchers (wardens) through time-boxed competitive audits and ongoing bug bounties. Sponsors fund an audit, wardens compete to surface vulnerabilities, and judges rate severity, validity, and quality to distribute awards via a ranked-curve incentive model. Over five years the platform ran 512+ audits, engaged 16,600+ researchers, and surfaced 26,898 findings including 1,607 high-severity vulnerabilities. Code4rena announced it is winding down operations, seeing active competitions and bounties through to completion. This API Evangelist profile was surfaced as a paradigm portfolio company; the platform is web/app-based with GitBook documentation and does not publish a public REST/GraphQL API, SDK, or developer portal.

Code4rena is profiled on the APIs.io network. Tagged areas include Company, Security, Smart Contracts, Web3, and DeFi.

Code4rena’s developer surface includes documentation, getting-started guide, support, and 10 more developer resources.

🌐 Visit website 📡 Source on GitHub

17.8/100 emerging ▬ flat Agent 7/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5

0 APIs

CompanySecuritySmart ContractsWeb3DeFiAuditingBug BountyBlockchain

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 17.8/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 4.8 / 20

Commercial Clarity 4.2 / 20

Operational Transparency 2.1 / 13

Governance 0.0 / 12

Discoverability 6.8 / 10

Agent readiness — 7/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 15

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 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 3 / 3

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/code4rena: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

LLMsTxt

LLMsTxt

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 4

Authentication, authorization, and security posture

Security

Security

SecurityTxt

SecurityTxt

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

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: code4rena
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/code4rena.png
name: Code4rena
description: Code4rena (C4) is a competitive smart-contract security auditing platform that connects Web3/DeFi projects (sponsors)
  with a global community of security researchers (wardens) through time-boxed competitive audits and ongoing bug bounties.
  Sponsors fund an audit, wardens compete to surface vulnerabilities, and judges rate severity, validity, and quality to distribute
  awards via a ranked-curve incentive model. Over five years the platform ran 512+ audits, engaged 16,600+ researchers, and
  surfaced 26,898 findings including 1,607 high-severity vulnerabilities. Code4rena announced it is winding down operations,
  seeing active competitions and bounties through to completion. This API Evangelist profile was surfaced as a paradigm portfolio
  company; the platform is web/app-based with GitBook documentation and does not publish a public REST/GraphQL API, SDK, or
  developer portal.
url: https://raw.githubusercontent.com/api-evangelist/code4rena/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- paradigm
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-18'
tags:
- Company
- Security
- Smart Contracts
- Web3
- DeFi
- Auditing
- Bug Bounty
- Blockchain
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://code4rena.com
- type: Documentation
  url: https://docs.code4rena.com
- type: GettingStarted
  url: https://docs.code4rena.com/getting-started
- type: Support
  url: https://code4rena.com/help
- type: GitHubOrganization
  url: https://github.com/code-423n4
- type: TermsOfService
  url: https://docs.code4rena.com/legal/terms-of-service
- type: PrivacyPolicy
  url: https://docs.code4rena.com/legal/privacy-policy
- type: Security
  url: https://code4rena.com/.well-known/security.txt
- type: SecurityTxt
  url: well-known/code4rena-security.txt
- type: WellKnown
  url: well-known/code4rena-well-known.yml
- type: LLMsTxt
  url: llms/code4rena-llms.txt
- type: VulnerabilityDisclosure
  url: security/code4rena-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/code4rena-domain-security.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence