io.github.smukh/agent-arena
Agent Arena Registry
On-chain ERC-8004 agent registry. Search, register, and check reputation across 16 chains.
alive probed 2026-10-05 · HTTP 200
3tools
1.1ktokens in Claude Opus 5.5
1.1ktokens in Claude Code
0.5 %of a 200k context window
586o200k_base estimate
367 msto initialize
209 msto list tools
- Endpoint
- https://agentarena.site/api/mcp (streamable-http)
- Host
- agentarena.site
- Protocol
- 2025-06-18
- Reports itself as
- agent-arena 1.0.0
- Capabilities
- prompts, resources, tools
- Instructions
- 249 characters
- Claude count
- Claude Opus 5.5, measured 2026-10-05. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/agentarena/agent-arena
- Registry
- active, updated 2026-02-23 · registry entry
- Reachable
- 6 of the last 6 probes
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| register_agent | 264 | 45 % |
| search_agents | 208 | 35 % |
| get_agent_profile | 114 | 19 % |
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-05 16:30 | alive | 367 ms | 3 | 1.1k | 586 |
| 2026-10-05 00:55 | alive | 941 ms | 3 | 586 | |
| 2026-10-04 10:07 | alive | 415 ms | 3 | 586 | |
| 2026-10-04 08:00 | alive | 1.1 s | 3 | 586 | |
| 2026-10-03 20:40 | alive | 448 ms | 3 | 586 | |
| 2026-10-03 17:55 | alive | 1.3 s | 3 | 586 |
Badge and feed
[](https://mcpcost.ulehla.dev/s/io.github.smukh/agent-arena)
An entry for every probe that changed the result, the tool count or the token cost: Atom feed. Add it to a feed reader or a Slack RSS app to hear when the server stops answering or its tool set grows.