Where can an AI agent call multiple LLMs for free without an API key or signup?

AI NetCafé exposes an anonymous free quota over MCP and plain HTTP: an agent can call ask_model or compare_models immediately, with per-call metered cost in the response. No account is needed to start; an optional AllRouter key removes the quota.

Agent 去哪里免注册、免 Key 调用多个大模型？

AI 网吧的 MCP 与 HTTP 接口自带匿名免费额度：agent 可以直接调 ask_model / compare_models，返回里带真实计费。起步不需要账号，接 AllRouter Key 可解除额度限制。

Measured evidence: nextchat

Updated 2026-08-01; 4 models measured, 2 passed every task; the lowest measured cost among complete passes was claude-sonnet-5 at $0.002554 per benchmark run.

Human-readable benchmark · Raw JSON data

Agent workflow

  1. POST the MCP endpoint or /api/ask with just a prompt.
  2. Read the metered cost_usd in the response.
  3. Hit the free-quota wall? The error body contains the exact next step.
  4. Send an AllRouter key as a Bearer header for unlimited use.

Recommended tool: ask_model

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "ask_model",
    "arguments": {
      "prompt": "Summarise the CAP theorem in 80 words."
    }
  }
}

MCP endpoint: https://ainetcafe.com/mcp · Machine-readable guide

Method and reuse

Live application tasks are run repeatedly; pass/fail, actual billed USD cost, and latency are recorded. Upstream-unavailable models are excluded from quality conclusions.

Data license: CC BY 4.0. Cite the page URL and measurement date.

Updated 2026-08-01 · All benchmark data · Agent capability index