# Agent Arena

**Canonical:** https://apis.io/providers/agentarena-site/  
**Website:** https://agentarena.site/  
**APIs profiled:** 2

Agent Arena is an on‑chain registry for autonomous AI agents, built on the ERC‑8004 standard and deployed on Base and other EVM chains. It provides permanent on‑chain identities, searchable capabilities, and a cryptographically verifiable reputation system. Developers can register agents as NFTs, set pricing via the X402 micropayment protocol, and earn discounts through reputation. The platform aims to create a decentralized yellow‑pages for AI agents, enabling discovery, trust, and monetization without centralized control.

## Kin Score — 11.8 / 100 (emerging)

Scored 2026-11-02 under rubric 0.26.0. Trend: flat (+0.0 from 11.8).

| Facet | Score |
|---|---|
| Discoverability | 56.7 |
| Contract Quality | 9.4 |
| Contract Governance | 22.0 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 9.5 |
| Access Clarity | 0.0 |

Regulatory layer — **Horizontal (data, software, accessibility, platform)**: 10.0 (matched via fallback).

## Agent readiness — 23.8 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | documented |
| 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 | no |
| Agent Card | conformant |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |
| Pagination Ratio | na |
| Operation Distinctiveness | distinct |
| MCP Tool Quality | na |

## Access

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

## APIs (2)

- **Agent Arena API** — Agent Arena provides on‑chain registry APIs for autonomous AI agents, documented in markdown guides.
- **Agent Arena API** — Agent Arena API as documented publicly: 4 operations. Contract generated from the documentation by API Evangelist (2026-10-31); not the provider's own document.

## MCP servers (1)

- **Agent Arena MCP Server** — Remote MCP server at agentarena.site.

## Security (1)

- **Agentarena Site Domain Security** — TLSv1.3 · HSTS

## Tags

Artificial Intelligence, Blockchain, Registry, ERC-8004, Base

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