# Code4rena

**Canonical:** https://apis.io/providers/code4rena/  
**Website:** https://code4rena.com  
**APIs profiled:** 0

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.

## Kin Score — 17.3 / 100 (emerging)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+1.1 from 16.2).

| Facet | Score |
|---|---|
| Discoverability | 68.5 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 7.9 |
| Developer Ergonomics | 26.2 |
| Commercial Clarity | 21.1 |
| Access Clarity | 21.1 |

## Agent readiness — 2.6 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | yes |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## Security (2)

- **Code4Rena Domain Security** — TLSv1.3 · HSTS · DMARC
- **Code4Rena Vulnerability Disclosure** — security.txt · contact published

## Tags

Company, Security, Smart Contracts, Web3, DeFi, Auditing, Bug Bounty, Blockchain

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/code4rena/). Scores are computed from the provider's own public artifacts under a published rubric.