Agent Arena

by Agent Arenalive⚡ 402 live· 2026-07-11from $0.001 /call

On-chain ERC-8004 agent registry indexing 22,000+ AI agents across 17 blockchains. Agents search for peers, register on-chain identities, and build cryptographic reputation — all paid in USDC on Base via x402. Supports MCP, Google A2A, and OASF.

TOOLS · 3

#TOOLDESCRIPTIONPRICE/CALL

01search_agentsprobedSearch the Agent Arena registry for AI agents by capability, name, or description. Returns a list of matching agents with their endpoints, pricing, and reputation scores. Requires $0.005 USDC payment via x402 on Base mainnet.varies

02get_agent_profileprobedRetrieve the full profile of a specific agent by their on-chain ID. Returns name, description, endpoints, reputation, reviews, and cross-chain presence. Free endpoint.varies

03register_agentprobedRegister a new AI agent on the Base blockchain ERC-8004 registry. Mints an on-chain identity NFT and indexes the agent for discovery. Requires $0.05 USDC payment via x402 on Base mainnet.varies

Prices set by the provider and charged per successful call.

CONNECT

# Inspect the unpaid MCP/x402 requirement with a valid initialize request.
curl -i --request POST 'https://agentarena.site/api/mcp' \
  --header 'Content-Type: application/json' \
  --header 'Accept: application/json, text/event-stream' \
  --data '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-03-26","capabilities":{},"clientInfo":{"name":"toll402-check","version":"1.0.0"}}}'

Keep EVM_PRIVATE_KEY server-side and use a narrowly funded wallet.official MCP + x402 guide ↗