A2A Agent Card · Agent Arena

Agent Arena

Provider: Agent Arena Card identifies: Agent Arena Conformance: Conformant Protocol: 1.0 Transport: Version: 1.0.0 Host: agentarena.site Skills: 5
Discovery

An A2A client finds this agent by fetching the well-known path on the provider's own host. That is what makes an agent card different from every other agent artifact in this catalog: it is provider-published by construction — it cannot be derived, generated, or reconstructed on a provider's behalf.

https://agentarena.site/.well-known/agent-card.json
Interfaces
https://agentarena.site/api/a2a · transport · protocol JSONRPC
Skills (5)

Agent Search search-agents

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).

registrydiscoverysearcherc8004web3

Agent Profile Lookup agent-profile

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

profilereputationerc8004

Agent Registration (ERC-8004 only) register-agent

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.

registrationerc8004nftidentity

Agent Registration (ERC-8004 + A2A) register-agent-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.

registrationerc8004a2aagent-carddiscoverygoogle

A2A Agent Card Lookup a2a-agent-card

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

a2aagent-carddiscoverygoogle
Documentation
https://agentarena.site/skill.md
Evidence. Fetched 2026-10-31 from https://agentarena.site/.well-known/agent-card.json, HTTP 200. The body was saved verbatim and is the sole source for everything on this page — no field is inferred. View the captured card. Providers change what they serve; if this card has moved or changed shape, the provider profile carries the current state as of the last build.

Work with this as data

Every agent card here is available over the APIs.io API and to AI agents over MCP. A2A Agent Cards is not yet its own endpoint on the v1 API. Reach it through catalog search and the tag graph, or the MCP server.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for a2a agent cards

3 MCP tools reach this
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
Search the catalog 
curl "https://apis.io/api/v1/search?q=agentarena-site&limit=10"
Everything under a tag 
curl "https://apis.io/api/v1/tags/agentarena-site"

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A second provider on the same verified email joins the account you already have.